Space Satellite Characterization

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Application Notes 2020.04.24

Better Satellite Link Distortion Testing

The capacity and complexity of space-based communications is growing exponentially. Signal power remains a key metric, and the need for more power across wider channels means that power amplifiers spend more time inside their nonlinear operating region. The result of this is signal distortion, and systems designers need to find ways to either reduce this distortion or work around it. Making accurate, insightful measurements of this distortion is the first step in solving the problem.

2020.04.24

Isolate And Measure Distortion

System designers rely on three key metrics — noise power ratio (NPR), adjacent channel power ratio (ACPR), and error vector magnitude (EVM) — to describe wideband distortion in their components or systems. Each of these methods is useful, but none provides a complete picture. The modulation distortion application for the PNA-X Vector Network Analyzer delivers the ability to do spectral correlation. This application note details how you can isolate and measure the distortion of a device under test (DUT) using spectral correlation and real-world test signals.

Download this application note to find out how you can:

Implement this vector network analyzer (VNA) based approach
Reduce or compensate for signal distortion
Achieve accurate modulated measurements at the radio and millimeter-wave frequencies

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Get To Know The Application

The S93070xB Modulation Distortion Application combined with the PNA-X Vector Network Analyzer and a Vector Signal Generator (VSG) enable users to measure the nonlinear behavior of power amplifiers under wideband modulated stimulus conditions. This new frequency-domain measurement method delivers low residual error vector magnitude (EVM) and rapid EVM measurement speed. The VNA-based vector calibration extends the reference planes of the signal generator and the analyzer to the device under test (DUT) planes, providing superior signal fidelity and accurate modulated measurements.