Method and apparatus for broadband impedance matching

Details Method and apparatus for broadband impedance matching Method and apparatus for broadband impedance matching

1989-06-09

1991-02-12

Mullins, James B.

Amplifiers

With distributed parameter-type coupling means

Distributed amplifier

330277, 333124, H03F 360

Patent

active

049927523

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.

REFERENCES:
patent: 4543535 (1985-09-01), Ayasli

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