Amplification circuit which includes an input-current compensati

Details Amplification circuit which includes an input-current compensati Amplification circuit which includes an input-current compensati

1997-11-12

1999-12-07

Pascal, Robert

Amplifiers

With d.c. reinsertion circuit

348707, H03F 2100, H03K 302

Patent

active

059990457

ABSTRACT:
An amplification circuit comprising a device for compensating for its input current. The amplification circuit includes an amplifier and a capacitor located on the input side of the amplifier. The input-current compensation device consists of a current generator, generating a current Ig, a switch and a device for measuring the average current charging or discharging the capacitor during the time that the switch is open. The current Ig is such that: Average current=Ia-Ig, where Ia is the input current of the amplifier. The value of the average current is close to zero. The value of the current Ig which the current generator must output, so as to make the average current close to zero, is calculated using the device for measuring the average current. The invention particularly applies to a circuit for restoring the DC component of a video signal.

REFERENCES:
patent: 3207998 (1965-09-01), Corney et al.
patent: 3551596 (1970-12-01), Borenstein
patent: 3609230 (1971-09-01), Paine
patent: 3811053 (1974-05-01), Habib
patent: 4242640 (1980-12-01), Bean
patent: 4296437 (1981-10-01), Geurts
patent: 4544951 (1985-10-01), Yoshisato
patent: 4644198 (1987-02-01), Ahmed
4644198 (Ahmed) "Signal Clamp" Feb. 17, 1987 JP 61109376 May 27, 1986.

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