Control method for a phase-locked loop

摘要

The information delivered on the output of a detector linearly varies with the detection error only if this error lies in a certain range. To recover larger errors, oscillators are used which cover a wide frequency band part by part until they find the part of the band on which the detector works linearly and thus which the loop can lock on to. A rapid method of covering the frequency band is disclosed. The method includes selecting an initial part of the band to be covered which is close to the center of the frequency band and selecting a next part of the band to be covered which is formed by the band part that has not yet been covered and is closest to the initial part in the direction of the rising or falling frequencies, as a function of a predefined criterion.