Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2011-08-02
2011-08-02
Payne, David C. (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S297000, C375S284000, C375S285000, C375S254000, C455S114200, C455S114300
Reexamination Certificate
active
07991071
ABSTRACT:
A transmitter includes a polar modulator that creates phase and amplitude signals which in turn drive a power amplifier. To compensate for AM to PM conversion of the amplitude signal into the amplified signal, a compensation signal is generated from the amplitude signal and combined with the phase signal such that when amplified, the compensation signal cancels the AM to PM conversion. The compensation signal may have an offset term, a linear term, a quadratic term, and a cubic term. A second embodiment comprises a technique by which AM to AM conversion may concurrently be addressed using a second compensation signal.
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Payne David C.
RF Micro Devices, Inc.
Withrow & Terranova, P.L.L.C.
Wong Linda
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