Composite amplifier, a radio terminal and a method for improving the efficiency of the composite amplifier
US8384475B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2007 |
| Grant date | Feb 26, 2013 |
| Priority date | — |
| Expiry date | Nov 19, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/28
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a composite amplifier (3, 4, 120), a radio terminal (100) including such composite amplifier and to a method for improving the efficiency of such composite amplifier in particular. The composite amplifier according to embodiments of the present invention is arranged to be connected to an output combiner network (43, 53, 63, 73, 83) and to a load (49, 130). the output combiner network comprising at least one dynamically tuneable reactance (47, 48). The instantaneous efficiency of the composite amplifier (3, 4, 120) is increased by tuning the impedances/admittances seen by each of said at least two power amplifiers (41, 42, 71, 72). The amplifiers being differently driven and they may further be part of a Chireix outphasing system or a pair of a Doherty amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.