Frequency tuning circuit for lattice filter
US7920036B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 2, 2008 |
| Grant date | Apr 5, 2011 |
| Priority date | — |
| Expiry date | Mar 14, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A lattice tunable filtering circuit includes a first input and a second input, and a first output and a second output. The circuit includes two series branches and two parallel branches. The first and second series branches include a Tunable Resonator Component (TRC) which presents a first series resonance frequency whereas the third and fourth parallel branches present a second series resonance frequency which has a value being lower than that of the first series resonance frequency. The first and second series resonance frequencies are tunable by one analog control quantity. The filtering circuit further includes a feedback control loop for the control of the analog quantity, which feedback is based on a criterion of equality between the modulus of impedances Zs and Zp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.