Adjustable radiation-controlled filter with voltage controlled bandwidth
AssigneeUnisys Corporation
InventorsBruce H. Williams, Valjean P. Snyder, Patrick S. Grant
Life of this patent
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Abstract
Embodiments disclose an adjustable filter (cf voltage-controlled bandwidth) having photoconductors whose resistance is adjusted by variable-intensity radiation source means, with a related feedback loop to compensate for thermal changes.
Claims16
An Adjustable filter arrangement including a Photoconductor stage whose resistance is continuously variable to yield a bandwidth variation in accordance with received radiation intensity;
- variable-intensity radiation Source means arranged and adapted to provide such radiation of intensity apt for so varying the resistance of said Photoconductor stage in continuously-variable, feedback mode;
- filter Input means arranged and adapted to apply prescribed signals to said Photoconductor stage;
- and filter Output means arranged and adapted to accept said signals filtered by said stage and present them to utilization means.
An adjustable filter arrangement comprising a photo-conductor stage arranged to respond to variable radiation source means to yield a bandwidth variation according to the radiation output levels and related photo-conductor means arranged to be continuously-variable for automatically correcting the output of said radiation source in response to prescribed error conditions, being coupled therewith in feedback relation.
Dependencies are inferred from the claim text.