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Worksheets

DVD (18EC54) 2022-23

Total questions: 25

Worksheet time: 13mins

Name
Class
Date
1.

_______ is the photoresist which is initially soluble and becomes insoluble when exposed to UV light

a)

Positive photo resist

b)

Negative photo resist

c)

chrome

d)

reticle

2.

In fabrication ___________is the process of building wires to connect the devices.

a)

Sputtering

b)

Routing

c)

Passivation

d)

Metallization

3.

Which factor/s play/s a crucial role in determining the speed of CMOS logic gate?

a)

All of the above

b)

Load capacitance

c)

Supply voltage

d)

Gain factor of MOS

4.

For a static CMOS, the output is high, then the state of the NMOS and PMOS are as follows

a)

NMOS off and PMOS linear

b)

NMOS off and PMOS non-linear

c)

NMOS on and PMOS non-linear

d)

NMOS on and PMOS linear

5.

In high noise margin (NMH), the difference in magnitude between the maximum HIGH output voltage of driving gate and the maximum HIGH voltage is recognized by the _________gate.

a)

Driven

b)

Receiving

c)

Both a and b

d)

None of the above

6.

In CMOS circuits, which type of power dissipation occurs due to switching of transient current and charging & discharging of load capacitance?

a)

Dynamic dissipation

b)

Static dissipation

c)

Static and Dynamic dissipation

d)

None

7.

In stick diagram, n and p transistors are separated by using ____________

a)

Diffusion

b)

Demarcation line

c)

N well

d)

PR boundary

8.

In CMOS inverter, the propagation delay of a gate is the/an _________ transition delay time for the signal during propagation from input to output especially when the signal changes its value.

a)

Highest

b)

Average

c)

Lowest

d)

None

9.

The static PD for CMOS logic is maximum when input is at

a)

VDD

b)

VDD/2

c)

VDD/4

d)

2VDD

10.

------------------- can pass a logic 1 perfectly, but cannot pass a logic 0 perfectly

a)

Transmission gate

b)

nMOS

c)

pMOS

d)

Keepers

11.

To ensure both read stability and writeability in SRAM; The nMOS pull down transistor must be sized _______ as compared to access transistors and pMOS transistor must be sized_______.

a)

Stronger ; Weaker

b)

Weaker; Stronger

c)

Greater; smaller

d)

Smaller; Greater

12.

For a 1T DRAM the voltage swing on the bitline during read out is ____

a)

No Leakage

b)

Leakage

c)

one

d)

zero

13.

Consider a memory is designed to store 512-bytes of data in a four-way fold. The number of address lines feed to a row decoder =_________ and column decoder =________ to access 8-bit data at a time.

a)

6;2

b)

7;3

c)

7; 2

d)

6;3

14.

If a designer wants to make nMOS 5X stronger than pMOS, then what sizes the designer end up having for Pseudo-nMOS inverter logic? Assume that the unit size inverter has .

a)

PMOS: 2/4 and NMOS: 7/4

b)

PMOS: 2/4 and NMOS: 6/4

c)

PMOS: 3/4 and NMOS: 5/4

d)

PMOS: 2/4 and NMOS: 5/4

15.

The setup time is defined w.r.t positive edge of clock for _____ level Latch and for _____ edge-triggered flip-flop

a)

- ; +

b)

+ ; -

c)

--; ++

d)

++; --

16.

To realize a negative-edge triggered flip-flop the master is built using _____ latch and the slave is built using _______ latch.

a)

-- ;++

b)

++; --

c)

+ ; -

d)

- ;+

17.

Determine the logic contamination delay in each clock cycle for 2 phase transparent latch with 10ps of non-overlapping between phases. Assume that the system is a causal system. The value of logic contamination delay is _______ps.

Given Clock skew 0ps; clock period 500ps;hold time 60ps; setup time 25ps; tCDQ 40ps; tCCQ 35ps; non-overlap 50ps

a)

16

b)

14

c)

17

d)

15

18.

A 5 input NOR gate has a logical effort of _____ and parasitic delay of

______. Assume that the unit size inverter has 2/1

a)

11/3 ; 14/3

b)

11/3 ; 16/3

c)

12/3 ; 15/3

d)

11/3 ; 15/3

19.

In a Hi-Skewed inverter, the value of βp is ________ βn.

a)

Lesser

b)

Equal

c)

Greater

d)

none

20.

Which mask is used for creating a body terminal of nMOS?

a)

nWell

b)

p+ diffusion

c)

n+ diffusion

d)

none

21.

Which among the sequential elements have postponded output.

a)

Latch

b)

Master slave latch

c)

Flip-flop

d)

none

22.
a)

Depletion MOSFET

b)

Enhancement MOSFET

c)

Depletion MOSFET and Enhancement MOSFET

d)

None of the above

23.
a)

constant electric scaling

b)

constant voltage scaling

c)

constant current model

d)

constant electric and voltage scaling

25.

When both nMOS and pMOS transistors of CMOS logic design are in OFF condition, the output is:

a)

1 or Vdd or HIGH state

b)

0 or ground or LOW state

c)

High impedance or floating(Z)

d)

None of the mentioned