Opamp Gain Insensitive MASH Sigma Delta Modulator for Wide Bandwidth Applications
學年 94
學期 2
出版（發表）日期 2006-04-06
作品名稱 Opamp Gain Insensitive MASH Sigma Delta Modulator for Wide Bandwidth Applications
作品名稱（其他語言）
著者 Chiang, Jen-shiun; Chen, Hsin-liang
單位
出版者
著錄名稱、卷期、頁數 Analog Integrated Circuits and Signal Processing 47(3),　p.281-291
摘要 This work presents a means to enhance the immunity of non-ideal opamp gain effect of the fourth order multi-stage noise shaped (MASH) sigma-delta modulator (SDM) for wide bandwidth applications. The first stage of the SDM is a low-distortion single-loop second order SDM, while the second stage is a low-distortion interpolative second order SDM with Chebyshev type II filter technique. Theoretically, the conventional MASH SDM is impacted by the nonlinear finite gain of the operational amplifier. This impact may have two main phenomena. First, it leaks the incompletely corrected quantization error to the output. Secondly, the nonlinearity causes the harmonic distortion of the input signal. The proposed architecture can reduce the distortion and the sensitivity of the nonlinear finite opamp gain to improve the performance by using low-distortion technique in the MASH SDM. Furthermore, the lower power budget and simplified digital cancellation logic can be achieved. The experimental results indicate that the dynamic range (DR) can reach 87dB with power dissipation of 65 mW. A test SDM chip for Asymmetric Digital Subscriber Line (ADSL) application is designed and implemented by TSMC 0.25 um 1P5M process.
關鍵字 Gain-insensitive;Low-distortion;Sigma-delta modulator;Switched-capacitor circuit;Wide bandwidth
語言 en
ISSN 1573-1979
期刊性質 國外
收錄於 SCI EI Scopus
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版,紙本
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/127320 )