Patent 8928356 was granted and assigned to Skyworks Solutions, Inc. on January, 2015 by the United States Patent and Trademark Office.
In a portable radio transceiver, a power amplifier system includes a saturation detector that detects power amplifier saturation in response to duty cycle of the amplifier transistor collector voltage waveform. The saturation detection output signal can be used by a power control circuit to back off or reduce the amplification level of the power amplifier to avoid power amplifier control loop saturation.