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Definition of "Comparator" |
A comparator is a device that accepts two analog inputs, compares the inputs, and produces a binary output that is a function of which input is higher. If the non-inverting (+) input is greater than the inverting (-) input, then the output goes high. If the inverting (-) input is greater than the non-inverting (+) input, then the output goes low. When described that way, the comparator resembles a 1-bit ADC. A simple comparator can be achieved using an op amp without negative feedback. Its high voltage gain enables it to resolve very small differences in input voltage. But op amps used this way are generally slower than comparators and lack special features, such as hysteresis and internal references. Application Note 886: Selecting the Right Comparator goes into more details on how comparators work, their specifications, common comparator features, and how to select a comparator that best fits your needs. / A component that compares two analog variables and indicates the result of that comparison [see Voltage Comparator]. A device that compares two items of data and indicates the result of that comparison [8-input Magnitude Comparator]. / A comparator is a device that accepts two analog inputs, compares the inputs, and produces a binary output that is a function of which input is higher. If the non inverting (+) input is greater than the inverting (-) input, then the output goes high. If the inverting (-) input is greater than the non inverting (+) input, then the output goes low. / (1) a logic element that compares two binary numbers (A and B) to determine |
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