Predistortion compensated linear amplifier
US4879519A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1988 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Oct 31, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2201/3221
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A distortion compensation circuit for power amplifier producing a prescribed distortion component receives an input signal having at least one carrier therein in a prescribed frequency range. The input signal is applied to a first circuit path having an amplifier that produces an amplified signal with the prescribed distortion component and to a second circuit path that delays the input signal without distortion. The output signals of the first and second circuit paths are combined in a first combiner to form a signal representative of the prescribed distortion component. A second combiner forms a signal having an amplified input signal component and inverted phase prescribed distortion component responsive to the output of the first combiner and the output the first circuit path. To eliminate signals other than the distortion component from the first combiner, the prescribed frequency range is scanned to detect a carrier signal and the amplitude and phase of the signal in the second circuit path is modified to remove the detected carrier from the output of the first combiner. Remaining distortion in the power amplifier output is removed by scanning the prescribed frequency range t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.