Published on April 11, 2014
11011J6066 1 AMSD ASSIGNMENT 4 COMPARATOR COMPARATOR: A common and very useful combinational logic circuit is that of the Digital Comparator circuit. Digital or Binary Comparators are made up from standard AND, NOR and NOT gates that compare the digital signals present at their input terminals and produce an output depending upon the condition of those inputs. For 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. The digital comparator accomplishes this using several logic gates that operate on the principles of Boolean algebra. There are two main types of digital comparator available and these are. 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 = 0 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 than A < B The purpose of a Digital Comparator is to compare a set of variables or unknown numbers, for exampleA (A1, A2, A3, .... An, etc) against that of a constant or unknown value such as B (B1, B2, B3, .... Bn, etc) and produce an output condition or flag depending upon the result of the comparison. For example, a magnitude comparator of two 1-bits, (A and B) inputs would produce the following three output conditions when compared to each other. Which means: A is greater than B, A is equal to B, and A is less than B (Source: http://www.electronics-tutorials.ws/combination/comb_8.html)
11011J6066 2 AMSD ASSIGNMENT 4 COMPARATOR CIRCUIT DRAWN ON CDESIGNER: WAVEFORMS:
11011J6066 3 AMSD ASSIGNMENT 4 COMPARATOR -Vin<Vref Waveform: -Vin>Vref Waveform:
11011J6066 4 AMSD ASSIGNMENT 4 COMPARATOR COMPARATOR WITH LATCH CIRCUIT ON CDESIGNER: WAVEFORMS: -Vin<Vref Waveform:
11011J6066 5 AMSD ASSIGNMENT 4 COMPARATOR -Vin>Vref Waveform:
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