文献[1]中对非最小相位系统的一些命题是不能成立的。为使讨论有一个共同的前提,仍采用该文献中所提出的定义。 定义:如果系统中至少有一个极点或零点位于右半s平面,则系统称为非最小相位系统。 原命题1:稳定的非最小相位系统具有负的相位裕量和增益裕量。 可以用一个实际传递函数证明这个命题不能成立。 Some propositions of non-minimum phase system in [1] can not hold. In order to make the discussion have a common premise, the definition proposed in this document is still adopted. Definition: If at least one pole or zero in the system is in the right half of the s-plane, the system is called a non-minimum phase system. Proposition 1: A stable non-minimum phase system has negative phase margin and gain margin. An actual transfer function can be used to prove that this proposition does not hold.