Frequency synthesizer
CA 2099299 C · Owner: Jokura, Jun · Inventors: Jokura, Jun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control voltage coarse adjustment circuit including a D/A converter voltage generator is provided on a load side of a capacitor in a loop filter included in a phase locked loop. For this structure a, coarsely adjusted voltage is generated to be added to a voltage which is generated by the capacitor of the loop filter for the switch-over of channels during a communication frame. The added voltages are applied to a voltage controlled oscillator to change a frequency for the switch-over of channels. Consequently, the charge and discharge of the capacitor is carried out in a short time to suppress the influence of dielectric absorption current. Thus, the intermittent operation of the phase …
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 June 28, 1993 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2015.
- 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.