Patent ID: 7999613

Claim:
An amplifier system, comprising: an input conditioning circuit; at least first and second switchable amplifiers in parallel with each other and having an input and an output, an input signal coupled to the inputs of the at least the first and second amplifiers, each of the first and second amplifiers configured to be independently switchable on and off and combinable while retaining an analog pass transfer function and to maintain a desired load impedance on all amplifiers an equivalent load impedance can be switched across the output of the off amplifiers, wherein PAE is kept high at lower power levels and reduces average power taken from a power supply, and a high degree of isolation is maintained between outputs of the first and second amplifiers to provide outputs with no more than a 10% loss in PAE; a multi-input power combiner, wherein the outputs of the at least first and second parallel amplifiers are combined by the multi-input power combiner to add signals of the outputs constructively.