Tunable filter and portable telephone
US7135940B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2005 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | May 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/015
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A tunable filter has a plurality of variable capacitors and a plurality of inductor elements, each being formed on a common substrate, a filter circuit formed by using at least a portion of the plurality of variable capacitors and a portion of the plurality of inductor elements, a monitor circuit formed by using at least a portion of the plurality of variable capacitors and a portion of the plurality of inductor elements, a detecting circuit which detects a prescribed circuit constant of the monitor circuit, a storage which stores information relating to a reference circuit constant of the monitor circuit, and a capacitance control circuit which controls capacitance of the variable capacitors in the monitor circuit and capacitance of the variable capacitors in the filter circuit, based on a result detected by the detecting circuit and information stored in the storage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.