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GATE EC 2021: 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 ID through diode such that op-amp operates in saturation region.

Question 2

Assume that the Op-amps are ideal then find Vo as a function of V1 and V2.

Question 3

The given circuitry produces triangular waveforms as output voltage. Calculate the value of Vramp if R1=R2=10kΩ and R3=20kΩ.Assume +Vsat=+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 Vi = 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 V0 is

Question 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 Vi and phase angle 0 radian as shown in the figure. The output voltage is represented as a phasor with magnitude V0 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?

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