Here, the output responds with a "high" digital signal, whenever the voltage at the non-inverting (+) input is higher than the inverting (-) input.
An op amp output can work without any pull up or pull down resistors, but a comparator will always require an external pull-up or pull down resistor to enable the output stage to work normally.In contrast, a comparator output can be either open or grounded (negative), or floating. In powered condition, the output of an op amp will be either positive or negative, depending on the input pin voltage levels, but can never be open.However, the output response of these two forms of comparators may have a few major differences.Īlthough an op amp and a comparator both can be configured to compare differential signals at their input pins, the main differences between the two counterparts are: You will find both these units having an identical "triangle" shaped device symbol internally, which we normally recognize and use for drawing comparator circuits. The IC 741 is an ideal example of a single op amp, and the IC LM311 can be considered a good example of a dedicated single comparator.
311 transistor high res how to#
In this article we will elaborately learn how to correctly design comparator circuits using popular ICs like IC 741, IC 311 and IC LM339 Difference Between a Comparator and Op Amp
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