English  |  正體中文  |  简体中文  |  Items with full text/Total items : 52052/87180 (60%)
Visitors : 8895506      Online Users : 122
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/35802

    Title: Design of low-power high-resolution sigma-delta modulators for low-speed low-noise and high-speed multi-mode applications
    Other Titles: 低功率高解析三角積分調變器設計:以低速低雜訊與高速多模式應用為例
    Authors: 陳信良;Chen, Hsin-liang
    Contributors: 淡江大學電機工程學系博士班
    江正雄;Chiang, Jen-shiun
    Keywords: 低功率;高解析;三角積分調變器;低雜訊;多模式;雙重取樣;虛擬隨機切流式穩定技術;low-power;High-Resolution;Low-Noise;Multi-Mode;Sigma-Delta Modulator;Double-Sampled;Pseudorandom Chopper-Stabilization;Software-Defined Radio
    Date: 2009
    Issue Date: 2010-01-11 07:10:56 (UTC+8)
    Abstract: 隨著半導體製程技術的演進,電源電壓不斷的降低,信號大小亦隨之降低,唯有降低雜訊與誤差能量,才能在先進製程技術中製作高解析之三角積分調變器,藉由對物理特性上的低頻閃爍雜訊與寬頻熱雜訊的分析、控制與消除,再配合非理想電路的分析與設計始可得到最佳解析度。
    With the progressing semiconductor process, the signal reduces with the decreasing power supply. Therefore, the only way to implement the high-resolution SDM in the modern process is to reduce the noise power. For reaching the high-resolution, the physical noises of the flicker and thermal ones have to be analyzed, controlled, and cancelled. Meanwhile, to model the circuit nonidealities and noise phenomena into the system design process can optimize the system coefficients for reducing power dissipation.
    In this dissertation, low power and high-resolution SDMs are verified with the optimizing system and circuit design for the low and high bandwidth applications. The proposed pseudorandom chopper stabilization technique reduces the flicker noise and the offset voltage for low noise bio-signal SDMs. On the other hand, with switchable operational amplifier, the double-sampled multi-stage noise shaped (MASH) SDM optimizes power dissipation for multi-mode software-defined ratio (SDR) front-end receiver. The proposed SDMs are descript briefly as follows:
    The proposed low noise bio-signal SDM is implemented with TSMC 0.35-um process. Using the proposed technique, the modulator achieves 92 dB of dynamic range and −135 dB of noise floor while consuming 950 μW from a 3 V supply. Based on the experimental results, the pseudorandom chopper-stabilization technique has a DC offset voltage that is 6 dB lower than that of the chopper-stabilization technique, and retains a thermal noise floor that is 1.6 dB lower than that of the correlated double sampling technique.
    The proposed switchable double-sampled fourth-order MASH SDM is implemented with TSMC 0.13-um process. Using the switchable operational amplifier technique and proposed architecture, the modulator achieves 100/72/75 dB of dynamic range and 96/68/71 dB of signal to noise and distortion ratio while consuming 4.2/11.3/20.2 mW from a 1.2 V supply. Based on the power-optimized strategy from the views of circuit and system, the proposed SDM is a low power multi-mode modulator for the future SDR front-end receiver.
    Appears in Collections:[電機工程學系暨研究所] 學位論文

    Files in This Item:

    File SizeFormat

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback