Title :
A low-power 8-bit SAR ADC for a QCIF image sensor
Author :
Özgün, Recep ; Lin, Joseph ; Tejada, Francisco ; Pouliquen, Philippe ; Andreou, Andreas G.
Author_Institution :
Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA
Abstract :
In this paper, we report on an 8-bit auto-calibrating successive-approximation-register (SAR) analog-to-digital converter (ADC) for ultra-low power image sensors. The fabricated design includes an on-chip bandgap voltage reference and a tunable clock generator in addition to the SAR ADC core circuitry. Aside from two power pins, the design uses only one extra pin to output the digitized samples serially. Power consumption for the design is 21μW at 0.8V supply voltage, and it is 32μW including ancillary circuits. The sampling rate varies from 370kS/s to 1.6MS/s depending on the supply voltage. The design occupies an area of 0.2mm2 in a 0.18μm CMOS process, of which 0.073mm2 is for the SAR ADC core.
Keywords :
CMOS integrated circuits; analogue-digital conversion; image sensors; integrated circuit design; integrated circuit manufacture; power consumption; CMOS; QCIF image sensor; analog-to-digital converter; low-power successive-approximation-register ADC; on-chip bandgap voltage reference; power 21 muW; power 32 muW; power consumption; power pins; size 0.18 mum; tunable clock generator; ultra-low power image sensors; voltage 0.8 V; word length 8 bit; Arrays; CMOS integrated circuits; CMOS process; Capacitors; Clocks; Photonic band gap; Power demand;
Conference_Titel :
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4244-9473-6
Electronic_ISBN :
0271-4302
DOI :
10.1109/ISCAS.2011.5937697
