Anti-aliasing filter circuit for oscilloscopes
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United States of America Patent
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-
Nov 4, 1986
Grant Date -
N/A
app pub date -
Sep 21, 1984
filing date -
Sep 21, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital storage oscilloscope is provided with an anti-aliasing filter circuit utilizing a first plurality of switchable analog filters that bandwidth limit frequencies greater than half the oscilloscope's sampling frequency, and a digital transversal filter effective at lower sweep rates and sampling rates for also bandwidth limiting frequencies greater than half the sampling frequency. The digital transversal filter is controllable to provide a different band pass characteristic for different sweep and sample rates. Both the selection of filters and the control of the digital filter are responsive to the oscilloscope's selection of sweep rate.
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