德州仪器-将运算放大器用作比较器—此举可行吗？

德州仪器-将运算放大器用作比较器—此举可行吗？
许多人偶尔会把运算放大器当比较器使用。一般而言，当您只需要一个简单的比较器，并且您在四运算放大器封装中还有一个“多余”运算放大器时，这种做法是可行的。稳定运算放大器运行所需的相位补偿意味着把运算放大器用作比较器时其速度会非常的低，但是如果对速度要求不高，则运算放大器可以满足需求。偶尔会有人问到我们运算放大器的这种使用方法。这种方法有时有效，有时却不如人们预期的那样效果好。为什么会出现这种情况呢？

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Op Amps used as Comparators—is it okay?
Bruce Trump

Tags：op amps, LM324, Comparators, LM358, OPA244, OPA234, OPA2251
Many of you (and I, too) occasionally use an op amp as a comparator. Often,
this is when you only need one simple comparator and you have a “spare” op
amp in a quad op amp package. The phase compensation required for stable op
amp operation means that it will be very slow as a comparator, but if speed
requirements are modest, the op amp may suffice. We get sporadic questions
about this use of an op amp. Some work okay… some don’t operate as
expected. Why?...
Many op amps have voltage clamps between the input terminals, most often
implemented with back-to-back diodes (sometimes with two or more diodes in
series). These diodes protect the input transis