Equalizing circuit

Details Equalizing circuit Equalizing circuit

1987-03-06

1988-07-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330 86, 330107, 330282, H03G 320

Patent

active

047557710

ABSTRACT:
An equalizer circuit for equalizing a signal attenuated in frequency while the same is transmitted through a transmission line and eliminates out-band high frequency noise so as to provide a signal having flat frequency characteristics. The equalizing circuit includes a high-pass circuit, a Sallen-Key low-pass circuit capable of gain regulation, constructed by connecting the output terminal of an operational amplifier through a resistance to the negative input terminal of the same and grounding the negative input terminal through a variable resistance, an amplifying circuit capable of gain control for amplifying a signal supplied to the positive input terminal of the operational amplifier of the Sallen-Key low-pass circuit, and a control circuit which detects the peak level of the output signal of the amplifying circuit and controls the resistance of the variable resistance of the Sallen-Key low-pass circuit and the gain of the amplifying circuit on the basis of the result of the detection.

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