Tunable Sallen-Key filter stage and filter assembly
US7212068B2 · kind B2 · utility
6Cited by
14References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 2, 2004 |
| Grant date | May 1, 2007 |
| Priority date | — |
| Expiry date | Apr 17, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed is a filter circuit assembly that includes a filter stage with a variable resistor and a resistor/capacitor (RC) oscillator. A controlling output of the RC oscillator controls the value of the variable resistor. The RC oscillator itself also includes a variable resistor. The controlling output of the RC oscillator also controls the value of the variable resistor of the RC oscillator. The structure of the variable resistor of the filter stage is substantially the same as the structure of the variable resistor of the RC oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.