A 20bit continuous-time ΣΔ modulator with a Gm-C integrator, 120dB CMRR and 15 ppm INL

Gaurav Singh, Rong Wu, Youngcheol Chae, Kofi A.A. Makinwa

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

13 Citations (Scopus)

Abstract

This paper describes a precision continuous-time sigma-delta modulator for sensor readout applications. Its input stage consists of a high-impedance Gm-C integrator. The nonlinearity of the input transconductor is compensated for by the inclusion of a low-pass filter and an identical transconductor in the feedback path of the single-bit modulator. The second-order modulator achieves 1 μV offset, 120 dB CMRR and 20-bit resolution over a ±40 mV input range at a conversion rate of 10 S/s. It also achieves 15 ppm INL and less than 100 dB THD for AC signals up to 200 Hz. The modulator is implemented in a 0.7μm CMOS process and draws 240 μA from a 5 V supply.

Original languageEnglish
Title of host publication2012 Proceedings of the European Solid State Circuits Conference, ESSCIRC 2012
Pages385-388
Number of pages4
DOIs
Publication statusPublished - 2012
Event38th European Solid State Circuits Conference, ESSCIRC 2012 - Bordeaux, France
Duration: 2012 Sep 172012 Sep 21

Publication series

NameEuropean Solid-State Circuits Conference
ISSN (Print)1930-8833

Other

Other38th European Solid State Circuits Conference, ESSCIRC 2012
CountryFrance
CityBordeaux
Period12/9/1712/9/21

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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