GATE EE
Analog Electronics
Operational Amplifier
Previous Years Questions

Marks 1

The steady state output (Vout), of the circuit shown below, will ...
The output impedance of a non-ideal operational amplifier is denoted by Zout. The variation in the magnitude of Zout with increasing frequency, f, in ...
The current gain (Iout/Iin) in the circuit with an ideal current amplifier given below is ...
Consider the circuit shown in the figure. In this circuit $$R = 1\,\,k\Omega ,$$ and $$C = 1\,\,\mu F.$$ The input voltage is sinusoidal with a freque...
Of the four characteristics given below, which are the major requirements for an instrumentation amplifier? P. $$\,\,\,\,$$High common mode rejection ...
The operational amplifier shown in the figure is ideal. The input voltage (in Volt) is $${V_i} = 2\sin \left( {2\pi \times 2000t} \right).$$ The ampl...
The filters $${F_1}$$ and $${F_2}$$ having characteristics as shown in figures $$(a)$$ and $$(b)$$ are connected as shown in Figure $$(c).$$ The cut...
An operational-amplifier circuit is shown in the figure. The output of the circuit for a given input $${V_i}$$ is ...
In the circuit shown below what is the output voltage $$\left( {{V_{out}}} \right)$$ in Volts If a silicon transfer $$Q$$ and an ideal op-amp are used...
A low pass filter with a cut-off frequency of $$30Hz$$ is cascaded with a high pass filter with a cut off frequency of 20Hz. The resultant system of f...
For the circuit shown below, the correct transfer characteristics is ...
Given that the op-amp is ideal, the $$O/P$$ voltage $${V_0}$$ is ...
The nature of feedback in the op-amp circuit shown is ...
The circuit shown in figure is ...
For given sinusoidal input voltage, the voltage waveform at point $$P$$ of the clamper circuit shown in figure will be ...
For the circuit shown in figure with an ideal operational amplifier, the maximum phase shift of the output $${V_o}$$ with reference to the input $${V_...
The type of power amplifier which exhibits crossover distortion in its output is
The circuit shown in figure uses an ideal op-amp working with $$+5V$$ and $$-5V$$ power supplies. The output voltage $${V_0}$$ is equal to ...
The feedback factor for the circuit shown in fig. is ...
A major advantage of active filters is that they can be realized without using
The circuit shown in Figure, acts as a ... and for the given inputs, its output voltage is . . . . . $$V.$$ ...
A non inverting op - amp amplifier is shown in figure. The o/p voltage is ...
Let the magnitude of the gain in the inverting op - amp amplifier circuit shown be $$x$$ with switch $${S_1}$$ open. When the switch $${S_1}$$ is clos...
The common mode voltage of a unity gain (voltage follower) op-amp buffer in terms of its output voltage $${V_0}$$ is __________.
Given figure, shows a non - inverting op - amp summer with $${V_1} = 2\,V$$ and $${V_2} = \, - 1V.$$ The output voltage $${V_0} = \_\_\_\_\_$$ ...
An ideal op-amp is used to make an inverting amplifier. The two input terminals of the op-amp are at the same potential because

Marks 2

The approximate transfer characteristic for the circuit shown below with an ideal operational amplifier and diode will be ...
For the circuit shown below, assume that the $$OPAMP$$ is ideal. Which one of the following is TRUE?...
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 ...
The saturation voltage of the ideal op-amp shown below is $$ \pm 10\,V.$$ The output voltage $${V_O}$$ of the following circuit in the steady-state is...
Given the Op-amps in the figure of ideal, the output voltage $${V_0}$$ is ...
In the figure shown, assume the op-amp to be ideal. Which of the alternatives gives the correct Bode plots for the transfer function $${{{V_O}\left( ...
A hysteresis type $$TTL$$ inverter is used to realize an oscillator in the circuit shown in the figure. If the lower and upper trigger level voltage...
The transfer characteristic of the Op-amp circuit shown in figure is ...
In the circuit shown below the op-amps are ideal. Then $${V_{out}}$$ in Volts is ...
The following circuit has $$R = 10k\Omega ,\,C = 10\mu F.$$ The input voltage is a sinusoidal at $$50HZ$$ with an $$RMS$$ values of $$10V.$$ Under ide...
An ideal op-amp circuit and its input waveform are shown in the figures. The $$o/p$$ wave form of this circuit will be ...
The block diagram of two types of half wave rectifiers are shown in figure. The transfer characteristics of the rectifiers are also shown within the b...
A general filter circuit is shown in figure If $${R_1} = {R_2} = {R_A}$$ and $${R_3} = {R_4} = {R_B},$$ the circuit acts as a ...
A general filter circuit is shown in figure The output of the filter in above is given to the circuit shown in figure The gain $${V_S}$$ frequency ...
A waveform generator circuit using $$OPAMPs$$ is shown in the figure. It produces a triangular wave at point $$'P'$$ with a peak to peak voltage of $$...
The switch $$'S'$$ is the circuit of the figure is initially closed. It is opened at time $$t=0.$$ You may neglect the zener diode forward voltage dro...
The input signal $${V_{in}}$$ shown in the figure is a $$1$$ $$kHz$$ square wave voltage that alternates between $$+7V$$ and $$-7V$$ with a $$50\% $$ ...
A relaxation oscillator is made using op-amp as shown in figure. The supply Voltage of the op-amp are $$ \pm 12$$ the voltage waveform at point $$'p'$...
Consider the inverting amplifier, using an ideal operational amplifier shown in figure. The designer wishes to realize the input resistance seen by th...
In the given figure, if the input is a sinusoidal signal, the output-will appear as shown ...
In the Schmitt trigger circuit shown in figure, if $${V_{CE}}\left( {sat} \right) = 0.1V,$$ the output logic low level $$\left( {{V_{OL}}} \right)$$ i...
The input resistance $${R_{IN}}\left( { = {V_x}/{I_x}} \right)$$ of the circuit in the figure is ...
In the active filter circuit shown in figure, if $$Q=1,$$ a pair of poles will be realized with $${\omega _0}$$ equal to ...
Assuming the operational amplifier to be ideal, the gain $${V_{out}}/{V_{in}}$$ for the circuit shown in figure ...
The output voltage$$\left( {{V_0}} \right)$$ of the Schmitt trigger shown in figure swings between $$+15V$$ and $$–15V.$$ Assume that the operational ...
An op-amp, having a slew rate of $$62.8$$ $$V/\mu \,$$sec, is connected in a voltage follower configuration. If the maximum amplitude of the input sin...
For the oscillator circuit shown in figure, the expression for the time period of oscillations can be given by (where $$\tau = RC$$ ) ...
An active filter consisting of an op-amp, resistor $${R_1},\,\,{R_2},\,\,{R_3}$$ and two capacitors of value $$C$$ each, has a transfer function $$T\...
Match the following: List - $${\rm I}$$ (Circuit) List - $${\rm II}$$ (Functions) $$(P)$$$$\,\,\,\,\,$$ High-pass filter $$(Q)$$$$\,\,\,\,\,$$ Amp...
For the differential amplifier circuit shown in Figure, determine the differential gain, the common-mode gain and the common mode rejection ratio. ...
The Circuit shown in figure is excited by the input wave form shown. Sketch the wave form of the output. Assume all the components are ideal ...
In the following circuit the output $$'V'$$ follows an equation of the form $${{{d^2}V} \over {d{t^2}}} + a.{{dV} \over {dt}} + bV = f\left( t \right...
With the ideal operational amplifiers, the circuit in figure simulates the equation ...

Marks 5

For the op-amp circuit shown in figure. Determine the output voltage $${v_0}.$$ Assume that the op-amps are ideal ...
A simple active filter is shown in figure. Assume ideal op-amp. Derive the transfer function $${v_0}/{v_i}$$ of the circuit, and state the type of the...
The input voltage $${V_i}$$ in the circuit is a $$1$$ $$kHz$$ sine wave of $$1$$ $$V$$ amplitude. Assume ideal operational amplifiers with $$ \pm 15V\...
In the circuit of figure $${R_s} = 2\,k\Omega ,$$ $${R_L} = 5\,k\Omega $$ For the op-amp $$A = {10^5},$$ $${R_i} = 100\,k\Omega ,\,\,{R_0} = 50\,k\Ome...
Figure below shows an op-amp amplifier. Find the output voltage in steady state condition where $$(i)$$ switch is open $$(ii)$$ $$S$$ is closed ...
$$(a)$$ For the circuit shown in figure $$(i)$$ Calculate the transfer function $${{{V_0}} \over {{V_i}}}$$ $$(ii)$$ plot the amplitude and phase r...
In the figure shown, assume that the zener diode and operational amplifier to be ideal. $$(a)$$ Draw the equivalent circuit and evaluate the gain $$\l...
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