Thursday, February 7, 2013

Combinational Circuits (5)


  • A combinational circuit consists of logic gates whose outputs at any time are determined by the inputs using logic operations.
  • For n input variables, there are 2n possible binary input combinations.
  • For each binary combination of the input variables, there is one possible binary value
on each output.
  •  Hence, a combinational circuit can be described by
1. a truth table that lists the output values for each combination of the input variables, or
2. m Boolean functions, one for each output  variable.




Combinational Circuit Analysis

  • Analysis of a combinational circuit is the determination of the Boolean function that
the circuit implements.
  • The analysis starts with a given logic circuit diagram and ends with a set of Boolean
functions or (equivalently) a truth table.

 Example:



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