Electronically controlled variable attenuator

Details Electronically controlled variable attenuator Electronically controlled variable attenuator

1998-05-22

2000-06-27

Zweizig, Jeffrey

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327325, 327583, H03L 500

Patent

active

06081151&

ABSTRACT:
The present invention relates to a variable power-attenuation circuit whose attenuation is controlled electronically by a control voltage (Vc). This circuit includes resistive elements (R20, R21, D20, D21) of which at least two resistive elements are diodes (D20, D21), and a biasing device intended to set the direct current passing through the diodes. This circuit is characterized in that the biasing device includes means for independently setting the characteristic impedance of the circuit, the size of the dynamic range of the control voltage (Vc) and the position of the said dynamic range.
Application to the production of transmission devices for directional radio.

REFERENCES:
patent: 3663900 (1972-05-01), Peterson
patent: 4047131 (1977-09-01), Ludikhuize
patent: 4220874 (1980-09-01), Iwata et al.
patent: 4369414 (1983-01-01), Aoki et al.
patent: 4668882 (1987-05-01), Matsuura
patent: 5140200 (1992-08-01), Stanton
patent: 5300900 (1994-04-01), Bellantoni

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