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Using Op Amps as Comparators
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2009-09-02
李丽
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A comparator is a device with two input terminals, inverting and noninverting, and an output that usually swings from rail to rail. So is an op amp.
A comparator has low offset, high gain, and high common-mode rejection. So does an op amp.
So what is the difference? A comparator has a logic output that indicates which of the two inputs is at a higher potential. If its output is TTL or CMOS compatible (and many comparators are), it is always intended to be at one rail or the other—or making a rapid transition between the two.
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