Power amplifier whose bias voltage changes depending on power su

Details Power amplifier whose bias voltage changes depending on power su Power amplifier whose bias voltage changes depending on power su

1979-07-25

1981-09-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

042900263

ABSTRACT:
A power amplifier whose bias voltage changes depending on the power supply voltage comprises a first amplifier with an input terminal and a feedback terminal. A second amplifier amplifies the output of the first amplifier, and the output of the second amplifier is fed back to the feedback terminal of the first amplifier. A bias circuit is connected between the power supply terminals and provides a bias to the input terminal of the first amplifier. The bias circuit includes a series connection of a first constant voltage generating device, a first resistor, a second resistor, and a parallel connection of a second constant voltage generating device and a third resistor. The input terminal of the first amplifier is biased by a voltage depending on the voltage at a connection point between the first and second resistors.

REFERENCES:
patent: 3843935 (1974-10-01), Seki
patent: 3898576 (1975-08-01), Fukaya

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