A Robust 96.6-dB-SNDR 50-kHz-Bandwidth Switched-Capacitor Delta-Sigma Modulator for IR Imagers in Space Instrumentation
Dei, Michele (Institut de Microelectrònica de Barcelona)
Sutula, Stepan (Institut de Microelectrònica de Barcelona)
Cisneros-Fernández, Jose (Institut de Microelectrònica de Barcelona)
Pun, Ernesto (Arquimea Ingenierìa S.L.U.)
Jansen, Richard Jan Engel (European Space Research and Technology Centre)
Terés, Lluís (Universitat Autònoma de Barcelona. Departament de Microelectrònica i Sistemes Electrònics)
Serra Graells, Francesc (Universitat Autònoma de Barcelona. Departament de Microelectrònica i Sistemes Electrònics)

Date:	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-mm 2 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, analog calibration, nor digital compensation technique. When coupled to a 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.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Infrared imager (IR) ; Analog-to-digital converter (ADC) ; Delta-sigma modulator (DSM) ; Switched capacitors (SC) ; Class-AB operational amplifiers
Published in:	Sensors (Basel, Switzerland), Vol. 17, Issue 6 (June 2017) , art. 1273, ISSN 1424-8220

DOI: 10.3390/s17061273
PMID: 28574466

19 p, 1.8 MB

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