Basic Digital Operation

Triggering Waveforms

•Polarity determines the state of the trigger to which the waveform responds (used only with an external trigger source); you can set either negative, or positive.

Source

The Trigger hardkey

A command sent through the rear-panel GPIB, LAN, or Auxiliary (RS-232)interface

An external trigger signal applied to either the PATTERN TRIG IN connector, or the PATT TRIG IN 2 pin on the AUXILIARY I/O connector (connector locations are shown in Figure 1-3 on page 18).

The following parameters affect an external trigger signal:

• The source (Input connector) of the external trigger signal (see page 104)

• The polarity of the external trigger (described on page 105)

• Any desired delay between when the PSG receives an external trigger and when the waveform responds to it (see page 104).

Mode and Response

The arbitrary waveform player provides four trigger modes; each mode has one or more possible responses:

•Single plays the waveform once. Arb formats have the following retriggering options:

—Off ignores triggers received during play; a trigger received after playback completes restarts the playback.

—On causes a trigger received during play to repeat the waveform after the current play completes.

—Immediate causes a trigger received during play to immediately restart the waveform.

•Gated causes the waveform to wait for the first active trigger signal state to begin transmission, then repeatedly start and stop in response to an externally applied gating signal (example on

page 105). You select the active state with the Gate Active Low High softkey (see page 105).

In an ARB format, the waveform plays during the inactive state, and stops during the active state.

In real- time Custom, behavior depends on whether the signal incorporates framed or unframed data.

Because the PSG provides only unframed data, to transmit a framed data signal you must create an external file that incorporates the framing and download it to the PSG (see the E8257D/67D PSG Signal Generators Programming Guide).

—Unframed data transmits during active states, and stops during inactive states. The signal stops at the last transmitted symbol and restarts at the next symbol.

—Framed data starts transmitting at the beginning of a frame during active states, and stops at the end of a frame when the end occurs during inactive states. If the end of the frame extends into the next active state, the signal transmits continuously.

Chapter 3

103

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Agilent Technologies E8257D PSG, E8267D PSG manual Source, Mode and Response
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E8267D PSG, E8257D PSG specifications

Agilent Technologies, a recognized leader in electronic measurement and communications solutions, offers a comprehensive range of signal generators, including the E8257D PSG (Pulsed Signal Generator) and E8267D PSG. These instruments are engineered to meet the demanding requirements of wireless communication, aerospace, defense, and various research applications.

The E8257D PSG is known for its versatility and reliability. It operates within a frequency range of 250 kHz to 40 GHz, making it suitable for a wide array of applications, from signal generation to vector modulation. With an output power capability of up to +30 dBm, it delivers high-quality signals with exceptional precision. Its low phase noise performance is especially critical for applications such as radar and communication system testing, where signal integrity is paramount.

One of the standout features of the E8257D is its advanced modulation capabilities, including analog and digital modulation schemes. This flexibility allows engineers to simulate real-world communications environments accurately. The PSG also features a built-in arbitrary waveform generator that enables users to create complex waveforms tailored to specific testing needs, providing a significant advantage in research and development.

On the other hand, the Agilent E8267D PSG is designed to cater to the needs of users requiring a combined signal generation and analysis solution. With the capability to generate signals from 250 kHz to 67 GHz, the E8267D is ideal for millimeter-wave applications, as well as testing next-generation wireless technologies.

This model includes features such as enhanced phase noise performance and faster switching speed, which are crucial for signal integrity in sophisticated networks. The instrument's intuitive user interface and powerful software integration facilitate effortless operation and automation, thereby improving workflow efficiency.

Both the E8257D and E8267D PSG instruments incorporate cutting-edge technologies such as low-noise microwave and RF components, as well as digital signal processing capabilities. They provide users with enhanced accuracy and reliability in their measurements.

In summary, Agilent Technologies' E8257D and E8267D PSG signal generators represent the pinnacle of precision in signal generation technology. With their extensive feature sets, advanced modulation capabilities, and robust performance specifications, these instruments are invaluable tools for engineers and researchers working across various high-tech industries.
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