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

doi:10.1109/ESSCIRC.2012.6341366

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

Department of Electrical and Electronic Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

18 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 language	English
Title of host publication	2012 Proceedings of the European Solid State Circuits Conference, ESSCIRC 2012
Pages	385-388
Number of pages	4
DOIs	https://doi.org/10.1109/ESSCIRC.2012.6341366
Publication status	Published - 2012
Event	38th European Solid State Circuits Conference, ESSCIRC 2012 - Bordeaux, France Duration: 2012 Sept 17 → 2012 Sept 21

Publication series

Name	European Solid-State Circuits Conference
ISSN (Print)	1930-8833

Other

Other	38th European Solid State Circuits Conference, ESSCIRC 2012
Country/Territory	France
City	Bordeaux
Period	12/9/17 → 12/9/21

All Science Journal Classification (ASJC) codes

Hardware and Architecture
Electrical and Electronic Engineering

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10.1109/ESSCIRC.2012.6341366

Cite this

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

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.",

author = "Gaurav Singh and Rong Wu and Youngcheol Chae and Makinwa, {Kofi A.A.}",

year = "2012",

doi = "10.1109/ESSCIRC.2012.6341366",

language = "English",

isbn = "9781467322126",

series = "European Solid-State Circuits Conference",

pages = "385--388",

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note = "38th European Solid State Circuits Conference, ESSCIRC 2012 ; Conference date: 17-09-2012 Through 21-09-2012",

}

Singh, G, Wu, R, Chae, Y & Makinwa, KAA 2012, A 20bit continuous-time ΣΔ modulator with a Gm-C integrator, 120dB CMRR and 15 ppm INL. in 2012 Proceedings of the European Solid State Circuits Conference, ESSCIRC 2012., 6341366, European Solid-State Circuits Conference, pp. 385-388, 38th European Solid State Circuits Conference, ESSCIRC 2012, Bordeaux, France, 12/9/17. https://doi.org/10.1109/ESSCIRC.2012.6341366

A 20bit continuous-time ΣΔ modulator with a Gm-C integrator, 120dB CMRR and 15 ppm INL. / Singh, Gaurav; Wu, Rong; Chae, Youngcheol et al.

2012 Proceedings of the European Solid State Circuits Conference, ESSCIRC 2012. 2012. p. 385-388 6341366 (European Solid-State Circuits Conference).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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AB - 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.

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

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