An, etc) against that of a constant or unknown value such as B (B1, B2, B3, …. The purpose of a Digital Comparator is to compare a set of variables or unknown numbers, for example A (A1, A2, A3, …. Magnitude Comparator – a Magnitude Comparator is a digital comparator which has three output terminals, one each for equality, A = B greater than, A > B and less than A < B Identity Comparator – an Identity Comparator is a digital comparator with only one output terminal for when A = B, either A = B = 1 (HIGH) or A = B = 0 (LOW) There are two main types of Digital Comparator available and these are. The digital comparator accomplishes this using several logic gates that operate on the principles of Boolean Algebra. The binary or digital comparator can be constructed using standard AND, NOR and NOT gates to 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.
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