带gainboost的运放出现doublet

首先我想问带gainboost的folded cascode 运放采用了 sc cmfb（包括辅助运放也用了）,这种情况怎么仿ac?是先确定反馈点的直流再去仿ac吗?其次，我的辅助运放的gbw》主运放的GBW了，为什么还会出现doublet?

已解决
1. Confiigure the simulator to run both a stb (or ac) and a transient simulation.
2. In the simulation window, go to Analysis-->Choose-->stb (or ac)-->options, and set "prevoppoint" to "yes". This tells the simulator to use the final value of the transient simulation as the operating point for the stb or ac simulation.
3. Run the simulation. The transient will run first, then the stb or ac will run using the final value from the transient as the operating point.

申明：网友回复良莠不齐，仅供参考。如需专业解答，请学习本站推出的微波射频专业培训课程。