Digital algorithm for on-line ACPR optimization in polar RF transmitters
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United States of America Patent
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May 13, 2008
Grant Date -
Mar 23, 2006
app pub date -
Sep 17, 2004
filing date -
Aug 25, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An RF transmitter includes a digital processor that includes a time shift signal determination block that produces a time shift signal based upon a bleed over power level in an adjacent channel resulting from downstream phase and magnitude mismatch of a primary signal. In one embodiment, the time shift signal determination block includes logic and circuitry for determining a power ratio for a primary signal between a bleed over power level in an adjacent channel and the primary channel. The time shift signal determination block produces the time shift signal to a time shift block that is operably coupled to receive one of an envelope magnitude component and a phase component from a 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.
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