Patent ID: 8112047

Claim:
A radio frequency (RF) transmitter comprises: a Cartesian to polar conversion module, when enabled, coupled to convert an in-phase component and a quadrature component of an outbound symbol stream into a polar coordinate; a polar coordinate compensation module, when enabled, coupled to compensate the polar coordinate based on at least one of timing errors, amplitude distortion, and phase distortion to produce a compensated polar coordinate, wherein the polar coordinate compensation module includes: a phase compensation module coupled to compensate the phase distortion of phase modulation information of the polar coordinate to produce compensated phase modulation information; an amplitude compensation module to compensate the amplitude distortion of amplitude modulation information of the polar coordinate to produce compensated amplitude modulation information; and a time adjust module coupled to substantially synchronize the compensated amplitude modulation information and the compensated phase modulation information to produce the compensated polar coordinate; a phase locked loop (PLL) coupled to: generate an oscillation when the RF transmitter is in a Cartesian mode; and generate a phase modulated oscillation in accordance with phase modulation information of the compensated polar coordinate when the RF transmitter is in a polar mode; an IQ up-conversion section coupled to: mix an in-phase component of a local oscillation with the in-phase component to produce a first mixed signal when the RF transmitter is in the Cartesian mode, wherein the local oscillation is derived from the oscillation; mix a quadrature component of the local oscillation with the quadrature component to produce a second mixed signal when the RF transmitter is in the Cartesian mode; and combine the first and second mixed signals to produce a Cartesian based up-converted signal when the RF transmitter is in the Cartesian mode; a power amplifier module coupled to: amplify the Cartesian based up-converted signal to produce an outbound RF signal when the RF transmitter is in the Cartesian mode; and amplify a polar based up-converted signal to produce the outbound RF signal when the RF transmitter is in the polar mode, wherein the polar based up-converted signal is based on the phase modulated oscillation and amplitude modulation information of the compensated polar coordinate.