Power- conserving drive-modulation method for envelope-elimination-and-restoration (EER) transmitters
US6256482A · kind A · utility
Inventor
Key dates
| Filing date | Apr 4, 1998 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Apr 4, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/0227
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and a circuit for high-efficiency linear RF-power amplification over a wide range of amplitudes from zero to peak output includes a final RF-power amplifier operating at or near saturation, an RF driver amplifier, a high-level amplitude modulator for the final amplifier, preferably a high-level amplitude modulator for the driver amplifier, and a means for determining the supply-voltage input to the final amplifier and for controlling the amplitude of the drive. The means for determining the supply-voltage input and for controlling the amplitude acts so that the final amplifier drive varies from a minimum level to peak as the desired transmitter output varies from zero to peak. The transmitter is preferably of the envelope-elimination-and-restoration type or the envelope-tracking type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.