Digital Electronics May 2009

1.(a) Realise EX-OR Gate with the help of 4 NAND gates only .
(b) Explain error detection and connection code .

2 .(a) Use Quine Mcluskey Method to solve the function and implement the function using NAND gates only .
f(A,B,C,D,E) = E (1,4,9,11,15,19,21,24,26,31)
(b) Design using NOR gates only
Y = (A + BC )(AB + BCD + CD )

3.a) Differentiate between Multiplexer and Encoder .
b) Draw and explain the circuit diagram of BCD Adder .

4 a) Explain the Bi-directional shift register .
b) Explain the steps involved in designing of synchronous counters .

5 . Write short notes on :
a) TTL Nand gate .
b) CMOS driving TTL and vice versa .

6 . a) Draw and explain the sample and hold circuit .

b) What are the specifications of A/D converters ? Explain the working of SAR .

7.Write the short notes on :
a) PAL
b) FPGA

8.What is tri state logic ?Where it is used ?
b) What are the requirements of Master slave flip flops ? How it is deisnged with the help if 2 JK flip flops .