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An operational amplifier, abbreviated as op-amp, is basically a multi-stage, very high gain, direct-coupled, negative feedback amplifier that uses voltage shunt feedback to provide a stabilized voltage gain. The curve drawn between output voltage and input differential voltage, for an op-amp, keeping voltage gain A constant is known as voltage transfer curve. When the difference of the two inputs applied to the two terminals of a differential amplifier is amplified, the resultant gain is termed as differential gain.

But when the two input terminals are connected to the same input source then the gain established by the differential amplifier is called the common mode gain. High CMRR ensures that the common mode signals such as noise are rejected successfully and the output voltage is proportional only to the differential input voltage.

GATE Most Expected Questions \u0026 Solution -4 Analog (Op-amp Part-1)

When an op-amp is operated in the open-loop configuration, the output either goes to positive saturation or negative saturation levels or switches between positive and negative saturation levels and thus clips the output above these levels. So open-loop op-amp configurations are not used in linear applications.

Input offset voltage may be defined as that voltage which is to be applied between the input terminals to balance the amplifier. Voltage follower is an electronic circuit in which output voltage tracts the input voltage both in sign and magnitude.

Voltage follower has three unique characteristics viz. In Explain what way is the voltage follower a special case of the non-inverting amplifier? Inverting amplifier is a very versatile component and can be used for performing number of mathematical stimulation such as analog inverter, paraphrase amplifier, phase shifter, adder, integrator, differentiator.

Differential amplifier is a combination of inverting and noninverting amplifiers and amplifies the voltage difference between input lines neither of which is grounded. Adder or summing amplifier is a circuit that provides an output voltage proportional to or equal to the algebraic sum of two or more input voltages multiplied by a constant gain factor.

Op-amp is used mostly as an integrator than a differentiator because in differentiator at high frequency, gain is high and so high-frequency noise is also amplified which absolutely abstract the differentiated signal. What is CMRR? What is Amplifier? In this condition it is known as perfect balance. It is called high gain differential circuit because the difference of the two input is amplified. It is called operational amplifier because it is used for performing different functions like differentiation, addition, integration, subtraction.

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It has infinite voltage gain, infinite slew rate, infinite input impedance, zero output impedance, infinite bandwidth. What is the output Differentiator and Integrator? If we give the sinusoidal input in differentiator we will get the output of differentiator as a square output.

If we give the sinusoidal input in integrator we will get the output of integrator as a ramp output. For the CMRR to be infinite what will be the condition? An ideal operational amplifier has A. All of the above Answer: C. Another name for a unity gain amplifier is: A. The open-loop voltage gain Aol of an op-amp is the A.

A series dissipative regulator is an example of a: A. A noninverting closed-loop op-amp circuit generally has a gain factor: A.These short solved questions or quizzes are provided by Gkseries. View Answer. Toggle navigation E-Books. Computer Sc. Home GK op amp multiple choice questions with answers. Go To Download Page Close. The Op-amp has an open-loop voltage gain ofIf an Op-amp with an open-loop voltage gain ofis substituted in the arrangement, the closed-loop gain …….

A doubles. B drops to C remains at D increases slightly. Answer: remains at C both a. D neither d. Answer: both a. A half of either collector current.

B equal to either collector current. C two times either collector current. D equal to the difference in base currents. Answer: two times either collector current. A the noninverting input. B the inverting input.Inverting amplifier and its controlled-source model. Draw the circuit diagram for inverting amplifier using Op-Amp [M] Darlington Transistor Pair. First, students will look at a detailed definition of op-amp circuits and a web-based circuit simulation. We present a study on students' misconceptions of basic op-amp circuits, based on answers to exam questions, after conventional teaching which was conducted at the School of Pedagogical and.

We have also provided number of questions asked since and average weightage for each subject. This site can provide you the latest GATE info only with the help from you. The values and initial conditions of L and C are the same as in statement. Op-Amps are popular for its versatility as they can be configured in many ways and can be used in different aspects.

The topics that are covered. Following are the questions that has been asked in the technical interviews as well as engineering exams. The input stage of an op amp is usually a a. In this configuration, an op-amp produces an output potential relative to circuit ground that is typically hundreds of thousands of times larger than the potential difference between its input terminals.

Greater than one C.

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Here's the schematic of the circuit, we're going to analyze. Letters and numbers preceding indicate the type of. I also added a bunch of very Op Amps from Japan with rather respectable specs. Question 2: Through my understanding, the current limiting circuit works by regulating the gate voltage of the mosfet by op amps. One Mark Questions Q11 - 35 Read the specs carefully.

First opamp act as non-inverting amplifier. The question paper is divided into three sections: General Aptitude, Engineering Mathematics, Subject-specific section. Magnetism and Electromagnetism. Expect to see the same topics: an op-amp analysis problem, op-amp design problem, gate delay timing diagram, digital logic implementation and basic simplification optimal simplification will not be requireddiode circuit operation.

This process is known as pole splitting. Draw the block diagram of an Operational Amplifier. Control by the Gate voltage is achieved by modulating the conductivity of the semiconductor region.

Give applications of it. The op-amp has a dominant-pole open-loop response.

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Preview of the attached file The circuit is named a "trigger" because the output retains its value until the input changes sufficiently to trigger a. High input resistance and high output resistance b. Pin Configuration: Let's see the pin configuration and testing of op-amps. To investigate the use of an op-amp as a Differentiator.The op-amp shown in the figure is ideal. The approximate transfer characteristic for the circuit shown below with an ideal operational amplifier and diode will be.

The circuit shown below is an example of a. For the circuit shown below, taking the opamp as ideal, the output voltage V out in terms of the input voltages V 1V 2 and V 3 is. Of the four characteristic given below, which are the major requirements for an instrumentation amplifier? High common mode rejection ratio Q. High input impedance R. High linearity S. High output impedance. Consider the circuit shown in the figure. The input voltage is sinusoidal with a frequency of 50 Hzrepresented as phasor with magnitude V i and phase angle 0 radian as shown in the figure. Assuming that the operational amplifier is not saturated, the time constant in millisecond of the output voltage V 0 is.

The operational amplifier shown in the figure is ideal. 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-off frequencies of F 1 and F 2 are f 1 and f 2 respectively.

The output voltage v 0 of the following circuit in the steady-state is. Given that the op-amps in the figure are ideal, the output voltage V 0 is. In the figure shown, assume the op-amp to be ideal. An operational-amplifier circuit is shown in the figure. The transfer characteristic of the Op-amp circuit shown in figure is. In the circuit shown below what is the output voltage V out in Volts if a silicon transistor Q and an ideal op-amp are used? In the circuit shown below the op-amps are ideal.

Then V out in Volts is. 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 filters will function as. Given that the op-amp is ideal, the output voltage V 0 is.

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The nature of feedback in the opamp circuit shown is. Under ideal conditions, the current i S from the source is. Transformer and emitter follower can both be used for impedance matching at the output of an audio amplifier.

The basic relationship between the input power P in and output power P out in both the cases is. An ideal opamp circuit and its input waveform are shown in the figures. The output waveform of this circuit will be. The block diagrams of two types of half wave rectifiers are shown in the figure.

The transfer characteristics of the rectifiers are also shown within the block. It is desired to make full wave rectifier using above two half-wave rectifiers.Post a Comment. In the figure, if the CMRR of the operational amplifier is 60 dB, then the magnitude of the output voltage is. Referring to the figure shown. The operational amplifier has a very poor open loop gain of 45, otherwise is ideal.

The gain of the amplifier is. The CMRR of the differential amplifier shown is. If the input to the circuit shown is a sine wave, the output will be.

Half wave rectified sine wave. Full wave rectified sine wave. Triangular wave. Square wave. You must give the values of important parameters of the sketch.

Sketch the waveform of voltages of V 1 and V 2 as a function of time. You must give the values of important parameters of this sketch.

### Operational Amplifiers Questions and Answers

An operational amplifier has an offset voltage of 1 mV and is ideal in all other respects. If this amplifier is used in the circuit shown in figure, the output voltage will be select the nearest value. The circuit of figure uses an ideal operational amplifier.

For small positive values of V inthe circuit works as. Half Wave Rectifier. Logarithmic amplifier. Exponential amplifier. Assume that the operational amplifier in figure is ideal. The circuit has a CMRR of What is the differential gain of the circuit? What is the common mode gain of the circuit? Consider the circuit shown in figure. This circuit uses an ideal operational amplifier.

## 300+ TOP OPAMP Circuits Questions and Answers pdf

Assuming that the impedance's at nodes A and B do not load the preceding bridge circuit, calculate the output voltage V o.

For the ideal operational amplifier circuit shown, determine the output voltage V o. Find the output voltage V o in the following circuit, assuming that the operational amplifier is ideal.

Assuming that the amplifier shown in the figure below is a voltage controlled voltage source.These short solved questions or quizzes are provided by Gkseries. View Answer. Toggle navigation E-Books. Computer Sc. Home GK op amp objective questions and answers. Go To Download Page Close. Answer: 1. A 10 volts. A Current controlled Current source. B Current controlled Voltage source. C Voltage controlled Voltage source. D Voltage controlled Current source.

Answer: Voltage controlled Voltage source. A 50KHz. Answer: 50KHz. Answer: 10 V. If Vi is a triangular wave, then V0 will be. A Square wave. B Triangular wave. C Parabolic wave. Answer: Sine wave. This is done basically to provide the op-amps with a very high. A CMMR.

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D Open-loop gain.A non inverting closed loop op amp circuit generally has a gain factor A. Less than one B. Greater than one C.

Of zero D. Equal to one. Answer :- B. So it will be always more than one. Not need an input resistor B. Be virtual ground C. Have high reverse current D. Not invert the signal.

The closed-loop voltage gain of an inverting amplifier equal to A. The ratio of the input resistance to feedback resistance B. The open-loop voltage gain C. The feedback resistance divided by the input resistance D. The input resistance. When a number of stages are connected in parallel, the overall gain is the product of the individual stage gains A.

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True B. An ideal OP-AMP is an ideal a Current controlled Current source b Current controlled voltage source c Voltage controlled voltage source d voltage controlled current source. Answer :- C. The ideal Opamp output voltage is maintained constant. It is controlled by input voltage.