Patent ID: 6947713

Claim:
A phase- or frequency-modulated and amplitude-modulated radiofrequency signal generator suitable for radio transmission, comprising: means for generating a phase or frequency control signal and an amplitude control signal, from a phase or frequency modulation signal and from an amplitude modulation signal respectively; phase or frequency modulation means comprising an input which receives the phase or frequency control signal, and an output which delivers a phase- or frequency-modulated radiofrequency signal of substantially constant amplitude; a variable-gain radiofrequency power amplifier comprising an input which receives the phase- or frequency-modulated radiofrequency signal of substantially constant amplitude, an output which delivers the phase- or frequency-modulated and amplitude-modulated radiofrequency signal, and a gain control input which receives the amplitude control signal, wherein the generating means comprise means of feedback control of the amplitude of the output signal, and, further, means of adaptive predistortion which are arranged so as, during a phase of continuous operation, to carry out a predistortion of the phase or frequency control signal as a function of the amplitude modulation signal, and so as, during a learning phase, to be adapted on the basis of the ampiltude modulation signal and of the amplitude control signal.