Frequency synthesiser

Details Frequency synthesiser Frequency synthesiser

H - Electricity

03

L

331/35

H03L 7/18 (2006.01) H03L 7/081 (2006.01) H03L 7/197 (2006.01)

Patent

CA 1194155

23 ABSTRACT "Frequency synthesiser". A frequency synthesiser of the type having a reference frequency source CPG, frequency reduction means PS which cancels pulses from a frequency to be reduced and a jitter compensation signal circuit arranged to compensate for any jitter in the output frequency that would otherwise be caused by each cancelled cycle. The jitter compensation signal is derived from a jitter- containing pulse train via a d.c. removal circuit DCR and an integrator INT. Additionally, a perturbation signal is injected by a control device CD which causes pulses to be added to and also to be subtracted, by PA and PS res- pectively, from the frequency to be reduced, the jitter caused by this addition and subtraction also being com- pensated for by the compensation signal circuit.

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