A Radio Frequency RF transmitter includes a translational loop architecture that
supports non-constant envelope modulation types and includes by adjusting the envelope
of the translational loop at the translational loop output. The RF transmitter
includes a phase equalizer, an Intermediate Frequency (IF) modulator, a translational
loop, an envelope time delay adjust block, an envelope adjust block, and a time
delay calibration block. The phase equalizer receives a modulated baseband signal
and phase equalizes the modulated baseband signal to produce a phase equalized
modulated baseband signal. The IF modulator receives the phase equalized modulated
baseband signal and produces a modulated IF signal having a non-constant envelope.
The translational loop receives the modulated IF signal and produces a modulated
RF signal having a constant envelope. The envelope time delay adjust block receives
an envelope signal corresponding to the original modulated signal and produces
a time delayed envelope signal based upon a time delay control signal. The envelope
adjust block adjusts the modulated RF signal based upon the time delayed envelope
signal to produce an envelope adjusted modulated RF signal. Finally, the time delay
calibration block receives the envelope adjusted modulated RF signal and produces
the time delay control signal.