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Understand the Source of Your Noise

Noise is a fundamental aspect of all electrical circuits and is caused by thermal generation. In RF circuits, the noise can also be caused by electrical interference, conducted noise, and inadequate shielding. Measuring and managing the noise floor of your device is an effective way to ensure signal-to-noise ratio (SNR) is optimal. Different instruments can be used to measure SNR. A spread spectrum signal, for example, may require a dedicated measurement instrument like a noise figure analyzer, while a more traditional continuous wave (CW) signal can be measured using a signal analyzer. A noise source may also be added to simulate a challenging environment, enabling you to measure the noise immunity of your product.

Knowing how to make reliable RF noise measurements allows you to identify the source of your noise and design better products. In fact, noise is a key parameter for predicting how well your RF product is going to perform. It affects the quality of service, such as bit error rate, latency, throughput, and ultimately, the user experience.

Application Note

Fundamentals of RF and Microwave Noise Figure Measurements

Data Access Anywhere

Explore a full range of noise source options

Make noise figure measurements from 10 MHz to 50 GHz accurately and reliably

Data Access Anywhere

Automate SNR measurement

Improve efficiency and quality with the powerful Test Executive software to automate testing

Data Access Anywhere

Minimize noise figure uncertainties

Use high performance noise figure analyzer to make fast, accurate, and repeatable noise figure measurements

Keysight RF SNR Measurement Solution

The NFA X-Series Noise Figure Analyzer, along with a Keysight Noise Generator forms an SNR measurement network. By integrating TestExec SL Software, you can automate testing in a manufacturing environment to improve efficiency and quality.

Watch the RF SNR Solution Demo

Learn More About RF SNR Measurement

How to Make Noise Figure Measurements for a Simple Converter

How to Calculate Noise Figure Uncertainty Using Fieldfox

How to Use the NFS X-Series Noise Figure Analyzer

Additional Resources

Data Sheets 2020.11.24

NFA X-Series Noise Figure Analyzer, Multi-touch N8973B, N8974B, N8975B, N8976B

NFA X-Series Noise Figure Analyzer, Multi-touch N8973B, N8974B, N8975B, N8976B

This data sheet is a summary of the specifications and conditions for NFA X-Series Noise Figure Analyzers.

2020.11.24

Application Notes 2019.09.30

Fundamentals of RF and Microwave Noise Figure Measurements

Fundamentals of RF and Microwave Noise Figure Measurements

Explore information on RF and Microwave noise figure measurements, starting from the concept of noise figure and noise temperature, describing the noise characteristics of two-ports networks, and highlighting the different methods used to measure noise figure, such as Y-Factor and the Direct Noise measurement method.

2019.09.30

Application Notes 2019.09.24

Noise Figure Measurements: 10 Hints

Noise Figure Measurements: 10 Hints

Noise figure is often the key to characterizing a receiver and to detect weak incoming signals. Learn to minimize uncertainties in your noise figure measurements.

2019.09.24

Application Notes 2021.01.24

Noise Figure Measurement Accuracy: The Y-Factor Method

Noise Figure Measurement Accuracy: The Y-Factor Method

This app note discusses the fundamentals of noise figure measurement using Y-factor method and how to avoid noise figure mistakes.

2021.01.24

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