# Electrical engineering – Combinational Circuit Design

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Combinational Circuit Design

1 – Design a combinational circuit with three inputs and six outputs.  The output binary number should be the square of the input binary number.  Provide a truth of the combinational circuit. Minimize the six output functions using K-maps, and draw the logic diagram for the circuit.

2 – Design a combinational circuit with four inputs and four outputs.  The output generates the 2’s complement of the input binary number.
Follow the design procedure outlined above.

3 – A two-seat sports car has a seat-belt system that is designed so that the car cannot be started until all occupants have buckled their seat belts.

a) Construct a truth table indicating the requirements for starting the car (START).  Note that the car may be started without the passenger (PAS) present but not without the driver (DRV).  Let DRVBLK and PASBLK represent the driver buckled and passenger buckled, respectively.

b) Obtain the minimized Boolean expression for the output function.

c) Implement the logic.

4. Design a 4-bit Gray code to Binary converter.