Even though op amps and comparators may seem interchangeable at first glance there are some important differences. Comparators are designed to work open-loop, they are designed to drive logic from their outputs, and they are designed to work at high speed with minimal instability. Op amps are not designed for use as comparators, they may saturate if over-driven which may cause it to recover comparatively slowly. Many have input stages which behave in unexpected ways when used with large differential voltages, in fact, in many cases, the differential input voltage range of the op amp is limited. And op amp outputs are rarely compatible with logic.
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Editorial
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DAC 2012 at San Francisco CA - Jun 3 - 7, 2012
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