Trimming of operational amplifier gain

Details Trimming of operational amplifier gain Trimming of operational amplifier gain

1990-11-14

1991-07-23

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330282, H03G 300

Patent

active

050346997

ABSTRACT:
A method of adjusting the gain of an operational amplifier using a digital-to-analog converter (DAC) based upon R-2R resistive ladder technology inserts the DAC between the output of the operational amplifier and the non-inverting input to form a positive feedback loop. Variations of a digital control code applied to the DAC to control the gain are not affected by corresponding variations in the output resistance of the DAC so that undesirable changes in the magnitude of output noise, drift, bandwidth and offset voltage are minimized.

REFERENCES:
patent: 4918397 (1990-04-01), Kidger

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