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Sensors 2017, 17(6), 1273; doi:10.3390/s17061273

A Robust 96.6-dB-SNDR 50-kHz-Bandwidth Switched-Capacitor Delta-Sigma Modulator for IR Imagers in Space Instrumentation

1
Instituto de Microelectrónica de Barcelona IMB-CNM(CSIC), 08193 Barcelona, Spain
2
Arquimea Ingenierìa S.L.U., 28918 Madrid, Spain
3
European Space Research and Technology Centre, 2201 AG Noordwijk, The Netherlands
4
Department of Microelectronics and Electronic Systems of Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
This paper is an extended version of our paper published in Proceedings of the IEEE International Symposium on Circuits and Systems, Montréal, QC, Canada, 22–25 May 2016; pp. 61–64.
*
Author to whom correspondence should be addressed.
Academic Editor: A. G. Unil Perera
Received: 13 April 2017 / Revised: 17 May 2017 / Accepted: 31 May 2017 / Published: 2 June 2017
(This article belongs to the Special Issue Infrared Detectors)
View Full-Text   |   Download PDF [1842 KB, uploaded 5 June 2017]   |  

Abstract

Infrared imaging technology, used both to study deep-space bodies’ radiation and environmental changes on Earth, experienced constant improvements in the last few years, pushing data converter designers to face new challenges in terms of speed, power consumption and robustness against extremely harsh operating conditions. This paper presents a 96.6-dB-SNDR (Signal-to-Noise-plus-Distortion Ratio) 50-kHz-bandwidth fourth-order single-bit switched-capacitor delta-sigma modulator for ADC operating at 1.8 V and consuming 7.9 mW fit for space instrumentation. The circuit features novel Class-AB single-stage switched variable-mirror amplifiers (SVMAs) enabling low-power operation, as well as low sensitivity to both process and temperature deviations for the whole modulator. The physical implementation resulted in a 1.8-mm2 chip integrated in a standard 0.18-µm 1-poly-6-metal (1P6M) CMOS technology, and it reaches a 164.6-dB Schreier figure of merit from experimental SNDR measurements without making use of any clock bootstrapping,analogcalibration,nordigitalcompensationtechnique. Whencoupledtoa2048×2048 IR imager, the current design allows more than 50 frames per minute with a resolution of 16 effective number of bits (ENOB) while consuming less than 300 mW. View Full-Text
Keywords: infrared imager (IR); analog-to-digital converter (ADC); delta-sigma modulator (DSM); switched capacitors (SC); class-AB operational amplifiers infrared imager (IR); analog-to-digital converter (ADC); delta-sigma modulator (DSM); switched capacitors (SC); class-AB operational amplifiers
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Dei, M.; Sutula, S.; Cisneros, J.; Pun, E.; Jansen, R.J.E.; Terés, L.; Serra-Graells, F. A Robust 96.6-dB-SNDR 50-kHz-Bandwidth Switched-Capacitor Delta-Sigma Modulator for IR Imagers in Space Instrumentation. Sensors 2017, 17, 1273.

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