WASTE ENERGY CONTROL MANAGEMENT FOR POWER AMPLIFIER

摘要

An amplifying apparatus for linearly amplifying a desired signal using a pair of coupled non-linear amplifiers (57) is disclosed. The amplifying apparatus comprises a limiter (21) for separating amplitude variations from the desired signal and producing a constant amplitude signal bearing the phase of the desired signal and an amplitude related signal. In addition, a drive signal generator (62) produces two drive signals each dependent on the constant amplitude signal and the amplitude related signal such that each drive signal depends on the phase of the desired signal and such that the sum of the squares of the amplitudes of the drive signals is constant. Finally, a coupler (56) couples the two drive signals to produce two constant amplitude signals for driving the pair of non-linear power amplifiers (57) and for coupling the outputs of the power amplifiers (57) to produce two amplified output signals, one of which is the linearly amplified desired signal and the other of which is a waste energy signal.