H - Electricity – 03 – D
Patent
H - Electricity
03
D
340/165, 350/52,
H03D 13/00 (2006.01) G01R 25/00 (2006.01) H03K 5/26 (2006.01) H03L 7/08 (2006.01) H03L 7/085 (2006.01)
Patent
CA 1232047
ABSTRACT IMPROVEMENTS RELATING TO PHASE DETECTING APPARATUS FOR USE IN SYNCHRONISING SYSTEMS A phase detecting arrangement for use in a frequency and phase synchronising system, said arrangement comprises a phase detector having an inherent delay characteristic and arranged to produce alternate logic 1 and logic 0 outputs in response to the arrival at respective phase detector inputs of set and re-set pulse transitions occurring in pulse trains derived, respectively, from external synchronising signal generating means and signal source means the frequency of which is to be synchronised with that of the synchronising signal, in which first and second sampling devices are associated with the phase detector for directly or indirectly sampling the output from the detector when set and re-set transitions occur, respectively at inputs to the first and second sampling devices and in which outputs from the sampling devices are suitably gated to produce an overall logic 1 or logic 0 output from the arrangement whereby an existing output (i.e. logic 1 or logic 0) from the arrangement is perpetuated when the phase detector output sampled indicates that at least two consecutive set or re-set pulse transitions have occurred without the intervention of an opposite type transition (i.e. re-set or set).
464528
Mccabe David J.
Sumerling Geoffrey W.
Borden Ladner Gervais Llp
Plessey Overseas Limited
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