Patent ID: 7953380

Claim:
A transmitter system that produces an amplified output signal S out from an amplitude modulated input signal S with low frequency base band and analog amplification at an RF frequency, comprises: a signal separator that decomposes the input signal S into two phase modulated envelope signals S 1 and S 2 at the same low frequency and transmitted along 2n+2 total parallel branches (n=0.1, 2, . . . ), at least one RF non-linear power amplifier in each said branch, a combiner produces a substantially linear output signal S out from the amplified envelope signals S 1 and S 2 , and a signal processor, including said signal separator, that optimizes the operation of said amplifiers as a function of the phase angle θ of the separated input signal S, wherein said signal processor includes switches associated with each of said branches, and said amplifier in each said branch associated with one of said envelope signals S 1 and S 2 comprises a high gain amplifier, and n low gain amplifiers (n≧1), wherein each of said high and low gain amplifiers is associated with an optimized θ value, θi (1≦i≦n), and wherein said switches turn on two of said RF amplifiers selected by said signal processor, and each associated with one of said envelope signals S 1 and S 2 to optimize the linearity and efficiency of said amplifiers for a given input signal S.