Variable attenuator

Details Variable attenuator Variable attenuator

1994-11-16

1995-12-19

Gensler, Paul

Wave transmission lines and networks

Attenuators

333 81A, H01P 122

Patent

active

054772001

ABSTRACT:
A current bias-type variable attenuator. Two PIN diodes are disposed in series to each other and in the forward direction on a bias current path. When a bias voltage is applied to a bias terminal, d.c. current flows in the order of a combination output port, an in-phase output port, a first PIN diode, an input port, a 900.degree.--delayed phase output port, and a second PIN diode, or in the order of the combination output port, the in-phase output port, the first PIN diode, the second PIN diode, the 900.degree.--delayed phase output port, and the input port. Since d.c. current flowing through the first PIN diode and d.c. current flowing through the second PIN diode have an equal value, an RF resistance of the first PIN diode and that of the second PIN diode are balanced.

REFERENCES:
patent: 4216445 (1980-08-01), Abajian
patent: 4701724 (1987-10-01), Martin
patent: 5204643 (1993-04-01), Verronen
Arvind K. Sharma, "Solid-State Control Devices: State of the Art" 1989 State of The Art Reference, pp. 95-112 Microwave Journal.

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