GATE 2011 ECE Video Solutions on Analog Circuits (Analog Electronics)

1. In the circuit shown below, capacitors C₁ and C₂ are very large and are shorts at the input frequency . v_i is a small signal input. The gain magnitude |V₀/V_i| at 10 M rad/sec is

a. Maximum
b. Minimum
c. Unity
d. Zero

Answer:A

Solution: https://www.youtube.com/watch?v=OL8a4oM3MhM


2. The circuit below implements a filter between the input current i_i and the output voltage v_o. Assume that the op-amp is ideal. The filter implemented is a

a. Low pass filter
b. Band pass filter
c. Band stop filter
d. High pass filter

Answer:D

Solution: https://www.youtube.com/watch?v=jH8CXKYc1No


Statement for linked answer Questions (3 and 4):
In the circuit shown below, assume that the voltage drop across a forward biased diode is 0.7 votls. The thermal voltage V_T = KT/q = 25 mV. The small signal input v_i = 100 cos(ωt) mV.

3. The bias current I_DC through the diodes is
a. 1 mA
b. 1.28 mA
c. 1.5 mA
d. 2 mA

Answer:A

4. The ac output voltage V_AC is
a. 0.25 cos(ωt) mV
b. 1 cos(ωt) mV
c. 2 cos(ωt) mV
d. 22 cos(ωt) mV

Answer: B

Solution: https://www.youtube.com/watch?v=s3I6VcArveo