• Posted by  FreshersWorld
7 Jan, 2012

It was one and hour paper. It has got three sections. Total Marks 60

1.Multiple Choices.

2.TRUE and False.

3.Descriptive

Following are section 1 and section2 questions.

1.How Jk F/F can be converted into T F/F.

2.Difference between display and write in Verilog.?

3.ASIC flow steps? (RTL design ->Functional Verification->Synthesis ->STA->Place and route)

4.Difference between Latch and F/F?Which is faster?

5.Difference/Comparison between DRAM and SRAM?

6.what happens to Vth if temp Increases>?

7.In a negative feedback control System ,If feed factor Increases what happens to Gain and Bandwidth?

8.NMOS  and PMOS will pass which value without degradation?[NMOS -0 and PMOS -1]

9.AB+B?C

(i).Cant be further reducible and glitch

(ii)Can reducible further and cant glitch

10.which is faster :read cache or write cache?

11.Noise Margin Definition?

12.What happens to power If Vth increases In CMOS?

13.enum = {a=1,b=5,c,d}

What is the c and d?

14(.A?+B?) is equivalent to?

15.How can we Increase the slope of Trasnfer chacteristics of a CMOS?

(i)Increasing W/L ratio of PMOS and NMOS In the same proportion

(ii) Increasing W/L ratio of PMOS and NMOS In different proportion

(iii) Increasing W/L ratio of PMOS only

(iv) Increasing W/L ratio of NMOS only

Descriptive Questions

1.What happens If we interchange PMOS and NMOS in a CMOS Inverter?

2.Why PMOS width should be greater than NMOS?

3.int a =0;

If(a++) print (?Example1?);

else if (++a) print (?example2);

(i)What is the output if the program?

(ii)What is the value of i?

5.Draw the output waveform?

(i) initial begin

Y = #5 0;

Y = #3 1;

Y = # 8 0;

(ii)       Y <= #5 0;

Y <= #3 1;

Y <= # 8 0;

6.Write a Verilog code for async RESET and sync SET  F/F?

7.Design NAND gate using 2:1 MUX?

8.Design 4 input NAND gate using 2 Input NAND gate?

9.Design 3 input AND gate using 4:1 MUX?

10.CMOS schematic for (AB+C(A+B))?

11.Different Types of power dissipation in CMOS?

12.Moore overlapping sequence for 1101.

13.Difference between MELAY and MOORE?

14.Design a latch using MUX?

15.Characterstic Equations for SR, JK,T,D F/F.