Broadband high frequency active MMIC circulator

Details Broadband high frequency active MMIC circulator Broadband high frequency active MMIC circulator

1991-02-04

1992-09-01

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

333 11, 330277, 330311, H03H 1138

Patent

active

051442663

ABSTRACT:
A broadband high frequency active MMIC circulator which includes low parasitic devices (MESFETs or HEMTs) and shunt feedback for impedance contouring in conjunction with a cascode/cascade isolation/gain network. To achieve circulation, a common series feedback node is required for each active element. While conventional active circulator topologies require the use of a resistive element for operation with a deleterious effect on noise performance, this broadband high frequency active MMIC circulator functions with either resistive or reactive common series feedback. When reactive feedback is selected, major improvements in noise performance can be realized.

REFERENCES:
patent: 3860893 (1975-01-01), Ropars et al.

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