Consider the following two statements about the internal conditions in an n-channel MOSFET operating in the active region S1: The inversion charge decreases from source to drain S2: The channel potential increases from source to drain Which of the following is correct

1. Only S2 is true

2. Both S1 and S2 are false

3. Both S1 and S2 are true, but S2 is not a reason for S1

4. Both S1 and S2 are true, and S2 is a reason for S1

View Answer

Correct Answer :

Both S1 and S2 are true, and S2 is a reason for S1

Explanation :
No Explanation available for this question

For the circuit shown in the following figure, transistors M1 and M2 are identical NMOS transistors. Assume the M2 is in saturation and the output is unloaded The current Ix is related to Ibias as

1. Ix = Ibias + Is

2. Ix = Ibias

3. Ix = Ibias - Is

4. Ix = Ibias - (VDD - (Vout/RE))

View Answer

Correct Answer :

I_x = I_bias

Explanation :
No Explanation available for this question

In the following astable multivibrator circuit, which properties of V0(t) depend on R2

1. Only the frequency

2. Only the amplitude

3. Both the amplitude and the frequency

4. Neither the amplitude nor the frequency

View Answer

Correct Answer :

Only the frequency

Explanation :
No Explanation available for this question

In the circuit shown below, the op-amp is ideal, the transistor has VBE = 0.6V and β = 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of the op-amp

1. Positive feedback, V = 10 V

2. Positive feedback, V = 0 V

3. Negative feedback, V = 5 V

4. Negative feedback, V = 2 V

View Answer

Correct Answer :

Negative feedback, V = 2 V

Explanation :
No Explanation available for this question

The measured transconductance gm of an NMOS transistor operating in the linear region is plotted against the gate voltage VG at a constant drain voltage VD. Which of the following figures represents the expected dependence of gm on VG

View Answer

Correct Answer :

Explanation :
No Explanation available for this question

A small signal source Vi (t) = A cos 20t + B sin 106t is applied to a transistor amplifier as shown below. The transistor has β = 150 and h ie = 3k Ω. Which expression best approximates V0 (t)

1. V0 (t) = -1500 (A cos 20t + B sin 106t)

2. V0 (t) = -150 (A cos 20t + B sin 106t)

3. V0 (t) = -1500B sin 106t

4. V0 (t) = -150B sin 106t

View Answer

Correct Answer :

V₀(t) = -150B sin 10⁶t

Explanation :
No Explanation available for this question

If X = 1 in the logic equation

1. Y = Z

3. Z = 1

4. Z = 0

View Answer

Correct Answer :

Z = 0

Explanation :
No Explanation available for this question

Consider the following circuit using an ideal OPAMP. The I-V characteristics of the diode is described by the relation where VT = 25 mV, I0 = 1µA and V is the voltage across the diode (taken as positive for forward bias) For an input voltage VT = -I V, the output voltage V0 is

1. 0 V

2. 0.1 V

3. 0.7 V

4. 1.1 V

View Answer

Correct Answer :

0.1 V

Explanation :
No Explanation available for this question

The OPAMP circuit shown above represents a

1. high pass filter

2. low pass filter

3. band pass filter

4. band reject filter

View Answer

Correct Answer :

low pass filter

Explanation :
No Explanation available for this question

Two identical NMOS transistors M1 and M2 are connected as shown below. Vbias is chosen so that both transistors are in saturation. The equivalent gm of the pair is defined to be (∂Iout/(∂Vi) at constant Vout. The equivalent gm of the pair is

1. the sum of individual gm's of the transistors

2. the product of individual gm's of the transistors

3. nearly equal to the gm of M1

4. nearly equal to gm/go of M2

View Answer

Correct Answer :

nearly equal to the gm of M1

Explanation :
No Explanation available for this question

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