Phase locked loop for phase or frequency modulation application, has phase comparator activating measurement signal during measurement time interval that is generated at duration defined by cycle count of high frequency signal

摘要

The loop has a phase comparator (32) activating a phase difference measurement signal during a measurement time interval, when an active face of a reference signal falls inside the time interval, so that the signal includes pulses. The time interval is generated in response to an active face of the divided frequency signal, at a duration defined by cycle count of high frequency signal. One of the pulses is present between start of the measurement time interval and the active face of the reference signal. Another pulse is present between the active face of the reference signal and end of the time interval.