Crystal oscillator
CA 2373775 A1 · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Clarke, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A crystal oscillator comprises a cristal 1 and a crystal oscillator circuit 3 for providing an output signal 5. In order to adjust the output frequency for , example during the testing stage of production a bank of load capacitors C1 , to C6 are provided. Each capacitor C1 to C6 may be switched into or out of the circuit by a respective switch 9 to 19. The switches are controlled by control lines D0 to D5, which are set by a 6 bit register 21 known as the trim , register. The value in the trim register is set according to the frequency of the output signal. To counteract any swing in the output signal a bank of , current switches T1 to T4 are provided which enable resistors R1 to R4 to …
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 May 2, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 2, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 2022.
- 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.