Power amplifier and transmitter
US7336125B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2006 |
| Grant date | Feb 26, 2008 |
| Priority date | — |
| Expiry date | Jul 23, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/75
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A 90-degree phase delay power divider part PSPD is connected to an input side of a carrier amplifier Amp1 and a peak amplifier Amp2, and a variable electric length power combiner VTL2 is connected to an output side thereof. A control signal Sig is applied through a control terminal Ctrl of the variable electric length power combiner VTL2, and adjustment is performed in correspondence to a carrier frequency band of a carrier signal RFs so that an electric length of the variable electric length power combiner VTL2 becomes nearly 90 degrees. As a result, an electric length of an output power combining circuit of a Doherty type amplifier can be made variable, and a power-added efficiency can be enhanced for a multi-band or broad band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.