Charge amplifier with minimum offset voltage

Details Charge amplifier with minimum offset voltage Charge amplifier with minimum offset voltage

1978-11-08

1981-06-16

Heyman, John S.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

328127, 328165, 330 9, H03F 370, H03F 372, H03F 108

Patent

active

042740568

ABSTRACT:
A charge amplifier having minimum offset voltage such as for use in processing a signal from a capacitive transducer. The amplifier is arranged to minimize the offset voltage and drift. The amplifier is arranged to be reset to zero upon application of supply voltage thereto, and the resetting circuit is arranged to reset the amplifier automatically during an adjustable interval after application of the supply voltage. The charge amplifier is further compensated for temperature variation and is arranged at minimum offset voltage notwithstanding strong background noise.The amplifier is arranged to have a drift of no more than a fraction of a millivolt per second. The amplifier circuit includes an improved switching arrangement and may utilize a second amplifier circuit for effecting temperature compensation.

REFERENCES:
patent: 2970266 (1961-01-01), Molloy et al.
patent: 3469197 (1969-09-01), Ryan
patent: 3502983 (1970-03-01), Ingle et al.
patent: 3654560 (1972-04-01), Cath et al.
patent: 3801919 (1974-04-01), Wilkes et al.
patent: 4068165 (1978-01-01), Labinsky et al.
patent: 4119918 (1978-10-01), Moser

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