Frequency synthesizer
CA 2209290 C · Owner: Van Der Valk, Robertus Laurentius · Inventors: Spijker, Menno Tjeerd; De Rijk, Johannes Hermanus Aloysius; Van Der Valk, Robertus Laurentius
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a circuit for frequency synthesis comprising: a , digital controlled oscillator comprising (a) a clock generator; an , accumulator circuit to which the signal from the clock generator is fed; and a control digit feed circuit for feeding to the digital oscillator a signal representing a control digit; and (b) a phase-locked loop which is connected to the carry output terminal of the accumulator circuit and which is provided with a phase detector, a low-pass filter and a controlled oscillator wherein , the carry output terminal is connected to the phase detector. The digital controlled oscillator is preferably adapted to generate a signal representing a …
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 January 8, 1996 and granted April 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 8, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 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.