Method and apparatus for controlling gain of a power amplifier

Details Method and apparatus for controlling gain of a power amplifier Method and apparatus for controlling gain of a power amplifier

1997-07-31

1999-04-06

Mottola, Steven

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330136, H03G 320

Patent

active

058923969

ABSTRACT:
A method and apparatus for controlling the gain of a power amplifier wherein the method includes the steps of attenuating, detecting, and comparing. An attenuator (108) attenuates an amplified version of a radio frequency signal to an attenuated level. A single detector (109) alternatively detects the radio frequency signal power level at a power amplifier (101) input and the attenuated version of the amplified radio frequency signal. The detector (109) produces a first and a second signal each having a DC level representing the detected power levels. An operation amplifier configured for closed loop operation compares the DC levels of the first and second signals to produce a control signal (102) for controlling power amplifier (101) gain. Filters (119) and (120) filter the first and second signals before the comparing step.

REFERENCES:
patent: 3900823 (1975-08-01), Sokal et al.
patent: 5374896 (1994-12-01), Sato et al.

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