Nonlinearity generator using FET source-to-drain conductive path
US5038113A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Dec 1, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/198
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A distortion generator uses the source-to-drain conductive path of a FET as the nonlinear element, in either a reflective or transmissive mode. In the reflective mode, the signal is applied across the source-to-drain conductive path, and in the transmissive mode the source-to-drain conductive path is in series with the transmission path. The FET may be biased, and the gate impedance to reference potential aids in selecting the nonlinearity characteristic. Reflective embodiments of a predistortion equalizer include a circulator version and a 3 dB hybrid splitter version. Transmissive embodiments include a direct series embodiment, and another with a 3 dB splitter and a separator combiner. Limiter and log-amp uses are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.