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Analog Electronics
MOSFET

Practice questions from MOSFET.

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Q#1 MOSFET GATE EE 2025 (Set 1) MCQ +1 mark -0.33 marks

Which one of the following statements is true about the small signal voltage gain of a MOSFET based single stage amplifier?

Common source and common gate amplifiers are both inverting amplifiers

Common source and common gate amplifiers are both non-inverting amplifiers

Common source amplifier is inverting and common gate amplifier is non-inverting amplifier

Common source amplifier is non-inverting and common gate amplifier is inverting amplifier

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Q#2 MOSFET GATE EE 2025 (Set 1) MCQ +2 marks -0.66 marks

In the circuit,  is an ideal current source. The transistors  and  are assumed to be biased in saturation, wherein  is the input signal and  is fixed DC voltage. Both transistors have a small signal resistance of  and trans-conductance of . The small signal output impedance of this circuit is

infinity

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Q#3 MOSFET GATE EE 2022 (Set 1) MCQ +1 mark -0.33 marks

For an ideal MOSFET biased in saturation, the magnitude of the small signal current gain for a common drain amplifier is 

0

1

100

infinite

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Q#4 MOSFET GATE EE 2020 (Set 1) MCQ +1 mark -0.33 marks

A common-source amplifier with a drain resistance, , is powered using a 10 V power supply. Assuming that the transconductance, gm is , the voltage gain of the amplifier is closest to:

1.22

–1.22

2.44

–2.44

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Q#5 MOSFET GATE EE 2020 (Set 1) NAT +1 mark -0 marks

The cross-section of a metal-oxide-semiconductor structure is shown schematically. Starting from an uncharged condition, a bias of +3 V is applied to the gate contact with respect to the body contact. The charge inside the silicon dioxide layer is then measured to be +Q. The total charge contained within the dashed box shown, upon

application of bias, expressed as a multiple of Q (absolute value in Coulombs, rounded off to the nearest integer) is ___________.

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Q#6 MOSFET GATE EE 2019 (Set 1) MCQ +1 mark -0.33 marks

Given  is the gate-source voltage,  is the drain source voltage, and  is the threshold voltage of an enhancement type NMOS transistor, the conditions for transistor to be biased in saturation are

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Q#7 MOSFET GATE EE 2019 (Set 1) MCQ +2 marks -0.66 marks

The enhancement type MOSFET in the circuit below operates according to the square law. , the threshold voltage  is 500 mV. Ignore channel length modulation. The output voltage  is

D:\Tiff\CH-6\(Q53 )EE 2019 (Naveen).png

500 mV

600 mV

2 V

100 mV

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Q#8 MOSFET GATE EE 2005 (Set 1) MCQ +1 mark -0.33 marks

Assume that the N-channel MOSFET shown in Figure is ideal, and that its threshold voltage is +1.0V. The voltage  between nodes a and b is:

5V

2V

1V

0V

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Q#9 MOSFET GATE EE 2005 (Set 1) MCQ +2 marks -0.66 marks

The charge distribution in a metal-dielectric-semiconductor specimen is shown in Figure.  The negative charge density decreases linearly in the semiconductor as shown. The electric field distribution is as shown in        

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Q#10 MOSFET GATE EE 2005 (Set 1) MCQ +2 marks -0.66 marks

Assume that the threshold voltage of the N-channel MOSFET shown in Figure is +0.75V. The output characteristics of the MOSFET are also shown.

The transconductance of the MOSFET is:        

0.75mS

1mS

2mS

10mS

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Q#11 MOSFET GATE EE 2005 (Set 1) MCQ +2 marks -0.66 marks

Assume that the threshold voltage of the N-channel MOSFET shown in Figure is +0.75V. The output characteristics of the MOSFET are also shown.

The voltage gain of the amplifier is:

+5

−7.5

+10

−10

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Q#12 MOSFET GATE EE 2004 (Set 1) MCQ +2 marks -0.66 marks

The value of R for which the PMOS transistor in figure will be biased in linear region is

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Q#13 MOSFET GATE EE 2003 (Set 1) MCQ +1 mark -0.33 marks

The variation of drain current with gate-to-source voltage ( characteristic) of a MOSFET is shown in Figure. The MOSFET is

An n-channel depletion mode device

An n-channel enhancement mode device

A p-channel depletion mode device

A p-channel enhancement mode device

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Q#14 MOSFET GATE EE 2003 (Set 1) MCQ +2 marks -0.66 marks

For the n-channel enhancement MOSFET shown in Figure, the threshold voltage . The drain current  of the MOSFET is 4 mA when the drain resistance  is . If the value of  is increased to , drain current  will become

2.8 mA

2.0 mA

1.4 mA

1.0 mA

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Q#15 MOSFET GATE EE 2001 (Set 1) MCQ +2 marks -0.66 marks

An n-channel JFET, having a pinch off voltage  of −5V, shows a trans-conductance  of 1mA/V when the applied gate-to-source voltage  is -3V.  Its maximum trans-conductance (in mA/V) is

1.5

2.0

2.5

3.0

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Q#16 MOSFET GATE EE 1999 (Set 1) MCQ +1 mark -0.33 marks

An enhancement type n-channel MOSFET is represented by the symbol

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