Forward and reverse VSWR insensitive power detection using phase shifting and harmonic filtering

摘要

A system for detecting both forward and reverse power of a power amplifier in the presence of harmonics created by the power amplifier is provided. A forward power detection system receives detection signals from an in-phase amplifier leg and a quadrature-phase amplifier leg of the power amplifier. The forward power detection system applies a phase shift to the detection signals such that forward components of the detection signals are essentially in-phase, and reverse components of the detection signals are essentially 180 degrees out-of-phase. The phase shifted detection signals are then combined and filtered to provide a signal indicative of forward power. In a similar fashion, a reverse power detection system applies a phase shift to the detection signals to provide a signal indicative of reverse power.