# UNIT 02 MSI Devices | Digital System Design Important Questions AKTU B.tech

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Important Questions For Digital System Design:
*Unit-01     *Unit-02
*Unit-03    *Unit-04
*Unit-05    *Short-Q/Ans
*Question-Paper with solution 21-22  ```

## Que 1. Design and explain the logic and circuit of a 4-bit magnitude comparator.  | OR |Design a 4-bit magnitude comparator using one bit comparator modules.| OR |Draw and explain the 4-bit magnitude comparator.

4-bit magnitude comparator using logic gates.

## Que 6. Draw a BCD adder circuit and explain its working.| OR | Draw a decimal adder to add BCD number.

1. A BCD adder is a circuit that produces a Bum digit that is also a BCD digit by adding two BCD digits simultaneously. 10 symbols make up BCD numerals (group of 4 bits 0000 to 1001). The following is what a BCD adder circuit must be able to achieve, and it is depicted in Fig.

3. If a 4-bit total is 9 or less, it is a valid BCD number and doesn’t require rectification.

4. The 4-bit total is an invalid BCD number if it exceeds 9 or if a carry is produced from it. The final step is to add the digit 6 (0110)2 to the total to create the correct BCD symbols.

Block diagram of a BCD adder