Control signal amplification circuit

Details Control signal amplification circuit Control signal amplification circuit

1998-12-24

2000-11-14

Pascal, Robert

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330282, 360 46, H03F 136

Patent

active

061475548

ABSTRACT:
A control signal amplification circuit for amplifying a control signal reproduced by a control head. The control signal amplification circuit includes a level detection circuit for detecting an output level of an amplification circuit body having an amplification factor determined on the basis of the quantity of negative feedback to thereby send out a level control signal indicating a result of the detection, and a variable feedback resistance circuit which is connected between a minus-input terminal and an output terminal of the amplification circuit body so that the equivalent resistance value of the variable feedback resistance circuit decreases when the level control signal indicates the increase of the output level, and the equivalent resistance value of the variable feedback resistance circuit increases when the level control signal indicates the decrease of the output level, whereby the control signal is amplified without deformation of its waveform.

REFERENCES:
patent: 4450413 (1984-05-01), Fujibayashi
patent: 4755771 (1988-07-01), Sakaida et al.
patent: 4967163 (1990-10-01), Kietzer
patent: 5621353 (1997-04-01), Botti et al.

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