Patent ID: 8331487

Claim:
An RF predistortion apparatus comprising: an RF input line for carrying an RF signal; a coefficient vector input bus for carrying a coefficient vector comprising a plurality of coefficient signals each representing a coefficient; an RF predistortion processor, comprising: (a) a digitally controlled analog subsystem (DCAS) receiving an envelope signal representing a signal envelope of the RF signal and the coefficient vector; the DCAS generating first and second weight signals, V p (t) and V q (t), each representing a polynomial function of the RF input signal; and (b) a quadrature modulator coupled to the RF signal line and the DCAS to receive the RF input signal and the first and second weight signals, the quadrature modulator providing a predistortion signal representing a sum of in-phase and quadrature signals derived from the RF input signal, respectively weighted by the first and second weight signals; and an RF delay element coupled to the RF input line to provide a delayed RF input signal; an RF coupler coupling the predistortion signal and the delayed RF input signal to provide a predistorted input signal to a power amplifier.