AWG G3 PAD FOR PS3 Spécifications télécharger pdf (Page 254)

7 Analog Modules Synchronization

254 System Reference, January 2001

Synchronization Uncertainty

For high speed mixed-signal applications, the key is to

decrease uncertainty with the timing system in the analog

modules.

The uncertainty arises from the relationship between

phases of the trigger signal applied to analog modules and

the master clock used for trigger signals and analog

modules. Hence, uncertainty is also associated with your

trigger line length on the DUT board.

For the following high speed analog modules, the timing

calibration supplied by the system measures the phase

between the master clock edge and the trigger edge under

a fixed condition.

• High Speed AWG

• High Speed Digitizer

• Dual High Speed Sampler

Hence, the system can use the calibration data to compen-

sate the trigger timing to the analog modules for removing

the synchronization uncertainty of the timing system in

the analog modules. However, this compensation is valid

only when you use the same master clock for the digital

channel as the trigger source and the analog module. This

is because, when different master clocks are used for

them, the phases of the master clocks are independent.

Therefore, if your application requires some certainty of

the synchronization, you should use the same master

clock for the digital channel as is used for the trigger

source and analog module.

If you use multiple analog modules when using different

master clocks, uncertainty will occur between analog

modules. However, you can remove the uncertainty

between the same kinds of analog modules (for high speed

AWGs or dual high speed samplers) even if you use

different master clock sources for digital channels and

analog modules. For details, see “Master Trigger Func-

tion” on page 260.

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AWG G3 PAD FOR PS3 Spécifications Page 254