A fourth-order feedforward continuous-time delta-sigma ADC with 3MHz bandwidth

Sheng Wen Huang, Zong Yi Chen, Chung-Chih Hung, Chia Min Chen

研究成果: Conference contribution同行評審

7 引文 斯高帕斯(Scopus)

摘要

A fourth-order feedforward continuous-time (CT) delta-sigma modulator is presented. The modulator takes an active-RC OpAmp as the first stage because of the high-linearity requirement, and the other three stages are composed by Gm-C integrators. In feedforward topology, a higher out-of-band NTF gain could be taken for better performance. As we know, the most important part in the feedforward CT ΔΣ modulator is the summation circuit for the feedforward paths. The modulator uses a tuning adder, which we propose, to make sure the modulator can work correctly even under the influence of the process variation on resistors. Finally, the delta-sigma modulator is implemented in standard digital 0.18-μm CMOS process, which achieves 57.84 dB SNDR over a 3MHz signal bandwidth at an OSR of 16.67. The power consumption of the CT delta-sigma modulator is 11.8 mW from the 1.8-V supply.

原文English
主出版物標題2010 IEEE International 53rd Midwest Symposium on Circuits and Systems, MWSCAS 2010
頁面33-36
頁數4
DOIs
出版狀態Published - 20 九月 2010
事件53rd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2010 - Seattle, WA, United States
持續時間: 1 八月 20104 八月 2010

出版系列

名字Midwest Symposium on Circuits and Systems
ISSN(列印)1548-3746

Conference

Conference53rd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2010
國家United States
城市Seattle, WA
期間1/08/104/08/10

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