Method and apparatus for broadband impedance matching
US4992752A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1989 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Jun 9, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/28
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An apparatus and method are disclosed for performing impedance transformations on the order of 4:1 to 8:1 or more over extremely broad bandwidths. The transformations are performed in an apparatus having a plurality of n distributed amplifiers having one common synthetic transmission line sharing inductive elements and a second transmission line connected in parallel to the other transmission lines. The transmission lines incorporate active elements preferably in the form of FET cascode pairs. In one embodiment, the second transistor of each cascode pair is replaced with n smaller gate FETs to decrease DC power requirements and provide additional doncution paths for impedance reduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.