Patent ID: 8570101
Filing Date: 2013-10-29
Classification: H03F

Abstract:
1. Method for driving a RF out-phasing power amplifier circuit arrangement for amplification of RF input signals with modulated amplitude and modulated phase, wherein the circuit includes first and second amplification branches each having an input and an output, for amplifying one of a first and a second out-phased signal, being only phase modulated and having respective duty-cycles, a combination of the out-phased signals corresponding to the RF input signal; wherein in each of the first and second amplification branches, respective first and second amplification devices are operative in a switching operation mode; wherein the method comprises: generating based on the amplitude information of the RF input signal a digital control signal; phase modulating a clock signal in accordance with the phase information of the RF input signal; frequency multiplying the clock signal by a predetermined binary factor; creating at least two copies of the phase modulated clock signal including a phase shift with respect to each other in accordance with the digital control signal for producing of one of the first and second out-phased signals; controlling by means of the digital control signal selective swallowing of pulses in each copy of the clock signal during a division operation compensating the frequency multiplying step thus a determined delay in the clock signal is effected corresponding to the amplitude information of the RF input signal; and multiplying the two copies of the clock signal to produce of one of the first and second out-phased signals.