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3-2 Programming Guide

Remote Data Transfer ESG Family Signal Generators

ARB Waveform Data Downloads

This section explains how to download I/Q waveform files into the signal generator.

NOTE Downloads into volatile ARB memory are significantly faster than downloads

into nonvolatile NVARB memory.

Option UND signal generators accept I/Q waveform data downloads. After downloading

the data, these user-defined I/Q waveforms can be sequenced together with other

waveforms and played as part of a waveform sequence.

Dual ARB waveforms are composed of two sets of data: I data and Q data. The I data

drives the I port of the I/Q modulator and the Q data drives the Q port. These two sets of

data give rise to the name dual arbitrary waveform generator.

I and Q data are arrays of 2-byte integers, in high-byte, low-byte order. The actual

waveform shape is enclosed in the least-significant 14 bits of both the I and Q data. The

other four bits (two for I and two for Q) are used for event markers and internal

sequencing.

A 1 in bit position 14 or 15 of the I data will cause a TTL high to appear at the associated

EVENT BNC connector on the signal generator’s rear panel.

Bit-value-versus-output-power:

• 0 gives negative full-scale output

• 8192 gives 0V output

• 16383 gives positive full-scale output

NOTE Because there are two files, one containing I data and another containing Q

data, it is important that you remember to rewrite both the I and Q waveform

data when downloading and overwriting a waveform in memory.

Types of Arbitrary Waveform Generator Memory

There are two types of arbitrary waveform generator memory: volatile static RAM,

referred to as ARB memory, and nonvolatile FLASH RAM, referred to as NVARB memory.

Bit Number I Q

0 through 13 waveform data waveform data

14 EVENT 1 reserved, set to 0

15 EVENT 2 reserved, set to 0

1 2 ... 179 180 181 182 183 184 185 186 187 188 189 ... 258 259

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Agilent Technologies ESG Spezifikationen Seite 184