Complex valued delta sigma phase locked loop demodulator
CA 2422794 C · Owner: Riley, Tom · Inventors: Riley, Tom
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The demodulator is a multiple stage demodulator. The first stage is a conversion stage which converts an incoming signal into a first complex representation. The second stage is a direct digital synthesizer (DDS)/mixer which synthesizes a signal to be mixed with the first complex signal and performs the mixing operation to produce a second complex output. This second complex signal is controlled by a bitstream fed back from the third stage - a phase quantizer stage. The bitstream represents the quantized phase difference between the synthesized signal and the first complex signal. The DDS/mixer stage then measures the synthesized signal for any phase difference from the incoming …
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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 September 19, 2001 and granted August 23, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 19, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 2023.
- 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.