Combinational networks

Boolean algebra is used in the analysis and design of logic systems. Gates and flip-flops are the common logic elements in logic systems. Gates are electronic circuits whose output depends upon the Boolean operations and flip-flops are memory elements which stores logic constants. A combinational network or a logic network is the interconnections of gates and flip-flops. An electronic circuit in which the output signal is a logic-1 (High) if and only if all its input signals are logic-1 (High) is called an AND gate. An electronic circuit in which the output signal is logic-1 (High) if and only if at least one of its input signals is a logic-1 (High) is called an OR gate. A NOT gate is an electronic circuit where the output signal is always opposite to that of the input signal. In a combinational network, outputs at any time are determined by the inputs at that particular time. A combinational network is called acyclic network since there is no closed loops or feedback paths. In a sequential network, outputs are dependent upon the current input currents and previous input currents.