Integrated filter balun
US6542055B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2000 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Oct 31, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/0095
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In one embodiment, an N-stage ladder circuit is serially connected to a bridge (lattice circuit. The N-stage ladder circuit receives differential inputs, e.g. mixers, while the bridge lattice circuit outputs a singled end output, e.g. amplifier. In another embodiment, a bridge lattice circuit is serially connected to an N-stage ladder circuit. The bridge lattice circuit receives a single ended load while the N-stage ladder circuit provides a differential output. Film bulk acoustic resonators are used in the combination ladder and lattice structure for both embodiments to provide the necessary band-pass functionality as well as make the necessary transition from differential to single ended load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.