A matching circuit and a method for matching a transistor circuit
CA 2239343 C · Owner: Nec Corporation · Inventors: Iwata, Naotaka; Yamaguchi, Keiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A matching circuit is formed by a series inductor a parallel, capacitor, a drain bias circuit and a DC-blocking capacitor, for the purpose of impedance matching. A capacitor having a capacitance that is dependent upon the bias voltage is used as the parallel capacitor. This can be, for example a material, such as a (BaxSr1x)TiO3 thin-film which exhibits a capacitance, having a bias voltage dependency. Because this thin-film capacitor exhibits polarization by an electrical field its, capacitance is the largest with a bias of O volts and is reduced, to approximately 50% as the bias voltage is increased. By using this capacitor in a matching circuit, it is possible to change the matching …
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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
- Filed June 2, 1998 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2020.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.