How to Characterize Frequency Response in Power Supply Feedback Loops

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Advanced Benchtop Oscilloscope
+ Advanced Benchtop Oscilloscope
Advanced Benchtop Oscilloscope
+ Advanced Benchtop Oscilloscope

Evaluate Control Loop Response

Characterizing power supply feedback loops requires gain and phase measurements across frequency to show how the control path responds to an injected stimulus. Engineers use frequency response analysis (FRA) to observe loop behavior, review gain and phase margins, and determine whether the compensation network is producing the expected response under the selected operating conditions. The measurement setup must inject a swept sine signal into the loop and capture both the applied stimulus and the resulting response.

Injecting the stimulus and measuring the response requires an oscilloscope with built-in waveform generation and software that can calculate loop gain and phase across the sweep range. In this setup, the oscilloscope drives the loop with the swept signal while simultaneously measuring the response needed to generate a Bode plot. When configured correctly, this makes it possible to review control loop response, compare phase and gain behavior across frequency, and evaluate feedback-loop stability on the bench.

Power Supply Frequency Response Analysis Solution

Characterizing frequency response in power supply feedback loops requires an oscilloscope that can inject a swept sine stimulus and measure gain and phase across frequency. Keysight Advanced benchtop oscilloscopes have a built-in waveform generator to drive the loop with the swept sine signal and power measurement software for automated control loop response measurements. The oscilloscope and software work together to help engineers create Bode plots, characterize loop response, review phase and gain margins, and validate feedback-loop behavior more efficiently on the bench.
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See Block Diagram of Power Supply Frequency Response Analysis Solution

Block Diagram of Power Supply Frequency Response Analysis Solution

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