Electronically tuned power amplifier

Details Electronically tuned power amplifier Electronically tuned power amplifier

2007-02-27

2007-02-27

Nguyen, Patricia (Department: 2817)

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

C330S053000, C330S286000

Reexamination Certificate

active

11167639

ABSTRACT:
A power amplifier apparatus that includes a main power amplifier circuit and an injection power amplifier circuit is provided. The main amplifier includes a pair of quadrature coupled amplifiers. Similarly, the injection power amplifier also includes pair of quadrature coupled amplifiers. The output signal from the injection amplifier is connected to the isolation port of the quadrature coupler of the main amplifier. The input signal is split and applied to the inputs of both the main and injection amplifiers. The gain and phase through the injection amplifier is adjusted in order to vary the magnitude and phase of the signal injected into the isolation port of the quadrature combiner of the main amplifier. By varying the magnitude and phase of the injected signal, the impedance seen by the individual amplifiers within main amplifier can be controlled. Controlling these impedances allows the properties of the main amplifier to be dynamically varied.

REFERENCES:
patent: 4725842 (1988-02-01), Mayberry
patent: 6115593 (2000-09-01), Alinikula et al.
patent: 6326841 (2001-12-01), Laureanti
patent: 6806768 (2004-10-01), Klaren et al.
patent: 7068104 (2006-06-01), Burns et al.

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