Filter circuit, and receiver and electronic device using the same filter circuit
US8208590B2 · kind B2 · utility
3Cited by
8References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2007 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Aug 31, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Filter circuit includes Nth-order active filters switching circuit which switches shorting or non-shorting of active filter, and power-supply control circuit which controls such that a power supply of active filter is turned off when switching circuit shorts active filter. A receiver employing filter circuit turns off the power supply of active filter not needed when no interference wave exists within a given range from a desired frequency band. The foregoing structure allows lowering the power consumption of filter circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.