Signal filter with adjustable analog impedance selected by digital control
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United States of America Patent
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-
May 6, 2003
Grant Date -
Oct 3, 2002
app pub date -
Mar 28, 2001
filing date -
Mar 28, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A signal filter employs digital control signals to selectively establish and adjust analog impedance components of the filter. In the case of a first-order R-C filter, adjustable resistance and reactance assemblies are coupled in series. The resistance assembly has multiple parallel signal paths sharing a common input and output. Each signal path includes a prescribed electrical resistance and a digital switch to selectively enable and disable the resistance. Between the common input and output, the signal paths provide a collective resistance which varies depending upon which switches have been activated. The reactance assembly is similar to the resistance assembly, with capacitors or inductors instead of resistors. A digital controller selectively activates the switches to adjust the assemblies' respective resistance and reactance.
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