Control circuit and method for direct current controlled attenua

Details Control circuit and method for direct current controlled attenua Control circuit and method for direct current controlled attenua

1995-12-11

1997-08-12

Gensler, Paul

Wave transmission lines and networks

Attenuators

333 81A, H03H 724

Patent

active

056569785

ABSTRACT:
A bridge T attenuator which includes PIN diodes in both the bridge arm and in the shunt arm, and in which the current through the shunt arm is controlled with respect to the current through the bridge arm, so that the product of these two currents equals a constant. This is accomplished by a feedback loop. Thus a relatively simple, inexpensive, and entirely analog solution is provided for a bridge T attenuator to be used with a radio frequency signal, so that a prescribed level of attenuation set by a user may be maintained while the impedance is maintained at a fixed value over the entire attenuation range.

REFERENCES:
patent: 3289120 (1966-11-01), Anders et al.
patent: 3529266 (1970-09-01), King
patent: 3663900 (1972-05-01), Peterson
patent: 3921106 (1975-11-01), Williams
patent: 4236126 (1980-11-01), Weller et al.

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