Tektronix, Inc.

Roydn Jones

Charles L Saxe

Thomas P Dagostino

Luis J Navarro

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.

Anti-aliasing filter circuit for oscilloscopes

A charge coupled device (CCD) with separately addressable input signal gates is operated in the potential equilibrium mode. With properly selected voltage potentials the CCD can be used as a high speed linear detector of a variable analog signal without the need of preceeding independent sample and hold or peak detector circuits. The result is the efficient minimum/maximum detection of an analog signal in a fast-in/slow-out digitizer.

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Aloha, OR, United States of America

Roydn Jones