Variable bandwidth crystal filter with varactor diodes
US5051711A · kind A · utility
8Cited by
9References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1989 |
| Grant date | Sep 24, 1991 |
| Priority date | — |
| Expiry date | Apr 27, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/542
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A crystal filter with continuously variable passband, and a constant input and output impedance using quartz crystals, fixed inductors and varactor diodes. The width of the filter passband is set by a DC voltage on a single control line through a resistor biasing network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.