Title :
Novel current-mode background suppression for 2-D LWIR applications
Author :
Woo, Doo Hyung ; Kang, Sang Gu ; Lee, Hee Chul
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejon, South Korea
Abstract :
A new readout circuit involving two-step current-mode background suppression is studied for two-dimensional long-wavelength infrared focal plane arrays (2-D LWIR FPAs). Buffered direct injection (BDI) and a feedback amplifier are used for the input circuit and background suppression circuit, respectively. The readout circuit has been fabricated using a 0.6-μm 2-poly 3-metal CMOS process for a 64×64 LWIR HgCdTe IR array with a pixel size of 50 μm×50 μm. The simple pixel circuit has a very small skimming error of less than 0.3% and low noise characteristics for an adequate calibration range and integration time.
Keywords :
feedback amplifiers; focal planes; infrared detectors; interference suppression; readout electronics; 2D LWIR applications; 2D long-wavelength infrared focal plane arrays; buffered direct injection; feedback amplifier; readout circuit; simple pixel circuit; two-step current-mode background suppression; Calibration; Capacitors; Circuit noise; Feedback amplifiers; Feedback circuits; Infrared detectors; Photoconductivity; Signal generators; Signal to noise ratio; Two dimensional displays; Current copier cell; current-mode background suppression; infrared focal plane array (FPA); readout circuit;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2005.850456
