Telecommunications – Transmitter
Reexamination Certificate
2005-07-27
2008-10-21
Nguyen, Simon D (Department: 2618)
Telecommunications
Transmitter
C455S126000, C455S127100
Reexamination Certificate
active
07440731
ABSTRACT:
A radio frequency (“RF”) power amplifier circuit as described herein is configured to detect and measure an output load mismatch and to adjust the operating characteristics of the RF power amplifier to reduce output signal distortion. The circuit includes a directional RF signal coupler that obtains a coupled reflected RF signal that is indicative of the output load mismatch. The coupled reflected RF signal is processed to generate one or more bias control signals for the RF power amplifier. In operation, a mismatch condition will result in a measurable coupled reflected RF signal and a corresponding reduction in output power from the RF power amplifier. Ultimately, the output power control mechanism strives to maintain the RF power amplifier within a linear operating range.
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Gilsdorf Benjamin R.
Newman David A.
Norris George B.
Sadowniczak Gary W.
Sherman Richard E.
Freescale Semiconductor Inc.
Ingrassia Fisher & Lorenz P.C.
Nguyen Simon D
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