Patent ID: 7427903

Claim:
A polar modulator comprising: a first signal input that receives a phase modulation signal; a second signal input that receives an amplitude modulation signal; a phase locked loop with a reference input that receives a reference signal, an actuating input coupled to the first signal input, and an output, wherein the phase locked loop outputs a high-frequency signal with a frequency derived from the reference signal and the phase modulation signal at the output; a controllable voltage source with a voltage output and a control input coupled to the second signal input; a filter device having an input and an output, that receives the high-frequency signal at the input; a push-pull amplifier operating in a switching mode with an output and an input coupled to the filter device and a load which is coupled to the output, wherein the push-pull amplifier has two amplifier transistors connected in series and connected to the voltage output of the controllable voltage source and control terminals of the two amplifier transistors are connected to the input; and an amplifier circuit having a limiting amplifying behavior coupled to the output of the phase locked loop and the input of the filter device.