Variable capacitor and filter circuit with bias voltage
US8675337B2 · kind B2 · utility
3Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2009 |
| Grant date | Mar 18, 2014 |
| Priority date | — |
| Expiry date | May 24, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G7/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable capacitor includes a metal oxide film having a perovskite structure, first and second electrode films having the metal oxide film placed therebetween and to be coupled to an external voltage source, and a bias voltage source configured to provide a bias voltage that is applied in series or parallel to a capacitance of a capacitor including the metal oxide film and the first and second electrode films, wherein the bias voltage applied by the bias voltage source to the capacitance is adapted to maximize a voltage dependency of a relative permittivity of the metal oxide film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.