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Comparator

Comparator can be designed to compare multi bit numbers. The figure below shows 2-bit comparator's block diagram

comparator

The comparator compares two unsigned number P and Q, and gives comparison result on three output pins A, B and C. Pin A goes high, if P is greater than Q; pin B goes high, if input P is equal to Q and pin C goes high, if the input P is less than Q.

Below is the truth table for comparator...

Inputs Outputs
    P1         P0         Q1         Q0    
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
    A         B         C    
0 1 0
0 0 1
0 0 1
0 0 1
1 0 0
0 1 0
0 0 1
0 0 1
1 0 0
1 0 0
0 1 0
0 0 1
1 0 0
1 0 0
1 0 0
0 1 0


This circuit can be easily implemented using karnaugh map, but for any application, I suggest you to explore availability of any comparator IC first.

 

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