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Article: Characterizing high-speed digital circuits: a job for wideband scopes. (Technical)
- Article from:
- EDN
- Article date:
- June 10, 1993
- Author:
CopyrightCOPYRIGHT 1993 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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What you see on your scope is what you get...or is it? If you think that a 100-MHz scope has enough bandwidth to show you how a circuit clocked at 33 MHz really behaves, you may be wrong--and sorry. What the scope fails to show you can cause big trouble.
With the advent of fast TTL and CMOS ICs, subnanosecond edges have become a reality-forcing you to use circuit-design and board-layout techniques originally developed for high-speed analog circuits. Establishing that any high-speed circuit works as intended involves lots of testing. Historically, the primary tool for such testing has been the analog oscilloscope. Unfortunately, most of these instruments are ...