Apparatus for and method of autozeroing the input of a charge-to

Details Apparatus for and method of autozeroing the input of a charge-to Apparatus for and method of autozeroing the input of a charge-to

1996-01-31

1998-05-26

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327341, 327 96, H03L 500

Patent

active

057572194

ABSTRACT:
The invention is an autozero compensator for use in processing low level signals, the compensator comprising an input integrating operational amplifier providing at its output in one mode an error signal responsively to offset voltage across the differential input terminals of the amplifier. A second amplifier is provided in a feedback loop for generating from the error signal a charge at a compensating voltage equal and opposite to the offset voltage. That charge is capacitively stored and applied to the input amplifier to cancel the offset voltage.

REFERENCES:
patent: 4031504 (1977-06-01), Mioduski
patent: 4163947 (1979-08-01), Weedon
patent: 4377759 (1983-03-01), Ohhata et al.
patent: 4393351 (1983-07-01), Gregorian et al.
patent: 4429282 (1984-01-01), Saari
patent: 4430622 (1984-02-01), Simoes
patent: 4578646 (1986-03-01), Maio et al.
patent: 4587443 (1986-05-01), Van De Plassche
patent: 5053770 (1991-10-01), Mayer et al.
patent: 5276367 (1994-01-01), Shibatani et al.

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