Patent ID: 7480344

Claim:
An RF transmitter, comprising: digital processor for producing an outgoing digital signal comprising an envelope component and a phase component wherein the envelope component is produced onto an envelope signal path and wherein the phase component is produced on a phase signal path; delay calibrator for producing a delay signal based on a feedback signal and the envelope component; envelope detector for producing an envelope signal based on the envelope component; delay block to delay the envelope signal based on the delay signal; wherein the delay calibrator further includes: first and second phase detectors for detecting a zero crossing of the outgoing digital signal and for detecting a zero crossing of the feedback signal, respectively; first summing node for producing a phase component error signal based on a difference between the zero crossing of the feedback signal and the zero crossing of the outgoing digital signal; phase delay block for delaying the zero crossing of the feedback signal wherein delaying the zero crossing of the feedback signal substantially aligns the zero crossing of the feedback signal with the zero crossing of the outgoing digital signal; delay envelope detector for producing a delayed envelope control signal based on the delayed feedback signal; and second summing node for producing the delay signal based on a difference between the delayed envelope control signal and the envelope signal; translational loop for up-converting the outgoing digital signal to an RF signal; and power amplifier that produces an outgoing modulated RF signal based upon the RF signal and the delayed envelope signal.