Analog Circuits Mock Test 9

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Question 1 of 10

1. If Channel Length modulation is neglected, what is the voltage gain from the source to the drain for the CG stage shown below?

g_m * R_d * {R_s / (R_s + 1/g_m)}

g_m * R_d * {R_s / (R_s + 2/g_m)}

g_m * R_d * {2R_s / (R_s + 1/g_m)}

g_m * R_d * {2R_s / (R_s - 1/g_m)}

Question 1 of 10

Question 2 of 10

2. If channel length modulation is present, what is the total impedance at node X?

R_d || r_o1 || 1/g_m2

R_d || r_o1 || 1/g_m2 || r_o2

R_d || 2r_o1 || 1/g_m2 || r_o2

R_d || r_o1 || 2/g_m2 || r_o2

Question 2 of 10

Question 3 of 10

3. What is the output frequency for the following circuit?

R4=30kΩ, R5=40kΩ, C1=5nF.

263 kHz

2.63 kHz

4.4 kHz

3kHz

Question 3 of 10

Question 4 of 10

4. Neglecting Channel Length Modulation, what is the voltage gain from the gate to the drain of M1?

3g_m * R₁

g_m * R₁ || R_O

g_m * R₁

g_m * 2R₁

Question 4 of 10

Question 5 of 10

5. If channel length modulation is present in M1 but not in M2, what is the voltage gain at node X?

1/g_m1 / (1/g_m2 + 1/g_m1)

(1/g_m2 || r_o2) / {1/g_m2 + ( 1/g_m1 || r_o1)}

1/g_m1 / {1/g_m2 + (1/g_m1 || r_o1)}

(1/g_m1 || r_o1) / (1/g_m2 + r_o1)

Question 5 of 10

Question 6 of 10

6. If g is the transconductance, r is the resistance due to channel length modulation and if M2 and M1 has channel length modulation but M3 doesn’t, what is the total resistance at the drain of M2?

{(1 + gr)* (R || 1/g || r) + (R || 1/g || r)} || R

{(1 + gr)* 3R + 2R} || R

Infinite

{(1 + gr)* R + R} || 2R

Question 6 of 10

Question 7 of 10

7. If g is the transconductance, r is the resistance due to channel length modulation and if M₂ and M₁ has channel length modulation but M₃ doesn’t, what is the output resistance at the source of M₃?

1/g || r + 1/g

1/g || r + 2/g

1/g || R + 1/g

1/g || R

Question 7 of 10

Question 8 of 10

8. What is the output voltage in the following C.S. stage?

0 V

5 V

2.5 V

3 V

Question 8 of 10

Question 9 of 10

9. Given that the feedback factor of an astable multivibrator is 0.3, find the frequency of the output.

20kHz

40Hz

22Hz

20Hz

Question 9 of 10

Question 10 of 10

10. If channel length modulation is neglected, what is the voltage gain for the following circuit?

– {g_m1 * R_d * R_d / (1/g_m2 + 2R_s)}

– {g_m1 * R_d * R_d / (1/g_m2 + R_s)}

– (g_m1 * 2R_d * R_d / R_s)

– {g_m1 * R_d * R_d / (1/g_m2 + R_s)}

Question 10 of 10