High-frequency amplifier circuit and radio communication apparatus using same
US6741127B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2002 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Apr 26, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/004
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a high-frequency amplifier circuit, a power detector detects input power, an A/D converter converts the detection output into a digital signal, and then a digital LPF averages the digital signal to obtain data of the average value of input power level. Control data corresponding to the data of the average value is supplied as a control voltage from a DC-to-DC converter controlling memory to a DC-to-DC converter via a D/A means. Thus, a low output voltage vdd is supplied from the DC-to-DC converter to a power amplifier as circuit supply voltage of the power amplifier at the times of medium and low output power to control unnecessary current consumption by the power amplifier and thereby increase efficiency of the power amplifier at the times of medium and low output power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.