A chopper-stabilized high-pass Delta-Sigma Modulator with reduced chopper charge injection
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AbstractIn 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.
All Author(s) ListZhao YS, Tang SK, Ko CT, Pun KP
Journal nameMicroelectronics Journal
Volume Number42
Issue Number5
Pages733 - 739
LanguagesEnglish-United Kingdom
KeywordsAmplifier sharing; Chopper stabilization; High-pass Delta-Sigma Modulator
Web of Science Subject CategoriesEngineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC; Nanoscience & Nanotechnology; NANOSCIENCE & NANOTECHNOLOGY; Science & Technology - Other Topics

Last updated on 2021-17-09 at 01:17