A low power small area multi-bit quantizer with a capacitor string in Sigma-Delta modulator

Xuxia Wang, Jian Xu, Xiaobo Wu

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

1 Scopus citations

Abstract

An ultra-low power area-efficient fully differential multi-bit quantizer used in Sigma-Delta modulator (SDM) is presented. The quantizer is named as capacitor-string area-efficient (CSAE) quantizer since instead of the typical resistor string, it employs a capacitor string to avoid static power consumption. Furthermore, a novel circuit configuration with saving half number of comparators is applied to it to save area for cutting cost of chip. The novel multi-bit quantizer is designed in a standard 0.35μm CMOS process. Simulation results show that a 17-level CSAE quantizer clocked at 32 kHz achieves a power consumption of 0.225μW when the power supply voltage is 1.8V. Its area is 0.145mm2. Compared with traditional design, the proposed CSAE quantizer saves 81% power and 37% area and thus is suitable for ultra-low power applications.

Original languageEnglish (US)
Title of host publicationProceedings of the International MultiConference of Engineers and Computer Scientists 2010, IMECS 2010
Pages1115-1119
Number of pages5
StatePublished - Dec 1 2010
EventInternational MultiConference of Engineers and Computer Scientists 2010, IMECS 2010 - Kowloon, Hong Kong
Duration: Mar 17 2010Mar 19 2010

Publication series

NameProceedings of the International MultiConference of Engineers and Computer Scientists 2010, IMECS 2010

Other

OtherInternational MultiConference of Engineers and Computer Scientists 2010, IMECS 2010
CountryHong Kong
CityKowloon
Period3/17/103/19/10

Keywords

  • Area-efficient
  • CSAE multi-bit quantizer
  • SDM
  • Ultra-low power

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