1.a)A typical pc used a 20 bit address code for its memory locations :
i)How many thse digits are needed to represent a memory address ?
ii)ii) What is the range of addresses ?
iii)What is the total no. Of memory locations ?
1 b) Define the positive and negative logic . What are the limitations of digital techniques .
c)Perform the following operations
i)Sub + 37 from – 95
ii)Add +9 to +6
2 . (a)Minimize the following expressions using k-map and realize with NOR gate only .
f(A,B,C,D) = pie M( 1,4,6,9,19,11,14,15)
b)Simplify :
3(a) Design combinational logic circuit for counting binary to gray .
b) What is a multiplexer tree . Why is it needed ?Draw the block diagram of 64 :1 multiplexer tree . How is input directed to the output in this system .

4 (a) Explain the operation of master slave J K flip flop and show that it has no race around condition .
4(b) Design MOD – 12 counter using D flip flop .

5(a) Explain the switching characteristic of p-n junction diode .

5 b) What do you mean by interfacing ?Explain the need . How will you interface TTL to CMOS .

6 a) Explain the following terms as applicable to ADC .
i)Resolution
ii)Quantization error .
iii)Conversion rate .

b) How many bits are required at the input of ladder D/A convertor , if it is required to give a resolution of 5mV and if the full scale output voltage is +5V . Find the % resolution .

7(a) In what respects in the architectural of PAL different from that of PROM . Explain with the use of suitable diagram .

b) Design the BCD to excess convertor using PLA .

8 (a) Write short notes on any two of the following :
a) Sample and Hold Circuit .
b)BCD Adder
c)Successive approximation A/D convertor .