Highly stable frequency synthesizer loop with feedforward
CA 2234855 C · Owner: Mcmahill, Daniel R. · Inventors: Mcmahill, Daniel R.; Whitehouse, Thomas C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A frequency synthesizer loop (200) includes a first voltage controlled oscillator (201) and a first divider circuit (202) for dividing a frequency of an output signal generated by the first voltage controlled oscillator (201) by a factor of N. The synthesizer loop (200) further includes a phase/frequency detector circuit (203) a loop filter circuit (204), a summing circuit (206) a feedforward amplifier (205), a second voltage controlled oscillator (207), and a second divider circuit (208) wherein the second divider circuit (208) divides a second output signal generated by the second voltage controlled oscillator (207) by a factor of M and a microprocessor (210) varies the value of M to keep …
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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 November 14, 1996 and granted January 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2018.
- 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.