Combination Circuits

Binary to Gray Code converter

In this circuit we’ll convert BINARY numbers to GRAY numbers. Following is the truth table for it:

B3           B2          B1           B0           G3           G2          G1          G0

0.            0              0              0              0              0              0              0              0

1.            0             0             0              1              0              0             0             1

2.            0             0             1             0              0              0              1              1

3.            0              0              1              1             0             0             1             0

4.            0              1             0             0              0             1             1             0

5.            0              1             0             1             0             1              1              1

6.            0              1             1             1              0             1              0              0

8.            1              0             0             0              1              1             0             0

9.            1              0              0             1              1              1             0             1

10.          1              0              1             0             1              1              1             1

11.          1              0             1              1              1              1              1              0

12.          1              1             0              0              1              0              1              0

13.          1              1             0             1             1              0             1             1

14.          1              1             1             0             1              0              0             1

15.          1             1              1              1               1             0             0             0

K-MAPS:

K-MAP FOR G3:

Equation for G3= B3

K-MAP FOR G2:

Equation for G2= B3’ B2 + B3 B2’= B3 XOR B2

K-MAP FOR G1:

Equation for G1= B1’ B2 + B1 B2’= B1 XOR B2

K-MAP FOR G0:

Equation for G0= B1’ B0 + B1 B0’= B1 XOR B0

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