Bias control circuit for radio-frequency power amplifier

Details Bias control circuit for radio-frequency power amplifier Bias control circuit for radio-frequency power amplifier

1993-11-30

1995-04-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330130, 330296, 455127, H03G 330

Patent

active

054062250

ABSTRACT:
A bias control circuit for a radio-frequency power amplifier which performs linear power amplification of an intermittent radio-frequency signal. The control circuit includes a bias voltage setting circuit for supplying a bias voltage of a predetermined value to a power amplifying element during a time period in which substantially none of the radio-frequency signal is supplied to the power amplifying element, and for setting the idle current of the power amplifying element to a predetermined value. The control circuit further includes a sample and hold circuit for sampling and holding the bias voltage during the time period in which substantially none of the radio-frequency signal is supplied to the power amplifying element. The output voltage of the sample and hold circuit is supplied as a bias voltage to the power amplifying element during the subsequent time period of supply of the radio-frequency signal to the power amplifying element, whereby the idle current of the power amplifying element is stabilized despite any temperature fluctuation.

REFERENCES:
patent: 5128629 (1992-07-01), Trinh
patent: 5196806 (1993-03-01), Ichihara
patent: 5304947 (1994-04-01), Carlsson

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