Anti-aliasing filter circuit for oscilloscopes

Details Anti-aliasing filter circuit for oscilloscopes Anti-aliasing filter circuit for oscilloscopes

1984-09-21

1986-11-04

Dixon, Harold

Electric lamp and discharge devices: systems

Cathode ray tube circuits

307521, 324121R, 328151, H01J 2334

Patent

active

046212175

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.

REFERENCES:
patent: 3172053 (1965-03-01), Ronzheimer
patent: 4142146 (1979-02-01), Schumann
patent: 4513260 (1985-04-01), Ragan

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