Ultra low-FOM high-precision ΔΣ modulators with fully-clocked SO and zero static power quantizers

Jian Xu, Xiaobo Wu, Menglian Zhao, Rui Fan, Hanqing Wang, Xiaofen Ma, Bill Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

In this paper, two high-precision switched-opamp (SO) based ΔΣ modulators with ultra low figure-of-merit (FOM) are introduced respectively for bio-medical and audio applications. To save 50% power, both modulators adopt novel fully-clocked current mirror SOs with new bias circuits especially designed for SO. Besides, several measures are proposed separately in two modulators to ensure high performances. Both circuitries are implemented in 0.18μm CMOS. The modulator-I, for bio-medical applications, employs high density MOSCAPs to reduce chip area. Also, an innovative zero static power quantizer using MOSCAP-strings is developed to save up to 96% power and 69% area than traditional structure. With only 13μW power consumption at 1.0V supply voltage, it achieves 85dB peak-SNDR, 44.7fJ/conv.-step FOM for 10 kHz bandwidth. In the modulator-II, for audio applications, a novel 17-level scheme consisting of only nine comparators and two capacitor-strings is introduced to remove static power completely and save 40% chip area over the traditional quantizer. In addition, a dual cycle shift (DCS) DWA technique is introduced here to suppress in-band tone effectively. The modulator-II achieves 92dB peak-SNDR and 35.6fJ/conv.-step FOM with only 58μW power consumption at 0.9V supply voltage.

Original languageEnglish (US)
Title of host publication2011 IEEE Custom Integrated Circuits Conference, CICC 2011
DOIs
StatePublished - Nov 9 2011
Event33rd Annual Custom Integrated Circuits Conference - The Showcase for Circuit Design in the Heart of Silicon Valley, CICC 2011 - San Jose, CA, United States
Duration: Sep 19 2011Sep 21 2011

Publication series

NameProceedings of the Custom Integrated Circuits Conference
ISSN (Print)0886-5930

Other

Other33rd Annual Custom Integrated Circuits Conference - The Showcase for Circuit Design in the Heart of Silicon Valley, CICC 2011
CountryUnited States
CitySan Jose, CA
Period9/19/119/21/11

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