Browsing by Author "Chin, YC"

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A detailed study of non-uniform quantum well infrared photodetectors
(2001-06-01)
Wang, SY
;
Chin, YC
;
Lee, CP
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
A non-uniform quantum well infrared photodetector (NUQWIP) structure is studied. By changing the doping concentration and barrier width of each quantum well, the electric field distribution can be tailored. Different transition types of NUQWIPs were fabricated. Suppressed dark current is obtained for all the NUQWIPs. The NUQWIPs show excellent performance compared with conventional uniform structures. The dark current is about an order of magnitude lower and the background limited temperature increases for 6 degrees. The electric field distribution within the structure is calculated to explain the results and characteristics of the NUQWIPs. The NUQWIP is found to be advantageous for the low cutoff energy detectors using B-C transitions. (C) 2001 Published by Elsevier Science B.V.
A new CMOS readout circuit for uncooled bolometric infrared focal plane arrays
(2000)
Yu, TH
;
Wu, CY
;
Chin, YC
;
Chen, PY
;
Chi, FW
By incorporating the basic Constant Current (CC) configuration with the buffered direct injection (BDI) structure, a new readout circuit called the constant current buffered direct injection (CCBDI) is proposed for the uncooled bolometer detector FPAs. Due to the use of BDI structure, the offset is decreased and the linearity range is increase. Thus linearity, dynamic range, and uniformity are improved. An experimental chip of 64x64 CCBDI FPA readout circuit has be designed and fabricated by using 0.5 mu m double-poly double-metal n-well CMOS technology with the cell size of 50x50 mu m(2). The measured linearity is 94.36% whereas the measured uniformity is 81.3%. Both measurement and simulation results have verified the advantageous features of the proposed CCBDI readout circuit. It is believed that the new CCBDI structure has a great potential in the applications of large uncooled bolometer FPAs.