Patent ID: 7379714
Filing Date: 2008-05-27
Classification: H03F,H03G,H04B,H04W,Y02D

Abstract:
1. A transmitter comprising: a power amplifier (PA) configured to amplify an input signal; an antenna configured to transmit a signal amplified by the PA; an impedance matching network having an input in communication with the PA and an output in communication with the antenna, the impedance matching network configured to match an output impedance of the PA to an input impedance of the antenna, the impedance matching network including at least one impedance adjustment device; a first power detector configured to measure, at the output of the impedance matching network, a forward power level from the PA output; a second power detector configured to measure, at the output of the impedance matching network, a reverse power level reflected back from the antenna; a first analog-to-digital converter (ADC) coupled to the first power detector, the first ADC configured to convert the forward power level measurement to a digital forward power level measurement; a second ADC coupled to the second power detector, the second ADC configured to convert the reverse power level measurement to a digital reverse power level measurement; a digital-to-analog converter (DAC) coupled to the impedance adjustment device; and a processor, coupled to the first and second ADCs and the DAC, the processor configured to receive the digital power level measurements via the ADCs, and adjust the impedance adjustment device based on the digital power level measurements by sending a feedback signal to the impedance adjustment device via the DAC.