Digital comparison is considered an important method used in digital systems while executing arithmetic or logical operations. It’s designed to compare the relative magnitudes of binary numbers. This comparison is used to test whether one number represented by one binary word is greater than, equal, or less than the other number. Two main types of digital comparators are available—an Identity comparator and a Magnitude comparator.
This article discusses the implementation of an 8-bit Identity comparator and a 4-bit Magnitude comparator, covering both the concept and the circuit design. We used an Arduino program to execute an automatic test for this design. The program presents all possible binary combinations to the GreenPAK comparator inputs and checks the matching output.