Frequency synthesizer
CA 2120184 C · Owner: Nec Corporation · Inventors: Kojima, Tatsuru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A frequency synthesizer, which realizes speed-up of channel switching between channels having separated frequencies has an, EEPROM which stores the phase difference between a first frequency divider and a second frequency divider producing outputs corresponding to the frequencies of the channels to be switched. A delay circuit delays the output of the second frequency phase divider by an amount corresponding to an amount of the phase difference stored in the EEPROM. A controller supplies the outputs of the second frequency divider and the delay circuit to a phase detector. Further the controller stops, a PLL operation and restarts it in synchronism with a leading edge of, preferably, a …
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
- Filed March 29, 1994 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 29, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 29, 2016.
- 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.