BIT102 – Digital Electronics

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DRIVE fall 2017

PROGRAM Bachelor of Science in Information Technology - B.SC(IT)

SEMESTER I

SUBJECT CODE & NAME BIT102 – Digital Electronics

Assignment Set -1

1 Write a short note on J-K Master Slave Flip-Flop.

Answer: J-K Master Slave Flip Flop

The logic symbol for the master-slave flip-flop only indicates the initial inputs to the master and the outputs from the slave as indicated by the J-K

2 Explain the working of 4 bit Johnson counter with the help of neat diagram.

Answer: A Johnson counter is constructed using serial-in and serial-out (SISO) shift register. The output of the shift register is connected back to the input after passing it through an inverter. Depending on the initial bit pattern stored in the shift register, the shift register content changes for every clock and the bit pattern gets repeated after 2n clocks, where n is the number of bits in the shift register. These

3 Explain BCD adder and BCD subtractor.

Answer: BCD Adder

The addition in BCD can be performed in three steps: 1) Add the numbers in binary. 2) Check if the number is greater than 9. 3) Then convert the sum of two numbers to BCD number by adding correction value. The correction value will be equal to 6 if the sum output in step 1 is greater than 9, else the

Assignment Set -2

1 Convert the following hexadecimal numbers to base 10:

a. 145

b. A2C1

Answer: a. 14516 in Hexadecimal number system and we want to translate it into Decimal.

14516 = 1*16^2+4*

2 Construct XOR and NAND Gate using NOR Gate.

Answer: a)

3 Simplify f (a, b, c, d) = Σm(0, 2, 4, 6, 7, 8, 9, 11, 12, 14)

Answer: The given function is:

f(a.b.c.d)= ∑m(0,2,4, 6,7,8,9,11,12,14)

This is a four variable function so

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