Digitally tuned, integrated baluns with enhanced linearity for multi-band radio applications
US7688158B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2007 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Apr 7, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/48
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated balun includes a low pass filter and a high pass filter that are formed on a semiconductor chip using tunable reactive elements. The outputs of the low pass filter and the high pass filter are tied together to form the single ended output of the balun. The inputs of the low pass filter and the high pass filter form the differential inputs of the balun. The low pass filter and the high pass filter each include a number of tunable networks for achieving the tunable reactive elements. Each tunable network includes at least one switching transistor and at least one fixed value reactive elements. In at least one embodiment, dynamic biasing circuitry may be provided to improve the linearity and reduce the insertion loss of the balun.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.