GATE ECE branch:ec PYQs & Answers — Page 67

Questions 661–670 of 715. Imported answers require independent review unless marked reviewed.

Two

-channel MOSFETs, T1 and T2, are identical in all respects except that the width of T2 is double that of T1. Both the transistors are biased in the saturation region of operation, but the gate overdrive voltage (

) of T2 is double that of T1, where

and

are the gate-to-source voltage and threshold voltage of the transistors, respectively. If the drain current and transconductance of T1 are

and

, respectively, the corresponding values of these two parameters for T2 are

Your answerChoose one option.

and

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In the figure shown, the

transistor acts as a switch.

Diagram for Electronics and Communication Engineering question 39

For the input

as shown in the figure, the transistor switches between the cut-off and saturation regions of operation, when T is large. Assume collector-to-emitter voltage at saturation

and base-to-emitter voltage

. The minimum value of the common-base current gain (

) of the transistor for the switching should be ________.

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An abrupt

junction (located at

) is uniformly doped on both

and

sides. The width of the depletion region is

and the electric field variation in the

-direction is

. Which of the following figures represents the electric field profile near the

junction?

Your answerChoose one option.

Diagram for Electronics and Communication Engineering question 39 (figure 2)

Diagram for Electronics and Communication Engineering question 39 (figure 3)

Diagram for Electronics and Communication Engineering question 39 (figure 4)

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For the circuit shown, assume that the NMOS transistor is in saturation. Its threshold voltage

and its transconductance parameter

. Neglect channel length modulation and body bias effects. Under these conditions, the drain current

in mA is ____________.

Diagram for Electronics and Communication Engineering question 40

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Assuming that transistors M1 and M2 are identical and have a threshold voltage of 1 V, the state of transistors M1 and M2 are respectively

Your answerChoose one option.

Saturation, Saturation

Linear, Linear

Linear, Saturation

Saturation, Linear

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For the DC analysis of the Common-Emitter amplifier shown, neglect the base current and assume that the emitter and collector currents are equal. Given that

, and the BJT output resistance

is practically infinite. Under these conditions, the midband voltage gain magnitude,

, is ____________.

Diagram for Electronics and Communication Engineering question 41

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In the circuit shown, transistors Q1 and Q2 are biased at a collector current of 2.6 mA. Assuming that transistor current gains are sufficiently large to assume collector current equal to emitter current and thermal voltage of 26 mV, the magnitude of voltage gain

in the mid-band frequency range is ______ (up to second decimal place).

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The amplifier circuit shown in the figure is implemented using a compensated operational amplifier (op-amp), and has an open-loop voltage gain,

and an open-loop cut-off frequency,

. The voltage gain of the amplifier at 15 kHz, in V/V, is ____________.

Diagram for Electronics and Communication Engineering question 42

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In the voltage reference circuit shown in the figure, the op-amp is ideal and the transistors Q₁, Q₂, ..., Q₃ are identical in all respects and have infinitely large values of common-emitter current gain (β). The collector current (

) of the transistors is related to their base-emitter voltage (

) by the relation

, where

is the saturation current. Assume that the voltage

shown in the figure is 0.7 V and the thermal voltage

The output voltage

(in volts) is ______

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Which one of the following gives the simplified sum of products expression for the Boolean function

, where

and

are minterms corresponding to the inputs

and

with

as the MSB and

as the LSB?

Your answerChoose one option.

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GATE ECE branch:ec PYQs

Question 38

Question 39

Question 39

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Question 41

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Question 42

Question 43