Forward and reverse VSWR insensitive power detection using...

Details Forward and reverse VSWR insensitive power detection using... Forward and reverse VSWR insensitive power detection using...

2008-05-02

2011-10-25

Lugo, David (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C455S114300

Reexamination Certificate

active

08045643

ABSTRACT:
A system and method for detecting both the forward and reverse power of a power amplifier are provided. The power amplifier is a quadrature power amplifier including an in-phase amplifier circuit and a quadrature-phase amplifier circuit. A radio frequency (RF) input signal is split and phase-shifted to provide an in-phase RF input to the in-phase amplifier circuitry and a quadrature-phase RF input to the quadrature-phase amplifier circuitry, where the quadrature-phase RF input is +90 degrees out-of-phase with the in-phase RF input. In one embodiment, a power detection system operates to downconvert quadrature output signals from the in-phase and quadrature-phase amplifier circuits based on quadrature local oscillator signals. The outputs of the quadrature downconversion are then selectively combined to provide a quadrature signal indicative of forward power, a quadrature signal indicative of reverse power, or both a quadrature signal indicative of forward power and a quadrature signal indicative of reverse power.

REFERENCES:
patent: 5913154 (1999-06-01), Wynn
patent: 7379714 (2008-05-01), Haque et al.
patent: 7555276 (2009-06-01), Wilcox
patent: 7656964 (2010-02-01), DeCoste et al.

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