Distributed digital attenuator

Details Distributed digital attenuator Distributed digital attenuator

1992-09-24

1994-05-03

Bertsch, Richard A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307264, 307555, 307568, 333 81A, H03H 1124

Patent

active

053090489

ABSTRACT:
A digital attenuator circuit for attenuating RF frequencies implemented as an MMIC having series microstrip transmission lines between an RF input terminal and an RF output terminal and having at least one shunt path comprised of a series combination of a MESFET able to be switched between a conducting state and a nonconducting state and a thin-film resistor, wherein the circuit employs a distributed topology whereby when the MESFET is in the conducting state the impedance of the microstrip transmission lines matches the impedance of the shunt elements thereby enabling the circuit to operate over a wide bandwidth.

REFERENCES:
patent: 4438415 (1984-03-01), Hopfer
patent: 4837530 (1989-06-01), Kondoh
patent: 5001524 (1991-03-01), Golio et al.
patent: 5006735 (1991-04-01), Taylor
patent: 5049841 (1991-09-01), Cooper et al.
patent: 5109204 (1992-04-01), Keefer
patent: 5157323 (1992-10-01), Ali et al.

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