GATE ECE
Analog Circuits
Operational Amplifier
Previous Years Questions

## Marks 1

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 ...
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...
For the operational amplifier circuit shown, the output saturation voltages are $$\pm \,\,15V$$. The upper and lower threshold voltages for the circu...
Consider the constant current source shown in the figure below. Let $$\beta$$ represent the current gain of the transistor The load current I0 th...
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, $$\beta \, = \... In the circuit shown, VO = VOA for switch SW in position A and V0= VOB for SW in position B. Assume that the opamp is ideal. The value of$${{{V_{OB}...
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...
In the circuit shown using am ideal opamp, the 3-dB cut-off frequency (in Hz) is _____. ...
The circuit shown represents ...
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...
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 _________ ...
In the circuit shown below, what is the output voltage (vout ) if a silicon transistor Q and an ideal op-amp are used? ...
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...
The transfer characteristic for the precision rectifier circuit shown below is (assume ideal OP-AMP and practical diodes) ...
Assuming the OP-AMP to be ideal, the voltage gain of the amplifier shown below is ...
The input resistance Ri of the amplifier shown in the figure is ...
The circuit in the figure is a ...
An ideal Op-Amp is an ideal
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...
The ideal Op-Amp has the following characteristics.
In the circuit of figure V0 is ...
If the Op-Amp in the figure, is ideal, than V0 is ...
The first dominant pole encountered in the frequency response of a compensated op-amp is approximately at
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...
In a differential Amplifier, CMRR can be improved by using an increased
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...
The circuit shown in the figure is that of ...
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 ...
A change in the value of the Emitter resistance (Re in a difference Amplifier.
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-...
The frequency compensation is used in OP-Amps to increase its___________

## Marks 2

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...
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...
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...
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...
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...
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...
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...
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...
Assuming that the op-amp in the circuit shown below is ideal, the output voltage V0 (in volts) ...
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 _____. ...
In the circuit shown, assume that the opamp is ideal. The bridge output voltage V0 (in mV) for $$\delta = 0.05$$ is______. ...
The circuit shown in the figure has an ideal opamp. The oscillation frequency and the condition to sustain the oscillations, respectively, are ...
Assuming that the Op-amp in the circuit shown is ideal, V0 is given by ...
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....
In the circuit shown, the op-amp has finite input impedance, infinite voltage gain and zero input offset voltage. The output voltage Vout is ...
In the circuit shown below the op-amps are ideal. Then Vout in Volts is ...
The circuit shown is a ...
Shown that the system in Fig. is a double integrator. In other words, prove that the transfer gain is given by $${{{V_0}\left( s \right)} \over {{V_i}... Find the output voltage of the following circuit assuming ideal op-amp behavior. ... Find the output voltage, V0 in the following circuit assuming that the Op-Amps are ideal. ... Consider the circuit shown in Fig. The circuit uses an ideal operational amplifier. Assuming that the impedances at noodes A and B do not load the pre... ## Marks 8 The Op-Amp in the Fig below is ideal. Find the output when Vi = (1-exp($$ - \alpha t)) u(t). Assume the capacitor to be uncharged when the input is...
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