Construction of truth table indicating the relationship between the input and output variables.Expressing the input and output variable’s relationship.Representing symbols (alphabets) for each and every input and output variables.Identification and determination of number of available input variables and required output variables.In the above figure, the circuit accepts the binary variables and depending on the logical combination of gates it generate outputs.ĭesign Procedure of Combinational Logic CircuitsĪ combinational circuit can be designed using the following steps. So the result of above generalized combinational logic circuit can be expressed by m Boolean expressions. By a Boolean expression of input variables, each output is expressed. In the above figure, there are n input variables and hence there will be 2n possible combinations of bits at the input. The figure below shows the schematic representation of a generalized combinational logic circuit consisting of n input variable and m output variables. The required output data is obtained from this process by transforming the binary information given at the input. The logic gates accepts the inputs and depending on the type of functioning of the logic gate,output signals are generated from them. By using the combination of logic gates more complex combinational circuits can be implemented such as multiplexers and de-multiplexers, comparators, adders and subtractors, etc.Ī combinational circuit comprises of input variables, logic gates and output variables. The logic gates are the fundamental building blocks of a combinational circuit. The term combination logic means combining of two or more logic gates to form a required function where the output at a given time depends only on the input. Classification of Combinational Logic CircuitsĪ combinational logic circuit is one in which the present state of the combination of the logic inputs decides the output.Design Procedure of Combinational Logic Circuits.
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