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TMS320F280049C: C2000 compensation designer GUI 使用问题2 One Pole One Zero(Lead Lag)传递函数和相位特性不符

Part Number: TMS320F280049C
Other Parts Discussed in Thread: C2000WARE

C2000 compensation designer GUI中选择补偿器类型为Parallel PI(Pole Zero Tuning),

显示对应的传递函数为: G(s) = Kdc * (p1/z1)*(s + Z0)/ (s * (s +p1))

对于传递函数中包含 1/s(即积分器)的波特图相位起始位置应该为-90度。

但是实际图中显示为0度,请问这是为什么?谢谢。