A multi-channel amplifier with Cartesian feedback

摘要

A "matrix" amplifier is arranged to flexibly amplify a plurality of signals with a plurality of amplifiers such that, for example, a group of amplifiers may be devoted to one signal. The phase of the amplifier inputs may be determined by using a form of Cartesian feedback. Various other arrangements are described including: deriving constant amplitude signals from varying amplitude signals (amplitude information contained in phases) for application to non-linear amplifiers to increase efficiency, and disposal (eg by radiation into a harmless direction) or recovery of energy of intermodulation products.