Amplifier having substantially constant D.C. to r.f. conversion efficiency
US5025225A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1989 |
| Grant date | Jun 18, 1991 |
| Priority date | — |
| Expiry date | Dec 15, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/602
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power combiner which maintains substantially constant power combining efficiency with variable output power includes a set of unit amplifiers that are coupled by the power combiner. The power combiner includes a first plurality of a quarter wavelength transmission line sections coupled to the output of each unit amplifier. The second end of each one of the first plurality of quarter wavelength transmission line sections are successively coupled by a corresponding second plurality of quarter wavelength transmission line sections, with the succeeding or last one of said unit amplifiers having its quarter wavelength transmission line section coupled to an output terminal. The power combiner permits unit amplifiers in the amplifier module to be switched off in succession as less output power is required while maintaining substantially constant power combining efficiency, and hence substantially constant D.C. to r.f. conversion efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.