GATE 2007 ECE Video Solutions on Analog Circuits (Analog Electronics)

1. In a Transconductance amplifier, it is desirable to have
a. A large input resistance and a large output resistance
b. A large input resistance and a small output resistance
c. A small input resistance and a large output resistance
d. A small input resistance and a small output resistance

3. In the OP-AMP circuit shown, assume that the diode current follows the equation I = I_{S}exp(V/V_{T}). For V_{i} = 2 Volts, V_{o} = V_{01}, and for V_{i} = 4 Volts, V_{o} = V_{02}. The relationship between V_{01} and V_{02} is

a. V_{02} = √2 V_{01}
b. V_{02} = e^{2} V_{01}
c. V_{02} = V_{01} ln2
d. V_{02} - V_{01 }= V_{T} ln2

Statement for Linked Answer Questions
Consider the OP-AMP circuit shown in the figure.

4. The Transfer function V_{o}(s)/ V_{i}(s) is

Answer:A

5. If V_{i} = V_{1} sin(ωt) and V_{o} = V_{2} sin(ωt+ø), then the minimum and maximum values of ø (in radians) are respectively
a. – π/2 and π/2
b. 0 and π/2
c. – π and 0
d. – π/2 and 0