VLSI IMPORTANT QUESTIONS :

UNIT-1:

1)Explain the fabrication of NMOS,PMOS and CMOS fabrication Process?

2)Describe enhancement mode and depletion mode of transistor for NMOS?

3)Illustrate the relationship between Ids versus Vds of MOSFET?

4)Define threshold voltage of a MOS device and explain its significance?

5)Explain about the pull up and pull down ratio of an NMOS Inverter driven by another NMOS Inverter and NMOS Inverter driven by another NMOS Inverter separated by 2 or more Pass Transistors?

6)Explain NMOS Inverter with various Pull-Ups?

7)Explain about gm , gds , figure of merit wo?

8)Design CMOS and BI-CMOS inverters with their characteristics?

9)Explain about Alternative forms of pull-up?

10) Comparison between CMOS and Bi-COM technology?

11)Explain about Latch-up in CMOS circuits?

12)Derive the expression for transfer charecteristics of CMOS inverter?

13)Explain about the steps involved in VLSI design flow ?

Unit-II:

1)Explain about Sheet Resistance for NMOS and CMOS Inverters?

2)Explain about Area Capacitance of Layers?

3)Explain in detail about MOS Capacitances?

4)Explain about the Delay unit and derive the expression for Fall Time and Rise Time for CMOS inverter?

5)Explain different types of Capacitances and  explain how the Driving Large Capacitance Loads(Cascade Inverters as drivers, Super Buffers & CMOS Drivers)?

6)Explain about the Inverter Delays?

7)Explain about Routing Capacitances/Wiring Capacitances in detail?

8)What is Pass Transistor and explain pass transistor logic for 3 input AND gate?

9)what is Fan-in and Fan-out, Explain Choice of layers?

 

Unit-III:

1)Draw the stick diagrams for NMOS NAND,COMS NOR GATES ,?

2)Draw the stick diagram of PMOS NAND,NOR,AND,OR gates?

3)Explain various layout design rules?

4)Draw the layout diagram for CMOS inverter &  NAND ?

5)Draw the layout diagram for CMOS inverter?

7)Write scaling factors for different types of devices parameters?

8)Sketch the stick diagram for the NMOS implemented of the Boolean expression Y+AB+C.

9)Draw the symbolic layout for the CMOS inverter and give the general CMOS logic gate layout guidelines in detail.

Unit-4:      

1)Explain Different types of Alternate Logics(Pseudo NMOS, Dynamic, Domino ,Clocked CMOS)?

2)What is transmission Gate, Draw the Transmission gate diagram for 2 input MUX & 2 input XOR Logic?

3)Explain  about   Speed and Power Dissipation of Dynamic Logic?

4)Explain  the operation of 4*4 barrel shifter?

5)Explain the operation of 4-bit adder?

6)Design a PAL and PLA to realize a full Adder circuit?

7)What are the single bit adders and Explain about Carry Look ahead adders in detail?

8)What are synchronous and asynchronous Counters and Design a MOD-10 Counter using D-FlipFlop?

9)Explain about magnitude and equality Comparator?

The Remaining Questions will be uploaded soon.......👈👈👈👈👈👈