Method and apparatus for feedforward power amplifying
US5444418A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1994 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Jul 29, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2201/3218
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A feedforward distortion minimization circuit includes a first loop with an input splitter and first and second signal paths, each signal path having an amplifier. An output combiner couples the two signal paths and has an output signal path and an output dump load path. A first signal detector on the dump load path detects a dump load signal, and in response a gain and phase controller operates to adjust the gain and phase of a first signal on one of two signal paths to minimize the power delivered to the dump load. The feedforward circuit also includes embodiments in which both amplifiers operate at around the same power amplification level, and in which a second loop has an error amplifier for further distortion correction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.