Offset adjustment circuit

Details Offset adjustment circuit Offset adjustment circuit

1976-06-25

1977-09-20

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 30D, 330 35, H03F 316, H03F 345

Patent

active

040500306

ABSTRACT:
An offset adjustment circuit for a differential amplifier includes a current source connected in series with a resistor for establishing a biasing voltage for a pair of field effect transistors (FET) having variable resistors in their biasing circuits. These FET's are connected to introduce currents respective connections between an input stage and a second stage of the differential amplifier. The difference of the currents supplied by the FET's divided by the transconductance of the input stage of the differential amplifier corresponds to an offset which remains fixed with changes in temperature. The offset introduced by the FET's, as determined by the adjusted values of the resistors in their biasing circuits, may be in opposition to the offset of the differential amplifier to either reduce it partially or completely, or it may be additive to the offset of the differential amplifier, as desired.

REFERENCES:
patent: 3742377 (1973-06-01), Dobkin

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