Impedance matched passive radio frequency transmit/receive switch
US7538741B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 2008 |
| Grant date | May 26, 2009 |
| Priority date | — |
| Expiry date | Jan 2, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45318
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A Radio Frequency (RF) structure services an antenna having a characteristic impedance and includes a differential Power Amplifier (PA), a differential Low Noise Amplifier (LNA), and a balun transformer. The differential PA has a differential PA output with a PA differential output impedance. The differential LNA has a differential LNA input with an LNA differential input impedance. The balun transformer has a singled ended winding coupled to the antenna, a differential winding having a first pair of tap connections coupled to the differential PA output and a second pair of tap connections coupled to the differential LNA input, and a turns ratio of the single ended winding and the differential winding. The turns ratio and the first pair of tap connections impedance match the PA differential output impedance to the characteristic impedance of the antenna. The turns ratio and the second pair of tap connections impedance match the LNA differential input impedance to the characteristic impedance of the antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.