Patent ID: 6853836
Filing Date: 2005-02-08
Classification: H03C

Abstract:
1. A polar loop transmission circuit, comprising: a generator outputting an input signal; an oscillator having an output and generating a high-frequency signal dependent on a phase comparison signal, the high-frequency signal being available at said output; an amplitude modulator connected to said output of said oscillator and receiving the high-frequency signal, said amplitude modulator having an output and, in dependence on an amplitude modulation signal received by said amplitude modulator, outputs an output signal derived from the high-frequency signal, at said output of said amplitude modulator; a feedback path having an amplifier with an input connected to said output of the amplitude modulator and an output, said amplifier having a control terminal for receiving a control signal, said feedback path having a mixer with a mixer output and an input connected to said output of said amplifier, said mixer outputting an intermediate frequency signal derived from the output signal and available at said mixer output; first circuitry for providing the amplitude modulation signal by comparing amplitudes of the input signal and the intermediate frequency signal, said first circuitry connected downstream of said generator and upstream of said amplitude modulator; and second circuitry for providing the phase comparison signal by comparing phases of the input signal and the intermediate frequency signal, said second circuitry connected downstream of said generator and upstream of said oscillator.