Patent ID: 8964881
Filing Date: 2015-02-24
Classification: H03F,H03M

Abstract:
1. A digital radio frequency (RF) power amplifier comprising: a first radio-frequency digital to analog converter (RFDAC) having a plurality of input terminals responsive to a first stream of digital data words representative of first amplitudes and an output terminal to output a first output signal having the first amplitudes; a first sampling clock to generate a clock signal for the first RF DAC, the first sampling clock having an adjustable phase and an input to receive a first phase control signal to set a phase of the first sampling clock; a second RF DAC having a plurality of input terminals responsive to a second stream of digital data words representative of second amplitudes and an output terminal to output a second output signal having the second amplitudes; a second sampling clock to generate a clock signal for the second RF DAC, the second sampling clock having an adjustable phase and an input to receive a second phase control signal to set a phase of the second sampling clock; a combiner to combine the first output signal and the second output signal; and a processor to generate the first stream of digital data words, the second stream of digital data words, the first phase control signal, and the second phase control signal, wherein the processor is configured to operate the digital RF power amplifier in one of multiple operating modes based, at least in part, on an output power level to be generated.