Noise reduction circuit with a main signal path and an auxiliary

Details Noise reduction circuit with a main signal path and an auxiliary Noise reduction circuit with a main signal path and an auxiliary

1991-12-20

1993-05-04

Mullins, James B.

Amplifiers

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

303 14, H03F 126

Patent

active

052085511

ABSTRACT:
In a noise reduction circuit with a main signal path and an auxiliary signal path having a high-pass filter characteristic, the noise reduction circuit comprises: a voltage-to-current converting circuit having a differential input and output and connecting the auxiliary signal path to the main signal path, PN junction transistors connected to the differential output of the voltage-to-current converting circuit, a paired common-emitter transistor arrangement having one base electrode connected to the PN junction transistors, a capacitance connected to a first differential input of the voltage-to-current converting circuit, a feedback resistor connecting a collector of a first common-emitter transistor pair of the paired common-emitter transistor arrangement to the first differential input of the voltage-to-current converting circuit, a voltage buffer having the collector of the first common-emitter transistor pair of the paired common-emitter transistor arrangement and a voltage dividing resistance connected to a first differential input terminal, and an operational circuit for summing the auxiliary signal and main signal outputs. Accordingly, the circuit can minimize the layout area of an integrated circuit.

REFERENCES:
patent: 4547741 (1985-10-01), Katakura

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