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 Your email address will not be published.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