Transmitter and power amplifier therefor

Details Transmitter and power amplifier therefor Transmitter and power amplifier therefor

1994-08-15

1995-11-21

Mottola, Steven

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

455126, H03G 320

Patent

active

054691052

ABSTRACT:
A transmitter comprises a linearized power amplifier circuit consisting of a power amplifier output stage having a feedback loop connected between its output and input. The feedback loop includes a coupler, a first gain control element and a feedback function stage which collectively determine the loop gain of the amplifier. A second gain control element is provided in the forward gain path of the power amplifier. The first and second gain control elements are controlled so that the product of their gains is constant. As a result the loop parameters remain substantially constant as the power setting is varied.

REFERENCES:
patent: 4563775 (1986-01-01), Yokosuka
patent: 5066923 (1991-11-01), Gailus et al.
patent: 5126686 (1992-06-01), Tam
patent: 5170495 (1992-12-01), McNicol et al.

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