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相位裕度和增益裕度如何影响性能?

1、不同的相位裕度、不同的增益裕度对于性能是如何影响?例如,PM=20°/45°/80°,对于性能影响体现在哪部分?

2、如果要调整相位裕度、增益裕度的值,需要调整DCDC哪部分参数?