Frequency synthesizer and frequency synthesizing method
CA 2090523 C · Owner: Nec Corporation · Inventors: Watanabe, Nozomu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A frequency synthesizer and a frequency synthesizing method comprises, for the purpose of achieving frequency switching in a short time even though the switched width of an output frequency signal from the frequency synthesizer is narrow, a gate pulse generator circuit for generating a gate pulse signal using a frequency-division-number data-activation signal upon setting the output frequency from the frequency synthesizer; and a gate circuit for interrupting a reference frequency signal over a predetermined time interval with the aid of the gate pulse signal, and thereafter driving a voltage-controlled oscillator to switch to oscillate at a new frequency with the aid of a phase comparator, …
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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 February 26, 1993 and granted September 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.