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 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 IF
modulator receives a 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.
