Interview Questions.

Q1. Explain What Is An Operational Amplifier?

An operational amplifier, abbreviated as op-amp, is essentially a multi-stage, very excessive benefit, direct-coupled, poor feedback amplifier that uses voltage shunt feedback to provide a stabilized voltage benefit.

Q2. Explain What Are The Applications Of Integrator?

Integrators are broadly used in ramp or sweep turbines, filters, analog computer systems and many others.

Q3. State Assumptions Made For Analyzing Ideal Op-amp?

Assumptions made for studying perfect op-amp are:

Infinite open-loop gain

Infinite enter impedance

Zero output impedance

Perfect balance

Infinite frequency bandwidth

Infinite slew price

Infinite not unusual-mode rejection ratio

Nil go with the flow of characteristics with temperature

Q4. Explain What Do You Mean By Operating Point?

The zero signal values of IC and VCE are known as the running point. It is known as operating point because the versions of IC and VCE take region about this point whilst signal is carried out. It is likewise called the quiescent or Q-point.

Q5. Explain What Is Meant By Small Signal Amplifier?

When the input signal is quite susceptible and produces less small fluctuations within the output cutting-edge in evaluation to its quiescent price, the amplifier is known as the small sign or voltage amplifier.

Q6. What Is Amplifier?

Amplifier is a tool that makes sound louder and sign degree more.

Q7. Why Opamp Called Operational Amplifier?

OPAMP it's miles an instantaneous coupled excessive advantage differential enter amplifier. It is referred to as operational amplifier due to the fact it's far used for performing distinctive features like differentiation, addition, integration, subtraction. It has infinite voltage benefit, endless slew charge, countless input impedance, zero output impedance, limitless bandwidth.

Q8. Give Examples Of Linear Circuits?

Adder, subtractor, differentiator, integrator fall beneath the category of linear circuits.

Q9. Explain What Is Tristor Biasing?

The proper float of zero sign collector modern and the maintenance of right collector emitter voltage in the course of the passage of sign is referred to as the tristor biasing.

Q10. Explain What Is Faithful Amplification?

The system of raising the energy of a weak signal with none change in its trendy shape is called trustworthy amplification.

Q11. What Is The Formula For Non Inverting Amplifier?

The method for non inverting amplifier is given as 1+Rf/R1.

Q12. Explain What Are The Main Purposes For Which A Common-collector Amplifier May Be Used?

For a commonplace collector amplifier, present day benefit is as high as for CE amplifier, voltage benefit is much less than solidarity, input resistance is the best and the output resistance is the lowest of all of the three (CE, ,CC and CB) configurations. This circuit finds huge packages as a buffer amplifier among a high impedance source and a low load.

Q13. Define Offset Voltage As Applied To An Op-amp?

Input offset voltage may be described as that voltage that's to be applied between the input terminals to stability the amplifier.

Q14. Define Cmrr?

CMRR is described as the ratio of differential voltage advantage to commonplace-mode voltage advantage and it is given as CMRR = Ad/Acm.

Q15. What Is Characteristic Of Ideal Op Amp?

Characteristic of perfect OP AMP are

Infinite voltage gain

Zero output impedance

Infinite input impedance

Infinite slew rate

Characteristics now not drifting with temperature

Infinite bandwidth

Q16. Op-amp Is Used Mostly As An Integrator Than A Differentiation. Explain Why?

Op-amp is used mainly as an integrator than a differentiator due to the fact in differentiator at high frequency, gain is high and so excessive-frequency noise is likewise amplified which in reality summary the differentiated signal.

Q17. Explain What Is An Inverting Amplifier?

In an inverting amplifier, the enter is hooked up to the minus or inverting terminal of op-amp.

Q18. Explain What Is An Adder Or Summing Amplifier?

Adder or summing amplifier is a circuit that provides an output voltage proportional to or identical to the algebraic sum of  or more enter voltages accelerated through a consistent advantage aspect.

Q19. Explain Why Open-loop Op-amp Configurations Are Not Used In Linear Applications?

When an op-amp is operated within the open-loop configuration, the output both is going to positive saturation or negative saturation degrees or switches among advantageous and negative saturation degrees and as a result clips the output above those tiers. So open-loop op-amp configurations aren't used in linear programs.

Q20. Explain What Are Differential Gain And Common-mode Gain Of A Differential Amplifier?

When the distinction of the 2 inputs carried out to the 2 terminals of a differential amplifier is amplified, the consequent benefit is named as differential benefit. But when the 2 input terminals are linked to the same enter source then the benefit hooked up by using the differential amplifier is called the not unusual mode gain.

Q21. Explain What Is A Voltage Follower?

Voltage follower is an electronic circuits in which output voltage tracts the input voltage both in sign and value.

Q22. Explain Why Common-collector Circuit Is Known As An Emitter Follower?

The CC circuit amplifier is called an emitter follower due to the fact in this circuit the output voltage at the emitter terminal follows the enter sign carried out to the bottom terminal.

Q23. Explain Why Does An Op-amp Have High Cmrr?

High CMRR guarantees that the commonplace mode alerts consisting of noise are rejected correctly and the output voltage is proportional simplest to the differential enter voltage.

Q24. Explain What Is The Effect Of Removal Of Bypass Capacitor In A Ce Amplifier Circuit?

Removal of skip capacitor in a CE amplifier circuit reasons excessive degeneration in the amplifier circuit and therefore reduction in voltage gain.

Q25. Explain What Are The Advantages Of Using A Voltage Follower Amplifier?

Voltage follower has 3 precise traits viz. Extremely excessive input impedance, extraordinarily low output impedance and unity trmission gain and is , therefore, a super circuit tool to be used as a buffer amplifier.

Q26. Explain What Is An Ac Emitter Resistance?

The dynamic resistance of the emitter-base junction diode is known as the ac emitter resistance.

Q27. Define Slew Rate?

Slew fee of an op-amp is described because the maximum charge of trade of output voltage in step with unit time and is expresses in V/µs.

Q28. In Explain What Way Is The Voltage Follower A Special Case Of The Non-inverting Amplifier?

If comments resistor is made 0 or R1 is made ∞(by means of keeping it open-circuited) in a noninverting amplifier circuit, voltage follower is acquired.

Q29. Explain What Is A Differential Amplifier?

Differential amplifier is a combination of inverting and noninverting amplifiers and amplifies the voltage difference among enter lines neither of that's grounded.

Q30. Why Opamp Called Direct Coupled High Differential Circuit?

OPAMP is called direct coupled due to the fact the input of 1 OPAMP is inserted into the input of some other OPAMP. It is known as excessive benefit differential circuit due to the fact the distinction of the two enter is amplified.

Q31. Explain What Are The Applications Of An Inverting Amplifier?

Inverting amplifier is a very flexible aspect and may be used for performing range of mathematical stimulation including analog inverter, paraphrase amplifier, section shifter, adder, integrator, and differentiator.

Q32. List The Parameters That Should Be Considered For Ac And Dc Applications?

The parameters to be taken into consideration for dc packages are:

Input offset voltage

Input offset modern

Input bias modern

Drift

The parameters to be considered for ac packages are:

Gain bandwidth product (GBW)

Rise time

Slew charge

Full-power reaction

AC noise

Q33. What Is Perfect Balance In Op Amp?

Perfect stability is the traits of perfect OP AMP and if there's same input implemented then we are able to get the output 0. In this circumstance it's miles called perfect balance.

Q34. For The Cmrr To Be Infinite What Will Be The Condition?

CMRR is defined because the ratio of differential voltage gain (Ad) to commonplace mode voltage gain (Acm).

The formulation for CMRR is given below:

CMRR = Ad/Acm

If Acm can be 0 then most effective it will be endless.

Q35. Explain What Is Meant By Phase Reversal?

In a CE configuration, the output voltage increases in the negative direction while the enter sign voltage increases inside the high-quality direction and vice-versa. This is known as the segment reversal and and reasons a phase difference of 180o between the enter sign and output voltage.

Q36. What Is The Output Differentiation And Integrator?

If we deliver the sinusoidal input in differentiator we can get the output of differentiator as a rectangular output. If we give the sinusoidal input in integrator we will get the output of integrator as a ramp output.

Q37. Explain What Is An Integrator?

An integrator is a circuit that plays a mathematical operation known as integration.