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7 Analog Modules Synchronization

244 System Reference, January 2001

Figure 112 Start Timing of Analog Module after Receiving Trigger

If a test requires highly accurate synchronization between

the digital channel operation and an analog module oper-

ation, you need to decide the edge position of the trigger

signal that will be sent to the analog module, taking

account of the “Trigger-to-Signal Delay”, “Accuracy”, and

“Uncertainty” for the start timing of the analog module.

Therefore, you should consider whether the dispersion for

the start timing of the analog module such as shown in the

above figure has a strong influence on your test or not.

For the following three modules, if the same master clock

is used for the digital channel as trigger source and the

analog module, you can remove this uncertainty. See

“Synchronization Uncertainty” on page 254.

• High Speed AWG

• High Speed digitizer

• Dual High speed sampler

If the master clock used for the digital channel as trigger

source is different from that used for the analog module,

there is always

±1 master clock period of uncertainty.

Trigger signal

@trigger input pin

of analog module

Analog module’s start timing

@Analog module pin

anastart

Trigger-to-signal

delay

Receive timing

Accuracy range

Uncertainty

(

1 master clock period)

1 master clock period

Analog module starts from any point in this period.

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AWG G3 PAD FOR PS3 Dokumentacja Strona 244