Op amp gate questions pdf

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Op amp gate questions pdf

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.

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? Infinite voltage gain 2. Zero output impedance 3. Infinite slew rate 5. Characteristics not drifting with temperature 6. Infinite bandwidth. 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. 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.The formula for CMRR is given below:.

Ans Perfect balance is the characteristics of ideal OPAMP and if there is same input applied then we will get the output zero.

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.

It has infinite voltage gain, infinite slew rate, infinite input impedance, zero output impedance, infinite bandwidth. Ans 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. I think it will be helpful for those people who want to take preparation for an interview that is based on OPAMP…. About the Author: saarika Singh I am an Educationist at oureducation. I have overall 6 years of experience in the Education Industry. I guide people for the choice of thr Right Career Path as per their Interests.

I write many articles, blogs to make people aware of any kind of education they are looking For. Comment Name Email Website. Arpita Sardar says:.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. 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. 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.

I am Sasmita. At ElectronicsPost. And, if you really want to know more about me, please visit my "About" Page. Read More. Sasmita Hi!The output V o of the circuit is. Obtain an expression for V o in terms of V sR and the reverse saturation current I s of the transistor. The P-side of the diode is connected to node A and the N-side to node B. The circuit in the figure employs positive feedback and is intended to generate sinusoidal oscillations.

If this amplifier has to faithfully amplify sinusoidal signals form dc to 20 kHz without any slew rate induced distortion, then the input signal level must not exceed. Consider the circuit shown. Assume the operational amplifier is ideal. In which mode is the BJT operating active or saturation or cutoff?

300+ TOP OPAMP Circuits Questions and Answers pdf

Justify your answer. Obtain an expression relating the output current I o and the input voltage V i. If the input to the ideal comparator shown in the figure is a sinusoidal signal of 8 volts peak to peak, without any DC component, then the output of the comparator has a duty cycle of. If the differential voltage gain and the common mode voltage gain of a differential amplifier are 48 dB and 2 dB respectively, then common mode rejection ratio is.

The oscillator circuit shown in the figure has an ideal inverting amplifier. Its frequency of oscillation in Hertz is. The output voltage of the regulated power supply shown in the figure is. Voltage Controlled Current Source. Voltage Controlled Voltage Source. Current Controlled Current Source.

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Current Controlled Voltage Source. The circuit in the figure is a. Low pass filter. High pass filter.Post a Comment. In the figure, if the CMRR of the operational amplifier is 60 dB, then the magnitude of the output voltage is.

op amp gate questions pdf

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.

Multiple Choice Questions and Answers on Op-Amp ( Operational Amplifier )

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.

Basic Operational Amplifiers

You must give the values of important parameters of this sketch. 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.

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Logarithmic amplifier. Exponential amplifier.

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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.Determine the output voltage polarity of this op-amp with reference to groundgiven the following input conditions:.

Learning to mathematically analyze circuits requires much study and practice. Typically, students practice by working through lots of sample problems and checking their answers against those provided by the textbook or the instructor.

Operational Amplifiers Questions and Answers

While this is good, there is a much better way. For successful circuit-building exercises, follow these steps:. Avoid using the model op-amp, unless you want to challenge your circuit design skills. There are more versatile op-amp models commonly available for the beginner. One way you can save time and reduce the possibility of error is to begin with a very simple circuit and incrementally add components to increase its complexity after each analysis, rather than building a whole new circuit for each practice problem.

Another time-saving technique is to re-use the same components in a variety of different circuit configurations. It has been my experience that students require much practice with circuit analysis to become proficient. To this end, instructors usually provide their students with lots of practice problems to work through, and provide answers for students to check their work against. While this approach makes students proficient in circuit theory, it fails to fully educate them.

They also need real, hands-on practice building circuits and using test equipment. Another reason for following this method of practice is to teach students scientific method : the process of testing a hypothesis in this case, mathematical predictions by performing a real experiment.

Students will also develop real troubleshooting skills as they occasionally make circuit construction errors. Discuss these issues with your students in the same Socratic manner you would normally discuss the worksheet questions, rather than simply telling them what they should and should not do.

op amp gate questions pdf

I never cease to be amazed at how poorly students grasp instructions when presented in a typical lecture instructor monologue format! If your students will be working with real circuits, then they should learn on real circuits whenever possible. If your goal is to educate theoretical physicists, then stick with abstract analysis, by all means! But most of us plan for our students to do something in the real world with the education we give them. In most sciences, realistic experiments are much more difficult and expensive to set up than electrical circuits.

Nuclear physics, biology, geology, and chemistry professors would just love to be able to have their students apply advanced mathematics to real experiments posing no safety hazard and costing less than a textbook. Exploit the convenience inherent to your science, and get those students of yours practicing their math on lots of real circuits!

GATE 2017 Find the voltage gain of the amplifier using OP-AMP at 15 kHz

An operational amplifier is a particular type of differential amplifier. Most op-amps receive two input voltage signals and output one voltage signal:. Here is a single op-amp, shown under two different conditions different input voltages. Determine the voltage gain of this op-amp, given the conditions shown:. Follow-up question: convert this voltage gain figure as a ratio into a voltage gain figure in decibels.

A differential voltage gain ofis not unreasonable for a modern operational amplifier!

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A gain so extreme may come as a surprise to many students, but they will discover later the utility of such a high gain. Many op-amp circuits require a dual or split power supply, consisting of three power terminals: V, -V, and Ground.Analog Circuits. Marks 1 More.

op amp gate questions pdf

The upper and lower th Consider the constant current source shown in the figure below. The following signal Vi of peak voltage 8V is applied to the non-inverting terminal of an ideal Opamp. The transistor ha Assume that the opamp is id The circuit shown represents 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 The transfer characteristic for the precision rectifier circuit shown below is assume ideal OP-AMP and practical diode The input resistance Ri of the amplifier shown in the figure is An ideal Op-Amp is an ideal.

The circuit in the figure is a If the differential voltage gain and the common mode voltage gain of a differential Amplifier are 48 dB and 2 dB respect 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 oth The noise figure of this Amplifier as show The circuit shown in the figure is that of An op-Amp is used as a zero-crossing detector.

A change in the value of the Emitter resistance Re in a difference Amplifier.

op amp gate questions pdf

Marks 2 More. In the voltage reference circuit shown in the figure, the op-amp is ideal and the transistors Q1, Q2,….


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