Signal conditioning circuit

Details Signal conditioning circuit Signal conditioning circuit

1977-07-05

1978-09-26

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

328163, 328165, 330151, H03F 126

Patent

active

041174143

ABSTRACT:
A signal conditioning circuit for extracting unipolar noise from an analog input signal by isolating the unipolar noise component and subtracting it from the input signal. The circuit includes a coupling capacitor receiving the analog signal and an ideal clamp connected to the capacitor output terminal to clamp the capacitor to an edge of the unipolar noise signal. The capacitor is thus prevented from charging toward a level representing an average value of the unipolar noise and hence functions to pass the noise undistorted for subtraction from the analog input signal. The clamp comprises an operational amplifier having a first input terminal connected to the capacitor output terminal and a second input terminal connected to a source of reference voltage. A diode is connected in a feedback path between an output terminal of the amplifier and the first input terminal thereof.

REFERENCES:
patent: 3238383 (1966-03-01), Falk

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