Patent ID: 7733188
Filing Date: 2010-06-08
Classification: H03L

Abstract:
1. A method for generating a periodic signal, comprising: receiving a reference signal; executing a phase comparison between the reference signal and a feed back signal; outputting a phase comparison signal depending on a size of a phase difference between the reference signal and the feed back signal; applying a charge pump to the phase comparison signals and providing a charge pump output; filtering the phase comparison signal from the charge pump output using a filter comprising only a capacitor, coupling the phase comparison signal to an oscillator via an amplifier, generating the periodic signal using the oscillator, wherein a frequency of the periodic signal is generated depending on the filtered phase comparison signal and depending on the coupled phase comparison signal, wherein an amplification factor of the amplifier is chosen depending from a current at the charge pump output; and feeding back the periodic signal from the oscillator, to provide a feedback signal for carrying out the phase comparison.