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You may notice two distinct features about the comparator from the above truth table. Then the operation of a 1-bit digital comparator is given in the following Truth Table. Consider the simple 1-bit comparator below. For example, produce an output from a counter when a certain count number is reached. This is useful if we want to compare two variables and want to produce an output when any of the above three conditions are achieved. Which means: A is greater than B, A is equal to B, and A is less than B Magnitude Comparator - a Magnitude Comparator is a type of digital comparator that has three output terminals, one each for equality, A = B greater than, A > B and less thanA B,A=B,A

Identity Comparator - an Identity Comparator is a digital comparator that has only one output terminal for when A = B either "HIGH" A = B = 1 or "LOW" A = B = 0Ģ. There are two main types of Digital Comparatoravailable and these are. The digital comparator accomplishes this using several logic gates that operate on the principles of Boolean algebra. Digital or Binary Comparators are made up from standard AND, NORand NOT gates that compare the digital signals present at their input terminals and produce an output depending upon the condition of those inputs.įor example, along with being able to add and subtract binary numbers we need to be able to compare them and determine whether the value of input A is greater than, smaller than or equal to the value at input B etc.