Variable attenuator device having substantially constant...

Details Variable attenuator device having substantially constant... Variable attenuator device having substantially constant...

2005-05-03

2005-05-03

Nguyen, Patricia (Department: 2817)

Wave transmission lines and networks

Attenuators

C333S08100R

Reexamination Certificate

active

06888419

ABSTRACT:
An attenuator of the current invention allows the adjustment in attenuation at a constant impedance level. The attenuator includes at least three variable resistors. Two of the three variable resistors have the substantially same linear resistance characteristics and are controlled in a substantially identical manner. One of the three variable resistors has a non-linear resistance characteristic and is controlled concurrently with the above two variable resistors. As a result of the above resistance characteristics and control, the attenuation is adjusted with respect to the resistance while impedance is maintained at a constant level.

REFERENCES:
patent: 3890589 (1975-06-01), Kogo et al.
patent: 3944962 (1976-03-01), Honda
patent: 3969666 (1976-07-01), Simon
patent: RE29018 (1976-10-01), Garuts
patent: 3984793 (1976-10-01), Hannaford et al.

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