Patent ID: 7315214

Claim:
A phase locked loop comprising: a controlled oscillator for delivering an output signal at a determined output frequency; and a frequency divider for converting the output signal into a signal at divided frequency, including: a first loop having a loop filter for generating a first signal for control of the oscillator on the basis of the signal at divided frequency, wherein the first loop comprises a first phase/frequency comparator for producing a first signal of measurement of a phase/frequency deviation between the signal at divided frequency, on the one hand, and a first reference signal at a first determined reference frequency, on the other hand; and a second loop having a loop filter different from the loop filter of the first loop, for generating, on the basis of the signal at divided frequency, a second signal for additional control of the oscillator, wherein the second loop comprises a second phase/frequency comparator for producing a second signal of measurement of a phase/frequency deviation between a signal obtained by frequency multiplication on the basis of the signal at divided frequency, on the one hand, and a second reference signal at a second determined reference frequency, higher than the said first reference frequency, on the other hand, wherein the loop filter of the said first loop and the loop filter of the said second loop have different respective cutoff frequencies.