Phase error cancellation circuit and method for fractional frequency dividers and circuits incorporating same
CA 2480258 C · Owner: Kaben Research Inc. · Inventors: Riley, Thomas Atkin Denning
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A frequency divider circuit (11) has an input port for an input signal (FO) to be divided, an output port for a divided signal (FDIV) and means (12-19) for , providing a variable division ratio control signal (N+C) and a residual quantization error signal (R), applying the variable division ratio control signal (N+C) to a control port of the frequency divider and using the , residual quantization error signal (R) to cancel phase error in the divided signal. Both the variable division ratio control signal (N+C) and the residual quantization error signal (R) are dithered.
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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 March 28, 2003 and granted August 20, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2025.
- 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
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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.