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7 Analog Modules Sampler

216 System Reference, January 2001

Sampler

There is one type of sampler available as follows:

• Dual High Speed Sampler (1 GHz 12-bit)

 Code name: SPA

Sampler Overview

The sampler is a special module in the waveform digi-

tizers. The sampler can capture very high frequency

analog signals that cannot be measured by general wave-

form digitizers described in the previous section.

The sampler can record periodic signals only. The periodic

signal is sampled and held by the high bandwidth

sampling head, then digitized by an internal analog-to-

digital converter that works the same way as the digitizer.

The digitized data can be stored in the waveform memory.

The digitized data can be averaged for the same phase

point. The sampler sequencer controls the waveform

memory area where digitized data is stored, and the

number of sample points.

A sampler module has two channel units. The two channels

can operate by sharing the timing generator, sequencer,

and waveform memory simultaneously. Hence, the two

channels can measure two analog signals with a very tight

timing skew (typical ±100 ps). To perform highly accurate

two-channel measurements, you should connect the input

pins of the sampler to DUT output pins with coaxial cables

or patterns that have the same electrical length on the DUT

board, and use the same voltage range for both channels.

The samplers start waveform measurements by entering

the external triggers. Generally, a digital channel is used

for each sampler (two channels) as the external trigger

source. A trigger signal must be supplied at the SYNC CLK

pin. For more information of the synchronization trigger,

see “Synchronization Trigger” on page 248.

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AWG G3 PAD FOR PS3 Dokumentacja Strona 216