Measuring Power Supply Control Loop Response with Bode Plot II

Application Note Overview

Stability is one of the most important characteristics in power supply design. Traditionally, stability measurements require expensive frequency response analyzers (FRA), which are not always available in a laboratory. In response to this challenge, SIGLENT released Bode Plot Ⅱ features to the SIGLENT SDS1104X-E, SDS1204X-E, SDS2000X-E, SDS2000X Plus, and SDS5000X series of oscilloscopes. When combined with a SIGLENT arbitrary waveform generator (SDG or SAG) and an injection transformer, quick frequency response curves can be created.

This application note discusses the basic principles for making this stability measurement and provides a practical breakdown of utilizing these instruments for a power supply control loop measurement system.