Filter control circuit
US5006733A · kind A · utility
15Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 11, 1990 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | May 11, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/1291
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A filter control circuit uses a compound FET as a resistance element. The compound FET includes parallel FETs having different gate widths to provide different drain-source resistance characteristics, which overlap to provide an extended operating region, that approaches a linear curve for the combined resistance characteristic. The control voltage used to control the compound FET may be coupled to like compound FETs in the filter being controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.