TY - JOUR
T1 - A robust 96.6-dB-SNDR 50-kHz-bandwidth switched-capacitor delta-sigma modulator for IR imagers in space instrumentation
AU - Dei, Michele
AU - Sutula, Stepan
AU - Cisneros, Jose
AU - Pun, Ernesto
AU - Jansen, Richard Jan Engel
AU - Terés, Lluís
AU - Serra-Graells, Francisco
PY - 2017/6/1
Y1 - 2017/6/1
N2 - © 2017 by the authors. Licensee MDPI, Basel, Switzerland. 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, analog calibration, nor digital compensation technique. When coupled to a 2048 × 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.
AB - © 2017 by the authors. Licensee MDPI, Basel, Switzerland. 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, analog calibration, nor digital compensation technique. When coupled to a 2048 × 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.
KW - Analog-to-digital converter (ADC)
KW - Class-AB operational amplifiers
KW - Delta-sigma modulator (DSM)
KW - Infrared imager (IR)
KW - Switched capacitors (SC)
U2 - https://doi.org/10.3390/s17061273
DO - https://doi.org/10.3390/s17061273
M3 - Article
SN - 1424-3210
VL - 17
JO - Sensors
JF - Sensors
IS - 6
M1 - 1273
ER -