Title :
A novel method to realize automatic gain adjust for infrared readout integrated circuit
Author :
Dan, Liu ; Yacong, Zhang ; Zhongjian, Chen ; Baoying, Zhao ; Lijiu, Ji
Author_Institution :
Inst. of Microelectron., Peking Univ., Beijing, China
Abstract :
A novel method to adjust gain in CMOS infrared (IR) readout integrated circuit (ROIC) which is suitable for the application of small pixel size has been proposed in this paper. Current mirror is inserted in the pixel to adjust gain. Two comparators have been added outside of the pixel and provide the decision to select different gains. Adjustable gain makes the design of following signal process circuit easier and allows long integration time to increase SNR. With this method of automatic gain adjust, ROIC can deal with the current that varies from 40nA to 300nA, with the integration capacitor of 2pF and the integration time of 40μs. An experimental 4×4-pixel ROIC has been designed and it will be fabricated with 0.5μm DPDM n-well CMOS process.
Keywords :
CMOS integrated circuits; comparators (circuits); current mirrors; focal planes; infrared detectors; integrated circuit design; readout electronics; 0.5 micron; 2 pF; 40 mus; 40 to 300 nA; CMOS integrated circuit; automatic gain adjust; comparators; current mirror; infrared readout integrated circuit; integrated circuit design; signal process circuit; Application specific integrated circuits; CMOS integrated circuits; Capacitors; Microelectronics; Mirrors; Operational amplifiers; Photoconductivity; Signal design; Signal processing; Voltage; CMOS; ROIC; different gain choices; infrared FPA;
Conference_Titel :
ASIC, 2005. ASICON 2005. 6th International Conference On
Print_ISBN :
0-7803-9210-8
DOI :
10.1109/ICASIC.2005.1611335
