The examples for these two simulators show how to simulate voltage loop gain. SIMPLIS has a special ac analysis for switched-mode power supplies. A method based on transient analysis that can be used for these circuits is presented in the FRA directory of the educational examples in the LTspice distribution. Both up and down steps should be examined, the step at the input should have the maximum amplitude and slew rate that the circuit might encounter in its application, and the circuit response should show no unwanted oscillation or ringing.įor circuits with several different states like switched-capacitor circuits or switched-mode power supplies, ac analysis is not valid. It is always a good idea to verify the results of a loop gain simulation with a transient analysis of the step response. This means that the results are only valid if the linearized circuit is a good approximation of the actual circuit. It is important to remember that for this analysis, the circuit is linearized around its operating point. The methods presented on this page use the small-signal ac analysis of SPICE and similar circuit simulators.
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