Product Details

Signal Analyzers


Signal Analyzer:- About, Application, Types, and Selection:

RF and microwave signal analyzer is an instrument used to measure the phase, modulations, and magnitude of the signal at a single frequency within the IF bandwidth. Signal analyzers use digital techniques to extract information from the electrical signal.

  • The prime difference between the spectrum analyzers and signal analyzer is that the spectrum analyzer will measure the magnitude of received signals, whereas a signal analyzer measures any aspect of the received signal such as modulation.

The latest High-frequency signal analyzers will have an analog front end and the digital back end to achieve optimized measurement performance.

To learn more about RF systems, we recommend you to check the following Books.

To understand the signal analyzers better way, we recommend understanding the following associate components for the measurements.

In this RF and Microwave signal analyzers article, we will cover,

  • What are signal analyzers?
  • SpectrumAnalyzer Vs Signal analyzers.
  • Theory of operation and application of Signal Analyzer.
  • Main specifications need to consider in the selection of signal analyzers:
  • RF and microwave signal analyzers.

Difference between spectrum analyzer and signal analyzer:

A Spectrum Analyzer is an instrument used to measure the magnitude ( Power level) of an input signal at a particular frequency within the operating frequency range of the instrument.

  • Spectrum analyzers usually have one input and it measures only the power in some defined bandwidth.

A Vector Signal Analyzer is an RF and microwave instrument used to measure the magnitude and phase of an input RF signal within the IF bandwidth of the instrument. Vector Signal Analyzer mainly uses it to measure in-channel error vector magnitude, spectral flatness, code domain power, etc.

  • Vector Signal Analyzermight be analog or digital ( FFT analyzer) and have 2 or more inputs ports to measure both magnitude and phase of DUT. 

A Signal Analyzer will have combined features and the functions of a spectrum analyzer and a vector signal analyzer.

Design and Application

Theory of operation of Signal Analyzer:

Signal analyzers use a superheterodyne receiver to downconvert a portion of the received signal to an intermediate frequency and then filter for the analysis. The downconverter output inside the signal analyzer is then digitized for further processing, typically involving in-phase/quadrature (I/Q) sampling.

Through this complex sampling, all characteristics of the signal are preserved and measured. The digitizing sampling rate may vary in relation to the under consideration frequency span. 

Application of Signal Analyzer:

Signal analyzers can be used to perform the function of both spectrum analyzers and vector signal analyzers.

  • A signal analyzer measures magnitude parameters including phase noise, power level, distortion, etc of a signal.
  • A signal analyzer used to measure vector signal analysis parameters includes modulation, quality analysis, and demodulation.

Types of Signal Analyzers:

Signal analyzers are classified on the basis of the measurement features, the frequency range of operation, and on the base of the form factor. Bench-top and portable are the two major categories of signal analyzers available in the market.

Bench-top Signal analyzer:

Benchtop signal analyzers are AC power-operated instruments, designed to use in RF and microwave R&D, production, manufacturing lab environments. Benchtop signal analyzers usually have efficient heat dissipation mechanisms and measurement capabilities.

Portable Signal analyzer:

Portable signal analyzers are battery-operated units designed for field test and measurement applications. Portable signal analyzers are Lightweight and less power consumable units that allow the test engineers to move around the field for testing.

Basics & Selection Feature

Main specifications need to consider in the selection of a Signal Analyzer: 

When selecting a Signal Analyzer for the testing of RF and microwave signals, the following are the parameters needed to check to identify a suitable test and measurement instrument.

Frequency range and span:

The frequency coverage range of the Signal Analyzer indicates the lower and higher frequency signals it can measure. Span is the difference between the stop and the start frequency measurement capability.

Resolution bandwidth:

Resolution bandwidth or RBW filter is an IF bandpass filter in the IF path of the signal analyzer. Adjusting the Resolution bandwidth, help to discriminate the received signals with very closely spaced frequency components.

Video bandwidth:

The video bandwidth filter determines the two different power levels of discrimination in the samples of the signal analyzer. VBW will smooth the display.

Single Sideband (SSB) Phase Noise:

The phase noise measurement capability of the signal analyzer will help to identify the phase noise of the received signal. As the phase noise will affect the signal quality measurement of it is a prime challenge for the signal analyzer.

Maximum Input Level:

The input level of the signal analyzer indicates the maximum signal power level that can be fed to the analyzer for the down-conversion and processing.

RF Input VSWR:

Higher RF Input VSWR may lead to the reflection of the input signal to the DUT and it may lead to the damage of it. Need to check the signal analyzer with lower input VSWR.

Harmonic & Spurious:

The harmonic & Spurious measurement range of the analyzer should be better for the accurate measurement of the received signal.

Sweep Time:

The sweep time of the signal analyzer indicates the time it takes to sweep a received signal for the measurements. Lower the sweep time, better the performance and the speed of the analyzer measurement.


The signal analyzer is one of the prime test and measurement instruments in the analog and digital communication domain. Signal analyzers are available as a dedicated instrument and also associate with other instruments like communication analyzersvector network analyzers, etc.

Below are the top signal analyzers manufacturers, who can offer a different range of instruments for your rest requirements.

If you would like to add any further details of signal Analyzer to this article or would like to share with the public, please feel free to contact us over the contact or article submission page.

Thanks & Regards


Top Rated Manufactures
Copyright © 2022, AEnon Technologies PVT LTD All Rights Reserved