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# GATE EC 2022: Analog Circuits Quiz 9

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Question 1

Consider the following circuit as shown in figure below:

Assume op-amp to be ideal and knee voltage of diode = 0.7 V and neglect reverse saturation current of diode. Find the value of current I_{D} through diode such that op-amp operates in saturation region.

Question 2

Assume that the Op-amps are ideal then find V

_{o}as a function of V_{1}and V_{2}.

Question 3

The given circuitry produces triangular waveforms as output voltage. Calculate the value of V

_{ramp}if R1=R2=10kΩ and R3=20kΩ.Assume__+__V_{sat}=__+__12V. Also calculate the peak to peak amplitude of the triangular waveforms. (2 marks)Question 4

The approximate transfer characteristic for the circuit shown below with an ideal operational amplifier and diode will be

Question 5

The op-amp shown in the figure has a finite gain A = 1000 and an infinite input resistance. A step voltage V

_{i}= 1 mV is applied at the time t = 0 as shown. Assuming that the operational amplifier is not saturated, the time constant (in millisecond) of the output voltage V_{0}isQuestion 6

Consider the circuit shown in the figure. In this circuit R = 1 kΩ and C = 1 μF. The input voltage is sinusoidal with a frequency of 50 Hz, represented as a phasor with magnitude V

_{i}and phase angle 0 radian as shown in the figure. The output voltage is represented as a phasor with magnitude V_{0}and phase angle δ radian. What is the value of the output phase angle δ (in radian) relative to the phase angle of the input voltage?- 131 attempts
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Aug 9ESE & GATE EC

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