Precision switchable gain circuit

Details Precision switchable gain circuit Precision switchable gain circuit

1987-09-30

1989-08-08

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including gain control means

330 9, H03G 330

Patent

active

048556858

ABSTRACT:
A switchable gain circuit includes an operational amplifier (10) which has an input leg comprised of a series resistor (20) and an MOS transistor (22). A plurality of feedback legs are formed, each comprising one or more resistors that are equal in value to the input resistor (20), and connected in series with a switch transistor. The proportion of the series resistance of the transistor in a given feedback leg to the series resistance in the transistor in the input leg is equal to the proportion of the fixed resistance in the feedback leg and input leg. The value of the series resistance of the feedback transistors therefore factors out the series resistance of the input transistor (22) in the gain calculation. This significantly reduces harmonic distortion in the output signal.

REFERENCES:
patent: 4137466 (1979-01-01), Schemmel et al.
patent: 4500845 (1985-02-01), Ehni

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