GATE EE

Operational Amplifier

Analog Electronics

(Past Years Questions)

Marks 1

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The operational amplifier shown in the figure is ideal. The input voltage (in Volt) is $${V_i} = 2\sin \left( {2\pi \ti...
GATE EE 2015 Set 2
The filters $${F_1}$$ and $${F_2}$$ having characteristics as shown in figures $$(a)$$ and $$(b)$$ are connected as show...
GATE EE 2015 Set 2
Consider the circuit shown in the figure. In this circuit $$R = 1\,\,k\Omega ,$$ and $$C = 1\,\,\mu F.$$ The input volta...
GATE EE 2015 Set 1
Of the four characteristics given below, which are the major requirements for an instrumentation amplifier? P. $$\,\,\,\...
GATE EE 2015 Set 1
An operational-amplifier circuit is shown in the figure. The output of the circuit for a given input $${V_i}$$ is ...
GATE EE 2014 Set 3
In the circuit shown below what is the output voltage $$\left( {{V_{out}}} \right)$$ in Volts If a silicon transfer $$Q$...
GATE EE 2013
A low pass filter with a cut-off frequency of $$30Hz$$ is cascaded with a high pass filter with a cut off frequency of 2...
GATE EE 2011
For the circuit shown below, the correct transfer characteristics is ...
GATE EE 2011
Given that the op-amp is ideal, the $$O/P$$ voltage $${V_0}$$ is ...
GATE EE 2010
The nature of feedback in the op-amp circuit shown is ...
GATE EE 2009
The circuit shown in figure is ...
GATE EE 2007
For given sinusoidal input voltage, the voltage waveform at point $$P$$ of the clamper circuit shown in figure will be ...
GATE EE 2006
For the circuit shown in figure with an ideal operational amplifier, the maximum phase shift of the output $${V_o}$$ wit...
GATE EE 2003
The type of power amplifier which exhibits crossover distortion in its output is
GATE EE 2000
The circuit shown in figure uses an ideal op-amp working with $$+5V$$ and $$-5V$$ power supplies. The output voltage $${...
GATE EE 2000
The feedback factor for the circuit shown in fig. is ...
GATE EE 2000
A major advantage of active filters is that they can be realized without using
GATE EE 1997
The circuit shown in Figure, acts as a ... and for the given inputs, its output voltage is . . . . . $$V.$$ ...
GATE EE 1997
A non inverting op - amp amplifier is shown in figure. The o/p voltage is ...
GATE EE 1996
Let the magnitude of the gain in the inverting op - amp amplifier circuit shown be $$x$$ with switch $${S_1}$$ open. Whe...
GATE EE 1996
The common mode voltage of a unity gain (voltage follower) op-amp buffer in terms of its output voltage $${V_0}$$ is ___...
GATE EE 1995
Given figure, shows a non - inverting op - amp summer with $${V_1} = 2\,V$$ and $${V_2} = \, - 1V.$$ The output voltage ...
GATE EE 1994
An ideal op-amp is used to make an inverting amplifier. The two input terminals of the op-amp are at the same potential ...
GATE EE 1992

Marks 2

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For the circuit shown below, assume that the $$OPAMP$$ is ideal. Which one of the following is TRUE?...
GATE EE 2017 Set 2
The approximate transfer characteristic for the circuit shown below with an ideal operational amplifier and diode will b...
GATE EE 2017 Set 1
The saturation voltage of the ideal op-amp shown below is $$ \pm 10\,V.$$ The output voltage $${V_O}$$ of the following ...
GATE EE 2015 Set 2
The op-amp shown in the figure has a finite gain $$A = 1000$$ and an infinite input resistance. A step voltage $${V_i} ...
GATE EE 2015 Set 1
The transfer characteristic of the Op-amp circuit shown in figure is ...
GATE EE 2014 Set 3
A hysteresis type $$TTL$$ inverter is used to realize an oscillator in the circuit shown in the figure. If the lower a...
GATE EE 2014 Set 3
Given the Op-amps in the figure of ideal, the output voltage $${V_0}$$ is ...
GATE EE 2014 Set 1
In the figure shown, assume the op-amp to be ideal. Which of the alternatives gives the correct Bode plots for the trans...
GATE EE 2014 Set 1
In the circuit shown below the op-amps are ideal. Then $${V_{out}}$$ in Volts is ...
GATE EE 2013
The following circuit has $$R = 10k\Omega ,\,C = 10\mu F.$$ The input voltage is a sinusoidal at $$50HZ$$ with an $$RMS$...
GATE EE 2009
An ideal op-amp circuit and its input waveform are shown in the figures. The $$o/p$$ wave form of this circuit will be ...
GATE EE 2009
The block diagram of two types of half wave rectifiers are shown in figure. The transfer characteristics of the rectifie...
GATE EE 2008
A general filter circuit is shown in figure If $${R_1} = {R_2} = {R_A}$$ and $${R_3} = {R_4} = {R_B},$$ the circuit ac...
GATE EE 2008
A general filter circuit is shown in figure The output of the filter in above is given to the circuit shown in figure...
GATE EE 2008
A waveform generator circuit using $$OPAMPs$$ is shown in the figure. It produces a triangular wave at point $$'P'$$ wit...
GATE EE 2008
The switch $$'S'$$ is the circuit of the figure is initially closed. It is opened at time $$t=0.$$ You may neglect the z...
GATE EE 2007
The input signal $${V_{in}}$$ shown in the figure is a $$1$$ $$kHz$$ square wave voltage that alternates between $$+7V$$...
GATE EE 2007
A relaxation oscillator is made using op-amp as shown in figure. The supply Voltage of the op-amp are $$ \pm 12$$ the vo...
GATE EE 2006
Consider the inverting amplifier, using an ideal operational amplifier shown in figure. The designer wishes to realize t...
GATE EE 2005
In the given figure, if the input is a sinusoidal signal, the output-will appear as shown ...
GATE EE 2005
The input resistance $${R_{IN}}\left( { = {V_x}/{I_x}} \right)$$ of the circuit in the figure is ...
GATE EE 2004
In the Schmitt trigger circuit shown in figure, if $${V_{CE}}\left( {sat} \right) = 0.1V,$$ the output logic low level $...
GATE EE 2004
In the active filter circuit shown in figure, if $$Q=1,$$ a pair of poles will be realized with $${\omega _0}$$ equal t...
GATE EE 2004
Assuming the operational amplifier to be ideal, the gain $${V_{out}}/{V_{in}}$$ for the circuit shown in figure ...
GATE EE 2003
The output voltage$$\left( {{V_0}} \right)$$ of the Schmitt trigger shown in figure swings between $$+15V$$ and $$–15V.$...
GATE EE 2002
For the oscillator circuit shown in figure, the expression for the time period of oscillations can be given by (where $$...
GATE EE 2001
An op-amp, having a slew rate of $$62.8$$ $$V/\mu \,$$sec, is connected in a voltage follower configuration. If the maxi...
GATE EE 2001
An active filter consisting of an op-amp, resistor $${R_1},\,\,{R_2},\,\,{R_3}$$ and two capacitors of value $$C$$ each,...
GATE EE 2000
Match the following: List - $${\rm I}$$ (Circuit) List - $${\rm II}$$ (Functions) $$(P)$$$$\,\,\,\,\,$$ High-pass fi...
GATE EE 1998
For the differential amplifier circuit shown in Figure, determine the differential gain, the common-mode gain and the co...
GATE EE 1997
The Circuit shown in figure is excited by the input wave form shown. Sketch the wave form of the output. Assume all the ...
GATE EE 1992
In the following circuit the output $$'V'$$ follows an equation of the form $${{{d^2}V} \over {d{t^2}}} + a.{{dV} \over...
GATE EE 1992
With the ideal operational amplifiers, the circuit in figure simulates the equation ...
GATE EE 1991

Marks 5

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For the op-amp circuit shown in figure. Determine the output voltage $${v_0}.$$ Assume that the op-amps are ideal ...
GATE EE 2001
A simple active filter is shown in figure. Assume ideal op-amp. Derive the transfer function $${v_0}/{v_i}$$ of the circ...
GATE EE 2001
The input voltage $${V_i}$$ in the circuit is a $$1$$ $$kHz$$ sine wave of $$1$$ $$V$$ amplitude. Assume ideal operation...
GATE EE 1999
In the circuit of figure $${R_s} = 2\,k\Omega ,$$ $${R_L} = 5\,k\Omega $$ For the op-amp $$A = {10^5},$$ $${R_i} = 100\,...
GATE EE 1998
Figure below shows an op-amp amplifier. Find the output voltage in steady state condition where $$(i)$$ switch is open $...
GATE EE 1994
$$(a)$$ For the circuit shown in figure $$(i)$$ Calculate the transfer function $${{{V_0}} \over {{V_i}}}$$ $$(ii)$$ ...
GATE EE 1992
In the figure shown, assume that the zener diode and operational amplifier to be ideal. $$(a)$$ Draw the equivalent circ...
GATE EE 1991

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