Patent ID: 8463227
Filing Date: 2013-06-11
Classification: H03D,H04B

Abstract:
1. A receiver comprising: a synchronization circuit arranged to provide a set of oscillator signals that are synchronized with a carrier of an amplitude-modulated signal, the set of oscillator signals comprising a first amplitude-demodulation oscillator signal and a second amplitude-demodulation oscillator signal that differ in phase; a first amplitude-demodulation mixer for mixing the first amplitude-demodulation oscillator signal with the amplitude-modulated signal so as to obtain a first amplitude-demodulated signal; a second amplitude-demodulation mixer for mixing the second amplitude-demodulation oscillator signal with the amplitude-modulated signal so as to obtain a second amplitude-demodulated signal; a magnitude comparator arranged to compare respective magnitudes of the first amplitude-demodulated signal and the second amplitude-demodulated signal so as to obtain a phase-error detection signal that varies as a function of a difference between the respective magnitudes of the first amplitude-demodulated signal and the second amplitude-demodulated signal; and a phase-error correction path that is coupled between the magnitude comparator and a frequency-control point in the synchronization circuit, the set of oscillator signals having a frequency that varies as a function of a signal at the frequency-control point.