Audio power amplifier

Details Audio power amplifier Audio power amplifier

1975-08-21

1980-12-23

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330264, 330269, 330277, H03F 316

Patent

active

042413133

ABSTRACT:
An audio power amplifier comprising a first stage voltage amplifier circuit, a second stage voltage amplifier circuit and a last stage power amplifier circuit. The first stage voltage amplifier circuit is of differential amplifier type including a pair of field effect transistors for voltage amplifying an audio frequency signal. The second stage voltage amplifier circuit includes a field effect transistor for voltage amplifying the output signal from the first stage voltage amplifier circuit. The second stage voltage amplifier circuit also serves as a drive stage. The last-stage power amplifier circuit includes a pair of field effect transistors having drain voltage versus drain current characteristics similar to static plate voltage versus plate current characteristics of a triode vacuum tube for power amplifying the output signals of the second stage voltage amplifier circuit.

REFERENCES:
patent: 3376388 (1968-04-01), Reiffin
patent: 3392341 (1968-07-01), Burns
patent: 3760288 (1973-09-01), Leonard
patent: 3862367 (1975-01-01), Kono et al.

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