Frequency guided phase locked loop

Details Frequency guided phase locked loop Frequency guided phase locked loop

H - Electricity

03

L

328/28, 331/35

H03L 7/06 (2006.01)

Patent

CA 1175507

FREQUENCY GUIDED PHASE LOCK LOOP ABSTRACT OF THE DISCLOSURE A phase locked loop with a digital frequency comparator aided is applied to achieve a low noise, insensitive to harmonic frequency and fast acquisition phase locking. The circuitry mainly includes a frequency rate monitor, a digital frequency comparator, a conventional phase detector, a voltage summing device and a voltage controlled oscillator. The frequency rate monitor measures input's signal change o frequency and provides a signal indicating a change of frequency existing certain threshold. The digital frequency comparator functions to acquire a voltage output which represents the approximate frequency input. At steady state, the phase locked loop is permitted to function within a frequency range. If there is any major change of frequency, the digital frequency comparator will be activated to generate a new compensation signal again. As a result, the phase locked loop is always guided to function within a frequency range and has the minimum static phase error and lower leakage noise produced compared with other loops consisting of equal loop gain.

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