How to Measure Spurious Emissions in RF Designs

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Essential Signal Analyzer
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Essential Signal Analyzer
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Measure Low-Level RF Spurious Signals

Identifying spurious emissions requires measuring the frequency spectrum of the device under test across a defined frequency range. Comparing the fundamental signal with harmonics and other unwanted spectral responses reveals their frequency and amplitude and provides the measurement data needed to characterize spurious behavior across the selected measurement span.

A spectrum analyzer sweeps the selected frequency range and measures signal power as a function of frequency. Engineers can adjust resolution bandwidth to distinguish low-level and closely spaced signals, use peak search and frequency markers to locate individual responses, and examine the resulting spectrum trace to characterize the fundamental, harmonics, and spurious signals under consistent measurement conditions.

Spurious Emissions Measurement Solution

Measuring spurious emissions requires a frequency-domain measurement with sufficient frequency coverage, sensitivity, and resolution to distinguish unwanted responses from the fundamental signal and displayed noise floor. Keysight Essential signal analyzers measure frequency, power, harmonics, and spurious signals across frequency ranges up to 20 GHz, depending on the model. Engineers can adjust resolution bandwidth from 10 Hz to 3 MHz to examine low-level and closely spaced signals, use peak search and markers to locate responses and measure their frequency and amplitude, and apply window limits for frequency-and-power pass/fail evaluation. Combining these measurements provides a repeatable method for characterizing spurious responses across the selected frequency range.
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How to Measure Spurious Emissions in RF Designs Block Diagram

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