Patent ID: 7649958
Filing Date: 2010-01-19
Classification: H03F,H03K

Abstract:
1. A radio frequency (RF) transmit circuit comprising: a signal processing circuit comprising at least an input port for receiving of at least a signal indicative of a carrier frequency and modulation data, at least a first output port for providing of at least an output signal, the at least an output signal comprising first and second output signals having a phase relationship therebetween, the phase relationship changing with time in dependence upon the modulation data; and, a power amplifier (PA) for receiving the at least an output signal and for generating a pulse width modulated signal in dependence thereon, the pulse width modulated signal having pulse widths for approximating an amount of energy within an amplitude modulated signal for resulting in a variable amplitude amplitude-modulated signal from an output port of at least one of a filter and a radiating element receiving the pulse width modulated signal thereof, wherein pulse width is controlled in dependence upon the conduction angle and is varied by changing the phase relationship, and wherein the first and second output signals are constructively/destructively summed to form the pulse width modulated signal.