Reduced distortion radio frequency amplifiers
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United States of America Patent
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N/A
Issued Date -
Jan 29, 2009
app pub date -
Jul 25, 2008
filing date -
Jul 25, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A radio frequency power amplifier system includes a power amplifier coupled to an input signal and configured to provide an output signal at a radio frequency; a signal cancellation system coupled to the input signal, and a first feedback signal, which is based on the output signal, and configured to provide an error signal with a reduced level of the input signal; and a feedback control system coupled to the error signal and configured to provide a correction signal that is used to reduce distortion in the output signal. A corresponding method includes amplifying in a forward path an input signal to provide an output signal at a radio frequency; combining a reference and a first feedback signal to provide an error signal with a reduced level of the input signal; providing, responsive to the error signal and in a. feedback control system that is separate from the forward path, a correction signal; and then using the correction signal to reduce distortion in the output signal.
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