Power amplifier with controlled output power
US7560989B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2007 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | May 20, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/7236
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention includes a power amplifier with an amplifier core including parallel amplifier cells, a replica cell made of one amplifier cell similar to those of the amplifier core, a power controller to select a combination of amplifier cells to activate, a regulator to fix the top voltage of the replica cell to a reference voltage, a voltage generator to provide the voltage reference to the regulator, a current generator to provide a reference current through the replica cell, and a drive unit controlled by the regulator output to drive the combination of amplifier cells, so that each selected combination of activated cells defines a predetermined attenuation level of power amplifier output signal so that it is attenuated in a stepwise manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.