H - Electricity – 03 – K
Patent
H - Electricity
03
K
328/57
H03K 21/00 (2006.01) H03K 23/00 (2006.01) H03L 7/099 (2006.01) H04L 7/033 (2006.01) H04L 27/227 (2006.01)
Patent
CA 1112304
ABSTRACT OF THE DISCLOSURE A circuit for producing an output waveform synchronised with the timing of a given waveform, the circuit comprising: a multiplicity of digital counting stages arranged as a frequency divider to produce a frequency-divided output from an input frequency, the division ratio of the frequency divider being settable to either, or any one, of at least two values, one of said digital counting stages being a divide-by-two circuit arranged to provide said output waveform, a timing comparison device arranged to make repeated comparisons of the timing of an output of the frequency divider with the timing of a reference waveform, and to produce on each comparison a first signal if the output is leading the reference and a second signal if the output is lagging the reference, the said timing comparison device comprising a first D-type bistable circuit and a transition detector circuit, the output of the transition detector circuit being connected to the CLOCK input of the bistable circuit, and the D input of the bistable circuit being connected to receive the same input as the said divide-by- two circuit forming part of the frequency divider, an integrator device connected to the output of the timing comparison means to integrate the first signal in one direction and the second signal in the opposite direction, and a division ratio setting device to set the division ratio at a first, higher, value if the integrated value exceeds a threshold in the one direction, and at a second lower value if the integrated value exceeds the threshold in the opposite direction.
331275
Fetherstonhaugh & Co.
Post Office
LandOfFree
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