Frequency comparator circuits
CA 1238954 A · Owner: American Telephone And Telegraph Company · Inventors: Morrison, Ronald A.; Campbell, Scott O.; Ganesan, Apparajan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract A voltage comparator includes two sampled input networks connected in parallel between an input reference voltage and the inverting input of an integrator the other, input of which is grounded. The first input network has a first input capacitor which is through-switched at a first sampling frequency. The second input network has a second input capacitor which is diagonally-switched at a second sampling frequency, thus providing an output voltage to the integrator which is of opposite polarity to that of the first network. For a given ratio between the capacitors the output of the integrator is determined by the relationship between the sampling frequencies thus, providing a …
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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
- Granted July 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 5, 2005.
- 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.