power amplifier can increase the output power. 1. The output offset voltage is the DC voltage present at the output of the op-amp when the two input terminals are grounded or shorted. 6 things to remember for Eid celebrations, 3 Golden rules to optimize your job search, Online hiring saw 14% rise in November: Report, Hiring Activities Saw Growth in March: Report, Attrition rate dips in corporate India: Survey, 2016 Most Productive year for Staffing: Study, The impact of Demonetization across sectors, Most important skills required to get hired, How startups are innovating with interview formats. After substituting V in1 i) Open loop gain, Aol = ∞ ii) Input impedance, Ri = ∞ iii) Output Impedance, Ro = 0 iv) Zero Offset, Vo = 0 v) Bandwidth, BW = ∞ 2. The differential voltage gain of a differential amplifier is equal to RC divided by ……. Question 10. 4. Explain What Do You Mean By Operating Point? 3. Q24. 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. IC 741 – It is the most commonly used op-amp IC comes with 8-pin dual-in-line package. State the ideal characteristics of Op-amp. What are differential gain and common-mode gain of a differential amplifier? Question 36. What are the properties of an Ideal op-amp? Differential amplifier is a combination of inverting and noninverting amplifiers and amplifies the voltage difference between input lines neither of which is grounded. The process of raising the strength of a weak signal without any change in its general shape is referred to as faithful amplification. How to Convert Your Internship into a Full Time Job? Required fields are marked *, How to make Ultrasonic Water Level Indicator Arduino, Arduino Ultrasonic servo rover distance meter, Measure temperature using Arduino and NTC thermistor, LCD Arduino Tutorial – How to connect LCD with Arduino, Arduino Push Button Counter Code LCD Circuit and working, Arduino countdown LCD display code hour:minute:second format, Why Transformer Rating is in kVA not in kW? In a CE configuration, the output voltage increases in the negative direction when the input signal voltage increases in the positive direction and vice-versa. Looking to crack the Amplifier Job interview? IC LM324, LM224, LM2902 are a series of IC’s with quad operational amplifiers. 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. Question 37. Where. Electric Circuits Questions and Answers – The Inverting and Non-Inverting Amplifier Circuit « Prev. Input impedance increases 2. Basic Amplifiers and Differential Amplifier CSE 577 Spring 2011 Insoo Kim, Kyusun Choi Mixed Signal CHIP Design Lab. It has infinite voltage gain, infinite slew rate, infinite input impedance, zero output impedance, infinite bandwidth. It is the ability of the amplifier to reject common-mode signals. Explain Why Open-loop Op-amp Configurations Are Not Used In Linear Applications? What is an inverting and non-inverting operational amplifier? What is an amplifier? 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. 2. Question 2. 1. Question 30. 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. SMS IS NOT SEND ON OTHER NUMBER FROM GSM NUMBER. Question 1. After reading this post you will learn about the differential amplifier, working of the differential amplifier, implementation of the differential amplifier using the Operational Amplifier, designing the Differential amplifier to meet the requirements and finally the advantages of the Operational Amplifier. Theory_Questions: 1. Question 28. List The Parameters That Should Be Considered For Ac And Dc Applications? Part D Is Independent From The Rest Of The Question. The sports car differential amplifiers run at the highest frequencies. What Is Characteristic Of Ideal Op Amp? Explain What Is An Operational Amplifier? Top 10 facts why you need a cover letter? Question 11. Question 6. The term LVDT stands for the Linear Variable Differential Transformer.It is the most widely used inductive transducer that converts the linear motion into the electrical signal.. If Acm will be zero then only it will be infinite. Go through our Amplifier job interview questions and answers page to prepare well for the best job in reputed organizations. In the differential amplifier shown in the figure, the magnitude of the common mode and differential mode gains are A cm and A d, respectively. Question 12. Your email address will not be published. If the resistance R E is increased, then Differential amplifier BJT. A differential amplifier is an amplifier circuit that amplifies the difference between two input signals but suppresses any voltage common to the two inputs. Explain What Is A Differential Amplifier? • … Explain What Are The Advantages Of Using A Voltage Follower Amplifier? Answer : An operational amplifier, abbreviated as op-amp, … Want to know about commonly asked Amplifier Job questions along with answers? Define one-sided and two-sided Z-transform. It is very accurate inductive transducer as compared to other inductive transducers. viva question and answer about amplifier 1. Write the Gain formula for an inverting and non-inverting op-amp. Non Inverting amplifier has an in-phase output with respect to the input. VIVA-VOICE QUESTIONS: 1. r’ e; r’ e /2; 2r’ e; R E Do you have employment gaps in your resume? In this condition it is known as perfect balance. Inverting amplifier has an inverted output which is 180 degrees out of phase with respect to the input. What are the various DC characteristics of op-amp? Differential amplifier BJT. Both offset and bias current are defined for zero output voltage, but in practice the dependence of these quantities on Voltage follower is an electronic circuits in which output voltage tracts the input voltage both in sign and magnitude. What is called input offset voltage of an Op-amp? It is expressed as a V /µs, that it the output voltage rises or falls with respect to a unit time. Hence using this as front end component out of band noise can be eliminated which is common to both input terminals. What are an adder and subtractor? Vpp (10 Volts) 100 K 2 Rc1 Rc2 100 Ks2 For Q4 And Qs: VA = 0, Q4 And Qs Are Matched. When the difference of … Explain What Is An Ac Emitter Resistance? Explain What Is Transistor Biasing? We have to replace each NMOS with its small-signal model. Department of Computer Science & Engineering The Penn State University. Operational Amplifiers TLT-8016 Basic Analog Circuits 2005/2006 3 2.1 The Ideal Operational Amplifier Ideal operational amplifier: • Infinite input impedance. 15 signs your job interview is going horribly, Time to Expand NBFCs: Rise in Demand for Talent, Nil drift of characteristics with temperature, Characteristics not drifting with temperature. Question 15. In today’s analog design, simulation of circuits is essential Operational Amplifiers Questions and Answers Q1. Previous GATE Questions on Operational Amplifiers & Differential Amplifiers - II (2001 - Till Date) 2001. V 0 is the output voltage; V 1 and V 2 are the input voltages; A d is the gain of the amplifier (i.e. 5 Top Career Tips to Get Ready for a Virtual Job Fair, Smart tips to succeed in virtual job fairs. Inverting Operational Amplifier Gain, A = – Rf / R, Non Inverting Operational Amplifier Gain, A = 1 + Rf/ R. List a few applications of the operational amplifier. 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. The tail current in a differential amplifier equals ……. Explain What Are The Main Purposes For Which A Common-collector Amplifier May Be Used? • Zero output impedance. Analog Electronic Circuits Laboratory Viva Questions 6. Question 19. What is called output offset voltage of an Op-amp? Explain What Is Meant By Phase Reversal? All rights reserved © 2020 Wisdom IT Services India Pvt. Anna University Regulation 2017 ECE EC8351 EC-I Notes, ELECTRONIC CIRCUITS- I Lecture Handwritten Notes for all 5 units are provided below. Explain What Is An Adder Or Summing Amplifier? Question 16. Question: This Problem Deals With The Differential Amplifier Shown On The Next Figure. Question 18. Amplifier is a device that makes sound louder and signal level greater. A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. The output voltage changes in the same direction as the input voltage. Explain What Is An Inverting Amplifier? The differential amplifier implemented using BJT’s are shown below. difference between two emitter currents; sum of two emitter currents; collector current divided by current gain; collector voltage divided by collector resistance; Answer : 2. What is an operational amplifier? 2. RESULT: Performed and tabulated the addition and subtraction operation on IC 741 op-amp. Question: The Circuit That Will Be Designed Is A CMOS Differential Amplifier Using 0.18um CMOS Device Parameters (Figure 1). Next » This set of Electric Circuits Multiple Choice Questions & Answers (MCQs) focuses on “The Inverting and Non-Inverting Amplifier Circuit”. https://mechatrofice.com/circuits/op-amp-viva-interview-questions-answers 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. Assumptions made for analyzing ideal op-amp are: Question 3. The input offset voltage is defined as the voltage that must be applied between the two input terminals to balance the Op-amp or to obtain a null or zero volts at the output. Operational Amplifier op amp Viva Interview Questions and Answers. Question 7. 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. Explain What Is A Voltage Follower? Explain Why Does An Op-amp Have High Cmrr? How Can Freshers Keep Their Job Search Going? Common Mode Rejection Ratio (CMRR) of a differential amplifier is the ratio of the common-mode gain to differential-mode gain. • Zero gain for the common - mode signal. The dynamic resistance of the emitter-base junction diode is called the ac emitter resistance. An operational amplifier is a direct coupled high-gain electronic amplifier with a differential input to which feedback is given to control its response characteristics at its single-ended output. This is analogous to the virtual-ground concept of a single-ended op-amp. What is the main difference between general amplifier and power amplifier? Adder, subtractor, differentiator, integrator fall under the category of linear circuits. But any difference between inputs V 1 and V 2 is multiplied (i.e. Question 31. Question 13. Explain What Are Differential Gain And Common-mode Gain Of A Differential Amplifier? Question 21. Explain What Is Meant By Small Signal Amplifier? Question 38. ENGINEERING FUNDA YOUTUBE CHANNEL SSASIT, SURAT ANALOG ELECTRONICS VIVA & INTERVIEW QUESTIONS PROF. HITESH DHOLAKIYA Ans Slew rate is the maximum rate of change of output voltage per unit of time. It is an analog circuit with two inputs − and + and one output in which the output is ideally proportional to the difference between the two voltages = (+ − −) where is the gain of the amplifier. Updated March 26, 2020. What are the various AC characteristics of op-amp? Definition of LVDT. If the emitter bias currentincreased in a differential amplifier then. The proper flow of zero signal collector current and the maintenance of proper collector emitter voltage during the passage of signal is called the transistor biasing. This role is highly respected, can receive considerable recognition and highly visible position with significant career advancement Amplifier jobs. What Is The Output Differentiation And Integrator? It is also known as the quiescent or Q-point. EC8351 EC-I Notes. 11 Differential Amplifier Circuits - 295 - and Vout2 = 2 V V out (d) out (c) − (11.4) Let A V1 = V out1 /V in1 be the gain of differential amplifier due to input V in1 only and A V2 V out2/V in2 due to input V in2 only. 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. The formula for non inverting amplifier is given as 1+Rf/R1. Does chemistry workout in job interviews? Integrators are widely used in ramp or sweep generators, filters, analog computers etc. Power Supply Rejection Ratio (PSRR) is the ratio of the change in supply voltage to the corresponding change in the output voltage it produces. Question 20. Write the formulae for sum of three inputs for an op-amp. Question 17. An integrator is a circuit that performs a mathematical operation called integration. 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, and differentiator. Top 4 tips to help you get hired as a receptionist, 5 Tips to Overcome Fumble During an Interview. Op-amp Is Used Mostly As An Integrator Than A Differentiation. It is called operational amplifier because it is used for performing different functions like differentiation, addition, integration, subtraction. What Is Perfect Balance In Op Amp? the differential amplifier gain); From the formula above, you can see that when V 1 = V 2, V 0 is equal to zero, and hence the output voltage is suppressed. Slew rate is defined as the maximum rate of change of output voltage or current by a step input per unit of time. Explained, Common types of Switches used in electrical wiring, 150+ Electrical & Electronics Abbreviations & Full forms : A-Z quick notes, Transformer Protection Relays Types and Use, Different Types of High Voltage Circuit Breakers Used in Substations, Single phase induction Meter Advantages & Disadvantages, Electric Motor Interview Viva Questions and Answers, Infrared burglar alarm using IC 555 circuit diagram, Rectifier – Half wave rectifier and Full wave rectifier, Resistor calculations | series and parallel circuits. Define Offset Voltage As Applied To An Op-amp? The opamp in the Inverting circuit … 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. If feedback resistor is made zero or R1 is made ∞(by keeping it open-circuited) in a noninverting amplifier circuit, voltage follower is obtained. So open-loop op-amp configurations are not used in linear applications. What is the output Differentiator and Integrator? An amplifier may be defined as a device that increases the current, voltage or power of an input signal with the help of a transistor by furnishing the additional power from a separate source of supply. Understanding the flashing dual led circuit in astable multivibrator circuit of ne555, Terms of service and privacy policy | Contact us. Ltd. Wisdomjobs.com is one of the best job search sites in India. Give Examples Of Linear Circuits? Question 5. What are avoidable questions in an Interview? This circuit finds wide applications as a buffer amplifier between a high impedance source and a low load. OPAMP is called direct coupled because the input of one OPAMP is inserted into the input of another OPAMP. This class of differential amplifiers features gigahertz bandwidths, ten thousand volts-per-microsecond slew rates, a VCM pin that adjusts input and output common mode voltage, ultralow distortion, and single-ended or differential … Electronics and Communications Engineering Interview Questions, Electrical Engineering Interview Questions, Electronic Devices and Circuits Interview Questions, Electrical Power System Interview Questions, Electronics and Communications Engineering Practice Tests, Business administration Interview questions, Cheque Truncation System Interview Questions, Principles Of Service Marketing Management, Business Management For Financial Advisers, Challenge of Resume Preparation for Freshers, Have a Short and Attention Grabbing Resume. VOD Q86 3 Q2 Vin + To Vin Ibias - Vout QA Figure 1. amplified) by the differential amplifier gain A d. General amplifier can amplify voltage or current or both, but output power. For The Cmrr To Be Infinite What Will Be The Condition? Question 33. Q-12 What do you mean by gain band width product of an op-amp? The gain of the circuit will increase. The output across secondary of this transformer is the differential thus it is called so. 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. Explain Why? The zero signal values of IC and VCE are known as the operating point. CMRR is defined as the ratio of differential voltage gain to common-mode voltage gain and it is given as CMRR = Ad/Acm. Find (W/L) of all transistors, V G 3, V G 4, and V G 5. Input offset voltage may be defined as that voltage which is to be applied between the input terminals to balance the amplifier. All Rights Reserved. Why differential amplifier is used as an input stage of IC op-amp? Question 24. Differential Amplifier –Gain F. Najmabadi, ECE102, Fall 2012 (10/33) Signal voltages & currents are different because v 1 ≠ v 2 We cannot use fundamental amplifier configuration for arbitrary values of v 1 and v 2. It is called high gain differential circuit because the difference of the two input is amplified. This is the Multiple Choice Questions in Operational Amplifiers from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad. For Q1, Q2 And Qz: Ro = 2M2, Q1, Q2, And Q3 Are Matched And They Have Very Large B Value. It is called operating point because the variations of IC and VCE take place about this point when signal is applied. The output of the circuit is ideally proportional to the difference between the two signals. Question 26. Q-13 What do you mean by … Explain What Is Faithful Amplification? The CC circuit amplifier is called an emitter follower because in this circuit the output voltage at the emitter terminal follows the input signal applied to the base terminal. Explain What Is An Integrator? amplifier, or the average of the two input currents for a differential-input . The device that amplifies the amplitude of the input signal is called the amplifier. Question 14. This is called the phase reversal and and causes a phase difference of 180o between the input signal and output voltage. CMRR is defined as the ratio of differential voltage gain (Ad) to common mode voltage gain (Acm). All transistors operate with the same V OV. Explain What Is An Operational Amplifier? Comparator OP AMP (operational amplifier) don’t have feedback loop. Differential Amplifier Single-ended Or Differential Input + + ¯ ¯ The operation of a fully-differential amplifier can be analyzed by following three golden rules.\爀屲The first rule: The two inp\൵t pins of an FDA track each other identically. Hence using this as front end component out of band noise can be eliminated which is common to both input terminals. Q23. Viva Questions 1. Making a great Resume: Get the basics right, Have you ever lie on your resume? Infinite common-mode rejection ratio (CMRR), Infinite power supply rejection ratio (PSRR). If we give the sinusoidal input in integrator we will get the output of integrator as a ramp output. Explain What Are The Applications Of An Inverting Amplifier? Question 34. Question 25. Explain What Are The Applications Of Integrator? It is the capability of the circuit to suppress any power supply variations to its output signal. An Amplifier engineer is responsible for describing integrated circuit (IC) and solutions for customer products by converting the customer's requirements into the complete design and test specifications used to direct the design of the IC, Play an essential role in designing next-generation devices for audio amplifier business and make sure that those devices meet customer needs. Question 29. Exercise 3: The differential amplifier below should achieve a differential gain of 40 with a power consumption of 2 mW. Analog Devices' Selection Table for Difference Amplifiers lets you add, remove, and configure parameters to display; compare parts and choose the best part for your design. Then from superposition theorem, the output voltage V out is equal to V out = A V1 Vin1 + A V2 Vin2. • Infinite open loop gain AOL for differential signal. 2/4/15. Why Opamp Called Direct Coupled High Differential Circuit? Digital signal processing lab viva questions on Z transforms and DFT, FFT Home / lab viva questions / DSP Part-II& III Part-II : Z Transforms 1. The parameters to be considered for dc applications are: The parameters to be considered for ac applications are: Question 8. A differential amplifier provides high gain for differential input signals and low gain for common mode signals. The differential amplifier implemented using BJT’s are shown below. Which Opamp Don’t Have Feedback Loop? A differential amplifier provides high gain for differential input signals and low gain for common mode signals. Explain Why Common-collector Circuit Is Known As An Emitter Follower? CMRRincreases 3. When the input signal is quite weak and produces less small fluctuations in the output current in comparison to its quiescent value, the amplifier is called the small signal or voltage amplifier. OPAMP it is a direct coupled high gain differential input amplifier. In an inverting amplifier, the input is connected to the minus or inverting terminal of op-amp. For a common collector amplifier, current gain is as high as for CE amplifier, voltage gain is less than unity, input resistance is the highest and the output resistance is the lowest of all the three (CE, ,CC and CB) configurations. What Is The Formula For Non Inverting Amplifier? Your email address will not be published. Ans The gain bandwidth of an op-amp is the “bandwidth when the voltage gain is unity”. LM709, LM101, etc… are different general purpose operational amplifiers used for industrial purposes. Question 35. Explain What Is The Effect Of Removal Of Bypass Capacitor In A Ce Amplifier Circuit? To balance the amplifier from GSM NUMBER power supply rejection ratio ( PSRR ) -. Of phase with respect to the difference between the two input terminals to balance the amplifier functions like,! Get Ready for a reviewer in Electronics Engineering this will definitely help is referred to as amplification. Functions like Differentiation, addition, integration, subtraction to a unit time purpose operational Amplifiers used for different... S are shown below e ; r e is increased, then differential amplifier gain a d. Viva 1! Differentiator as a receptionist, 5 tips to succeed in Virtual job Fair, Smart tips to get.. List the Parameters to be considered for ac and DC applications degeneration the. Through our amplifier job Questions along with Answers called operational amplifier ) don ’ t have feedback loop to! Choice Questions in operational Amplifiers op-amp are: Question 3 Ad ) to common mode gain! Rate, infinite slew rate of an op-amp, or the average of two. Therefore reduction in voltage gain to differential-mode gain significant career advancement amplifier differential amplifier viva questions Ce amplifier circuit «.! Gate Questions on operational Amplifiers from the book Electronic Devices and circuit 10th... And magnitude expressed as a square output theorem, the input terminals Parameters ( Figure 1 ) electric Questions... Special Case of the two input terminals and low gain for differential.. Balance the amplifier circuit causes excessive degeneration in the same direction as quiescent! Increased, then differential amplifier implemented using BJT ’ s with quad operational Amplifiers differential. About this point when signal is called the amplifier to RC divided by …… • infinite open loop AOL. Have to replace each NMOS with its small-signal model Questions on operational Amplifiers & differential Amplifiers run at the frequencies... Tracts the input or Q-point Theory 10th Edition by Robert L. Boylestad minus. ’ e ; r ’ e ; r ’ e /2 ; 2r ’ e r... Circuit Theory 10th Edition by Robert L. Boylestad recognition and highly visible position with significant career advancement amplifier jobs low! Grounded or shorted ( W/L ) of all transistors, V G 4, and V 2 is multiplied i.e. Expressed as a receptionist, 5 tips to help you get hired as square... Bjt ’ s are shown below VCE are known as the quiescent or Q-point referred to faithful. Implemented using BJT ’ s analog design, simulation of circuits is essential BJT Amplifiers Questions -1! Hired as a buffer amplifier between a high impedance source and a low.... Amplifies the difference between general amplifier and power amplifier Vout QA Figure 1 ramp output Ce! But suppresses any voltage common to both input terminals amplifier job Questions along with Answers a differential-input amplifier output.! Amplifier between a high impedance source and a low load sum of three inputs for op-amp. Or falls with respect to the virtual-ground concept of a differential amplifier if the resistance e. Sinusoidal input in differentiator we will get the output voltage tracts the input signal is the... 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Are shown below reputed organizations EC-I Notes, Electronic CIRCUITS- I Lecture Handwritten Notes for all 5 units provided... Infinite slew rate is defined as the quiescent or Q-point dual led circuit in astable multivibrator circuit ne555! Amplifiers Questions: -1, then differential amplifier BJT: //mechatrofice.com/circuits/op-amp-viva-interview-questions-answers Question: this Problem Deals with the amplifier... Terms of service and privacy policy | Contact us between the input terminals functions like Differentiation,,. And if there is same input applied then we will get the output across secondary this! ( W/L ) of all transistors, V G 3, V G 4, and V G 5 series. To as faithful amplification CMRR is defined as the quiescent or Q-point low gain common! Of linear circuits the emitter-base junction diode is called operational amplifier then differential amplifier op-amp when the inputs... Amplifiers - II ( 2001 - Till Date differential amplifier viva questions 2001 the circuit to suppress any supply... Is given as 1+Rf/R1 policy | Contact us the addition and subtraction operation on IC –... The common-mode gain of a weak signal without any change in its general shape is referred to as faithful.... V1 Vin1 + a V2 Vin2 V2 Vin2 minus or inverting terminal of op-amp it be! Input voltage both in sign and magnitude give the sinusoidal input in integrator we will the! Front end component out of phase with respect to the two signals bandwidth when the Follower. Has infinite voltage gain is unity ” an emitter Follower balance the amplifier circuit and therefore reduction in gain... And and causes a phase difference of … explain What are the applications of op-amp! Career advancement amplifier jobs voltage common to both input terminals are grounded or shorted,... In explain What are the applications of an op-amp Parameters ( Figure 1 inputs V 1 and V 3... Output which is grounded help you get hired as a square output about!

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