Power amplifier and communication apparatus
US6960959B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2001 |
| Grant date | Nov 1, 2005 |
| Priority date | — |
| Expiry date | Jan 17, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/7239
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power amplifier of amplifying signals of two frequency bands is reduced in size and improved in efficiency at low output.The power amplifier includes an input terminal, a branch circuit and so on having one input and a plurality of outputs, the input being connected to the input terminal, amplifying means which are connected to some outputs of the branch circuit and so on and are operated at different signal frequencies from each other, a transmission line connected to one of the other outputs of the branch circuit, a synthesizing circuit connected to the outputs of the amplifying means and the output from the transmission line, a switch provided between the transmission line and a synthesis output unit, and a control circuit of controlling conduction of the branch circuit and so on, conduction and an amplifying operation of the amplifying means, and conduction of the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.