Digital continuous phase modulation for a dds-driven phase locked loop
CA 2275589 A1 · Owner: Sundegard, Bo · Inventors: Sundegard, Bo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system (10) and method are provided in which a phase modulation generator (12) is used to modulate the output signal of a DDS (18) with a modulation index, h/N. The phase-modulated DDS output drives a PLL (26) which is an , upconversion stage for a radio transmitter with the modulated DDS signal as , the PLL's (26) reference. The output of the PLL (26) will have a modulation index of h. Consequently, the frequency band of the DDS (18) output is significantly narrower than the frequency band of upconversion stages used in conventional transmitters, and there are significantly less spurious emissions in the transmitted signal. However, a transmitter employing the present …
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 December 16, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 2019.
- 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.