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开环增益相位

Other Parts Discussed in Thread: TLV9001, TLV379

请问,在运放datasheet 中的开环增益相位随频率变化的曲线图中,随着频率的增加,有的图中相位从0到-180度的方向变化,而有的图中相位从180到0度的方向变化。这是为什么呢?

比如TLV9001(180度到0度方向),TLV379(0度到 - 180度方向)两者的开环增益相位曲线画法不同。