Power amplifier
US7576612B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2007 |
| Grant date | Aug 18, 2009 |
| Priority date | — |
| Expiry date | Dec 18, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/513
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention provides a power amplifier that includes the following: an RF operation transistor 3 having a base to which an RF signals is inputted, an emitter connected to the ground, and a collector connected to a power supply and a terminal for outputting an RF signal; a current reference transistor 12 having a collector connected to a reference current source 11, an emitter connected to the ground, and a base connected to the base of the RF operation transistor, an operational amplifier 22 formed of CMOS having one input connected to the collector of the current reference transistor and the other input connected to the base of the RF operation transistor; and a voltage-to-current conversion transistor 22 for converting the output of the operational amplifier 22 into a current to be supplied to the base of the RF operation transistor. The power amplifier has low power consumption and an efficient use of chip area, and a current variation due to the relative variation in hFE can be prevented, so as to be driven with a low power supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.