Patent ID: 8045643
Filing Date: 2011-10-25
Classification: H03F

Abstract:
1. A power detection system for detecting output power of quadrature power amplifier circuitry comprising: a) first quadrature downconversion circuitry having a first input coupled to an output of an in-phase amplifier circuit of the quadrature power amplifier circuitry to receive an in-phase output signal and a second input coupled to an output of a quadrature-phase amplifier circuit of the quadrature power amplifier circuitry to receive a quadrature-phase output signal, and adapted to: b) second quadrature downconversion circuitry having a first input coupled to the output of the in-phase amplifier circuit of the quadrature power amplifier circuitry to receive the in-phase output signal and a second input coupled to the output of the quadrature-phase amplifier circuit of the quadrature power amplifier circuitry to receive the quadrature-phase output signal, and adapted to: c) circuitry adapted to selectively combine the first, second, third, and fourth downconverted signals to provide at least one of a group consisting of: a signal indicative of forward power and a signal indicative of reverse power.