Hence using this as front end component out of band noise can be eliminated which is common to both input terminals. Explain What Is An Operational Amplifier? In wireless receivers, weak-signal amplifiers are mainly used. Why amplifier gains will reduce at higher frequency? (a) remains unaffected (b) decreases by the same amount as the gain increase (c) increases by the sane saaaajajt as the gain decrease This set of Linear Integrated Circuit Multiple Choice Questions & Answers (MCQs) focuses on “Ideal Operational Amplifier”. ELECTRONICS SYSTEM DESIGN LAB VIVA Questions :-1. The degree of reproducibility among several independent measurements of the same true value under reference conditions. Question 23. How Can Freshers Keep Their Job Search Going? It is called operating point because the variations of IC and VCE take place about this point when signal is applied. An amplifier is an electronic device which increases the input signal's voltage, current, or power. What is the gain of instrumentational amplifier? Feedback factor = Feedback signal/input signal. Mention the need and advantage of Instrumentational amplifier? Question 42. For The Cmrr To Be Infinite What Will Be The Condition? Question 33. Question 7. It is called operational amplifier because it is used for performing different functions like differentiation, addition, integration, subtraction. Easier Gain Adjustment: Apart from a finite and stable gain, variation in the gain factor over a prescribed range of … It is called high gain differential circuit because the difference of the two input is amplified. In negative feedback amplifiers it is the negative product of loop gain and feedback factor. If we give the sinusoidal input in integrator we will get the output of integrator as a ramp output. At high frequencies internal feedback capacitance’s comes into picture. instrumentation amplifiers commonly known as INAMPS are differantial amplifiers having high input impedane, low output impedance. Question 11. Explain why an ordinary junction transistor is called bipolar? Instrumentation are commonly used in industrial test and measurement application. What is an instrumentation amplifier? The coupling capacitor blocks DC signal propagation across the amplifier and allows only AC signals. How will you test IC741 for proper working? Why slew rate is not infinite in Ideal op-amp? The typical Darlington pair is shown below, Following are some of the characteristic parameters of Darlington pair. Explain What Is An Inverting Amplifier? AC Millivoltmeter (2) Audio Systems (11) Basic Electronics (14) Bioelectric Amplifiers (5) Bioinformatics (12) Biomedical Instrumentation (71) Biotelemetry system (5) Bridges (12) ... 8085 Microprocessor Lab Viva Questions With Answers 1. 3. Why Opamp Called Operational Amplifier? 5. Engineering Electronics ECE Electrical EEE FAQs Measurements and Instruments Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF Download 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. where Ad (differential gain) = -gm*Rc, Acm (common mode gain of each stage)= -Rc/(2*Re) and the overall common mode gain of differential amplifier will be double of Acm. Explain What Is A Differential Amplifier? Explain What Is An Operational Amplifier? Such amplifiers are called cascade amplifiers. The main function of this amplifier is to diminish surplus noise that is chosen by the circuit. This website uses cookies to improve your experience. Question 26. Question 5. ... Bridges in Electronic Instrumentation can be classified as DC bridges and AC bridges. It is also known as the quiescent or Q-point. Darlington pair is a better buffer compared to single stage emitter follower circuit. Question: 2Q- The Output Of A Pressure Sensitive Transducer Requires The Use Of An Instrumentation Amplifier When A 10 MV Signal Is Contaminated By A 1.3 V Common-mode Noise Voltage Which Is Amplified In Differential Mode By An Instrumentation Amplifier. If the feedback resistor in Q15 (above question) is open, the voltage gain ……. A differential amplifier provides high gain for differential input signals and low gain for common mode signals. The MOSFET differential amplifier provides high input resistance but less gain compared to differential amplifiers implemented using BJT’s. 2. In this condition it is known as perfect balance. A capacitive coupling is one in which the output of one stage of amplifier is connected to the input of second stage through a capacitor. Name two advantages of a Wheatstone bridge over an ordinary ohmmeter. Question 24. Removal of bypass capacitor in a CE amplifier circuit causes excessive degeneration in the amplifier circuit and therefore reduction in voltage gain. Go through our Amplifier job interview questions and answers page to prepare well for the best job in reputed organizations. CMRR is defined as the ratio of differential voltage gain to common-mode voltage gain and it is given as CMRR = Ad/Acm. Explain Why Open-loop Op-amp Configurations Are Not Used In Linear Applications? A …, Bipolar Junction Transistors Questions & Answers…, 1. the gain of inamps are also very high. Explain What Are The Main Purposes For Which A Common-collector Amplifier May Be Used? 69. By choosing the appropriate turns ratio a transformer can be used to provide impedance matching with the load. The differential amplifier implemented using BJT’s are shown below, The resistance in the emitter lead plays a crucial role in the functioning of differential amplifier. Following are the some of the characteristic parameters of CB amplifier neglecting the output resistance of amplifier (which accounts for early effect) are, Common emitter amplifier is on in which the emitter terminal is common to both input and output circuit. What are the types of coupling used in amplifiers? There are mainly three types of coupling which are. If we give the sinusoidal input in differentiator we will get the output of differentiator as a square output. It has infinite voltage gain, infinite slew rate, infinite input impedance, zero output impedance, infinite bandwidth. It is shown in the figure below. VIVA QUESTIONS: 1. The Miller’s theorem establishes that in a linear circuit, if there exists a branch with impedance Z, connecting two nodes with nodal voltages V1 and V2, we can replace this branch by two branches connecting corresponding nodes to ground by impedances Z/(1-K) and K*Z/(K-1) where K = V2/V1. 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. List The Parameters That Should Be Considered For Ac And Dc Applications? Explain What Is A Voltage Follower? Types, Advantages, Disadvantages. This makes the circuit analysis and design simplified and each stage can be considered as isolated as far as DC signals are considered. The band width, in a feedback amplifier. Accept Read More, 1. Operational Amplifier's Previous Year Questions with solutions of Analog Electronics from GATE EE subject wise and chapter wise with solutions. Its low input resistance finds application in specific areas where the signal strengths are very low (or) when load on source should be very low. Answer: An instrumentation amplifier is a differential op-amp circuit providing high input impedances with ease of gain adjustment by varying a single resistor. Explain What Is An Adder Or Summing Amplifier? 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. Explain what is a dc power supply? Question 13. Explain what is a rectifier? Introduction of Transformer makes the amplifier bulkier and costly. The upper cut-off frequency of n interacting stages with each stage having upper cut-off frequencies fh is, 1/fh” = 1.1*((1/f1^2)+(1/f2^2)+……..+(1/fn^2))^(1/2). What is an op-amp? What are interacting and non-interacting cascading stages? If N1, N2 and Z1,Z2 are the turns ration and impedance of primary and secondary coil of the transformer then the primary coil impedance and secondary coil impedance are related as Z2 = Z1*(N2/N1)^2. What is an inverting amplifier? From the given circuit, Derive the CMRR of the instrumentation Amplifier, showing the… Following are the some of the characteristic amplifiers of CC amplifier are, Gv = (Rb/(Rb+Rsig))*( ro//Rl/(Rsig//Rb/(β+1))+re+(ro//Rl))). An instrumentation amplifier (InAmp) is an integrated circuit or operational amplifier topology that has high input impedance differential inputs and a low impedance single-sided output. Explain the operation of Instrumentation Amplifier; So open-loop op-amp configurations are not used in linear applications. 4. Then wisdom jobs is the best place to get started. In Explain What Way Is The Voltage Follower A Special Case Of The Non-inverting Amplifier? 73. 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. Question 16. Instrumentation amplifier using opamp. 75. Q15. The same differential amplifiers implemented using MOSFET’s is shown below. This is called the phase reversal and and causes a phase difference of 180o between the input signal and output voltage. Question 28. Cascade amplifier is a Common base amplifier stage in cascade with common emitter stage. A Transformer coupling is one in which the output stage of one amplifier is coupled to the input stage of next amplifier through a transformer. Question 30. 1. a) The CE amplifiers are used in applications where high gain is required. Question 35. Question 27. The term Coupling occurs in multi stage amplifiers and refers to the way in which the output of one stage is connected to the input of next stage. Linear: Adder, subtracter, voltage to current converter, current to voltage converters, instrumentation amplifier, analog computation, power amplifier, Integrator, differentiator etc. Define CMRR. State Assumptions Made For Analyzing Ideal Op-amp? What are the types of V/I converter? 2. What are avoidable questions in an Interview? What Is Perfect Balance In Op Amp? OPAMP it is a direct coupled high gain differential input amplifier. OPAMP is called direct coupled because the input of one OPAMP is inserted into the input of another OPAMP. Finite, Accurate and Stable Gain: Since the instrumentation amplifiers are required to amplify very low-level signals from the transducer device, high and finite gain is the basic requirement.The gain also needs to be accurate and the closed-loop gain must be stable. Question 20. An instrumentation amplifier is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment. It combines the high resistance, large Transconductance (high gain) achieved in common emitter amplifier with the superior high frequency response of common base amplifier. Give Examples Of Linear Circuits? In addition, several dif-ferent categories of instrumentation amplifiers are addressed in this guide. If in a cascade of stages the input impedance of one stage is high enough so that it will not be able to affect the output impedance of the preceding stage the stages are said to Non-interacting stages. 18: What is Instrumentation Amplifier (IA) and what are all the advantages? Explain What Are The Applications Of Integrator? 70. Differential amplifier is a combination of inverting and noninverting amplifiers and amplifies the voltage difference between input lines neither of which is grounded. 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. If a amplifier has feedback path exists from output to input then that amplifier is termed as Feedback amplifier. 3. The part of the equipment that converts ac into dc is called dc power supply. What is the difference between inverting and non inverting amplifier? Question 31. Give differential amplifier using BJT, FET? Question 37. Comparator OP AMP (operational amplifier) don’t have feedback loop. 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 the operation of Wheatstone bridge. How to Convert Your Internship into a Full Time Job? 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. a) CB amplifiers have better frequency response than CE amplifier. Such coupling is used in high frequency amplification. IN-AMPS vs. OP AMPS: WHAT ARE THE DIFFERENCES? Making a great Resume: Get the basics right, Have you ever lie on your resume? 4. All of the following are basic op-amp input modes of operation EXCEPT A. inverting mode B. common-mode What is the effect of degeneration resistance on CMMR? To meet given amplifier specifications two or more stages are cascaded in series, each stage can be identical or different. 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. Does chemistry workout in job interviews? 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. 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. 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. Instrumentation amplifiers … 3. infinite input impedance. If feedback from output to input is given in such in a way that the introduction of feedback in the amplifier increases the overall gain, then the feedback is termed as positive feedback. An instrumentation amplifier is one kind of IC (integrated circuit), mainly used for amplifying a signal.This amplifier comes under the family of the differential amplifier because it increases the disparity among two inputs. Which Opamp Don’t Have Feedback Loop? What Is The Formula For Non Inverting Amplifier? An instrumentation (or instrumentational) amplifier is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment. Alternatively in the improvised versions of differential amplifiers a constant current source is kept in emitter lead to provide very high resistance (Theoretically infinite). It is used as high frequency amplifier combined with common emitter amplifier. Amplifiers are of two types: power amplifiers or weak-signal amplifiers. Op-amp Is Used Mostly As An Integrator Than A Differentiation. Infinite slew rate. Write the equation for gain of an inverting amplifier. Question 29. Instrumentation amplifier is a kind of differential amplifier with additional input buffer stages. CMRR is defined as the ratio of differential voltage gain (Ad) to common mode voltage gain (Acm). Measurement and Instrumentation Lab - VIVA QUESTIONS. 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. What Is Characteristic Of Ideal Op Amp? Define transducer? It is used as output stage in multistage amplifier because of its low output resistance. Explain What Are The Applications Of An Inverting Amplifier? 72. 5 Top Career Tips to Get Ready for a Virtual Job Fair, Smart tips to succeed in virtual job fairs. Explain What Is An Ac Emitter Resistance? GO TO QUESTION. The main applications of amplifiers are: in wireless communications and broadcasting, audio devices etc. Looking to crack the Amplifier Job interview? Question 1. Dear sir, It is a device which converts a non electrical quantity into an … Explain Why? There is a capacitor withinor outside of an op-ampto prevent oscillation. Zero output impedance. What are the important CPU registers in the 8085 microprocessor? What is lower/upper cut-off frequency of non-interacting cascading stages? Input offset voltage may be defined as that voltage which is to be applied between the input terminals to balance the amplifier. In an inverting amplifier, the input is connected to the minus or inverting terminal of op-amp. menu ExamSIDE Questions. Some of the Advantages of negative feedback: The main disadvantage of negative feedback is decrease in overall gain. Question 21. 15. Loop gain in amplifier is defined as the gain of feedback path from output to input. Question 14. Hi, You can find print option at the bottom of the article. Voltage follower is an electronic circuits in which output voltage tracts the input voltage both in sign and magnitude. For n Non-interacting stages with each stage having lower and upper cut-off frequencies as fl, fh the upper and lower cut-off frequencies are given as follows. Question 36. 16. Explain Why Common-collector Circuit Is Known As An Emitter Follower? Electrical Measurements VIVA questions :-1. what is measurement? Analog and Digital Communication Viva Questions; Microwave Lab - Viva Questions; 8085 Microprocessor Lab - Viva Questions; Optical Communication Lab - Viva Questions 2018 (147) December (14) November (21) October (28) September (26) August (21) June (1) It is the product of loop gain and feedback factor in positive feedback amplifiers. Explain Why Does An Op-amp Have High Cmrr? Do you have employment gaps in your resume? An integrator is a circuit that performs a mathematical operation called integration. The gain and feedback factor in an amplifier are often functions of frequency, so the feedback may lead to positive feedback. It can be used as single stage or in cascade. The formula for non inverting amplifier is given as 1+Rf/R1. kindly tell ,how to save the document. What is the upper cut-off for interacting stages? Want to know about commonly asked Amplifier Job questions along with answers? It is designed to achieve wider bandwidth but dc gain approximately equal o that of common emitter amplifier. It is obvious from the expression of CMMR that increase in emitter degeneration resistance increases CMMR. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, … The addition of input buffer stages makes it easy to match (impedance matching) the amplifier with the preceding stage. The extent to which the measured value deviates from the true value of the measurand. EXPNO.1 MEASUREMENT OF RESISTANCE USING WHEATSTONE BRIDGE. Desensitivity factor is defined as the factor with which the feedback desensitizes the gain. Explain What Are Differential Gain And Common-mode Gain Of A Differential Amplifier? Briefly discuss about a transistor? a) CB amplifiers have better frequency response than CE amplifier. Infinite voltage gain. Question No. What Is The Output Differentiation And Integrator? The frequency response of the direct coupled amplifier is similar to low pass filter and is characterized by rise time. Question 15. Answer : An operational amplifier, abbreviated as op-amp, … Save my name, email, and website in this browser for the next time I comment. Solution for Attached, a figure of the famous instrumentation amplifier. It is used as high frequency amplifier combined with common emitter amplifier. increases; decreases; is not affected; depends on R i; Answer : 1 What Is Instrumentation Instrumentation Engineering? We'll assume you're ok with this, but you can opt-out if you wish. Explain What Is An Integrator? What is servo mechanisms? An instrumentation amplifier is a closed-loop gain block that has a differential input and an output that Explain What Is The Effect Of Removal Of Bypass Capacitor In A Ce Amplifier Circuit? 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. Assumptions made for analyzing ideal op-amp are: Question 3. Amplifier is a device that makes sound louder and signal level greater. Explain What Is Meant By Small Signal Amplifier? It is also called as return difference. Question 12. Q16. ... Of the four characteristics given below, which are the major requirements for an instrumentation amplifier? basically the the circuit consists of 3 opamps, two of them are voltage followers and one differantial amplifier This resistance has to be high in order that the CMMR of differential amplifier to be high. These capacitance’s introduce negative feedback from output to input which reduces the amplifier gain at high frequencies. What are the applications of transistor amplifiers? This is the most frequently used coupling. Explain What Is Meant By Phase Reversal? The process of raising the strength of a weak signal without any change in its general shape is referred to as faithful amplification. Explain What Is Transistor Biasing? Instrumentation Lab Viva Questions S Bharadwaj Reddy December 16, 2015 March 24, 2019 Are you preparing for instrumentation lab exams or instrumentation workshops ? Question 17. Question 10. 2. The process of determining the amount, degree, or capacity by comparison (direct or indirect) with the accepted standards of the system units being used. If in a cascade of stages the input impedance of one stage is low enough to act as an appreciable shunt on the output impedance of the preceding stage the output impedance of the preceding stage the stages are said to interacting stages. P. $$\,\,\,\... GATE EE 2015 Set 1. of what an instrumentation amplifier is, how it operates, and how and where to use it. Question 2. The degree of exactness (closeness) of a measurement compared to the expected (desired) value. Answer : Instrumentation engineering is the engineering specialization focused on the principle and operation of measuring instruments which are used in design and configuration of automated systems in … A certain noninverting amplifier has R i of 1 kΩ and R f of 100 kΩ. 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