Circuit for trimming input offset voltage utilizing variable res

Details Circuit for trimming input offset voltage utilizing variable res Circuit for trimming input offset voltage utilizing variable res

1991-05-03

1992-07-21

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307491, 3072993, H03K 522

Patent

active

051325594

ABSTRACT:
A circuit for trimming the input offset voltage of an input stage of an op amp includes variable resistors (20, 24) for providing variable voltages in series with the input voltage of the op amp. The voltage drop across the variable resistors is adjusted to compensate for any base-emitter voltage mismatches of the input transistors (12, 14) thereby making the input offset voltage of the op amp equal to zero. Further, the variable resistors can be replaced by resistive networks (40, 42) such that the resistive networks can be adjusted to provide an input stage with a zero temperature coefficient as well as a zero input offset voltage.

REFERENCES:
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patent: 4568840 (1986-02-01), Kenji
patent: 4577121 (1986-03-01), Sano et al.
patent: 4902984 (1990-02-01), Vinn et al.

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