Academic literature on the topic 'CMOS weak inversion'

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Journal articles on the topic "CMOS weak inversion"

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Dokic, Branko, Tatjana Pesic-Brdjanin, and Rados Dabic. "Analytic models of CMOS logic in various regimes." Serbian Journal of Electrical Engineering 11, no. 2 (2014): 269–90. http://dx.doi.org/10.2298/sjee140106022d.

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In this paper, comparative analytic models of static and dynamic characteristics of CMOS digital circuits in strong, weak and mixed inversion regime have been described. Term mixed inversion is defined for the first time. The paper shows that there is an analogy in behavior and functional dependencies of parameters in all three CMOS regimes. Comparative characteristics of power consumption and speed in static regimes are given. Dependency of threshold voltage and logic delay time on temperature has been analyzed. Dynamic model with constant current is proposed. It is shown that digital circuits with dynamic threshold voltage of MOS transistor (DT-CMOS) have better logic delay characteristics. The analysis is based on simplified current-voltage MOS transistor models in strong and weak inversion regimes, as well as PSPICE software using 180 nm technology parameters.
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De Jesus-Peregrina, Rogelio, Alejandro Diaz-Sanchez, Esteban Tlelo-Cuautle, and Jose Miguel Rocha-Pérez. "A novel CMOS exponential transconductor operating in weak inversion." International Journal of Electronics 95, no. 12 (December 2008): 1221–28. http://dx.doi.org/10.1080/00207210802354965.

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BOZOMITU, R. G., and V. CEHAN. "New ELIN Systems Using CMOS Transistors in Weak Inversion Operation." Advances in Electrical and Computer Engineering 13, no. 4 (2013): 99–102. http://dx.doi.org/10.4316/aece.2013.04017.

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Akbari, Meysam, Omid Hashemipour, and Farshad Moradi. "Input Offset Estimation of CMOS Integrated Circuits in Weak Inversion." IEEE Transactions on Very Large Scale Integration (VLSI) Systems 26, no. 9 (September 2018): 1812–16. http://dx.doi.org/10.1109/tvlsi.2018.2830749.

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WANG, KEPING, XUEMEI LEI, KAIXUE MA, KIAT SENG YEO, XIANG CAO, and ZHIGONG WANG. "A CMOS LOW-POWER TEMPERATURE-ROBUST RSSI USING WEAK-INVERSION LIMITING AMPLIFIERS." Journal of Circuits, Systems and Computers 22, no. 10 (December 2013): 1340034. http://dx.doi.org/10.1142/s0218126613400343.

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This paper presents a low-power CMOS receiving signal strength indicator (RSSI). The main architecture of the circuit adopts a six-stage limiting amplifier (LA) in a logarithmic-linear form, which shows a good performance in weak signal detection. The RSSI achieves high tolerance to process, voltage, and temperature (PVT) variations by utilizing the unique nature of branch currents in a transconductance amplifier. The power consumption is decreased by using the weak-inversion LAs. Full-waveform current rectification and summation are employed in the RSSI circuit to achieve high precision while maintaining low power consumption. Measured results show that in the 1 kHz–50 MHz frequency range, the input dynamic range is wider than 70 dB within ±2 dB linearity error. The chip occupies an area of 0.7 mm2 × 0.3 mm2 using a 0.18-μm CMOS. It draws 1.3 mA from a 1.8 V supply.
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Georgiou, Pantelis, and Christofer Toumazou. "ISFET characteristics in CMOS and their application to weak inversion operation." Sensors and Actuators B: Chemical 143, no. 1 (December 4, 2009): 211–17. http://dx.doi.org/10.1016/j.snb.2009.09.018.

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Papadimitriou, Konstantinos I., and Emmanuel M. Drakakis. "CMOS weak-inversion log-domain glycolytic oscillator: a cytomimetic circuit example." International Journal of Circuit Theory and Applications 42, no. 2 (September 17, 2012): 173–94. http://dx.doi.org/10.1002/cta.1847.

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Malits, Maria, Dan Corcos, Alexander Svetlitza, Danny Elad, and Yael Nemirovsky. "Thermal performance of CMOS-SOI transistors from weak to strong inversion." IEEE Instrumentation & Measurement Magazine 15, no. 5 (October 2012): 28–34. http://dx.doi.org/10.1109/mim.2012.6314512.

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Prodanov, V. I., and M. M. Green. "Bipolar/CMOS (weak inversion) rail-to-rail constant-gm input stage." Electronics Letters 33, no. 5 (1997): 386. http://dx.doi.org/10.1049/el:19970263.

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Ma, Bill, and Feng Qi Yu. "A 1.2-V 1.76-Ppm/°C Low Voltage CMOS Band-Gap Reference." Applied Mechanics and Materials 303-306 (February 2013): 1798–802. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.1798.

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This paper proposes an innovative CMOS band-gap reference (BGR) topology with a curvature-compensation by using MOS transistors operating in weak inversion region. The mechanism is analyzed thoroughly and the corresponding BGR circuit has been implemented in standard CMOS 0.18u technology. The proposed BGR achieves 1.76 ppm/°C in the range of -40°C to 120°C at 1.2V supply voltage. In addition, it consumes only 30uA current.
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Dissertations / Theses on the topic "CMOS weak inversion"

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SALAZAR, FABIO DE ALMEIDA. "DESIGN OF LOW POWER ANALOG CMOS CELLS FROM TRANSISTORS BIAS IN WEAK INVERSION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1996. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8599@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
A indústria eletrônica tem apresentado uma demanda crescente pela fabricação de aparelhos onde o baixo consumo de energia é uma das características mais importantes. Como exemplo, temos os telefones celulares, os computadores pessoais portáteis e os implantes biomédicos. Este trabalho investiga o projeto e o layout de células analógicas de consumo mil vezes menos (micropower) que os circuitos convencionais. As células desenvolvidas tanto podem ser usadas em aplicações analógicas quanto em circuitos híbridos formados por blocos digitais e blocos analógicos em um mesmo circuito integrado (mixed-mode). O trabalho desenvolvido envolveu 7 etapas principais: o estudo da operação do transistor MOS polarizado na região de inversão fraca comparado com a região de inversão forte; o estudo de estruturas básicas com dois transitores operando na inversão fraca; a conversão dos parâmetros de fabricante para a simulação das células; estudo de células analógicas a e seu projeto para baixo consumo; simulação das células e comparação com células comerciais; estudo da variação dos parâmetros de fabricação; estudo de técnicas de layout para células analógicas. Inicialmente o trabalho apresenta um resumo do estado da arte em projetos de circuitos integrados analógicos CMOS e, introduz o conceito da operação do transistor MOS em inversão fraca (weak inversion). O estudo de estruturas básicas, tais como espelhos de corrente, é o passo seguinte para a compreensão das limitações da operação dos transistores na fraca inversão e a análise de suas vantagens e desvantagens. A conversão dos parâmetros de processos fornecido pelo fabricante, do SPICE nível 2 para o SMASH nível 5, é um passo importante para uma simulação mais fiel do transistor real operando na região de inversão fraca, usando o novo modelo EKV (desenvolvido pela Escola Politécnica Federal de Lausanne - EPFL). O desenvolvimento dos blocos funcionais analógicas, tais como amplificadores operacionais, tece como estratégia de trabalho partir de especificações de células existentes em bibliotecas de fabricantes comerciais com tecnologia reconhecida sobre o assunto, e tentar reproduzir as suas características através do projeto de células dedicadas. Foram avaliadas algumas topologias de uma mesma célula com o objetivo de realizar a comparação entre elas. As medidas de desempenho das células para a comparação com as comerciais, foram realizadas com o uso de arquivos hierárquicos de simulação, visando a redução da quantidade de arquivos. Foi realizado um estudo de como a variação do processo de fabricação pode afetar o desempenho das células projetadas por análise de Montecarlo. São mostradas técnicas de layout de células analógicas que visam reduzir o descasamento entre transistores, faro este que poderia levar o circuito a apresentar comportamento diferente daquele especificado inicialmente. Os resultados alcançados demonstraram ser possível o desenvolvimento de células analógicas de baixo consumo. Através do uso da técnica de operação do transistor na região de inversão fraca, obteve-se desempenho comparável aos circuitos comerciais, tornando possível a criação de uma biblioteca de células analógicas mais ampla sem a necessidade da dependência do know-how dos fabricantes comerciais.
Low power supply consumption hás become one of the main issue in eletronic industry for many product áreas such as cellular telephones, portable personal computers and biomedical implants. The aim of this work is to investigate the main drawbacks involved in the design of CMOS analog cells biased in weak inversion. Biasing a cell in weak inversion makes it possible to archieve a power consumption that is one thousandth lower than common analog cells designed to operate in strong inversion. This work has involved the following subject: a study of models for MOS transistors operating in weak inversion and strong inversion regions; a methodology to convert LEVEL 2 Spice model to EKV model; study of basic analog cell blocks suitable to low power mixed mode IC design; design methodology for low power analog cells; comparison between these cells and some commercial ones; study of analog layout techniques. Firstly, this work reviews the state-of-art of analog cell design including MOS transistor operation and modeling in the weak inversion region. Secondly we discuss the operation of some basic structures, such as current mirors and differential amplifiers, biased in weak inversion. This study helped us to understand the benefits and drawbacks involved in working with MOS transistors biased in this region. Next we describe a methodology to convert process parameters suppied by the foundries, usually LEVEL 2 Spice model, to the EKV model that was developed by EPFL (Swiss Federal Institute of Technology - Lausanne). Since EKV model is continuous in all regions, we expect to archieve better agreement between simulation results and manufacturing results. In order to test and validate the design methodology we chose to develop first a set of cells for this foundry comforming to a foundry with expertise in low voltage analog cell design. These tests were carried ou through standardized hierarchical simulation files in order to decrease the total number of simulatiom files required. Finally, we present some techniques for the layout of analog cells that improve circuit sensibility to transistor mismatching and process variation. The work shows us that it is feasible to design low power analog circuit using MOS transistors operating in weak inversion region. The methodology was even able to synthesize cells that are similar in performance to commercial ones. Therefore, it is possible to develop a çow power analog cell library which is suitable to designing application specific integrated circuits.
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Remund, Craig Timothy. "Design of CMOS Four-Quadrant Gilbert Cell Multiplier Circuits in Weak and Moderate Inversion." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd611.pdf.

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Tumati, Sanjay. "Design of large time constant switched-capacitor filters for biomedical applications." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1479.

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This thesis investigates the various techniques to achieve large time constants and the ultimate limitations therein. A novel circuit technique for the realization of large time constants for high pass corners in switched-capacitor filters is also proposed and compared with existing techniques. The switched-capacitor technique is insensitive to parasitic capacitances and is area efficient and it requires only two clock phases. The circuit is used to build a typical switched-capacitor front end with a gain of 10. The low pass corner is fixed at 200 Hz. The high pass corner is varied from 0.159Hz to 4 Hz and various performance parameters, such as power consumption, silicon area etc., are compared with conventional techniques and the advantages and disadvantages of each technique are demonstrated. The front-ends are fully differential and are chopper stabilized to protect against DC offsets and 1/f noise. The front-end is implemented in AMI0.6um technology with a supply voltage of 1.6V and all transistors operate in weak inversion with currents in the range of tens of nano-amperes.
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Singh, Rishi Pratap. "A High-Gain, Low-Power CMOS Operational Amplifier Using Composite Cascode Stage in the Subthreshold Region." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2510.

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This thesis demonstrates that the composite cascode differential stage, operating in the subthreshold region, can form the basis of a high gain (113 dB) and low-power op amp (28.1 µW). The circuit can be fabricated without adding a compensation capacitance. The advantages of this architecture include high voltage gain, low bandwidth, low harmonic distortion, low quiescent current and power, and small chip area. These advantages suggest that this design might be well-suited for biomedical applications where low power, low noise bio-signal amplifiers capable of amplifying signals in the millihertz-to-kilohertz range is required.
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Shiraishi, Hisako. "Design of an Analog VLSI Cochlea." University of Sydney. Electrical and Information Engineering, 2003. http://hdl.handle.net/2123/556.

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The cochlea is an organ which extracts frequency information from the input sound wave. It also produces nerve signals, which are further analysed by the brain and ultimately lead to perception of the sound. An existing model of the cochlea by Fragni`ere is first analysed by simulation. This passive model is found to have the properties that the living cochlea does in terms of the frequency response. An analog VLSI circuit implementation of this cochlear model in CMOS weak inversion is proposed, using log-domain filters in current domain. It is fabricated on a chip and a measurement of a basilar membrane section is performed. The measurement shows a reasonable agreement to the model. However, the circuit is found to have a problem related to transistor mismatch, causing different behaviour in identical circuit blocks. An active cochlear model is proposed to overcome this problem. The model incorporates the effect of the outer hair cells in the living cochlea, which controls the quality factor of the basilar membrane filters. The outer hair cells are incorporated as an extra voltage source in series with the basilar membrane resonator. Its value saturates as the input signal becomes larger, making the behaviour rather closer to that of a passive model. The simulation results show this nonlinear phenomenon, which is also seen in the living cochlea. The contribution of this thesis is summarised as follows: a) the first CMOS weak inversion current domain basilar membrane resonator is designed and fabricated, and b) the first active two-dimensional cochlear model for analog VLSI implementation is developed.
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Qureshi, Muhammad Shakeel. "Integrated front-end analog circuits for mems sensors in ultrasound imaging and optical grating based microphone." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29613.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Hasler, Paul; Committee Co-Chair: Degertekin, Levent; Committee Member: Anderson, David; Committee Member: Ayazi, Farrokh; Committee Member: Brand, Oliver; Committee Member: Hesketh, Peter. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Lin, Shin-Ta, and 林信太. "The Design and Implementation of an Ultra Low Power and Small Area CMOS Voltage Reference Based on MOSFET Operated in Weak Inversion Region." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/8492jn.

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碩士
國立交通大學
電信工程系所
96
This thesis uses standard CMOS 0.18μm process technique to design and realize a stable voltage reference which does not change with temperature. In the recent years, battery-operated systems are used extensively. Along with this tendency, we demand low-power, small-area, and high performance when designing circuits. Many analog circuits need a stable voltage reference, so the thesis shows a low-power and small-area voltage reference to apply in battery-operated systems. Proposed circuits work in weak inverse region to replace the bipolar devices in conventional circuit and using proposed circuits realize CMOS voltage reference which does not change with temperature. Its power consumption only has several hundred nano-Watt and its area is only several hundred squre nanometer. In addition, the voltage derivation only has several dozens milli-Volt when temperature range is from -80℃ to 165℃. Therefore, proposed architectures can supply a stable voltage reference in battery-operated systems.
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Book chapters on the topic "CMOS weak inversion"

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Vittoz, Eric. "Weak Inversion for Ultimate Low-Power Logic." In Low-Power CMOS Circuits, 1–18. CRC Press, 2005. http://dx.doi.org/10.1201/9781420036503.ch16.

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Vittoz, Eric A. "Weak Inversion for Ultimate Low-Power Logic." In Low-Power CMOS Circuits, 16–1. CRC Press, 2018. http://dx.doi.org/10.1201/9781315220710-16.

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Fiorelli, Rafaella, Eduardo Peralías, and Fernando Silveira. "An All-Inversion-Region gm/ID Based Design Methodology for Radiofrequency Blocks in CMOS Nanometer Technologies." In Advances in Wireless Technologies and Telecommunication, 15–39. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0083-6.ch002.

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This chapter presents a design optimization methodology for analog radiofrequency (RF) blocks based on the gm/ID technique and on the exploration of all-inversion regions (from weak inversion or sub-threshold to strong inversion or above threshold) of the MOS transistor in nanometer technologies. The use of semi-empirical models of MOS transistors and passive components, as inductors or capacitors, assures accurate designs, reducing time and efforts for transferring the initial block specifications to a compliant design. This methodology permits the generation of graphical maps to visualize the evolution of the circuit characteristics when sweeping both the inversion zone and the bias current, allowing reaching very good compromises between performance aspects of the circuit (e.g. noise and power consumption) for a set of initial specifications. In order to demonstrate the effectiveness of this methodology, it is applied in the design of two basic blocks of RF transceivers: low noise amplifiers (LNAs) and voltage controlled oscillators (VCOs), implemented in two different nanometer technologies and specified to be part of a 2.4 GHz transceiver. A possible design flow of each block is provided; resulting designs are implemented and verified both with simulations and measurements.
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Conference papers on the topic "CMOS weak inversion"

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Katsiamis, A. G., and E. M. Drakakis. "Sinh filters in weak inversion CMOS technology." In 48th Midwest Symposium on Circuits and Systems, 2005. IEEE, 2005. http://dx.doi.org/10.1109/mwscas.2005.1594431.

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Cracan, Arcadie, Gabriel Bonteanu, and Radu-Gabriel Bozomitu. "A Weak-Inversion Cmos Analog Multiplier/Divider Circuit." In 2018 IEEE 24th International Symposium for Design and Technology in Electronic Packaging (SIITME). IEEE, 2018. http://dx.doi.org/10.1109/siitme.2018.8599269.

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Glaros, K. N., A. G. Katsiamis, and E. M. Drakakis. "Harmonic vs. geometric mean Sinh integrators in weak inversion CMOS." In 2008 IEEE International Symposium on Circuits and Systems - ISCAS 2008. IEEE, 2008. http://dx.doi.org/10.1109/iscas.2008.4542065.

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Anders, Jens, and Maurits Ortmanns. "Frequency noise of CMOS LC tank oscillators operating in weak inversion." In 2013 European Conference on Circuit Theory and Design (ECCTD). IEEE, 2013. http://dx.doi.org/10.1109/ecctd.2013.6662207.

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Seunghwan Baek, Hyungtae Kim, Changhwee Choi, Seungkwon Lee, and Kye eon Chang. "Large temperature coefficient PTAT current reference using weak inversion CMOS FET resistor." In 2007 Joint 50th IEEE International Midwest Symposium on Circuits and Systems (MWSCAS) and the IEEE Northeast Workshop on Circuits and Systems (NEWCAS 2007). IEEE, 2007. http://dx.doi.org/10.1109/mwscas.2007.4488789.

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Jaeger, Richard C., and Jeffrey C. Suhling. "First and Second Order Piezoresistive Characteristics of CMOS FETs: Weak through Strong Inversion." In 48th European Solid-State Device Research Conference (ESSDERC 2018). IEEE, 2018. http://dx.doi.org/10.1109/essderc.2018.8486881.

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Wang, Keping, Jiangmin Gu, Kok Meng Lim, Jinna Yan, Wei Meng Lim, Xiang Cao, Zhigong Wang, Kaixue Ma, and Kiat Seng Yeo. "A CMOS low-power receiving signal strength indicator using weak-inversion limiting amplifiers." In 2011 International Conference of Electron Devices and Solid-State Circuits (EDSSC). IEEE, 2011. http://dx.doi.org/10.1109/edssc.2011.6117642.

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Kompitaya, Pantre, and Khanittha Kaewdang. "A low-voltage low-power CMOS weak inversion true rms-to-dc converter." In 2011 8th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON 2011). IEEE, 2011. http://dx.doi.org/10.1109/ecticon.2011.5947779.

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Velarde-Ramirez, J., G. Vicente-Sanchez, T. Serrano-Gotarredona, and B. Linares-Barranco. "A mismatch characterization and simulation environment for weak-to-strong inversion CMOS transistors." In Microtechnologies for the New Millennium 2005, edited by Jose F. Lopez, Francisco V. Fernandez, Jose Maria Lopez-Villegas, and Jose M. de la Rosa. SPIE, 2005. http://dx.doi.org/10.1117/12.607710.

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Han, Dong, and Yuanjin Zheng. "A Low-Voltage Low-Power CMOS Weak Inversion Log Domain Auto Gain Control Module." In 2007 International Symposium on Integrated Circuits - ISIC 2007. IEEE, 2007. http://dx.doi.org/10.1109/isicir.2007.4441904.

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