STUPIDSID
1 (a)
Write a note on evolution of IC era.
4 M
1 (b)
Explain the basic DC equation used in different regions of operation of MOS device. Identify these regions on V-I characteristics.
7 M
1 (c)
Explain with necessary circuit diagram and expressions, the body effect and how it affects the threshold voltage.
4 M
1 (d)
Find the value of body effect parameter (?) and the threshold voltage Vth, when the applied substrate bias is 3V. Given Vtho=0.4 V, NA=1016/cm3. Thermal equivalent voltage=26mV, ni=1.5×1010/cm3, tox=40 nm, &epsilon0 =8.85× 10-14 F/cm, &epsilonr(si)=11.9, &epsilonr(ox)=3.9, q=1.6×10-19C.
5 M
2 (a)
Draw the circuit diagram of a 2 i/p CMOS NAND gate along with stick diagram. Explain also the working of the circuit.
8 M
2 (b)
Explain how layout optimization can be used for increase in speed with an AND gate circuit and sticks diagrams.
12 M
3 (a)
Discuss the working, merits and demerits of the logic structures with two I/P NAND gate realization as an example.
i) Pseudo NMOS logic
ii) Complementary CMOS logic.
i) Pseudo NMOS logic
ii) Complementary CMOS logic.
10 M
3 (b)
Explain CMOS domino logic with the basic gate derive the evaluation voltage equation. What are the advantages of this logic?
10 M
4 (a)
What is sheet resistance? Explain the steps involved in calculating the sheet resistance of i) transistor channel, ii) nMOS inverter, iii) CMOS inverter
9 M
4 (b)
A particular layer of MOS circuit has a resistivity of 10 ohm-cm. A section of this layer is 55 μm long and 5 μm wide and has a thickness of 1 μm. Calculate the resistance from one end of this section to the other end. What is the value of Rs.?
5 M
4 (c)
What is the drawback of conventional inverter? How it is overcome using super buffer? Explain the working of inverting and non-inverting super buffer with necessary diagrams.
6 M
5 (a)
Explain the working of switch logic, pass transistor and transmission gates with their merits and demerits.
8 M
5 (b)
Explain the structural design concept using bus arbitration logic as an example.
12 M
6 (a)
What are the general considerations to be followed in designing a sub system?
8 M
6 (b)
What are the basic requirement of a shifter? Explain with an example of 4×4 crossbar switch. What are the drawbacks of this basic switch and how it is overcome?
12 M
7 (a)
Explain the working of three transistor dynamics RAM cell with circuit and stick diagrams.
10 M
7 (b)
Mention and explain various VLSI design tools used. Also explain different levels at simulation of VLSI design.
10 M
8 (a)
I/O pads
5 M
8 (b)
Real estate in VLSI
5 M
8 (c)
Silicide
5 M
8 (d)
Clocked circuits
5 M
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