Agilent Technologies, Inc. E4438C-403 Calibrated noise personalities

Signal Creation

• Add AWGN to any waveform played out of the baseband generator
• Generate stand alone AWGN for use as a general purpose noise source
• Set AWGN level as a C/N ratio from the front panel
• Set Eb/No, Ec/No, or C/N from Signal Studio Software

Real-Time Mode

• Noise bandwidth: 50 kHz to 80 MHz
• Crest factor: 16 dB
• Randomness: 89 bit pseudo-random generation
• Repetition period: 3 x 10E9 years

Arbitrary Waveform Mode

• Noise bandwidth: 50 kHz to 15 MHz
• Randomness: 14, 15, 16, 17, 18, 19, or 20-bit pseudo-random waveform with fixed or random seed
• Repetition period: .4 ms to 2 s (dependent on noise BW & waveform length combination)

Other Features

• Internal software application built-in to signal generator firmware; no PC required

Transform the ESG into a Flexible Noise Source

Option 403 quickly and conveniently transform the ESG into a flexible additive white Gaussian noise (AWGN) source with a few simple keystrokes. The calibrated noise personality provides two modes of operation: real-time and arbitrary waveform playback. Real-time mode generates truly uncorrelated noise with a noise bandwidth that can be continuously varied up to 80 MHz. Arbitrary waveform playback mode enables the generation of a repeatable noise sequence with a variable bandwidth up to 15 MHz.

Sum Calibrated AWGN with Signals from the ESG

Precisely adjust the noise power with digital accuracy by setting Eb/No, Ec/No, or C/N directly from the user interface of many signal creation software applications (listed below). The software automatically queries the properties of the selected reference channel to ensure the appropriate amount of noise is added when setting Eb/No and Ec/No. Also add noise directly from the dual ARB menu to any arbitrary waveform played back using the ESG internal baseband generator.

Internal Baseband Generators

• See Option 601, Internal baseband generator (8 MSa)
• See Option 602, Internal baseband generator (64 MSa)

Typical Application

The calibrated noise personality is recommended for flexible stand-alone AWGN generation and for setting signal-to-noise ratios directly within select E4438C ESG signal creation software. The uncorrelated nature of the test stimulus is ideal for generating noise interference and is especially important for determining receiver performance. The arbitrary waveform playback mode provides a repeatable noise stimulus used to isolate and debug the cause of received bit errors under various signal-to-noise ratio conditions.

This option can be added as a product upgrade.