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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24152
Title: | 低功率低電壓連續型三角積分調變器設計 Design of Low-Power, Low-Voltage Continuous-Time Delta-Sigma Modulator |
Authors: | Chun-Kuan Wu 吳俊寬 |
Advisor: | 林宗賢(Tsung-Hsien Lin) |
Keyword: | 連續型,三角積分, continuou-time,delta-sigma, |
Publication Year : | 2005 |
Degree: | 碩士 |
Abstract: | 近幾年,由於無線通訊系統已經變成重要的傳輸工具,而且相關的規格亦不斷的往更高的頻寬演進,因此發展高效能的相關電路技術也成了很急迫要發展的方向。
本論文將以接收端中的類比到數位轉換器 (ADC) 為一個研究主題,而由於連續型三角積分調變器(continuous-time delta-sigma ADC)可以在低電壓、低功率操作下達到高的解析度因此適合用於高效能接收機,因此本論文將以連續型三角積分調變器為研究方向。 在本論文中,是以低電壓、低功率操作為目標,並在系統的設計上達到可以切換操作模式(帶通、以及低通轉換器),以期可以適用在多用途的通訊架構上。為了要達到低電壓、低功率的設計,本論文提供兩種設計的方法: (一)、Active gain enhancement OTA,(二)、Sliding quantizer。 此晶片使用 TSMC 0.18-μm CMOS 製程,供應電壓為1.2 V,消耗功率為1.2 mW,模擬結果為,帶通模式可以在1-MHz 的頻寬內得到 SNR值為 68 dB,並且在低通模式時可以在1.92-MHz的頻寬內得到 SNR值為 63 dB。 此晶片使用 TSMC 0.18μm CMOS 製程,供應電壓為1.2 V,消耗功率為1.2 mW,模擬結果為,帶通模式可以在1-MHz 的頻寬內得到 SNR值為 66 dB,並且在低通模式時可以在1.92-MHz的頻寬內得到 SNR值為 61 dB. Recently, the wireless communication systems become an important tool for data link, and the specification varies day by day. Developing the high-performance circuits for wireless communication systems is an important issue. The thesis focuses on the analog-to-digital converter in receiver design. The continuous-time delta-sigma ADC is suitable for high-performance receiver design because of the high resolution in low-voltage, and low-power operation. Therefore, we emphasize on the research of continuous-time delta-sigma ADC. In this work, a dual-mode continuous-time delta-sigma ADC is designed and implemented for the diversity of current communication architectures. In order to achieve low-voltage, and low-power design, two new design methods are proposed: 1. Active gain enhancement OTA, 2. Sliding quantizer, and will be discussed next. The chip is designed with a 1.2-V power supply using 0.18-μm TSMC CMOS process and the power consumption is 1.2 mW. The post-layout simulation result shows that the ADC achieves a 68-dB signal-to-noise ratio (SNR) within a 1-MHz bandwidth centered at 2-MHz in band-pass mode; and 63-dB SNR in 1.92-MHz bandwidth within the low-pass mode. Both with a sampling rate of 48 MHz. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24152 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 電子工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-94-1.pdf Restricted Access | 2.47 MB | Adobe PDF |
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