Measuring the Input and Output Impedance of a DC-DC Converter

Part I   Measuring the Output Impedance of a DC-DC Converter

Here, we employ the SIMPLIS POP and AC analyses to measure the Output Impedance of a DC-DC Converter.  We demonstrate the test circuit required to add in parallel with the load in the DC-DC Converter schematic.  We then show how this measurement process can be automated by properly configuring the SIMPLIS Power Supply Load.

Part II   Measuring the Input Impedance of a DC-DC Converter

Using the SIMPLIS POP and AC analyses, we demonstrate the test circuit that must be added to the schematic between the source and the input of the DC-DC Converter.   This procedure can be automated by properly configuring the SIMPLIS Power Supply Source. 

By properly configuring both the SIMPLIS Power Supply Source and Load, you can perform time-domain transient analyses as well as frequency-domain Input and Output Impedance measurements and Bode Plots of the control loop response, all with a single schematic.