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N7621B Signal Studio for Multitone Distortion

Technical Overviews

  • Create Keysight Technologies, Inc. validated and performance optimized multitone and noise power ratio (NPR) signals for testing narrowband components and receivers for communications systems
  • Configure distortion-free two-tone and multitone test signals, with up to 4097 tones (IMD suppression > 70 dBc)
  • Configure an NPR test stimulus with more than 2 GHz noise BW, notch depth > 60 dBc, and ± 0.5 dB noise flatness
  • Control magnitude and phase (random, parabolic, or constant phase) for individual tones with presets across tones to control CCDF characteristics
  • Automate signal configuration and generation using the COM and .NET API and sequence waveforms with API for smooth transition between signals
  • Accelerate the signal creation process with a user interface based on parameterized and graphical signal configuration and tree-style navigation

Simplify Multitone Signal Creation

Keysight Signal Studio software is a flexible suite of signal-creation tools that will reduce the time you spend on signal simulation. For component and system verification, Signal Studio’s performance-optimized reference signals—validated by Keysight—enhance the characterization and verification of your devices. Through its application-specific user-interface you’ll create standards-based and custom test signals for component, transmitter, and receiver test.

Component and transmitter test

Signal Studio’s enhanced multitone capabilities use waveform playback mode to create and customize waveform files needed to test components and transmitters. Its user-friendly interface lets you configure signal parameters, calculate the resulting waveforms and download files for playback.

Parametric test of components, such as amplifiers and filters

Performance characterization and verification of RF sub-systems

Maximize output power for higher power system test

Verify subsystems or satellite transponders with NPR test

Signal Studio’s NPR option enables the creation of a large number of tones to simulate Gaussian Noise with a notch in it. The individual tone properties are not directly accessible by the user. The NPR application provides methods to define the noise signal including the noise bandwidth (number of ones and tone spacing), the phase type (random, parabolic, and constant) and the notch width and offset from the noise center. The NPR interface also allows the user to specify the IMD correction level desired within the notch (in-band corrections).

Wideband IF/RF/microwave waveform generation for testing any point in the system

Variable parameters and corrections for more stringent satellite testing requirements

Signal Studio’s enhanced multitone capabilities allow you to create waveforms for component and sub-system verification. Easy signal creation allows you to create custom multitone waveforms for maximization of test equipment output power while being able to mimic the newer communications waveforms to verify amplifiers, filters, and converters.

The application offers an advanced correction routine which can suppress distortion products both in-band or out-of-band. This enables users to push the power output of the hardware, decreasing the need for external gain which is costly and adds impairments to the waveform.

-Advanced correction routines to suppress distortion products both in and out of band maximizing the power of your test equipment

-Calibrated measurements to the DUT, including extra elements in the test fixture such as switches or other amplifiers

-Set parameters such as phase on each tone to mimic OFDM, or CDMA waveforms with higher peak-to-average power characteristics

-Maximize power for both narrow and wideband testing needs all the way to the DUT by using amplitude and advanced distortion corrections

-Use the API for control of the software remotely for systems that are remote

-View CCDF, and spectrum graphs to verify the desired power profile
Signal Studio for multi-tone enables users to easily generate an appropriate noise stimulus for wideband components or subsystems such as satellite transponders. Signal Studio creates several thousand closely spaced discrete frequencies that are level in amplitude across the band of interest.

NPR test is ideal to characterize intermodulation distortion performance in an objective and quantitative manner while simulating worst-case loading conditions. Traditional creation of a wideband NPR signal required the use of a wideband noise generator with a notch filter. While this test was effective for determining performance, it lacks repeatability and can be very costly. Signal Studio for multitone and NPR does a much better job of creating these signals at a lower cost than the analog approach.

The digital noise generation technique used by Signal Studio produces an ideal NPR test stimulus which brings advantages to traditional approaches:

-A calibrated flat amplitude accurate signal which can include noise statistics for more accurate crest factor test that is a great indication of the “stress factor” of the device or device under test (DUT)

-Sharp spectral shape definition unlike an analog approach gives a much more accurate and repeatable measurement result

-Very predictable and repeatable signal shape for consistent testing across devices and projects

-Proprietary algorithm can significantly improve notch depth and other distortion products to maximize capability of test equipment to give a significant improvement in NPR measurement error

-Calibrate measurement all the way to the device, correcting for both test equipment and other elements in the test fixture

-Works in conjunction with the highest performance hardware which provides very large bandwidths with high dynamic range

With the ability to generate precise and repeatable stimulus for NPR measurements, the digital method of determining NPR is in many ways superior to analog methods for evaluating the effects of intermodulation distortion in amplifiers and other communications devices.

By simplifying the process of generating a digital test stimulus, Signal Studio for multitone distortion makes evaluation of non-linear distortion characteristics faster and easier.

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