Why are source-load impedance measurements necessary? Distributed power systems can oscillate, especially when one or more switching power supplies are the loads of another power supply. Loads, especially switching power supplies with a high regulation bandwidth, draw constant power over the input voltage range and therefore look like an incremental negative resistance.
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Measuring the Input and Output Impedance of Power Supplies (Part 1)
An introduction to Dr. R. David Middlebrook's Design-Oriented Analysis
Measuring Impedance of Power Suppliers - Current Probe and Scale Factor (Part 2)
Measuring the Input and Output Impedance of Power Supplies (Part 3)
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Measuring Impedance of Power Supplies (Part 1)
Measuring Impedance of Power Supplies (Part 2)
Measuring Impedance of Power Supplies (Part 3)
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