A 20μW 95dB DR single-bit delta-sigma modulator for portable measurement applications

Jian Xu, Hanqing Wang, Xiaobo Wu

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

3 Scopus citations

Abstract

A low power high performance Delta-Sigma modulator for portable measurement applications is presented in this paper. To reduce the power consumption and ensure high performance, a comprehensive system-level design adopting a new method to determine the DC gain value of Operational Transconductance Amplifier (OTA) and considering the effect of 1/f noise is introduced. Besides, a novel power efficient current mirror Class-AB OTA with a fast-settling less-error switched-capacitor common-mode feedback (SC CMFB) circuit is proposed in this design. And the bottom terminal parasitic- effect of Poly-Insulator-Poly (PIP) capacitors is also considered. Therefore, about extra 20% of the capacitance is added to the total capacitance load. In addition, an area-efficient power-efficient resonator is adopted to realize a coefficient of 1/90 for 50% power and 75% area cost reduction over the conventional design. The chip is implemented in a low cost standard 0.35μm CMOS. Its total power is only 20μW at a 1.5V supply, and the measured Dynamic Range (DR) is 95dB over the 1 kHz bandwidth. The designed modulator shows very high Figure-of-Merit (FOM) among the recent low power high performance modulators.

Original languageEnglish (US)
Title of host publicationProceedings of the International MultiConference of Engineers and Computer Scientists 2010, IMECS 2010
Pages1227-1232
Number of pages6
StatePublished - Dec 1 2010
EventInternational MultiConference of Engineers and Computer Scientists 2010, IMECS 2010 - Kowloon, Hong Kong
Duration: Mar 17 2010Mar 19 2010

Other

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

    Fingerprint

Keywords

  • Delta-Sigma modulator
  • High performance
  • Low power
  • Switched capacitor circuits

Cite this

Xu, J., Wang, H., & Wu, X. (2010). A 20μW 95dB DR single-bit delta-sigma modulator for portable measurement applications. In Proceedings of the International MultiConference of Engineers and Computer Scientists 2010, IMECS 2010 (pp. 1227-1232)