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反馈电阻上并联的电容是什么作用?

查阅相关之后发现有相位补偿和滤波的作用,相位补偿一般都是pf级的电容,我一般都把这个电容当做低通滤波器,有时候感觉还是挺糊涂的,麻烦指点一下。 还有输出端为什么接一个二极管?