Low-crosstalk column differencing circuit architecture for integ

Details Low-crosstalk column differencing circuit architecture for integ Low-crosstalk column differencing circuit architecture for integ

1996-12-20

1998-05-12

Glick, Edward J.

Radiant energy

Invisible radiant energy responsive electric signalling

Semiconductor system

25037008, 257440, H01L 27146, H01L 31101

Patent

active

057510059

ABSTRACT:
An integrated two-color staring focal plane array is comprised of rows and columns of photodetector unit cells (10), each being capable of simultaneously integrating photocurrents resulting from the detection of two spectral bands. A readout circuit (20) in accordance with this invention performs a subtraction function, and includes a differential charge-sensing amplifier (22) in a one-per-column arrangement. The amplifier works in cooperation with circuitry (M5) located in each unit cell. The subtraction function is employed to create a separate Band1 signal from a Band2 and (Band1+Band2) signals generated by each simultaneous two-color detector (1). One significant advantage of the disclosed circuit embodiment is that it offers low spectral crosstalk between the two spectral bands.

REFERENCES:
patent: 5043820 (1991-08-01), Wyles et al.
patent: 5113076 (1992-05-01), Schulte
patent: 5149956 (1992-09-01), Norton
patent: 5380669 (1995-01-01), Norton
patent: 5457331 (1995-10-01), Kosai et al.
patent: 5523570 (1996-06-01), Hairston
patent: 5559336 (1996-09-01), Kosai et al.
patent: 5581084 (1996-12-01), Chapman et al.

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