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100 TOP OPERATIONAL
AMPLIFIERS Questions and
Answers pdf
Posted on March 18, 2017 by engineer 1 Comment
OPERATIONAL AMPLIFIERS Questions and
Answers pdf :
- Explain what is an operational amplifier?
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.
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- State assumptions made for analyzing ideal op amp.
Assumptions made for analyzing ideal op amp are :
Infinite open loop gain Infinite input impedance Zero output impedance Perfect balance Infinite frqeuency bandwidth Infinite slew rate Infinite common mode rejection ratio Nil drift of characteristics with temperature
- Explain what is a voltage transfer curve of an op amp?
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.
OPERATIONAL AMPLIFIERS Questions and Answers
- Explain what are differential gain and common mode gain of a differential amplifier?
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
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AC noise
- Define offset voltage as applied to an op amp.
Input offset voltage may be defined as that voltage which is to be applied between the input terminals to balance the amplifier.
- Give the typical value of bias current for CA operational amplifier.
80nA
- Define slew rate.
Slew rate of an op amp is defined as the maximum rate of change of output voltage per unit time and is expresses in V/μs.
- Explain what kind of negative feedback is present in a noninverting op amp.
Negative voltage series feedback.
- Explain what is a voltage follower?
Voltage follower is an electronic circuit in which output voltage tracts the input voltage both in sign and magnitude.
- Explain what are the advantages of using a voltage follower amplifier?
Voltage follower has three unique characteristics viz. extremely high input impedance, extremely low output impedance and unity transmission gain and is , therefore, an ideal circuit device for use as a buffer amplifier.
- In Explain what way is the voltage follower a special case of the non inverting amplifier?
If feedback resistor is made zero or R1 is made ∞(by keeping it open circuited) in a noninverting amplifier circuit, voltage follower is obtained.
OPERATIONAL AMPLIFIERS Questions and Answers ::
- Explain what is an inverting amplifier?
In an inverting amplifier, the input is connected to the minus or inverting terminal of op amp.
- Explain what are the applications of an 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.
- Explain what is a differential amplifier?
Differential amplifier is a combination of inverting and noninverting amplifiers and amplifies the voltage difference between input lines neither of which is grounded.
- Give examples of linear circuits.
Adder, subtractor, differentiator, integrator fall under the category of linear circuits.
- Explain what is an adder or summing amplifier?
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.
- Explain what is an integrator?
An integrator is a circuit that performs a mathematical operation called integration.
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.
- Which OPAMP don’t have feedback loop? Comparator OPAMP (operational amplifier) don’t have feedback loop.
- Why OPAMP called direct coupled high differential circuit? OPAMP is called direct coupled because the input of one OPAMP is inserted into the input of another OPAMP. It is called high gain differential circuit because the difference of the two input is amplified.
- Why OPAMP called operational Amplifier? Important Interview questions on OPAMP OPAMP it is a direct coupled high gain differential input amplifier. 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.
- For the CMRR to be infinite what will be the condition? CMRR is defined as the ratio of differential voltage gain (Ad) to common mode voltage gain (Acm). The formula for CMRR is given below: CMRR = Ad/Acm If Acm will be zero then only it will be infinite.
- An ideal operational amplifier has A. infinite output impedance B. zero input impedance C. infinite bandwidth D. All of the above Answer: C
- Another name for a unity gain amplifier is: A. difference amplifier B. comparator C. single ended D. voltage follower Answer: D
- The open loop voltage gain (Aol) of an op amp is the A. external voltage gain the device is capable of B. internal voltage gain the device is capable of C. most controlled parameter D. same as Acl Answer: B
- A series dissipative regulator is an example of a: A. linear regulator B. switching regulator C. shunt regulator D. dc to dc converter Answer: A
- A noninverting 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
- In order for an output to swing above and below a zero reference, the op amp circuit requires:
C. an external circuit D. nothing Answer: D
- A portion of the output that provides circuit stabilization is considered to be: A. negative feedback B. distortion C. open loop D. positive feedback Answer: A
- The closed loop voltage gain of an inverting amplifier equals: A. the ratio of the input resistance to the feedback resistance B. the open loop voltage gain C. the feedback resistance divided by the input resistance D. the input resistance Answer: C
- All of the following are basic op amp input modes of operation EXCEPT A. inverting mode B. common mode C. double ended D. single ended Answer: A
- A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier? A. common mode B. darlington C. differential D. operational Answer: C
- With negative feedback, the returning signal A. is proportional to the output current
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B. is proportional to the differential voltage gain C. opposes the input signal D. aids the input signal Answer: C
- The ratio between differential gain and common mode gain is called: A. amplitude B. differential mode rejection C. common mode rejection D. phase Answer: C
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AMPLIFIERS QUESTIONS AND ANSWERS PDF”
DECEMBER 27, 2016 AT 7:32 PM It was helpful to understand the concepts of opamp. Thank you
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Haftu Hiluf
