Use op-amp injection for Bode analysis

摘要

BODE ANALYSIS is an excellent way to measure small-signal stability and loop response in power-supply designs. Bode analysis monitors gain and phase of a control loop. It performs this monitoring by breaking the feedback loop and injecting a signal into the feedback node and then comparing the injected signal with the output signal of the control loop. The method requires a network analyzer to sweep the frequency and compare the injected signal with the output signal. The most common method of injection is the use of transformer.