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DMI Compliance & Sink Characterization Using DTG5000 Series Data Timing Generator
Application Note
9
www.tektronix.com/signal_sources
– DTGM32 and Function Generator Method: This
appr
oach is ideal for quick verification and cost-
effective pre-compliance testing. The method uses
a DTGM32 module (Figure 6) plugged into the
DTG5000 Series mainframe, in conjunction with a 2
channel function generator to add the required jitter
content. Figur
e 7 depicts this scheme. The DTGM32
module allows jitter components to be added to its
output. The jitter amplitude is contr
olled by the
input amplitude of the jitter source, in this case a
Tektronix AFG3102. An input level of 1 volt produces
up to 2 ns peak-to-peak jitter
. Figur
e 8 illustrates a
jitter spectrum produced using this method with
1 MHz and 7 MHz added.
Figure 6.
DTGM32 Jitter Generation Module.
Figure 7.
Sink jitter tolerance test setup using a function generator to the jitter modulation source for the
DTGM32 module.
Figure 8.
Spectral display of jitter at 1 MHz and 7 MHz.