System for compensating the offset voltage of a differential amp

Details System for compensating the offset voltage of a differential amp System for compensating the offset voltage of a differential amp

1980-12-23

1983-07-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

043956815

ABSTRACT:
A system is disclosed for compensating for the offset voltage problem which occurs in certain types of differential amplifiers; a differential amplifier, in the form of an operational amplifier, is provided with two generators of input signals whose difference is to be amplified; further included is an offset voltage compensation loop comprising a comparator, an n-bit up/down counter and a digital analog converter means; the output of said means being connected to said generators of input signals so as to modulate the input signals; and said digital analog converter means including first and second n-1 bit digital analog converters.

REFERENCES:
patent: 4229703 (1980-10-01), Bustin

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