A chopper-stabilized high-pass Delta-Sigma Modulator with reduced chopper charge injection
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香港中文大學研究人員

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摘要In this paper, a chopper-stabilized high-pass Delta-Sigma Modulator (DSM) is reported with experimental results. A new circuit technique to suppress the residual offset caused by the chopper switch charge injection is proposed. Enabled by an amplifier sharing architecture, the technique diverts the error charge generated by the critical chopper to the second stage of the modulator such that the resulted error becomes first-order high-pass shaped. Fabricated in a 0.18 mu m CMOS technology, the 2nd-order DSM realizes 82 dB dynamic range over a 1 kHz bandwidth while consuming 144 mu W from a 1.8 V supply. The offset is 403 mu V and the flicker noise is invisible in the measured output spectrum down to 4 Hz. The core area of the chip is 0.16 mm(2). (C) 2011 Elsevier Ltd. All rights reserved.
著者Zhao YS, Tang SK, Ko CT, Pun KP
期刊名稱Microelectronics Journal
出版年份2011
月份5
日期1
卷號42
期次5
出版社Elsevier
頁次733 - 739
國際標準期刊號0026-2692
語言英式英語
關鍵詞Amplifier sharing; Chopper stabilization; High-pass Delta-Sigma Modulator
Web of Science 學科類別Engineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC; Nanoscience & Nanotechnology; NANOSCIENCE & NANOTECHNOLOGY; Science & Technology - Other Topics

上次更新時間 2020-27-11 於 00:36