Radiant energy – Infrared-to-visible imaging – Including detector array
Patent
1988-02-03
1989-09-19
LaRoche, Eugene R.
Radiant energy
Infrared-to-visible imaging
Including detector array
2503384, 330 9, 330 51, 330253, G01J 504
Patent
active
048689025
ABSTRACT:
An integrating transimpedance amplifier 10 comprises a differential amplifier constructed of GaAs, MESFET, HEMT, SDHT or MODFET transistors has an input coupled to the output of a radiation detector 12 and an output expressive of the detector signal integrated over a predetermined interval of time. The amplifier has a transistor Q0 coupled to the input for coupling the input periodically to a predetermined voltage potential and a transistor Q.sub.9 coupled to the output of the amplifier for simultaneously periodically coupling the output to a predetermined voltage reference, thereby initializing the amplifier at the beginning of an integration period. A buffer transistor Q.sub.4 couples the output of the amplifier to a GaAs MISFET switch Q.sub.8 which is periodically activated to couple the buffered amplifier output to a storage capacitor Csmp. The buffer transistor also couples the output of the amplifier to a feedback capacitor Cf which is connected between the output of the buffer amplifier and the input of the amplifier for minimizing an effect associated with the radiation detector parasitic capacitance. The magnitude of the buffered amplifier output is stored on the capacitor at the beginning and end of the integration period. The sample signal is read out by a multiplexer twice during the integration period, the difference between the initial and final value of the buffer amplifier output being indicative of the radiation impinging on the detector minus one or more noise components.
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Ham Seung
Hughes Aircraft Company
Karambelas A. W.
LaRoche Eugene R.
Streeter W. J.
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