Circuit for generating a sum or differential frequency signal
CA 1213945 A · Owner: Sony Corporation · Inventors: Yamagiwa, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a sum or differential frequency signal generating circuit for two input signals of first and second frequencies. This circuit comprises: 1st and 2nd differential amplifiers which receive the input signal of the 1st frequency and generate differential 1st and 2nd output currents having the phase difference of 90°; 3rd and 4th differential amplifiers which receive the input signal of the 2nd frequency and generate differential 3rd and 4th output currents having a phase difference of 90°; a 1st multiplier consisting of a differential amplifier for generating the multiplication output current of the output currents of the 1st and 3rd differential amplifiers; a 2nd multiplier …
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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 November 12, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2003.
- 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.