Littérature scientifique sur le sujet « Digital OTA »

The constant strive for improvement of digital video capturing speeds together with power efficiency increase, has lead to tremendous research activities in the image sensor readout field during the past decade. The improvement of lithography and solid-state technologies provide the possibility of manufacturing higher resolution image sensors. A double resolution size-up, leads to a quadruple readout speed requirement, if the same capturing frame rate is to be maintained. The speed requirements of conventional serial readout techniques follow the same curve and are becoming more challenging to design, thus employing parallelism in the readout schemes appears to be inevitable for relaxing the analog readout circuits and keeping the same capturing speeds. This transfer however imposes additional demands to parallel ADC designs, mainly related to achievable accuracy, area and power. In this work a 12-bit Cyclic ADC (CADC) aimed for column-parallel readout implementation in CMOS image sensors is presented. The aim of the conducted study is to cover multiple CADC sub-component architectures and provide an analysis onto the latter to a mid-level of depth. A few various Multiplying DAC (MDAC) structures have been re-examined and a preliminary redundant signed-digit CADC design based on a 1.5-bit modified flip-over MDAC has been conducted. Three comparator architectures have been explored and a dynamic interpolative Sub-ADC is presented. Finally, some weak spots degrading the performance of the carried-out design have been analyzed. As an architectural improvement possibility two MDAC capacitor mismatch error reduction techniques have been presented.

Made available in DSpace on 2018-08-02T00:01:05Z (GMT). No. of bitstreams: 1 tese_6874_Dissertação - Matheus Brunoro Dilem.pdf: 3396145 bytes, checksum: 23d4b2f43ce73a4286b75baac4e3e12e (MD5) Previous issue date: 2014-08-21<br>A demanda de novas tecnologias de transporte de dados cada vez mais velozes e com garantias de QoS (Quality of Service), ocasionadas pelo crescimento do tráfego da Internet, traz um grande desafio na área de redes de telecomunicação. As redes ópticas de transporte se apresentam como uma solução para as elevadas taxas de transmissão. No intuito de tornar as redes de núcleo mais flexíveis e ajustadas à dinamicidade e heterogeneidade das demandas, a ITU-T (International Telecommunication Union Telecommunication Standardization Sector) desenvolve uma série de recomendações abordando as mais diversas características das redes OTN (Optcial Transport Network), no contexto das redes de núcleo, determinando suas funcionalidades. Esta dissertação tem como objetivo desenvolver uma proposta de arquitetura OTN Switch, com o funcionamento da cross-conexão e da multiplexação de sinais ópticos e digitais presentes nas redes OTN. Para tal, sua arquitetura basea-se nas recomendações geradas pela ITU-T, tornando-a capaz de prover interoperabilidade com equipamentos já existentes.

Dizertační práce se zabývá elektronicky nastavitelnými oscilátory, studiem nelineárních vlastností spojených s použitými aktivními prvky a posouzením možnosti vzniku chaotického signálu v harmonických oscilátorech. Jednotlivé příklady vzniku podivných atraktorů jsou detailně diskutovány. V doktorské práci je dále prezentováno modelování reálných fyzikálních a biologických systémů vykazujících chaotické chování pomocí analogových elektronických obvodů a moderních aktivních prvků (OTA, MO-OTA, CCII ±, DVCC ±, atd.), včetně experimentálního ověření navržených struktur. Další část práce se zabývá možnostmi v oblasti analogově – digitální syntézy nelineárních dynamických systémů, studiem změny matematických modelů a odpovídajícím řešením. Na závěr je uvedena analýza vlivu a dopadu parazitních vlastností aktivních prvků z hlediska kvalitativních změn v globálním dynamickém chování jednotlivých systémů s možností zániku chaosu v důsledku parazitních vlastností použitých aktivních prvků.

The increased implementation of digital health technologies requires a better understanding of how to design technologies and services that enhance people's engagement with their health. This thesis contributes new knowledge about i) an increased understanding of the different ways in which people engage with digital health technologies, ii) the stages of people's engagement with digital health technologies over time, and iii) the features that support such engagement. The findings offer new directions for the digital health industry to further develop their service design. They also support people's engagement with their health goals through tailoring their services more effectively to end-users.

International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California<br>Hardware architecture and design details of a multi-channel GPS signal simulator with highly flexibility is presented, while the dynamic performance objectives and the requirements on the hardware architecture are discussed. The IF part of the simulator is implemented almost entirely in the digital domain by use of a field programmable gate array (FPGA), which mainly include C/A code generators, carrier generators, spreaders, and BPSK modulators. The results of testing the proposed simulator hardware architecture at IF with the help of a GPS receiver are presented.

The research described in this thesis examines indigenous language usage in a digital library environment that has been accessed via the Internet. By examining discretionary use of the Māori Niupepa and Hawaiian Nūpepa digital libraries this research investigates how indigenous languages were used in these electronic environments in 2005. The results provide encouragement and optimism to people who are striving to retain, revitalise and develop the use of indigenous languages in information technologies. The Transaction Log Analysis (TLA) methods used in this research serve as an example of how web logs can be used to provide significant information about language usage in a bilingual online information system. Combining the TLA with user feedback has provided insights into how and why clients use indigenous languages in their information retrieval activities. These insights in turn, show good practice that is relevant not only to those working with indigenous languages, indigenous peoples or multilingual environments, but to all information technology designers who strive for universal usability. This thesis begins by describing the importance of using indigenous languages in electronic environments and suggests that digital libraries can provide an environment to support and encourage the use of such languages. TLA is explained in the context of this study and is then used to analyse aspects of te reo Māori usage in the Niupepa digital library environment in 2005. TLA also indicates that te reo Māori was used by international clients and this usage differed to te reo Māori usage by national (Aotearoa) clients. Findings further reveal that the default language setting of the Niupepa digital library had a considerable impact on te reo Māori usage. When the default language was set to te reo Māori not only were there more requests in te reo Māori but there was also a higher usage of te reo Māori in the information retrieval activities. TLA of the Hawaiian Nūpepa digital library indicated that the Hawaiian language was also used in a digital library. These results confirm that indigenous languages were used in digital library environments. Feedback from clients suggests reasons why indigenous languages were used in this environment. These reasons include the indigenous language content of the digital library, the indigenous language default language setting of the digital library and a stated desire by the clients to use the indigenous language. The key findings raise some interface design issues and support the claim that digital libraries can provide an environment to support the use of indigenous languages.

<p>This thesis is a study of a new specification for end user interactivity developed by the Open Mobile Alliance, the specification is called OMA BCAST Service Interaction Function. The specification is one part of the OMA BCAST Service Enabler, which enables service delivery to mobile devices, where the most common service is mobile television. The Service Interaction Function enables end user interactivity related to a service, this could be a poll about the current television program or a chat where every message is presented to the users that are watching the same channel.</p><p>The specification is still of draft version and the scope of this thesis has been to investigate the Service Interaction Function and implement a PC prototype.</p>

This project proposes a new conceptual framework for the regulation of social networks and virtual communities. By applying a model based upon the rule of law, this thesis addresses the growing tensions that revolve around the public use of private networks. This research examines the shortcomings of traditional contractual governance models and cyberlaw theory and provides a reconstituted approach that will allow public constitutional-type interests to be recognised in the interpretation and enforcement of contractual doctrine.

This thesis investigates the organization culture and information culture in the archives of the Lutheran Church of Sweden. The church is the largest Christian denomination in Sweden. Since the year 2000 it is no longer a state church, though some legal, economic and even mental bonds to the state still exist. The main focus of the thesis is to investigate the influence of cultural aspects on a recent project concerning a general system for information management and digital archiving. A subsequent question is how these cultural aspects may affect the church’s future role as a cultural heritage actor. The thesis, as a framework, uses two models: one for organization culture (Granberg) and one for information culture (Choo). It combines them to a single model and connects them with Kirk’s studies on information use. Four semi-structured interviews, with archivists on national level and in two dioceses, were conducted and transcribed. In addition, related documents were studied. A qualitative analysis was carried out on the data. One conclusion made is that the general culture on national level and in the dioceses can be described as a relationship-based and professional culture. Another conclusion is that parallel cultures do exist within the church, especially in the dioceses. These parallel cultures affect the information use and information behaviour. The diminishing role of the church in the future may be the force which merges these parallel cultures into one. There are also major differences on what to count as the cultural heritage of the church. The author argues that the church should act more decisively to define its heritage and to claim its future role in the field of cultural heritage. This is a two years master’s thesis in Archival Science.