Low cost, pilotless, feed forward compensation for a power amplifier
US6531918B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1998 |
| Grant date | Mar 11, 2003 |
| Priority date | — |
| Expiry date | Nov 10, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3229
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to a low cost feed forward RF power amplifier arrangement for amplifying an RF input signal using a main power amplifier operating as a class A/B amplifier. The method and apparatus modify the input signal to the main amplifier to compensate for the distortion added by the main power amplifier. The circuit provides for injecting a delayed version of the input signal, through a fixed gain-phase circuity, at a point whereby the resulting signal is amplified by the error amplifier of the second loop. A digitally controlled processor iteratively modifies various phase and gain controls to adjust the output of the amplifier. Different gain and phase control lines are iteratively updated at different rates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.