High linearity multicarrier RF amplifier
US6504428B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2001 |
| Grant date | Jan 7, 2003 |
| Priority date | — |
| Expiry date | May 16, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3235
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A hybrid multicarrier RF power amplifier linearization architecture combines ACT and feed-forward amplifier stages to achieve high output distortion rejection and enhanced amplifier linearity. A carrier cancellation loop is coupled with a main RF power amplifier stage having parallel RF power amplifiers coupled via intermod-complementing predistortion paths. The carrier cancellation loop is coupled to a feed-forward loop containing a feed-forward RF power amplifier, to produce a composite amplified output signal having very reduced intermodulation products. Vector modulators in the main amplifier and feed-forward amplifier stages are controlled by a digital signal processor, using outputs from various monitoring subsystems, including pilot tone detection, correlator, distortion and power detector circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.