Custom Arb Waveform Generator

Working with Modulation Types

 

 

Bits

 

 

 

 

 

Custom Real Time Only

 

Modulation Type

Per

Bit Rate =

Internal Symbol Rate

 

External Symbol Rate

 

Symbol

Symbols/s x Number of

(Minimum Maximum)

 

(Minimum Maximum)

 

 

 

 

 

 

Bits/Symbol

 

 

 

 

 

 

 

 

 

 

 

 

 

QAM

4QAM

2

90 bps 100 Mbps

45

sps 50 Msps

45

sps 25 Msps

Quadratu

 

 

 

 

 

 

 

 

16QAM

4

180

bps 200 Mbps

45

sps 50 Msps

45

sps 12.5 Msps

re

 

 

 

 

 

 

 

 

 

Amplitud

32QAM

5

225

bps 250 Mbps

45

sps 50

Msps

45

sps 10 Msps

e

 

 

 

 

 

 

 

 

 

Modulatio

64QAM

6

270

bps 300 Mbps

45

sps 50

Msps

45

sps 8.33 Msps

n

 

 

 

 

 

 

 

 

 

 

 

128QAM

7

315

bps 350 Mbps

45

sps 50

Msps

45

sps 7.14 Msps

 

There is no preset value for this

 

 

 

 

 

 

 

 

 

modulation, it must be user

 

 

 

 

 

 

 

 

 

defined.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

256QAM

8

360

bps 400 Mbps

45

sps 50

Msps

45

sps 6.25 Msps

 

 

 

 

 

 

 

 

 

 

Working with Modulation Types

The Modulation Type menu enables you to specify the type of modulation applied to the carrier signal when the Mod On Off hardkey is on.

When the Custom Off On softkey is on:

For Custom Arb, the BBG (baseband generator) creates a sampled version of the I/Q waveform based on a random data pattern and the modulation type that has been selected.

For Custom Real Time I/Q, the real- time custom I/Q symbol builder creates I/Q symbols based on the data pattern and modulation type that has been selected (see “Working with Data Patterns” on page 166 for information on selecting a data pattern).

In Custom Real Time I/Q, you can also:

Create user- defined modulation type (see page 156) that can be used immediately or saved to the Memory Catalog.

Restore all modulation parameters to their default state.

To Select a Predefined Modulation Type

1. Press Preset.

2. Press Mode > Custom > ARB Waveform Generator > Digital Mod Define > Modulation Type > Select or

Mode > Custom > Real Time I/Q Baseband > Modulation Type > Select

3. Select one of the available modulation types.

NOTE If you select QPSK and OQPSK, you must make a specific selection from the menu that displays.

Chpater 6

155

Page 169
Image 169
Agilent Technologies E8257D PSG, E8267D PSG manual Working with Modulation Types, To Select a Predefined Modulation Type

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.