Patent ID: 8112045

Claim:
A Radio Frequency (RF) transmitter comprising: an Intermediate Frequency (IF) modulator that receives a modulated baseband signal and that produces a modulated IF signal having a non-constant envelope; a translational loop that receives the modulated IF signal and that produces a modulated RF signal having a constant envelope; an envelope time delay adjust block that receives an envelope signal corresponding to the modulated IF signal and that produces a time delayed envelope signal based upon a time delay control signal, the time delayed envelope signal being delayed in time with respect to the envelope signal by an amount corresponding to a delay introduced by at least the translational loop; an envelope adjust block coupled to an output of the translational loop that adjusts the modulated RF signal based upon the time delayed envelope signal to produce an envelope adjusted modulated RF signal that has a non-constant envelope; and a time delay calibration block that receives the envelope adjusted modulated RF signal and that produces the time delay control signal.