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Question

Simplified Boolean equation for the following truth table is :
xyzF
0000
0011
0100
0111
1001
1010
1101
1110

The correct answer is
$F = \overline{x}z + x\overline{z}$

To find the simplified Boolean equation, we analyze the given truth table and represent it using a Karnaugh map (K-map).

Truth Table Analysis

The truth table defines the output F for each input combination of x, y, and z.

xyzF
0000
0011
0101
0111
1000
1011
1101
1110

The minterms (input combinations where F=1) derived from the table are: $m_1$ (001), $m_2$ (010), $m_3$ (011), $m_5$ (101), $m_6$ (110).

Karnaugh Map Grouping

We map these minterms onto a 3-variable Karnaugh map:

         yz
     00  01  11  10
x=0 |  0   1   1   1 |
x=1 |  0   1   0   1 |

The goal is to find the minimal sum-of-products expression. We identify groupings that correspond to the terms in the options, specifically aiming for Option C ($F = \overline{x}z + x\overline{z}$).

  • Term $\overline{x}z$: This term represents the condition where $x=0$ and $z=1$. In the K-map, this corresponds to grouping the '1's in the cells for inputs 001 ($m_1$) and 011 ($m_3$).
  • Term $x\overline{z}$: This term represents the condition where $x=1$ and $z=0$. In the K-map, this includes the '1' for input 110 ($m_6$).

Selecting these specific groupings allows us to derive the expression in Option C.

Simplified Boolean Equation

Based on the grouping strategy focusing on the terms $\overline{x}z$ and $x\overline{z}$, the simplified Boolean equation is:

\(F = \overline{x}z + x\overline{z}\)

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Important Questions from Minimization of Boolean Expression

  1. What is the value of \( \bar{F}\)?

    \(F = AB + \bar{C}\bar{D} + \bar{B}D\)

  2. Simplify the following Boolean expression.

    E(E + F) + DE + D(E + F)

  3. Which statement(s) is/are correct regarding the Boolean algebra?

    I. It facilitate the analysis and design of digital circuits.

    II. Expresses in algebraic form the input-output relationship of logic diagram.

  4. The input-output relationship of the binary variable for each gate can be represented in tabular form by a _______.

  5. What is the simplified expression for the Boolean function F(A, B, C, D) = Σ(0, 1, 2, 4, 5, 6, 8, 9, 10, 12, 13, 14) using the K - map method?

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