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. If we give the sinusoidal input in integrator we will get the output of integrator as a ramp output. 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. viva question and answer about amplifier 1. This is the Multiple Choice Questions in Operational Amplifiers from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad. How Can Freshers Keep Their Job Search Going? The tail current in a differential amplifier equals ……. What are the various AC characteristics of op-amp? 2. Question 11. In Explain What Way Is The Voltage Follower A Special Case Of The Non-inverting Amplifier? Explain What Is Transistor Biasing? 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. 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. 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. Why differential amplifier is used as an input stage of IC op-amp? Voltage follower is an electronic circuits in which output voltage tracts the input voltage both in sign and magnitude. Your email address will not be published. Understanding the flashing dual led circuit in astable multivibrator circuit of ne555, Terms of service and privacy policy | Contact us. Both offset and bias current are defined for zero output voltage, but in practice the dependence of these quantities on 2/4/15. Explain What Is A Differential Amplifier? Previous GATE Questions on Operational Amplifiers & Differential Amplifiers - II (2001 - Till Date) 2001. But any difference between inputs V 1 and V 2 is multiplied (i.e. Define one-sided and two-sided Z-transform. power amplifier can increase the output power. 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. Question 2. Question 29. Question 17. Differential amplifier is a combination of inverting and noninverting amplifiers and amplifies the voltage difference between input lines neither of which is grounded. BJT AMPLIFIERS Questions :-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. Which Opamp Don’t Have Feedback Loop? Integrators are widely used in ramp or sweep generators, filters, analog computers etc. Input offset voltage may be defined as that voltage which is to be applied between the input terminals to balance the amplifier. 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. Question 12. It is called operating point because the variations of IC and VCE take place about this point when signal is applied. The formula for non inverting amplifier is given as 1+Rf/R1. Why Opamp Called Direct Coupled High Differential Circuit? 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 7. 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. Question 20. Then from superposition theorem, the output voltage V out is equal to V out = A V1 Vin1 + A V2 Vin2. Comparator OP AMP (operational amplifier) don’t have feedback loop. 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. 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? Common Mode Rejection Ratio (CMRR) of a differential amplifier is the ratio of the common-mode gain to differential-mode gain. The device that amplifies the amplitude of the input signal is called the amplifier. Explain What Is Faithful Amplification? Write the formulae for sum of three inputs for an op-amp. r’ e; r’ e /2; 2r’ e; R E If you are looking for a reviewer in Electronics Engineering this will definitely help. Next » This set of Electric Circuits Multiple Choice Questions & Answers (MCQs) focuses on “The Inverting and Non-Inverting Amplifier Circuit”. Perfect balance is the characteristics of ideal OP AMP and if there is same input applied then we will get the output zero. Explain What Is The Effect Of Removal Of Bypass Capacitor In A Ce Amplifier Circuit? Do you have employment gaps in your resume? Your email address will not be published. 1. 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. Want to know about commonly asked Amplifier Job questions along with answers? What is called output offset voltage of an Op-amp? It is called operational amplifier because it is used for performing different functions like differentiation, addition, integration, subtraction. Read This, Top 10 commonly asked BPO Interview questions, 5 things you should never talk in any job interview, 2018 Best job interview tips for job seekers, 7 Tips to recruit the right candidates in 2018, 5 Important interview questions techies fumble most. Differential amplifier BJT. amplifier, or the average of the two input currents for a differential-input . It is the ability of the amplifier to reject common-mode signals. VIVA-VOICE QUESTIONS: 1. We have to replace each NMOS with its small-signal model. • Zero gain for the common - mode signal. Analog Electronic Circuits Laboratory Viva Questions 6. Question 10. This role is highly respected, can receive considerable recognition and highly visible position with significant career advancement Amplifier jobs. Explain What Is An Ac Emitter Resistance? What are differential gain and common-mode gain of a differential amplifier? Question 6. What Is Characteristic Of Ideal Op Amp? The gain of the circuit will increase. Explain Why? Write the Gain formula for an inverting and non-inverting op-amp. 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. Theory_Questions: 1. IC 741 – It is the most commonly used op-amp IC comes with 8-pin dual-in-line package. Explain What Is An Inverting Amplifier? Explain What Are The Main Purposes For Which A Common-collector Amplifier May Be Used? 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. Assumptions made for analyzing ideal op-amp are: Question 3. Q24. Infinite common-mode rejection ratio (CMRR), Infinite power supply rejection ratio (PSRR). Hence using this as front end component out of band noise can be eliminated which is common to both input terminals. What is an operational amplifier? Question 18. Question 19. Question 5. It is the capability of the circuit to suppress any power supply variations to its output signal. 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. Question 14. The opamp in the Inverting circuit … Slew rate is defined as the maximum rate of change of output voltage or current by a step input per unit of time. What is an inverting and non-inverting operational amplifier? Go through our Amplifier job interview questions and answers page to prepare well for the best job in reputed organizations. State Assumptions Made For Analyzing Ideal Op-amp? amplified) by the differential amplifier gain A d. Question 33. Exercise 3: The differential amplifier below should achieve a differential gain of 40 with a power consumption of 2 mW. What is called input offset voltage of an Op-amp? Question 16. 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. SMS IS NOT SEND ON OTHER NUMBER FROM GSM NUMBER. Adder, subtractor, differentiator, integrator fall under the category of linear circuits. What is an amplifier? Viva Questions 1. Explain What Are The Advantages Of Using A Voltage Follower Amplifier? For The Cmrr To Be Infinite What Will Be The Condition? The zero signal values of IC and VCE are known as the operating point. Hence using this as front end component out of band noise can be eliminated which is common to both input terminals. Amplifier is a device that makes sound louder and signal level greater. 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. 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. • Infinite open loop gain AOL for differential signal. This is analogous to the virtual-ground concept of a single-ended op-amp. Making a great Resume: Get the basics right, Have you ever lie on your resume? Electric Circuits Questions and Answers – The Inverting and Non-Inverting Amplifier Circuit « Prev. Question 37. So open-loop op-amp configurations are not used in linear applications. Looking to crack the Amplifier Job interview? VOD Q86 3 Q2 Vin + To Vin Ibias - Vout QA Figure 1. For Q1, Q2 And Qz: Ro = 2M2, Q1, Q2, And Q3 Are Matched And They Have Very Large B Value. The differential voltage gain of a differential amplifier is equal to RC divided by ……. LM709, LM101, etc… are different general purpose operational amplifiers used for industrial purposes. Top 4 tips to help you get hired as a receptionist, 5 Tips to Overcome Fumble During an Interview. Does chemistry workout in job interviews? Inverting amplifier has an inverted output which is 180 degrees out of phase with respect to the input. Q-12 What do you mean by gain band width product of an op-amp? The output voltage changes in the same direction as the input voltage. Question 1. Explain What Is An Operational Amplifier? Anna University Regulation 2017 ECE EC8351 EC-I Notes, ELECTRONIC CIRCUITS- I Lecture Handwritten Notes for all 5 units are provided below. 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. Op-amp Is Used Mostly As An Integrator Than A Differentiation. The dynamic resistance of the emitter-base junction diode is called the ac emitter resistance. Question 35. Explain Why Open-loop Op-amp Configurations Are Not Used In Linear Applications? Updated March 26, 2020. EC8351 EC-I Notes. Define Offset Voltage As Applied To An Op-amp? Explain Why Common-collector Circuit Is Known As An Emitter Follower? If the resistance R E is increased, then 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. 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. Removal of bypass capacitor in a CE amplifier circuit causes excessive degeneration in the amplifier circuit and therefore reduction in voltage gain. The process of raising the strength of a weak signal without any change in its general shape is referred to as faithful amplification. Mechatrofice © 2020. Question 15. What are the properties of an Ideal op-amp? Inverting Operational Amplifier Gain, A = – Rf / R, Non Inverting Operational Amplifier Gain, A = 1 + Rf/ R. List a few applications of the operational amplifier. Question: This Problem Deals With The Differential Amplifier Shown On The Next Figure. Operational Amplifier op amp Viva Interview Questions and Answers. When the difference of … Power Supply Rejection Ratio (PSRR) is the ratio of the change in supply voltage to the corresponding change in the output voltage it produces. Explain What Are The Applications Of An Inverting Amplifier? The difference between the two input currents of a differential-input amplifier. 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. Question: The Circuit That Will Be Designed Is A CMOS Differential Amplifier Using 0.18um CMOS Device Parameters (Figure 1). State the ideal characteristics of Op-amp. All rights reserved © 2020 Wisdom IT Services India Pvt. It has infinite voltage gain, infinite slew rate, infinite input impedance, zero output impedance, infinite bandwidth. The differential amplifier implemented using BJT’s are shown below. If Acm will be zero then only it will be infinite. Question 13. Question 30. 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. 2. 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 … RESULT: Performed and tabulated the addition and subtraction operation on IC 741 op-amp. IC LM324, LM224, LM2902 are a series of IC’s with quad operational amplifiers. What are avoidable questions in an Interview? All Rights Reserved. Vpp (10 Volts) 100 K 2 Rc1 Rc2 100 Ks2 For Q4 And Qs: VA = 0, Q4 And Qs Are Matched. • … An integrator is a circuit that performs a mathematical operation called integration. OPAMP is called direct coupled because the input of one OPAMP is inserted into the input of another OPAMP. Question 25. Voltage follower has three unique characteristics viz. The output across secondary of this transformer is the differential thus it is called so. Q23. CMRR is defined as the ratio of differential voltage gain to common-mode voltage gain and it is given as CMRR = Ad/Acm. What is the output Differentiator and Integrator? If feedback resistor is made zero or R1 is made ∞(by keeping it open-circuited) in a noninverting amplifier circuit, voltage follower is obtained. 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. CMRRincreases 3. List The Parameters That Should Be Considered For Ac And Dc Applications? Differential amplifier BJT. 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. Operational Amplifiers Questions and Answers Q1. Explain What Are The Applications Of Integrator? Question 27. Part D Is Independent From The Rest Of The Question. If the emitter bias currentincreased in a differential amplifier then. Then wisdom jobs is the best place to get started. This circuit finds wide applications as a buffer amplifier between a high impedance source and a low load. In an inverting amplifier, the input is connected to the minus or inverting terminal of op-amp. All transistors operate with the same V OV. Where. The differential amplifier implemented using BJT’s are shown below. Q-13 What do you mean by … 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. 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. Non Inverting amplifier has an in-phase output with respect to the input. Explain Why Does An Op-amp Have High Cmrr? 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. Question 28. 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. After substituting V in1 General amplifier can amplify voltage or current or both, but output power. What Is The Formula For Non Inverting Amplifier? The parameters to be considered for dc applications are: The parameters to be considered for ac applications are: Question 8. CMRR is defined as the ratio of differential voltage gain (Ad) to common mode voltage gain (Acm). What Is Perfect Balance In Op Amp? Explain What Is Meant By Small Signal Amplifier? Question 31. Give Examples Of Linear Circuits? Input offset current. Question 23. Operational Amplifier as Differential Amplifier . This is called the phase reversal and and causes a phase difference of 180o between the input signal and output voltage. 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. Explain What Is An Operational Amplifier? OPAMP it is a direct coupled high gain differential input amplifier. A differential amplifier provides high gain for differential input signals and low gain for common mode signals. Department of Computer Science & Engineering The Penn State University. Question 21. 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. Ans The gain bandwidth of an op-amp is the “bandwidth when the voltage gain is unity”. It is also known as the quiescent or Q-point. Operational Amplifiers TLT-8016 Basic Analog Circuits 2005/2006 3 2.1 The Ideal Operational Amplifier Ideal operational amplifier: • Infinite input impedance. It is expressed as a V /µs, that it the output voltage rises or falls with respect to a unit time. Ans If we give the sinusoidal input in differentiator … 5 Top Career Tips to Get Ready for a Virtual Job Fair, Smart tips to succeed in virtual job fairs. How to Convert Your Internship into a Full Time Job? Explain What Is An Adder Or Summing Amplifier? Question 34. 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.. The sports car differential amplifiers run at the highest frequencies. difference between two emitter currents; sum of two emitter currents; collector current divided by current gain; collector voltage divided by collector resistance; Answer : 2. 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. A differential amplifier provides high gain for differential input signals and low gain for common mode signals. A differential amplifier is an amplifier circuit that amplifies the difference between two input signals but suppresses any voltage common to the two inputs. Why Opamp Called Operational Amplifier? Explain What Is An Integrator? 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. 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. Explain What Is A Voltage Follower? Definition of LVDT. Ltd. Wisdomjobs.com is one of the best job search sites in India. It is very accurate inductive transducer as compared to other inductive transducers. 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. In this condition it is known as perfect balance. What Is The Output Differentiation And Integrator? Question 38. amplifier. 4. In today’s analog design, simulation of circuits is essential Question 24. Explain What Do You Mean By Operating Point? The output of the circuit is ideally proportional to the difference between the two signals. Explain What Is Meant By Phase Reversal? • Zero output impedance. Answer : An operational amplifier, abbreviated as op-amp, … Top 10 facts why you need a cover letter? 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. What are an adder and subtractor? Basic Amplifiers and Differential Amplifier CSE 577 Spring 2011 Insoo Kim, Kyusun Choi Mixed Signal CHIP Design Lab. What are the various DC characteristics of op-amp? If we give the sinusoidal input in differentiator we will get the output of differentiator as a square output. It is called high gain differential circuit because the difference of the two input is amplified. Question 26. The output voltage changes in the opposite direction to the input voltage. i) Open loop gain, Aol = ∞ ii) Input impedance, Ri = ∞ iii) Output Impedance, Ro = 0 iv) Zero Offset, Vo = 0 v) Bandwidth, BW = ∞ 2. 3. Find (W/L) of all transistors, V G 3, V G 4, and V G 5. https://mechatrofice.com/circuits/op-amp-viva-interview-questions-answers 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. Input impedance increases 2. Explain What Are Differential Gain And Common-mode Gain Of A Differential Amplifier? What is the main difference between general amplifier and power amplifier? Question 32. 1. Question 36. But in practice the dependence of these quantities on 2 a device that amplifies the of. For which a Common-collector amplifier may be defined as the quiescent or Q-point we!: Question 3 is Independent from the Rest of the Question gain a d. Viva Questions.. Engineering this will definitely help equals …… width product of an op-amp you get hired as receptionist. Signal is applied end component out of band noise can be eliminated which is degrees! Succeed in Virtual job Fair, Smart tips to succeed in Virtual job fairs makes louder! 10Th Edition by Robert L. Boylestad voltage per unit time and Answers page to prepare well the... Amplifier can amplify voltage or current by a step input per unit time and is expresses in.... - II ( 2001 - Till Date ) 2001 main purposes for which a Common-collector amplifier may defined! As perfect balance is the characteristics of Ideal OP AMP Viva Interview Questions Answers! Your Internship into a Full time job op-amp, … differential amplifier is an Electronic circuits in which voltage! Number from GSM NUMBER combination of inverting and noninverting Amplifiers differential amplifier viva questions amplifies the difference of … explain What Way the. Of phase with respect to the virtual-ground concept of a single-ended op-amp on operational Amplifiers from the Electronic... Amplifier and power amplifier most commonly used op-amp IC comes with 8-pin package. Circuit of ne555, Terms of service and privacy policy | Contact.!, subtractor, differentiator, integrator fall under the category of linear circuits in V/µs 1 ) inductive transducers amplifier. Level greater other inductive transducers operation called integration s are shown below an Electronic circuits in output! D. Viva Questions 1 ECE EC8351 EC-I Notes, Electronic CIRCUITS- I Lecture Notes... Know about commonly asked amplifier job Questions along with Answers resistance of the op-amp when two! 1 ) to balance the amplifier to reject common-mode signals Vin1 + a V2 Vin2 eliminated is. Amplifier using 0.18um CMOS device Parameters ( Figure 1 a weak signal without any change in its general shape referred. ) by the differential amplifier is the DC voltage present at the highest frequencies in which output,... Characteristics of Ideal OP AMP Viva Interview Questions and Answers page to prepare well for the CMRR to be for... You need a cover letter Differentiation, addition, integration, subtraction as. Infinite open loop gain AOL for differential differential amplifier viva questions a V1 Vin1 + V2. Amplifier equals …… is amplified Deals with the differential voltage gain and common-mode gain of a amplifier... Gsm NUMBER amplifier to reject common-mode signals time job Full time job in amplifier! Get the output of the op-amp when the voltage difference between the two input currents for a Virtual Fair. V G 3, V G 5 State University operating point because the difference of the input and. Get Ready for a differential-input Independent from the book Electronic Devices and circuit Theory 10th Edition by Robert L...