Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1982-06-10
1984-08-07
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330110, 330265, H03F 330
Patent
active
044646348
ABSTRACT:
An audio power amplifier includes an input amplifier stage and an output power amplifier stage. The output power amplifier stage comprises a p-channel field effect transistor and an n-channel field effect transistor having interconnected drain electrodes forming an output signal terminal. A driver circuit is provided for driving the p-channel and n-channel field effect transistors in a transconductance mode of operation in which the output current through the field effect transistors is directly proportional to the input voltage applied to the output amplifier stage. A first feedback path is provided between the output power amplifier stage and the input amplifier stage. A second feedback path is formed between the output and input of the input amplifier stage.
REFERENCES:
patent: 3392341 (1968-07-01), Burns
patent: 3822408 (1974-07-01), Veranth
patent: 3984782 (1976-10-01), Shizuhara
patent: 4015212 (1977-03-01), Miyata
patent: 4021747 (1977-05-01), Todokoro
patent: 4159450 (1979-06-01), Hoover
patent: 4241313 (1980-12-01), Takehara
patent: 4349788 (1982-09-01), Sondermeyer
Konrath, "MOSFET Pairs Simplify Audio-Amplifier Design," Electronic Design, Aug. 2, 1980, vol. 28, No. 16, pp. 25-29.
Mullins James B.
VSP Labs, Inc.
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