Custom Arb Waveform Generator

Working with Filters

12.Enter a file name (for example, EDGEM1) using the alpha keys and the numeric keypad, and press

Enter.

The user- defined multicarrier digital modulation state is now stored in non- volatile memory.

NOTE The RF output amplitude, frequency, and operating state settings (such as RF On/Off) are not stored as part of a user- defined digital modulation state file. For more information, refer to “Using Data Storage Functions” on page 55.

Recalling a User-Defined Custom Digital Modulation State

In this procedure, you learn how to select (recall) a previously stored custom digital modulation state from the Memory Catalog (the Catalog of DMOD Files).

1.Press Preset.

2.Press Mode > Custom > ARB Waveform Generator > Setup Select.

3.Press More (1 of 2) > Custom Digital Mod State.

4.Press Select File to select a custom modulation state from the Catalog of DMOD Files.

The user- defined custom digital modulation state should now be recalled from non- volatile memory. Because the RF output amplitude, frequency, and operating state settings are not stored as part of a user- defined digital modulation state file, they must still be set or recalled separately. For more information, refer to “Using Data Storage Functions” on page 55.

Working with Filters

This section provides information on using predefined (page 147) and user- defined (page 148) FIR filters.

NOTE The procedures in this section apply only to filters created in either the Custom Arb Waveform Generator or Custom Real Time I/Q Baseband mode; they do not work with downloaded files, such as those created in Matlab.

The Filter menu selections enable you to apply a filter to the generated signal, define a finite impulse response (FIR) filter, change a Root Nyquist or Nyquist filter alpha, change a Gaussian filter BbT, or restore all filter parameters to their default state. In Custom Real Time I/Q mode, you can also optimize a FIR filter for Error Vector Magnitude (EVM) or Adjacent Channel Power (ACP)

Predefined Filters (Filter > Select)

•Root Nyquist is a root- raised cosine pre- modulation FIR filter. Use a Root Nyquist filter when you want to place half of the filtering in the transmitter and the other half in the receiver. The ideal root- raised cosine filter frequency response has unity gain at low frequencies, the square root of raised cosine function in the middle, and total attenuation at high frequencies. The width of the middle frequencies is defined by the roll off factor or Filter Alpha (0 < Filter Alpha < 1).

•Nyquist is a raised cosine pre- modulation FIR filter. You can use a Nyquist filter to reduce the bandwidth required by a signal without losing information. The ideal raised cosine filter frequency response comprises unity gain at low frequencies, a raised cosine function in the

146

Chpater 6

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Agilent Technologies E8267D PSG Working with Filters, Recalling a User-Defined Custom Digital Modulation State, Enter
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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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