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3-2
Lesson 3 – Synchronization of Analog Modules
Adjusting the Synchronization
Timing
Considering Trigger-to-Signal Delay Only
If the trigger line delay and the signal line delay are much smaller
than the trigger-to-signal delay, you can ignore trigger line length
and signal line length.
For example, if a digitizer is used to measure an analog signal
from a DUT, you have to shift the rising edge location of the
trigger signal to start the measurement at the desired timing by
the trigger-to-signal delay.
Considering Trigger-to-Signal Delay and
Propagation Delays of Trigger Line and Signal Line
If delay factors must be taken into account when testing a device,
you have to compensate for all the delay factors by performing the
following two steps:
Adjusting the Timing at the Pogo Pin of an Analog Module
1
If the reference point for timing adjustment is the signal pogo pin
of the analog module, the delay to be compensated for is the
propagation delay of the trigger line plus the trigger-to-signal
delay. For the digital pin that sends the trigger signal, you have to
shift the rising edge location to start the measurement at the
desired timing by the propagation delay of the trigger line plus
the trigger-to-signal delay. As a result, the analog signal is
measured at the signal pogo pin of the analog module at the
desired timing.
Adjusting Timing at DUT Pin
2
Assuming the DUT pin as the reference point of measurement
timing, you have to compensate for the propagation delay of the
signal line, which is between the DUT pin and pogo pin of the
analog module, when you program the edge location of the trigger
signal.
For the AWG, you have to shift the trigger signal edge backward
–
by the propagation delays of the trigger line plus trigger-to-
signal delay plus signal delay.
151
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