Infrared image pickup device

Details Infrared image pickup device Infrared image pickup device

1996-06-05

1997-07-22

Fields, Carolyn E.

Radiant energy

Infrared-to-visible imaging

Including detector array

25037008, 25037015, H04N 533, G01J 506

Patent

active

056506228

ABSTRACT:
Circuitry for a bolometer-type image pickup device improves the signal-to-noise ratio and reduces variations of an output offset level due to temperature variations of the device. A clamp voltage is applied to an amplifier 18 via a clamping diode 36 connected thereto. This reduces a difference between an input voltage during an off-state of one of horizontal FET switches 9, 10, and an input voltage during the off-state of both horizontal FET switches 9, 10, thereby improving a signal-to-noise ratio by narrowing a frequency band of an external circuit. Further, a variable load resistor 43 whose resistance varies with temperature similarly to those of bolometers 1-4, a resistance of a pseudo resistor 44 which is substantially equal to a sum of conductive resistances of vertical FET switches 1, 14 and horizontal FET switches 9, 10, and a compensating diode 45 whose forward bias voltage varies with temperature similarly to those of pixel separating diodes 39-42 are connected in series between the horizontal FET switches 9, 10 and a bias current output terminal 12, thereby offsetting variations of an output offset level due to temperature variations.

REFERENCES:
patent: 4153835 (1979-05-01), Lau et al.
patent: 5021663 (1991-06-01), Hornbeck
patent: 5420419 (1995-05-01), Wood

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