Download Digital Timing Measurements: From Scopes and Probes to by Wolfgang Maichen PDF

By Wolfgang Maichen

As many circuits and purposes now input the Gigahertz frequency variety, exact electronic timing measurements became the most important within the layout, verification, characterization, and alertness of digital circuits.

To be triumphant during this box an engineer must comprehend instrumentation, dimension thoughts, sign integrity, jitter and timing techniques, and records. This ebook offers a compact, practice-oriented evaluation on a majority of these topics with emphasis on useable strategies and real-life guidelines.

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Additional info for Digital Timing Measurements: From Scopes and Probes to Timing and Jitter (Frontiers in Electronic Testing)

Example text

If the termination resistance matches Zodd, then the common signal will only be partially (but to a large extent) terminated, unless the lines are uncoupled so that Zeven and Zodd are equal. A big advantage – not offered by any other differential termination scheme presented here – is that channels terminated this way can be used either in singled ended or in differential mode, greatly improving the flexibility of an automated test platform. On the other end of the complexity spectrum is the simple bridged termination (Figure 19(d)), which consists of just a single resistor between the two lines, matched to the differential impedance.

Looking at the general block diagram of such a scope (Figure 21) we can discern many similarities with an analog scope, but also a number of differences: Just as before, the incoming signal passes through an amplifier/ attenuator that makes its amplitude suitable for the subsequent stages. And 44 Chapter #2 again some part of the signal is fed to the trigger circuitry. 25 The first big difference is that the signal is not fed directly to a cathode ray tube but instead goes into an analog-to-digital converter (ADC).

7 Termination We already know by now that good impedance control throughout the path is extremely important to avoid reflections and maintain good signal integrity. g. oscilloscope, or tester comparator) sits. By itself, receivers (or comparators, if it is the tester end) have high impedances, so the end of the line would be virtually unterminated (resulting in 100% reflection) if there weren’t some additional termination. In a practical setup there are several schemes to terminate the signal at the end of the line.

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