Noise and drift correcting amplifier circuit for a live-scan ima

Details Noise and drift correcting amplifier circuit for a live-scan ima Noise and drift correcting amplifier circuit for a live-scan ima

1975-08-11

1977-07-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250559, H01J 3912

Patent

active

040367630

ABSTRACT:
In an imaging system, a radiation detector which scans an image has it output amplified by a D.C. preamplifier and to neutralize low frequency noise and drift the preamplifier output is amplified by a further D.C. amplifier having a feedback capacitor and to which a reference voltage is applied the further amplifier output being applied as a second input to the preamplifier. A sample and hold switch controls the application of the preamplifier output to the further amplifier, this switch being closed only during the dead times between consecutive scan lines.

REFERENCES:
patent: 3744913 (1973-07-01), Farthing et al.
patent: 3789215 (1974-01-01), Penny
patent: 3820068 (1974-06-01), McMillin
patent: 3863066 (1975-01-01), Liedholz
patent: 3927317 (1975-12-01), Liedholz

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