Phase synchronizing circuit
CA 1198181 A · Owner: Nec Corporation · Inventors: Ichiyoshi, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A phase synchronizing circuit which has an extended pull-in range compared with the conventional phaselock loop is disclosed. The conventional phaselock loop comprises a voltage controlled oscillator for generating an output signal in response to a control voltage a phase comparator for phase-, comparing the output signal from the voltage controlled oscillator with a first signal to provide a second signal, and a loop filter for smoothing the second signal to provide the control voltage. In addition to these components the inventive circuit includes a phase shifter which phase-shifts the output signal by (.pi./2) + n.pi. (n being an integer) to provide a third signal. A first mixer is …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 17, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 17, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.