How to Measure Power Supply Loop Gain and Phase

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

Measure Loop Response Across Frequency

Measuring power supply loop gain and phase requires applying a swept sine stimulus to the feedback network and comparing the input and output response across frequency. Frequency response analysis (FRA) performs gain and phase measurements at multiple frequency points to produce Bode plots that show how the control loop responds throughout the selected sweep range.

Performing the test requires an oscilloscope with a built-in waveform generator, two measurement paths, and automated FRA software. Engineers configure the start and stop frequencies, number of test points, input and output channels, and stimulus amplitude before running the sweep. The resulting gain and phase traces provide a frequency-domain view of the power supply feedback loop's response.

Power Supply Loop Response Measurement Solution

Measuring power supply loop gain and phase requires a test setup that can inject a swept sine stimulus and compare the feedback network's input and output response across frequency. An Advanced benchtop oscilloscope uses its built-in waveform generator as the stimulus source while two oscilloscope channels capture the input and output signals. Automated frequency response analysis software measures gain and phase at each test frequency and generates overlaid Bode plots versus frequency. Engineers can configure sweep range, test-point density, stimulus amplitude, and amplitude profiling to optimize the measurement for the feedback network under test.
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See Block Diagram of Power Supply Loop Response Measurement Solution

Block Diagram of Power Supply Loop Response Measurement Solution

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