Measuring The Negative Input Resistance Of DC-DC Converters

Measuring the negative resistance of a DC-DC converter’s input requires introducing a perturbation of the input voltage while measuring the input voltage and the input current. Using a frequency response analyzer (FRA) or vector network analyzer (VNA), the modulated voltage divided by the resulting modulated current provides a direct measurement of input impedance. The Picotest J2121A line injector simplifies this measurement by integrating a modulator and a hall current monitor into a single device.

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