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UNIT II – COMBINATIONAL LOGIC
Part A – 2 Marks
1. Define Combinational circuit
A combinational circuit consist of logic gates whose outputs at anytime are determined directly from the present combination of inputs without regard to previous inputs.
2. Explain the design procedure for combinational circuits
Determine the number of available input variables & required O/P variables.Assigning letter symbols to I/O variablesObtain simplified Boolean expression for each O/P.Obtain the logic diagram.
3. What is code conversion?
If two systems working with different binary codes are to be synchronized in operation, then we need digital circuit, which converts one system of codes to the other. The process of conversion is referred to as code conversion.
4. What is code converter?
It is a circuit that makes the two systems compatible even though each uses a different binary code. It is a device that converts binary signals from a source code to its output code. One example is a BCD to Xs3 converter.
5. Analysis procedure for combinational circuits
Find the given circuit is combinational or sequential.Combinational circuit has a logic gate with no feedback paths or memory elements.A feedback path is a connection from the output of one gate to the input of second gate that forms part of the input to the first gate
6. Design procedure for combinational circuits
i) Determine the required number of inputs and outputs and assign a symbol to each.
ii) Derive the truth table that defines the required relationship between inputs and outputs.
iii) Obtain the simplified Boolean functions for each output as a function of the input variables.
iv) Draw the logic diagram and verify the correctness of the design.
7. What is a half-adder?
The combinational circuit that performs the addition of two bits is called a half-adder.
8. What is a full-adder?
The combinational circuit that performs the addition of three bits is called a full adder.
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Part A – 2 Marks
1. Define Combinational circuit
A combinational circuit consist of logic gates whose outputs at anytime are determined directly from the present combination of inputs without regard to previous inputs.
2. Explain the design procedure for combinational circuits
Determine the number of available input variables & required O/P variables.Assigning letter symbols to I/O variablesObtain simplified Boolean expression for each O/P.Obtain the logic diagram.
3. What is code conversion?
If two systems working with different binary codes are to be synchronized in operation, then we need digital circuit, which converts one system of codes to the other. The process of conversion is referred to as code conversion.
4. What is code converter?
It is a circuit that makes the two systems compatible even though each uses a different binary code. It is a device that converts binary signals from a source code to its output code. One example is a BCD to Xs3 converter.
5. Analysis procedure for combinational circuits
Find the given circuit is combinational or sequential.Combinational circuit has a logic gate with no feedback paths or memory elements.A feedback path is a connection from the output of one gate to the input of second gate that forms part of the input to the first gate
6. Design procedure for combinational circuits
i) Determine the required number of inputs and outputs and assign a symbol to each.
ii) Derive the truth table that defines the required relationship between inputs and outputs.
iii) Obtain the simplified Boolean functions for each output as a function of the input variables.
iv) Draw the logic diagram and verify the correctness of the design.
7. What is a half-adder?
The combinational circuit that performs the addition of two bits is called a half-adder.
8. What is a full-adder?
The combinational circuit that performs the addition of three bits is called a full adder.
thanks
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