AutoFocus User’s Guide
50
©1989-2018 Lauterbach GmbH
Timing Requirements
If you suspect timing issues to be the source of the error, then take a closer look at the setup and hold times
of your trace port channels. An oscilloscope (2 channels, bandwidth >1000 MHz, >10 GS/s, probe <5pF) is
required for the following measurements.
Make sure that you use short ground connections. The following two screenshots show the influence of
probe and ground connection length on the clock wave form:
Long GND connection, Probe: 500 MHz, 8 pF, 10 M
, x10
The graph shows a typical
clock wave form.
Short GND connection, Probe: 750 MHz, < 2 pF, 1 M
, x10
The graph shows the
same clock wave form.
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