Balanced reflective nonlinear processor using FETs
US5146177A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1991 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Aug 30, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/198
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A nonlinear processor for use as a signal limiter or predistortion equalizer includes a four-port, 3dB directional coupler. Signal to be distorted is applied to a first port of the coupler, and is coupled by second and third ports to a pair of nonlinear circuits. Each nonlinear circuit includes the source-to-drain transmission path of a FET. Each nonlinear circuit is grounded or short-circuited, to form a nonlinear reflective circuit which reflects the energy back to the associated port of the coupler. The nonlinearly reflected energy is received at the two coupler ports, and is combined and made available at the fourth coupler port. The input return loss of the processor is improved by matching the nonlinear circuits to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.