Tunable filter and method of tuning a filter
US6778023B2 · kind B2 · utility
318Cited by
9References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2001 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Jul 31, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A bandpass filter is tuned by converting the filter into an oscillator using a negative resistance circuit, tuning the oscillator by using conventional tuning techniques such as tuning a varactor via a phase locked loop, sampling and holding the tuning signal and switching off the negative resistance circuit to convert the oscillator back into a bandpass filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.