M.S. Theses

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Browsing M.S. Theses by Subject "Analog-to-digital converters -- Design and construction."

Now showing 1 - 3 of 3
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    An analytical performance estimation tool for analog computer aided design
    (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2003., 2003.) Kayaaltı, Balkır.; Dündar, Günhan,
    Automatic analog design tools are very attractive for the integrated circuit (IC) providers, because they increase the employees' efficiency and productivity; eliminate the high time and effort consumption. A performance evaluator is needed to spend no time for optimization of the unfeasible circuits and circuits which can not meet specifications.The work in this thesis is part of a complete analog design automation system from top level to the lowest level of synthesis. The work concentrates on analog circuits built with CMOS (Complementary Metal Oxide Semiconductor) transistors which are the current and future trend of analog circuit design. Partitioning of the problem to simpler sub problems is the major strategy used. General design equations valid for all analog systems are used to model the sub-blocks. Design equations of the sub blocks are arranged according to the sub block type and the succeeding block. Finally equations are found relating design specifications to the design parameters.The system has been realized and used and the results are compared with the results of the industry standard simulation tools. The tool is very fast as aimed and useful; it has been seen that it is enough fast and it gives the information to ease the actual design for a optimizer.
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    Design and radiation analysis of various analog to digital converters
    (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2023., 2023) Türker, Atakan.; Dündar, Günhan, 1959- .; Ozanoğlu, Kemal.
    This study is on the schematic level design of various ADCs and their radiation analysis. In this context, ADCs with three different architectures, which are flash ADC, SAR ADC, and sigma-delta ADC, are designed and tested under temporary and permanent radiation effects. The flash ADC is designed in Verilog-A, which is a modeling language for analog circuits, whereas SAR ADC and sigma-delta modulator are designed by utilizing transistors in 65nm CMOS technology. The designed ADCs are examined under the SET effect, which causes temporary effects on the circuit, and the TID effect, which causes permanent effects. The designed flash ADC is examined only under the effect of TID, and the results of this effect are presented. For the SAR ADC, designs are made using two different capacitive DAC topologies to be able to compare with each other. These SAR ADCs are examined under the effects of TID and SET separately, and the results are explained. As a result of SET simulations of ADCs, the radiation performances of the designed ADCs are compared, and the sensitive nodes of the DACs are determined. In the sigma-delta ADC part, a first- order modulator is designed and investigated under the effects of TID and SET. In addition to the presented results, the sensitive nodes of the integrator are determined, and various inferences are made.
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    Design of a continuous-time current-mode sigma-delta analog-to-digital converter
    (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.) Çitkaya, Ahmet Yasin.; Cerid, Ömer.
    The importance of the Analog-to-Digital converters (ADC) is increasing due to the necessity of an interface between the analog and digital world where computing and signal processing are executed. Over the last years, their low cost development and good linearity made sigma-delta (ΣΔ) type converters widely available. In this thesis, due to their various advantages like low voltage operation, and lower power consumption than their discrete time (DT) counterpart, continuous time (CT) ΣΔ has been studied. This thesis presents the design of a continuous time current-mode ΣΔ ADC starting from the building blocks as integrator, comparator and digital to analog converter (DAC) and its control circuitry. The transistor level circuit designs are verified with SPICE simulations.