Operational Amplifier · Analog Circuits · GATE ECE

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Marks 1

GATE ECE 2022
An ideal OPAMP circuit with a sinusoidal input is shown in the figure. The 3 dB frequency is the frequency at which the magnitude of the voltage gain ...
GATE ECE 2022
A circuit with an ideal OPAMP is shown. The Bode plot for the magnitude (in dB) of the gain transfer function (Av(j$$\omega$$) = Vout(j$$\omega$$)/Vin...
GATE ECE 2017 Set 1
For the operational amplifier circuit shown, the output saturation voltages are $$ \pm \,\,15V$$. The upper and lower threshold voltages for the circu...
GATE ECE 2016 Set 1
Consider the constant current source shown in the figure below. Let $$\beta $$ represent the current gain of the transistor The load current I0 th...
GATE ECE 2016 Set 1
The following signal Vi of peak voltage 8V is applied to the non-inverting terminal of an ideal Opamp. The transistor has VBE = 0.7 V, $$\beta \, = \...
GATE ECE 2015 Set 2
In the circuit shown, VO = VOA for switch SW in position A and V0= VOB for SW in position B. Assume that the opamp is ideal. The value of $${{{V_{OB}...
GATE ECE 2015 Set 2
In the bistable circuit shown, the ideal opamp has saturation levels of $$ \pm 5V.$$ The value of R1 (in k$$\Omega $$ ) that gives a hystersis width...
GATE ECE 2015 Set 3
In the circuit shown using am ideal opamp, the 3-dB cut-off frequency (in Hz) is _____. ...
GATE ECE 2014 Set 4
The circuit shown represents ...
GATE ECE 2014 Set 2
In the differential amplifier shown in the figure, the magnitudes of the common-mode and differential-mode gains are 𝐴cm and 𝐴d, respectively. If t...
GATE ECE 2014 Set 1
In the low - pass filter shown in the figure, for a cut - off frequency of 5 KHz, the value of R2 (in k$$\Omega $$ ) is _________ ...
GATE ECE 2013
In the circuit shown below, what is the output voltage (vout ) if a silicon transistor Q and an ideal op-amp are used? ...
GATE ECE 2011
The circuit below implements a filter between the input current ii and the output voltage v0. Assume that the op-amp- is ideal, The filter implemented...
GATE ECE 2010
The transfer characteristic for the precision rectifier circuit shown below is (assume ideal OP-AMP and practical diodes) ...
GATE ECE 2010
Assuming the OP-AMP to be ideal, the voltage gain of the amplifier shown below is ...
GATE ECE 2005
The input resistance Ri of the amplifier shown in the figure is ...
GATE ECE 2004
An ideal Op-Amp is an ideal
GATE ECE 2004
The circuit in the figure is a ...
GATE ECE 2003
If the differential voltage gain and the common mode voltage gain of a differential Amplifier are 48 dB and 2 dB respectively, then it's common mode R...
GATE ECE 2001
The ideal Op-Amp has the following characteristics.
GATE ECE 2000
If the Op-Amp in the figure, is ideal, than V0 is ...
GATE ECE 2000
In the circuit of figure V0 is ...
GATE ECE 1999
The first dominant pole encountered in the frequency response of a compensated op-amp is approximately at
GATE ECE 1998
One input terminal of high gain comparator circuit is connected to ground and a sinusoidal voltage is applied to the other input. The output of compar...
GATE ECE 1998
In a differential Amplifier, CMRR can be improved by using an increased
GATE ECE 1997
An Amplifier a has 6 dB gain and 50 $$\Omega $$ input and output impedances. The noise figure of this Amplifier as shown in the figure is 3 dB. A cas...
GATE ECE 1996
The circuit shown in the figure is that of ...
GATE ECE 1995
In the given circuit if the voltage inputs V- and V+ are to be Amplified by the same Amplification factor, the value of 'R' should be ...
GATE ECE 1995
A change in the value of the Emitter resistance (Re in a difference Amplifier.
GATE ECE 1995
An op-Amp is used as a zero-crossing detector. If maximum output available from the Op-Amp is $$ \pm 12\,\,{V_{p - p}}$$ and the slew rate of the Op-...
GATE ECE 1994
The frequency compensation is used in OP-Amps to increase its___________

Marks 2

GATE ECE 2017 Set 1
The amplifier circuit shown in the figure is implemented using a compensated operational amplifier (op-amp), and has an open-loop voltage gain, A0 105...
GATE ECE 2017 Set 2
In the voltage reference circuit shown in the figure, the op-amp is ideal and the transistors Q1, Q2,….., Q32 are identical in all respects and have i...
GATE ECE 2016 Set 2
In the opamp circuit shown, the Zener diodes Z1 and Z2 clamp the output voltage Vo to +5 V or -5 V. The switch S is intially closed and is opened at...
GATE ECE 2016 Set 2
An opamp has a finite open loop voltage gain of 100. Its input offset voltage Vios (= +5mV) is modeled as shown in the circuit below. The amplifier i...
GATE ECE 2016 Set 3
For the circuit shown in the figure, R1 = R2 = R3 = 1 Ω, L = 1 µH and C = 1 µF. If the input Vin = cos(106t) , then the overall voltage gain (Vout /V...
GATE ECE 2016 Set 1
An ideal opamp has voltage source V1, V3, V5, ......, VN-1, connected to the non- inverting input and V2, V4, V6, .....VN connected to the inver...
GATE ECE 2016 Set 1
A p-i-n photo diode of responsivity 0.8A/W is connected to the inverting input of an ideal opamp as shown in the figure, +VCC = 15V, - VCC = -15V, L...
GATE ECE 2015 Set 2
For the voltage regulator circuit shown, the input voltage (Vin) is 20V $$ \pm $$ 20% and the regulated output voltage (Vout) is 10 V. Assume the opa...
GATE ECE 2015 Set 2
Assuming that the op-amp in the circuit shown below is ideal, the output voltage V0 (in volts) ...
GATE ECE 2015 Set 3
In the circuit shown, assume that the opamp is ideal. If the gain ($${V_0}/{V_{in}}$$) is -12, the value of R (in K$$\Omega $$) is _____. ...
GATE ECE 2015 Set 1
In the circuit shown, assume that the opamp is ideal. The bridge output voltage V0 (in mV) for $$\delta = 0.05$$ is______. ...
GATE ECE 2015 Set 1
The circuit shown in the figure has an ideal opamp. The oscillation frequency and the condition to sustain the oscillations, respectively, are ...
GATE ECE 2014 Set 3
Assuming that the Op-amp in the circuit shown is ideal, V0 is given by ...
GATE ECE 2014 Set 1
In the voltage regulator circuit shown in the figure, the op - amp is ideal. The BJT has VBE = 0.7 V and $$\beta $$ = 100, and the Zener voltage is 4....
GATE ECE 2014 Set 1
In the circuit shown, the op-amp has finite input impedance, infinite voltage gain and zero input offset voltage. The output voltage Vout is ...
GATE ECE 2013
In the circuit shown below the op-amps are ideal. Then Vout in Volts is ...
GATE ECE 2012
The circuit shown is a ...
GATE ECE 2008
Consider the following circuit using an ideal Op-Amp. The I-V characteristics of the diode is described by the relation $$$I = {I_0}\left[ {{e^{{V \o...
GATE ECE 2008
The Op-Amp circuit shown above represents a ...
GATE ECE 2008
Consider the Schmitt trigger circuit shown below. A triangular wave which goes from -12V to 12V is applied to the inverting input of the OP-AMP. Ass...
GATE ECE 2007
For the Op-Amp circuit shown in the figure, V0 is ...
GATE ECE 2007
In the Op-Amp circuit shown, assume that the diode current follows the equation I = Is exp (V/VT) . For Vi = 2V, Vo = V01, and for Vi = 4 V, Vo = V02...
GATE ECE 2007
Consider the OP-Amp circuit shown in the figure. The transfer function $${V_o}\left( s \right)/{V_i}\left( s \right)$$ is ...
GATE ECE 2007
Consider the OP-Amp circuit shown in the figure. If $${V_i} = {V_1}\,\,\sin \left( {\omega \tau + \phi } \right),$$ then the minimum and maximum val...
GATE ECE 2006
For the circuit shown in the following figure, the capacitor C is initially uncharged. At t = 0, the switch S is closed. The voltage VC across the ca...
GATE ECE 2005
In an ideal differential amplifier shown in the figure, a large value of (RE). ...
GATE ECE 2005
The voltage e0 indicated in the figure has been measured by an ideal voltmeter. Which of the following can be calculated? ...
GATE ECE 2005
The Op-Amp circuit shown in figure is a filter. The type of filter and its cut-off frequency are respectively. ...
GATE ECE 2005
Given the ideal operational amplifier circuit shown in figure, indicate the correct transfer characteristics assuming ideal diodes with zero cut-in vo...
GATE ECE 2004
In the op-amp circuit given in the figure, the load current iL is ...
GATE ECE 2003
If the Op-Amp in the figure is ideal, the output voltage Vout will equal to ...
GATE ECE 2003
If the input to the ideal comparator shown in figure is sinusoidal signal of 8V (peak to peak) without any DC component, then the output of the compar...
GATE ECE 2003
The output voltage of the Regulated power supply shown in the figure is ...
GATE ECE 2001
The Inverting Op-Amp shown in the figure, has an Open-loop gain of 100. The closed loop gain $${{{V_o}} \over {{V_s}}}$$ is ...
GATE ECE 2001
In the figure assume the Op-Amps to be ideal. The output V0 of the circuit is ...
GATE ECE 2001
An Amplifier using an Op-Amp with a Slew-Rate SR = V/$$\mu $$sec, has a gain of 40 dB. If this amplifier has to faith fully amplify sinsoidal signals...
GATE ECE 2000
If the Op-Amp in the figure has an input offset voltage of 5 mV and an open-loop voltage gain of 10,000, V0 will be ...
GATE ECE 1997
The output voltage V0 of the circuit shown in the figure is ...
GATE ECE 1993
For the ideal Op-Amp circuit of fig. Determine the output voltage V0 ...
GATE ECE 1992
Assume that the operational amplifier in figure is deal the current I through the IK ohm resistor is ...
GATE ECE 1992
The circuit of fig. uses an ideal OP_Amp for small positive values of Vin, the circuit works as ...
GATE ECE 1992
An Op-Amp has an offset voltage of 1mV and is ideal in all other respects. If this OP-Amp is used in the circuit shown in fig. The O/P voltage will be...
GATE ECE 1990
If the input to the circuit of figure is a sine wave the output will be. ...
GATE ECE 1990
The Op-Amp of fig has a very poor open loop voltage gain of 45 but is otherwise ideal. The gain of the Amplifier equals: ...
GATE ECE 1990
The CMRR of the differential Amplifier of the fig is equal to ...
GATE ECE 1989
Refer to Fig. ...
GATE ECE 1988
The OP-AMP shown in fig. below is ideal. $$R\, = \,\sqrt {L/C.} $$ The phase angle between V0 and Vi at $$\omega = 1/\sqrt {LC} $$ is ...
GATE ECE 1987
In Fig. if the CMRR of the operational amplifier is 60dB, then the magnitude of the output voltage is ...

Marks 5

GATE ECE 2001
Assume that the OP_AMP in the figure, ideal (a) Obtain an expression for V0 in terms of Vs, R, and the reverse saturation current Is of the transi...
GATE ECE 1997
Consider the circuit given in fig. using an ideal operational Amplifier. The characteristics of the diode are given by the relation I = Is $$\left[ ...
GATE ECE 1995
Shown that the system in Fig. is a double integrator. In other words, prove that the transfer gain is given by $${{{V_0}\left( s \right)} \over {{V_i}...
GATE ECE 1994
Find the output voltage of the following circuit assuming ideal op-amp behavior. ...
GATE ECE 1993
Find the output voltage, V0 in the following circuit assuming that the Op-Amps are ideal. ...
GATE ECE 1992
Consider the circuit shown in Fig. The circuit uses an ideal operational amplifier. Assuming that the impedances at noodes A and B do not load the pre...

Marks 8

GATE ECE 1988
The Op-Amp in the Fig below is ideal. Find the output when Vi = (1-exp($$ - \alpha t$$)) u(t). Assume the capacitor to be uncharged when the input is...
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