Journal articles on the topic 'Mixed analogue digital integrate circuit'

Electronic circuits form the basis of much of the technology we use today. Professor Haruo Kobayashi and Assistant Professor Anna Kuwana, Division of Electronics and Informatics, Gunma University, Japan, are utilising classical mathematics, including theorems such as number theory and control theory in their design of circuits that contain elements of analogue signalling. Analogue circuit planning is regarded as an art as these circuits are typically designed based on mature designers' intuition and experiences in a process that is less systematic for coming up with new architectures and more designing than digital circuit design and Kobayashi and Kuwana firmly believe that 'beautiful' mathematics can facilitate truly great circuit design. Additional mathematics techniques employed by Kobayashi and the team are statistics, coding theory, modulation and signal processing algorithms and pairing pure mathematics theorems with electrical engineering is a key feature of the researchers' work. The team utilises theoretical analysis and simulations such as the circuit simulator (SPICE) and system simulator (MATLAB) to test its work and collaborates with semiconductor companies and electronic measurement instrument companies in Japan for smart circuit design and effective circuit testing. So far, results include that using SAR ADC configurations with Fibonacci sequence weights can improve the speeds and reliability of the SAR ADC. Also several new DAC architecutures and waveform sampling methods are derived based on mathematics.

A need for high temperature integrated circuits is emerging in a number of application areas. As Silicon Carbide power discrete devices become more widely available, there is a growing need for control ICs capable of operating at the same temperatures and mounted on the same modules. Also, the use of high temperature sensors, in, for example, aero engines and in deep hydrocarbon and geothermal drilling applications results in a demand for high temperature sensor interface ICs. This paper presents new results on a range of simple logic and analogue circuits fabricated on a developing Silicon Carbide CMOS process which is intended for mixed signal integrated circuit applications such as those above. A small family of logic circuits, pin compatible with the 74xx series TTL logic parts, has been designed, fabricated and tested and includes, for example, a Quad Nand gate and a Dual D-type flip-flop. These have been found to be functional from room temperature up to 400°C. Analogue blocks have been investigated with a view to using switched capacitor or autozero techniques to compensate for temperature and time induced drifts, allowing very high temperature operation.

Neuromorphic hardware is the term used to describe full custom–designed integrated circuits, or silicon ‘chips’, that are the product of neuromorphic engineering—a methodology for the synthesis of biologically inspired elements and systems, such as individual neurons, retinae, cochleas, oculomotor systems and central pattern generators. We focus on the implementation of neurons and networks of neurons, designed to illuminate structure–function relationships. Neuromorphic hardware can be constructed with either digital or analogue circuitry or with mixed–signal circuitry—a hybrid of the two. Currently, most examples of this type of hardware are constructed using analogue circuits, in complementary metal–oxide–semiconductor technology. The correspondence between these circuits and neurons, or networks of neurons, can exist at a number of levels. At the lowest level, this correspondence is between membrane ion channels and field–effect transistors. At higher levels, the correspondence is between whole conductances and firing behaviour, and filters and amplifiers, devices found in conventional integrated circuit design. Similarly, neuromorphic engineers can choose to design Hodgkin–Huxley model neurons, or reduced models, such as integrate–and–fire neurons. In addition to the choice of level, there is also choice within the design technique itself; for example, resistive and capacitive properties of the neuronal membrane can be constructed with extrinsic devices, or using the intrinsic properties of the materials from which the transistors themselves are composed. So, silicon neurons can be built, with dendritic, somatic and axonal structures, and endowed with ionic, synaptic and morphological properties. Examples of the structure–function relationships already explored using neuromorphic hardware include correlation detection and direction selectivity. Establishing a database for this hardware is valuable for two reasons: first, independently of neuroscientific motivations, the field of neuromorphic engineering would benefit greatly from a resource in which circuit designs could be stored in a form appropriate for reuse and re–fabrication. Analogue designers would benefit particularly from such a database, as there are no equivalents to the algorithmic design methods available to designers of digital circuits. Second, and more importantly for the purpose of this theme issue, is the possibility of a database of silicon neuron designs replicating specific neuronal types and morphologies. In the future, it may be possible to use an automated process to translate morphometric data directly into circuit design compatible formats. The question that needs to be addressed is: what could a neuromorphic hardware database contribute to the wider neuroscientific community that a conventional database could not? One answer is that neuromorphic hardware is expected to provide analogue sensory–motor systems for interfacing the computational power of symbolic, digital systems with the external, analogue environment. It is also expected to contribute to ongoing work in neural–silicon interfaces and prosthetics. Finally, there is a possibility that the use of evolving circuits, using reconfigurable hardware and genetic algorithms, will create an explosion in the number of designs available to the neuroscience community. All this creates the need for a database to be established, and it would be advantageous to set about this while the field is relatively young. This paper outlines a framework for the construction of a neuromorphic hardware database, for use in the biological exploration of structure–function relationships.

Silicon Carbide devices are capable of operating as a semiconductor at high temperatures and this capability is being exploited today in discrete power components, bringing system advantages such as reduced cooling requirements [1]. Therefore there is an emerging need for control ICs mounted on the same modules and being capable of operating at the same temperatures. In addition, several application areas are pushing electronics to higher temperatures, particularly sensors and interface devices required for aero engines and in deep hydrocarbon and geothermal drilling. This paper discusses a developing CMOS manufacturing process using a 4H SiC substrate, which has been used to fabricate a range of simple logic and analogue circuits and is intended for power control and mixed signal sensor interface applications [2]. Test circuits have been found to operate at up to 400°C. The introduction of a floating capacitor structure to the process allows the use of switched capacitor techniques in mixed signal circuits operating over an extended temperature range.

In this paper the authors discuss the issues related to the self-awareness of high-resolution, mixed-signal circuits and systems, based on S-? ADC, which is the most important and sensitive module and the key element for analogue to digital conversion. The basic methodology and framework for improving the self-awareness of such systems are presented. The methodology is based on efficient real-time measurements of a high-resolution, mixed-signal system using pseudo random signal source, real-time calculation of a distance between responses, the possibility to adapt measured circuit to minimize the distance, and changing the parameters of a reference system according to learning rules. The use of pseudo-random noise as a signal source leads to efficient and cost-effective measurements that run in parallel to the main signal processing. The calculation of the distance between the system and its reference are theoretically analysed and verified using Matlab model. The response of a system together with the response of high precision analogue to digital converter (ADC) is compared to the response of a bit-true model of a reference digital circuit. The differences are calculated using simple area-efficient cross-correlation algorithm. Together with adaptation strategy and tuning circuitry it forms the basis for self-awareness of mixed-signal circuits.

Abstract In this paper we review high-speed radio-frequency integrated circuits operating up to 210 GHz and present selected state-of-the-art circuits with leading-edge performance, which we have designed at our chair. The following components are discussed employing bipolar complementary metal oxide semiconductors (BiCMOS) technologies: a 200 GHz amplifier with 17 dB gain and around 9 dB noise figure consuming only 18 mW, a 200 GHz down mixer with 5.5 dB conversion gain and 40 mW power consumption, a 190 GHz receiver with 47 dB conversion gain and 11 dB noise figure and a 60 GHz power amplifier with 24.5 dBm output power and 12.9 % power added efficiency (PAE). Moreover, we report on a single-core flash CMOS analogue-to-digital converter (ADC) with 3 bit resolution and a speed of 24 GS/s. Finally, we discuss a 60 GHz on-off keying (OOK) BiCMOS transceiver chip set. The wireless transmission of data with 5 Gb/s at 42 cm distance between transmitter and receiver was verified by experiments. The complete transceiver consumes 396 mW.

This paper applies the time-domain testing technique and compares the effectiveness of transient voltage and dynamic power supply current measurements in detecting faults in CMOS mixed-signal circuits. The voltage and supply current (iDDT) measurements are analyzed by three methods to detect the presence of a fault, and to establish which measurement achieves higher confidence in the detection. Catastrophic, soft and stuck-at single fault conditions were introduced to the circuit-under-test (CUT). The time-domain technique tests a mixed-signal CUT in a unified fashion, thereby eliminating the need to partition the CUT into separate analogue and digital modules.

A digitally programmable analog Fuzzy Logic Controller (FLC) is presented. Input and output signals are processed in the analog domain whereas the parameters of the controller are stored in a built-in digital memory. Some new functional blocks have been designed whereas others were improved towards the optimization of the power consumption, the speed and the modularity while keeping a reasonable accuracy, as it is needed in several analogue signal processing applications. A nine-rules, two-inputs and one-output prototype was fabricated and successfully tested using a standard CMOS 2.4μ technology, showing good agreement with the expected performances, namely: a 2.7% RMSE, from 2.22 to 5.26 Mflips (Mega fuzzy logic inferences per second) at the pin terminals (@CL=13pF), 933 μW power consumption per rule (@Vdd=5V) and 5 bits of resolution. Since the circuit is intended for a subsystem embedded in an application chip (@CL≤ 5pF) up to 8 Mflips may be expected.

A low-cost signal processing circuit developed to measure and drive a heat dissipation soil matric potential sensor based on a single thermosensitive resistor is demonstrated. The SnSe2 has a high thermal coefficient, from −2.4Ω/°C in the 20 to 25 °C to −1.07Ω/°C in the 20 to 25 °C. The SnSe2 thermosensitive resistor is encapsulated with a porous gypsum block and is used as both the heating and temperature sensing element. To control the power dissipated on the thermosensitive resistor and keep it constant during the heat pulse, a mixed analogue/digital circuit is used. The developed control circuit is able to maintain the dissipated power at 327.98±0.3% mW when the resistor changes from 94.96Ω to 86.23Ω. When the gravimetric water content of the porous block changes from dry to saturated (θw=36.7%), we measured a variation of 4.77Ω in the thermosensitive resistor, which results in an end-point sensitivity of 130 mΩ/%. The developed system can easily meet the standard requirement of measuring the gravimetric soil water content with a resolution of approximately Δθw=1%, since the resistance is measured with a resolution of approximately μ31μΩ, three orders of magnitude smaller than the sensitivity.

This essay sets out a new method for the history of ideas. Using a mixed approach combining computer assisted reading methods with more traditional close reading, the essay tracks the evolution of a set of terms over the eighteenth century that have become central to how we think about government in particular and political concepts in general. The essay is offered as an example of how data mining very large digital archives allows us to see trends and patterns that are invisible at the granular level of human scale reading, and it proposes that these largescale observations can both complement and complicate our hitherto analogue histories of ideas. The findings of this mixed approach indicate that ‘despotism’ functioned as a type of gate in an electronic circuit, sometimes allowing the connection to liberty and government and on others blocking those connections. Most significantly ‘despotism’ is shown to be an essential ingredient in the conceptual foundations of a theory of rights, liberty and government in the period and that this structure underpins contemporary theories of government.

Abstract Spiking neurons communicate with other neurons using sparse and binary signals in a human brain, so they can achieve real-time processing of the information with ultra-low power consumption[1,2]. Thereby, spiking neurons are essential elements for building an energy-efficient biomimetic spatiotemporal system. Recently, to emulate the behavior of biological neuron, many researches for memristive device-based neurons with peripheral circuits (i.e., sense-amplifier or reset circuit)[3] and complementary metal-oxide-semiconductor (CMOS) neurons with capacitors have been reported[4]. Most of the reported memristive device-based neurons required a high operation voltage (>1.2 V) for emulating integrate function of a biological neuron. In addition, complementary metal-oxide-semiconductor-based neurons could not achieve high neuronal density due to using a capacitor in emulating integrate function. In this study, therefore, we propose an electrochemical metallization cell based memristive neuron chip fabricated with 28-nm CMOS process having a low operation voltage (<0.7 V) for emulating integrate function. In addition, since the proposed electrochemical metallization cell based memristive neuron chip does not require a capacitor for emulating integrate function, it can realize a high neuronal density. The memristive neuron chip exhibited a typical integrate-and-fire function; particularly, the frequency of generating a spiking output signal exponentially increased with the input voltage amplitude. Moreover, a spiking neural network was designed using the memristive neuron chip and the software program consisting of a crossbar synaptic memristor array, simplified spike-timing-dependent-plasticity learning rule, and current-to-voltage converters. Using the co-designed spiking neural network with software and hardware, real-time unsupervised learning was realized. Finally, using the trained spiking neural network, a real-time classification for the MNIST hand-written image taken by a live webcam was successfully performed in an inference process. Acknowledgement This research was supported by National R&D Program through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT(2021M3F3A2A01037733). Reference Mead, C. Neuromorphic Electronic Systems. Encycl. Comput. Neurosci. 78, 1979–1979 (2015). Douglas, R. Neuromorphic Analogue VLSI. Annu. Rev. Neurosci. 18, 255–281 (1995). Tuma, T., Pantazi, A., Le Gallo, M., Sebastian, A. & Eleftheriou, E. Stochastic phase-change neurons. Nat. Nanotechnol. 11, 693–699 (2016). Aamir, S. A., Müller, P., Hartel, A., Schemmel, J. & Meier, K. A highly tunable 65-nm CMOS LIF neuron for a large scale neuromorphic system. Eur. Solid-State Circuits Conf. 2016-Octob, 71–74 (2016). Figure 1

Advances in silicon technology continue to revolutionize micro-/nano-electronics. However, Si cannot do everything, and devices/components based on other materials systems are required. What is the best way to integrate these dissimilar materials and to enhance the capabilities of Si, thereby continuing the micro-/nano-electronics revolution? In this paper, I review different approaches to heterogeneously integrate dissimilar materials with Si complementary metal oxide semiconductor (CMOS) technology. In particular, I summarize results on the successful integration of III–V electronic devices (InP heterojunction bipolar transistors (HBTs) and GaN high-electron-mobility transistors (HEMTs)) with Si CMOS on a common silicon-based wafer using an integration/fabrication process similar to a SiGe BiCMOS process (BiCMOS integrates bipolar junction and CMOS transistors). Our III–V BiCMOS process has been scaled to 200 mm diameter wafers for integration with scaled CMOS and used to fabricate radio-frequency (RF) and mixed signals circuits with on-chip digital control/calibration. I also show that RF microelectromechanical systems (MEMS) can be integrated onto this platform to create tunable or reconfigurable circuits. Thus, heterogeneous integration of III–V devices, MEMS and other dissimilar materials with Si CMOS enables a new class of high-performance integrated circuits that enhance the capabilities of existing systems, enable new circuit architectures and facilitate the continued proliferation of low-cost micro-/nano-electronics for a wide range of applications.

D-band (110-170GHz) spectrum is gaining attention for various applications, including 6G mm-Wave, sub-THz sensing, and radar. These systems require lattice spacing for antenna elements at sub-1mm and a very low loss signal path from antenna to integrated chip. A highly efficient front-end in a very small form factor will be required for these systems. This drives the requirement for a monolithically integrated high-gain, high-efficiency front-end that also leverages the benefits of a high-speed / high-density digital CMOS. Silicon germanium (SiGe) heterojunction bipolar transistors (HBT) integrated along with a high-density CMOS provide such an all-silicon monolithic solution. The US government is fostering the expansion of “unique and differentiated domestic manufacturing” with funding through DARPA’s Technologies for Mixed-mode Ultra Scaled Integrated Circuits (T-MUSIC) [1] program to enable disruptive RF mixed-mode technologies by developing high performance RF analog integrated with advanced digital CMOS. Through the T-MUSIC program, DARPA seeks to: 1) advance RF and mixed-mode devices to support ultra-wideband RF frontends from HF to 100 GHz; 2) integrate those devices with high density digital CMOS electronics at the wafer scale to enable embedded digital intelligence; 3) develop and explore ultra-high resolution broadband mixed-mode circuit building blocks for DoD-relevant applications; 4) explore innovative device topologies and materials to form THz devices in an advanced digital CMOS fabrication platform; and 5) establish a domestic ecosystem that facilitates enduring DoD access to differentiated capabilities for high performance RF mixed-mode SoCs. Under T-MUSIC, GlobalFoundries is demonstrating BiCMOS on 45nm PDSOI, which is the focus of this paper, and 22nm FDSOI CMOS with goals of increasing HBT performance of fT/fMAX from 350/500 GHz to 400/600 GHz and 600/700 GHz. HBTs with fT/fMAX of 380/550GHz GHz have been demonstrated building upon previously published results [2]. This paper will touch on some of the challenges that were encountered in achieving that result and discuss those anticipated in future work. Achieving these results required scaling transistor dimensions. Vertical scaling of the emitter, base and collector layers, with higher doping concentrations, reduces transit time but results in higher current densities and higher electric fields. Lateral scaling of the transistor structure reduces parasitic capacitance and resistance but concentrate the power dissipation in a smaller area. The thermal conductivity of silicon is 148W/m-K whereas that of silicon dioxide is ~1.4W/m-K. Even a thin layer of oxide will significantly increase the self-heating of the HBT. Therefore, we replace the SOI with coplanar epitaxy in regions where the HBTs are formed. The vertical scaling of the HBT requires limiting the thermal cycles that the HBT will experience during processing and suggests forming the HBT as late as possible in the CMOS process. However, the thermal cycles associate with the epitaxy and film depositions to form the HBT impact the CMOS transistors which suggests forming the HBT early in the process. We found a point in the process that offers the best compromise minimizing the impact to the doped-channel PDSOI CMOS while achieving the HBT performance goals. Work is just beginning on integration tradeoffs for FDSOI with metal gate and high-K dielectrics. Advanced-node CMOS processes can form components having smaller dimensions which offers advantages for lateral scaling but also presents challenges for forming the HBT. The contact height in 45nm is significantly less than the height of the HBT structure used in GF’s 9HP process. We changed the formation of the emitter and base so that the emitter and base contacts are almost coplanar in contrast to 9HP where the emitter was almost twice the height of the base. This problem is being further exasperated as we migrate to 22nm. The shrinking of BEOL wiring dimensions, along with the ability of the HBT to drive high currents, presents challenges in designing within limits imposed by electromigration. The use of wider wires is constrained by metal density rules. The use of stacked metal levels and redundant vias impact the parasitic capacitances and resistances of the interconnects. The paper and presentation will review these, and other challenges encountered in achieving BiCMOS integration of SiGe HBTs with fT/fMAX of 380/550GHz GHz [see figure] on a 45nm PDSOI CMOS and touch future work. This research was developed with funding from the Defense Advanced Research Projects Agency (DARPA) and is Approved for Public Release, Distribution Unlimited. The views, opinions and/or findings expressed are those of the author and should not be interpreted as representing the official views or policies of the Department of Defense or the U.S. Government. [1] https://www.darpa.mil/attachments/T-MUSIC_Proposers%20Day_Presentations_Combined.pdf [2] J. Pekarik et al., 2021 IEEE BCICTS, 2021, pp. 1-4, Figure 1

Aim:: Current comparators are useful in many analog circuits and communication systems. The increasing demand to integrate wearable health monitoring systems in telemedicine and biomedical applications that helps in early detection of abnormal conditions in patients, comparator is one of its core. Objective:: Wearable and implantable medical devices work primarily on signal acquisition and wireless transmission. In signal acquisition, analogue to digital converter (ADC) is the prime module. Conversion is done using the sampling process and samples are generated by comparing the input signal with the threshold level. For this purpose, comparator circuits are more preferable. This manuscript presents a novel dual output comparator design by using carbon nanotube field effect transistor second generation current controlled conveyor (CNCCCII). This CNCCCII is realized with the present day technology called carbon nanotube field effect transistors (CNFETs). Methods/Results:: The proposed comparator topology is designed with 32 nm CNFET technology files with a supply voltage of ±0.9 V using Cadence Virtuoso simulator tool. The performance of the proposed design is tested using transient analysis, Montecarlo analysis, temperature sweep, and finally compared with the existing models. Conclusion:: The proposed comparator has the advantage of requiring single CNCCCII with only one resistor and is preferable for monolithic IC fabrication. The proposed circuit implemented using CNFETs gives a substantial improvement in supply voltage requirement and less variation in output voltage levels over the existing technologies.

STEM and STEAM education promotes the integration between science, technology, engineering, mathematics, and the arts. The latter aims at favoring deep and collaborative learning on students, through curricular integration in K-12 science education. The enactive and ecological psychology approach to education puts attention on the role of the teacher, learning context and socio-cultural environment in shaping lived learning experiences. The approach describes education as a process of embodied cognitive assemblage of guided perception and action. The latter process depends on the interaction of learners with digital and/or analogue learning affordances existing within the socio-technological environment. This article proposes that the scope of an enactive-ecological approach can be extended to the domain of learning science, technology, engineering, arts, and mathematics (STEAM), especially when it comes to understanding deep roots of the learning process. We first present an exhaustive literature review regarding the foundations of both the enactive and the ecological learning theories, along with their differences and key similarities. We then describe the fundamentals and latest research advances of an integrated STEAM pedagogy, followed by the notion of mixed reality (XR) as an emerging educational technology approach, offering an understanding of its current foundations and general disposition on how to understand digital immersion from ecological psychology. Next, we propose a systems theoretical approach to integrate the enactive-ecological approach in STEAM pedagogy, framed in the Santiago school of cognition attending to the interactive dynamics occurring between learners and their interaction with learning affordances existing within their educational medium, establishing that sensorimotor contingencies and attentional anchors are important to restrict sensory variety and stabilize learning concepts. Finally, we consider two empirical studies, one from Chile and the other from New Zealand, in which we demonstrate how the enactive-ecological approach built upon a systems theory perspective can contribute to understanding the roots of STEAM learning and inform its learning design.

Longing on a large scale is what makes history.Don DeLillo, UnderworldIntroductionWhile the media industries have been rather thoroughly dissected for their capacity to generate enthusiasm through well-honed practices of marketing and patterns of consumerism, any analysis of the shift underway to capture and modulate the ‘enthusiastic’ and affective labour of media industry practitioners themselves may still have much to learn by reaching back to the long tradition in Western philosophy: a tradition, starting with the Greeks that has almost always contrasted enthusiasm with reason (Heyd). To quote Hume: “Hope, pride, presumption, a warm imagination, together with ignorance, are … the true sources of enthusiasm” (73). Hume’s remarks are contextualised in protestant theological debates of the 18th century, where enthusiasm was a term for a religious practice, in which God possesses the believer. Especially English preachers and theologians were putting considerable energy into demonising this far too ecstatic form of belief in god (Heyd). This ambivalent attitude towards enthusiasm time-travels from the Greeks and the Enlightenment period straight into the 20th century. In 1929, William Henry Schoenau, an early author of self-help literature for the white-collar worker, aimed to gain a wider audience with the title: “Charm, Enthusiasm and Originality - their Acquisition and Use”. According to him, enthusiasm is necessary for the success of the salesman, and has to be generated by techniques such as a rigorous special diet and physical exercises of his facial muscles. But it also has to be controlled:Enthusiasm, when controlled by subtle repression, results in either élan, originality, magnetism, charm or “IT”, depending on the manner of its use. Uncontrolled enthusiasm results in blaring jazz, fanaticism and recklessness. A complete lack of enthusiasm produces the obsequious waiter and the uneducated street car conductor. (7)Though William Henry Schoenau got rather lost in his somewhat esoteric take on enthusiasm – for him it was a result of magnetic and electric currents – we argue that Schoenau had a point: Enthusiasm is a necessary affect in many forms of work, and especially so in the creative industries. It has to be generated, it sometimes has to be enacted, and it has also to be controlled. However, we disagree with Schoenau in one important issue: For us, enthusiasm can only be controlled up to a certain degree. Enthusiasm in the Creative IndustriesSchoenau wrote for an audience of salesmen and ambitious managers. This was simultaneous with the rise of Fordism. Most labour in Fordism was routine labour with the assembly line as its iconic representation. In mass-production itself, enthusiasm was not needed, often not even wanted. Henry Ford himself noted dryly: “Why do I get a human being when all I want is a pair of hands” (Kane 128). It was reserved for few occupational groups situated around the core of the mass-produced economy, such as salesmen, inventors, and leaders like him. “Henry Ford had a burning enthusiasm for the motor car” (Pearle 196).In industrial capitalism enthusiasm on a larger scale was not for the masses. It could be found in political movements, but hardly in the realm of work. This was different in the first socialist state. In the 1920s and 1930s Soviet Union the leaders turned their experience in stimulating a revolutionary mindset into a formula for industrial development – famously documented in Dziga Vertov’s “Enthusiasm. Symphony of the Donbass”.In capitalist countries things changed with the crisis of Fordism. The end of mass production and its transformation to flexible specialisation (Piore/Sabel) prepared the ground for a revival of enthusiasm on a large scale. Post-industrial economies rely on permanent innovation. Now discourses in media, management, and academia emphasise the relevance of buzzwords such as flexibility, adaptability, change, youth, speed, fun, and creativity. In social science debates around topics such as the cultural economy (Ray/Sayers, Cook et al., du Gay/Pryke, Amin/Thrift), affective labour (Lazzarato, Hardt/Negri, Virno) and creative industries (Florida, Hartley) gained in momentum (for an interesting take on enthusiasm see Bröckling). Enthusiasm has become an imperative for most professions. Those who are not on fire are in danger of getting fired. Producing and Consuming EnthusiasmOur interest in enthusiasm as affective labour emerged in an ethnographic and experimental project that we conducted in 2003-2007 in London’s creative industries. The project brought together three industrial and one academic partner to produce a reality TV show tailor-made for IPTV (internet-protocol-based television). During this project we encountered enthusiasm in many forms. Initially, we were faced with the need to be enthusiastic, while we established the project coalition. To be convincing, we had to pitch the commercial potential of such a project enthusiastically to our potential partners, and often we had to cope with rejections and start the search and pitch again (Caldwell). When the project coalition was set up, we as academic partners managed the network. In the following two years we had to cope with our partner’s different directions, different rhythms and different styles of enthusiasm. The TV producer for example had different ways to express excitement than the new media firm. Such differences resulted in conflicts and blockades, and part of our task as project managers was to rebuild an enthusiastic spirit after periods of frustration. At the same time enthusiasm was one of the ingredients of the digital object that we produced: `Real’ emotions form the material of most reality TV shows (Grindstaff). Affects are for reality TV, what steel was for a Fordist factory. We needed an enthusiastic audience as part of the filmed material. There is thus a need to elicit, select, engineer and film such emotions. To this aim we engaged with the participants and the audience in complex ways, sometimes by distancing ourselves, other times by consciously manipulating them, and at even other times by sharing enthusiasm (similar processes in respect to other emotions are ethnographically described in Hesmondhalgh/Baker). Generating and managing enthusiasm is obviously a necessary part of affective labour in the creative industries. However, just as Hesmondhalgh/Baker indicate, this seemingly simple claim is problematic.Affective Labour as Practice‘Affective labour’ is a term that describes labour through its products: ‘A feeling of ease, well-being, satisfaction, excitement, or passion’ (Hardt/Negri 292-293). Thus, the term ‘affective labour’ usually describes a sector by the area of human endeavour, which it commodifies. But the concept looses its coherence, if it is used to describe labour by its practice (for an analogue argument see Dowling). The latter is what interests us. Such a usage will have to re-introduce the notion of the working subject. To see affective labour as a practice should enable us to describe in more detail, how enthusiasm shapes the becoming of a cultural object. Who employed affect when and what kinds of affects in which way? Analysing enthusiasm as social practice and affective labour usually brings about one of two contrasting perceptions. On the one hand one can celebrate enthusiasm – like Pekka Himanen – as one of the key characteristics for a new work ethic emerging alongside the Protestant Ethic. On the other hand we find critique of the need to display affects. Barbara Ehrenreich shows how a forced display of enthusiasm becomes a requirement for all office workers to survive in late capitalism. Judging from our experience these two approaches need to be synthesized: Much affective labour consists in the display of affects, in showing off, in pretending. On the other hand, enthusiasm can only realise its potential, if it is ‘real’ (as opposed to enacted).With Ehrenreich, Hochschild and many others we think that an analysis of affective labour as a practice needs to start with a notion of expression. Enthusiasm can be expressed through excited gestures, rapid movements, raised voices, eyes wide open, clapping hands, speech. For us it was often impossible to separate which expression was ‘genuine’ and which was enacted. Judging from introspection, it is probable that many actors had a similar experience to ours: They mixed some genuine enthusiasm with more or less enforced forms of re-enactment. Perhaps re-enactment turned to a ‘real’ feeling: We enacted ourselves into an authentic mood - an effect that is also described as “deep acting” (Grandey). What can happen inside us, can also happen in social situations. German philosopher Max Scheler went to substantial lengths to make a case for the contagiousness of affects, and enthusiasm is one of the most contagious affects. Mutual contagiousness of enthusiasm can lead to collective elation, with or without genuine enthusiasm of all members. The difference of real, authentic affects and enacted affects is thus not only theoretically, but also empirically rather problematic. It is impossible to make convincing claims about the degree of authenticity of an affect. However, it is also impossible to ignore this ambivalence. Both ‘authentic’ and ‘faked’ enthusiasm can be affective labour, but they differ hugely in terms of their productive capacities.Enthusiasm as Productive ForceWhy is enthusiasm so important in the first place? The answer is threefold. Firstly, an enthusiastic worker is more productive. He or she will work more intensively, put in more commitment, is likely to go the so-called extra mile. Enthusiasm can create a surplus of labour and a surplus of value, thus a surplus of productivity. Secondly enthusiasm is part of the creative act. It can unleash energies and overcome self-imposed limitations. Thirdly enthusiasm is future-oriented, a stimulus for investment, always risky. Enthusiasm can be the affective equivalent of venture capital – but it is not reified in capital, but remains incorporated in labour. Thus enthusiasm not only leads to an increase of productivity, it can be productive itself. This is what makes it to one of the most precious commodities in the creative industries. To make this argument in more detail we need to turn to one of the key philosophers of affect.Thinking Enthusiasm with SpinozaFor Spinoza, all affects are derivatives of a first basic drive or appetite. Desire/appetite is the direct equivalent of what Spinoza calls Conatus: Our striving to increase our power. From this starting point, Spinoza derives two basic affects: pleasure/joy and sadness/pain. Pleasure/joy is the result of an increase of our power, and sadness/pain is the result of its decrease. Spinoza explains all other affects through this basic framework. Even though enthusiasm is not one of the affects that Spinoza mentions, we want to suggest that Spinoza’s approach enables us to understand the productivity of enthusiasm. Enthusiasm is a hybrid between desire (the drive) and joy (the basic affect). Like hope or fear, it is future-oriented. It is a desire (to increase our power) combined with an anticipated outcome. Present and the future are tightly bound. Enthusiasm differs in this respect from its closest relatives: hope and optimism. Both hope and optimism believe in the desired outcome, but only against the odds and with a presumption of doubt. Enthusiasm is a form of ecstatic and hyper-confident hope. It already rewards us with joy in the present.With Spinoza we can understand the magical trick of future-oriented enthusiasm: To be enthusiastic means to anticipate an outcome of an increased power. This anticipation increases our power in the present. The increased power in the present can then be used to achieve the increased power in the future. If successful, it becomes a self-fulfilling prophecy. It is this future-orientedness, which can make enthusiasm productive. Actions and PassionsIn its Greek origin (‘enthousiasmos’) to be enthusiastic meant to be possessed or inspired by a god. An enthusiast was someone with an intense religious fervour and sometimes someone with an exaggerated belief in religious inspiration. Accordingly, enthusiasm is often connected to the devotion to an ideal, cause, study or pursuit. In late capitalism, we get possessed by different gods. We get possessed by the gods of opportunity – in our case the opportunities of a new technology like IPTV. Obsessions cannot easily be switched on and off. This is part of affective labour: The ability to open up and let the gods of future-oriented enthusiasm take hold of us. We believe in something not for the sake of believing, but for the sake of what we believe in. But at the same time we know that we need to believe. The management of this contradiction is a problem of control. As enthusiasm now constitutes a precious commodity, we cannot leave it to mere chance. Spinoza addresses exactly this point. He distinguishes two kinds of affects, actions and passions. Actions are what we control, passions are what controls us. Joy (= the experience of increased power of acting) can also weaken, if someone is not able to control the affection that triggered the joy. In such a case it becomes a passion: An increase of power that weakens in the long run. Enthusiasm is often exactly this. How can enthusiasm as a passion be turned into an action? One possible answer is to control what Spinoza calls the ‘ideas’ of the bodily affections. For Spinoza, affections (affectiones) ‘strike’ the body, but affect (affectus) is formed of both, of the bodily affectiones, but also of our ideas of these affectiones. Can such ideas become convictions, beliefs, persuasions? Our experience suggests that this is indeed possible. The excitement about the creative possibilities of IPTV, for example, was turned into a conviction. We had internalised the affect as part of our beliefs. But we had internalised it for a prize: The more it became an idea the more stable it got, but the less it was a full, bodily affect, something that touched our nervous system. We gained power over it for the price that it became less powerful in its drive.Managing the UnmanageableIn all institutions and organisations enthusiasm needs to be managed on a regular basis. In project networks however the orchestration of affects faces a different set of obstacles than in traditional organizations. Power structures are often shifting and not formally defined. Project partners are likely to have diverging interests, different expectations and different views on how to collaborate. What might be a disappointing result for one partner can be a successful result for another one. Differences of interest can be accompanied by differences of the expression of enthusiasm. This was clearly the case in our project network. The TV company entered a state of hype and frenzy while pitching the project. They were expressing their enthusiasm with talk about prominent TV channels that would buy the product, and celebrities who would take part in the show. The new media company showed its commitment through the development of beautifully designed time plans and prototypes – one of them included the idea to advertise the logo of the project on banners placed on airplanes. This sort of enthusiastic presentation led the TV producer to oppose the vision of the new media’s brand developer: She perceived this as an example of unrealistic pipe dreams. In turn the TV producer’s repeated name-dropping led other partners to mistrust them.Timing was another reason why it seemed to be impossible to integrate the affective cohorts of all partners into one well-oiled machine. Work in TV production requires periods of heightened enthusiasm while shooting the script. Not surprisingly, TV professionals save up their energy for this time. In contrast, new media practitioners create their products on the go: hype and energy are spread over the whole work process. Their labour becomes materialised in detailed plans, concepts, and prototypes. In short, the affective machine of a project network needs orchestration. This is a question of management.As this management failed so often in our project, we could discover another issue in the universe of enthusiasm: Disappointed high spirits can easily turn into bitterness and hostility. High expectations can lead to a lack of motivation and finally to a loss of loyalty towards the product and towards other project partners. Thus managing enthusiasm is not just about timing. It is also about managing disappointment and frustration. These are techniques, which have to be well developed on the level of the self-management as well as group management.Beyond the ProjectWe want to conclude this paper with a scene that happened at the very end of the project. In a final meeting, all partners agreed – much to our surprise – that the product was a big success. At that time we as academic partners found this irritating. There were many reasons why we disagreed: we did not produce a new format, we did not get positive user feedback, and we could not sell the show to further broadcasters (our original aims). However, all of this did not seem to have any impact on this final assessment. At the time of the meeting this looked for us like surreal theatre. Looking back now, this display of enthusiasm was indeed perhaps a ‘rational’ thing to do. Most projects and products in the creative industries are not successful on the market (Frith). 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