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QUESTION: 1

If a MOSFET is to be used in the making of an amplifier then it must work in

Solution:

Only in the saturation region a MOSFET can operate as an amplifier.

QUESTION: 2

For MOSFET is to be used as a switch then it must operate in

Solution:

In both regions it can perform the task of a switch.

QUESTION: 3

(Q.3 & Q.4) Using the circuit shown below,

**Q. Determine the conditions in which the MOSFET is operating in the triode region.**

i. V_{GD} > V_{t} (Threshold voltage)

ii. V_{D}S > V_{OV}

iii. I_{D} ∝ (V_{OV} – 0.5V_{DS})V_{DS}

Solution:

Only the points I and iii are correct and ii is false.

QUESTION: 4

Determine the conditions in which the MOSFET is operating in the saturation region

i. V_{GD} > V_{t} (Threshold voltage)

ii. V_{DS} > V_{OV}

iii. I_{D} ∝ (V_{OV})^{2}

Solution:

i is false and ii and iii are true.

QUESTION: 5

In the saturation region of the MOSFET the saturation current is

Solution:

Saturation current does not depends on the voltage difference between the source and the drain in the saturation region of a MOSFET.

QUESTION: 6

An n-channel MOSFET operating with V_{OV}=0.5V exhibits a linear resistance = 1 kΩ when V_{DS} is very small. What is the value of the device transconductance parameter k_{n}?

Solution:

Use the standard mathematical expression to determine the value of k_{n}.

QUESTION: 7

An NMOS transistor is operating at the edge of saturation with an overdrive voltage V_{OV} and a drain current I_{D}. If is V_{OV} is doubled, and we must maintain operation at the edge of saturation, what value of drain current results?

Solution:

I_{0} is directly proportional to V_{OS}.

QUESTION: 8

(Q.8-Q.10) Using the circuit below answer the question

**Q. Which of the following is true for the triode region?**

Solution:

V_{DG} > |V_{tp}| and V_{SD} < |V_{OV}|.

QUESTION: 9

Which of the following is true for the saturation region?

Solution:

It is a characteristic for the saturation region.

QUESTION: 10

The current i_{D}

Solution:

Use the standard mathematical expressions for i_{0} in different regions.

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