**[Total Time: 3 Hours]**

**[Total Marks: 80 Marks]**

**N.B.: 1) Q.1 is compulsory**

** 2) Attempt any three questions out of the remaining five**

** 3) Assume suitable data if required.**

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Q. 1) Solve any four out of five: **(20M)**

(a) Why biasing is necessary in BJT amplifier?

b) Solve (35)_{10}-(47)_{10} using two’s compliment method.

c) Define :

1) truth table

2) standard SOP

3) De-Morgan’s theorem

4) Duality theorem

5) universal gate

d) Define multiplexer and state its application.

e) Convert S-R flip-flop to T flip-flop.

Q. 2) a) Using Quine-Me-dusky method determine minimum SOP form for *f*(A, B, C, D)=∑m(0,1,3,7,8,9,11,15). **(10M)**

b) What do you mean by differential amplifier? What is its primary function? State different configuration of it, which one is popularly used. **(10M)**

Q. 3) Draw & explain Ring counter using suitable waveforms. **(10M)**

b)Implement the following using only one 4:1 MUX and few gates: **(10M)**

*f*(A, B, C, D)=∑m(0,1,3,4,5,7,9,10,12,15)

Q. 4) a) Design MOD-9 Synchronous counter using J-K flip-flop.**(10M)**

b) Design four bit BCD adder using IC7483. **(10M)**

Q. 5) a) What is shift register? Mention different modes of operation of shift register?

b) State and explain various VHDL data objects in brief. **(10M)**

Q. 6) Solve the following (Any Four). **(20M)**

a) VHDL program format.

b) Difference between combinational circuit and sequential circuits.

c) Different biasing methods.

d) Race-around condition in flip-flop.

e) Current mirror circuit.

f) Arithmetic logic unit.

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