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Chpater 6 143
6 Custom Arb Waveform Generator
In the following sections, this chapter describes the custom arbitrary waveform generator mode,
which is available only in E8267D PSG vector signal generators with Option 601 or 602:
• “Overview” on page 143
• “Working with Predefined Setups (Modes)” on page 143
• “Working with Filters” on page 146
• “Working with Symbol Rates” on page 153
• “Working with Modulation Types” on page 155
• “Configuring Hardware” on page 162
See also: Chapter 3, “Basic Digital Operation,” on page 71
Overview
Custom Arb Waveform Generator mode can produce a single modulated carrier or multiple modulated
carriers. Each modulated carrier waveform must be calculated and generated before it can be output;
this signal generation occurs on the internal baseband generator (Option 601 or 602). Once a
waveform has been created, it can be stored and recalled which enables repeatable playback of test
signals.
To begin using the Custom Arb Waveform Generator mode, select whether to create a single
modulated carrier or a multiple modulated carrier waveform:
• If you want to create a single modulated carrier waveform, start by selecting a Digital Modulation
Setup from a set of predefined modes (setups). Once a predefined mode is selected, you can
modify the Modulation Type, the Filter being used, the Symbol Rate, and the type of Triggering;
the Data Pattern is random by default. This modified setup can then be stored and reused.
• If you want to create a multiple modulated carrier waveform, start by selecting a Multicarrier
Setup from a set of predefined modes (setups). Once a predefined mode is selected, you can
modify the number of carriers to be created, the frequency spacing between each carrier, whether
the phase offset between each carrier is to be fixed or random, and the type of Triggering; the
Data Pattern is random by default, the Filter is set to 40 MHz by default, and the Symbol Rate is
automatically specified by the selected Modulation Type being used.
Working with Predefined Setups (Modes)
When you select a predefined mode, default values for components of the setup (including the filter,
symbol rate, and modulation type) are automatically specified.