Power amplifying apparatus for optical disk apparatus

Details Power amplifying apparatus for optical disk apparatus Power amplifying apparatus for optical disk apparatus

1988-11-29

1991-02-12

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

307273, 330 51, H03G 320, H03K 3284

Patent

active

049927582

ABSTRACT:
A power amplifying apparatus for amplifying an input signal to drive a load, includes an amplifier for amplifying the input signal so as to generate an output signal for driving the load and a current/voltage converter for current/voltage converting the output signal generated by the amplifier and feeding back the converted voltage to the amplifier. The converted voltage is used to control the amplitude of the output signal which flows into the load. The power amplifying apparatus further includes a circuit for determining a current-to-voltage conversion ratio of the current/voltage converter. The amplitude of the converted voltage converted by the current/voltage converter may be varied in accordance with the current-to-voltage converting ratio determined by the determining circuit.

REFERENCES:
patent: 3875523 (1975-04-01), Wade et al.
patent: 3988685 (1976-10-01), Hughes
patent: 4004190 (1977-01-01), Simpson
patent: 4223273 (1990-09-01), Yokoyama
patent: 4260954 (1981-04-01), Crooks
West German Office Action dated Jun. 14, 1989 for Application Ser. No. P 38 40 234.3-31.

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