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您好,pi型滤波器主要是为了消除输出固定频点的噪声,并不是必须,需要以需求为导向,结合实际电路调试和测试结果进行添加。因为您的设计多个并联环路输出结构有变化,如果输出端结果与典型应用相似,理论上一个pi型结构就可以。每个节点添加一个有助于避免相互干扰,动态性能会更好。