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

1. In the circuit shown below, capacitors C_{1} and C_{2} are very large and are shorts at the input frequency . v_{i} is a small signal input. The gain magnitude |V_{0}/V_{i}| at 10 M rad/sec is

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

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