Tunable active filter
CA 1206543 A · Owner: Western Electric Company, Incorporated · Inventors: Banu, Mihai; Tsividis, Yannis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract A tunable high-pass or low-pass filter employs a balanced amplifier having electronically controlled resistance elements in either two input or two feedback paths (or both). A reactive element is placed in each of the other pair of paths. Especially low distortion results from this arrangement, allowing convenient integrated circuit implementation with a nonlinear device (e.g. MOS transistor) as a voltage-controllable element. Multiple stages can be cascaded and controlled from a reference clock or other precision source for high accuracy.
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
- Granted June 24, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 24, 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.