Patent ID: 7372917

Claim:
An RF transmitter, comprising: digital processor including a digital signal generation block for producing outgoing digital IF signals comprising an envelope magnitude component and a phase component wherein the envelope magnitude component is produced onto an envelope signal path and wherein the phase component is produced on a phase signal path; wherein the digital processor further includes: time shift signal determination logic that produces a time shift signal based upon a bleed over power level in an adjacent channel, which bleed over power level is a function of downstream phase and magnitude mismatch of a primary signal; and a time shift block operably coupled to receive one of the envelope magnitude component and the phase component from the digital signal generation block, wherein the time shift block generates a time shift in at least one of the envelope signal path and the phase signal path based upon the time shift signal, the time shift block further including: signal frequency shift block for shifting the filtered digital signal to a zero frequency baseband signal; rotation angle block for producing a rotation angle to the signal frequency shift block wherein the rotation angle block shifts the filtered analog signal to an adjacent channel frequency; an adjacent channel power block for producing an estimate of adjacent channel power; and a time shift optimization block for producing the time shift signal based on an optimized value of the estimated adjacent channel power; first and second digital-to-analog converters (DACs) in the envelope signal path and phase signal path, respectively, coupled to receive the envelope magnitude component and phase component of the magnitude and phase signal paths, respectively, the first and second DACs producing outgoing analog envelope and phase components, respectively; first and second low pass filters for producing filtered outgoing magnitude and phase components, respectively, based upon the outgoing magnitude and phase components; translational loop for up-converting the filtered outgoing phase component from IF to RF to produce an outgoing RF phase component; power amplifier that produces an outgoing modulated RF signal based upon the outgoing RF phase component having an outgoing power level based upon the filtered outgoing magnitude component; and a feedback loop for producing a feedback signal from the outgoing modulated RF signal to the time shift signal determination block wherein the feedback signal comprises a filtered digital signal.