Implementation and control of filters
CA 1288486 C · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Mader, Heinz Bernhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Electrically controllable active filters are controlled and implemented with the aid of a differential gain stage. The stage includes pairs of like amplification components and groups of series-connected diode components as well as at least one current generator. The forward voltage drop of the diode components has the same current responsive as the base-emitter voltage of the amplification components. A filter of the first order includes a differential gain stage with a capacitive component connected across the output of said stage or to its amplification components. A filter of the second order can include two differential gain stages, each with its capacitive component in circuit. An …
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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 September 3, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 3, 2008.
- 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.