Pre-amplifier in focal plane detector array

Details Pre-amplifier in focal plane detector array Pre-amplifier in focal plane detector array

1987-04-27

1988-12-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307491, H01J 4014

Patent

active

047912863

ABSTRACT:
Circuitry for a focal plane pre-amplifier is disclosed in which the input of the pre-amplifier is switched between the signal from its photo-detector and a connection to ground. During the ground-connected interval, the pre-amplifier transistor is temporarily diode-connected in such a way that the transistor's voltage is stored on a capacitor, which is connected between the incoming photo-detector signal and the input of the pre-amplifier transistor. During the photo-detector connected interval, the voltage stored on the capacitor is subtracted from the voltage signal supplied by the photo-detector.

REFERENCES:
patent: 4092611 (1978-05-01), Frederiksen et al.
patent: 4300062 (1981-11-01), Marshall, Jr.
patent: 4382187 (1983-05-01), Fraleux et al.
patent: 4393351 (1983-07-01), Gregorian et al.
patent: 4430622 (1984-02-01), Simoes
patent: 4473745 (1984-09-01), Chown
patent: 4567446 (1986-01-01), Konishi
patent: 4675532 (1987-06-01), Carson
patent: 4691125 (1987-09-01), Rybicki
Hsieh et al., "A Low-Noise Chopper-Stabilized Differential Switched-Capacitor Filtering Technique", IEEE, 1981, pp. 708-715.

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