If the input resistances of a summing amplifier are connected to potentiometers the individual input signals can be mixed together by varying amounts. Likewise, when the summing point is connected to the non-inverting input of the op-amp, it will produce the positive sum of the input voltages. Due to the switching times of transistor a flat top occurs in output of Class B power amplifier. These top 10 RF interview questions and answers help engineers seeking RF job to crack the interview with ease.These questions are very useful as viva questions also. This summing amp is not a great example - if you disconnect one of the inputs, the signal amplitude on the non-inverting op-amp pin doubles. Of course this is a simple example. 7. In case of class A amplifiers, the ratio of efficiency of transformer coupled amplifier to efficiency of a transformer less amplifier is . This makes MOSFETs useful for power amplifiers. Median response time is 34 minutes and may be longer for new subjects. Thanks alot for sharing your knoledge The operating frequency, 300Hz 2MHz If we make this closed-loop voltage gain equal to 2 by making RA = RB, then the output voltage VO becomes equal to the sum of all the input voltages as shown. Some viva question and answer about networking 1) What is a Link? Solista’s sound offers the highest level of musical accuracy and emotional expression. The electronic circuits which perform the mathematical operations such as logarithm and anti-logarithm (exponential) with an amplification are called as Logarithmic amplifier and Anti-Logarithmic amplifier respectively.. Kindly advise if the above summing amplifer is suitable. Fig.1 shows a three-input summing amplifier. B. Set frequency to 300 Hz. The summing amplifier can output the average of two, three or more signals. This is because the input signals are effectively isolated from each other by the “virtual earth” node at the inverting input of the op-amp. POWER ELECTRONICS LAB VIVA Questions and Answers :-Posted on by 4 Comments. It is defined as ratio of output power and input power. Mar 16, 2017. State two advantages and two disadvantages of tuned amplifiers. Summing amplifier can be constructed using non-inverting configuration. 1. Home/Labs/Viva Questions/FET FET 1.What are the comparisons and differences between a BJT and a JFET? a) CB amplifiers have better frequency response than CE amplifier. To avoid it the two transistors will normally be biased at a level that is slightly above cut-off. Which power amplifier has more efficiency? D. 39.5mV If you have a double packed oamp, just use second one as a voltage inverter, then you get a non-inverting summing amplifier. Important Questions on MOSFET-1) What is MOSFET? Nevertheless, if all the inputs have the same resistive values, then the maths involved will be a lot less. some viva question and answer about amplifier 1. 2. An op amp is an amplifier. It is the fundamental building block of analog circuit. Figure 1. At low frequency, a integrator may become unstable and break into oscillations, The input impedance decreases with decrees in frequency. Op Amp Applications as Adder or Summing Amplifier. What Are The Applications Of Integrator? These different signal sources will be combined together … General amplifier can amplify voltage or current or both, but output power. 4 thoughts on “ 100+ TOP POWER ELECTRONICS LAB VIVA Questions and Answers ” amit kumar giri says: June 21, 2016 at 7:26 pm. General amplifier can amplify voltage or current or both, but output power. State the disadvantages of LVDT? This name comes from the early days of amplifier design, when the op amp was used in analog Instrumentation Viva Questions. It includes... 1. 20.What are the limitations of the basic Integrator circuit? Define integrator. This is the Multiple Choice Questions in Operational Amplifiers from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad. So for a 2-input non-inverting summing amplifier the currents flowing into the input terminals can be defined as: If we make the two input resistances equal in value, then R1 = R2 = R. The standard equation for the voltage gain of a non-inverting summing amplifier circuit is given as: The non-inverting amplifiers closed-loop voltage gain AV is given as: 1 + RA/RB. Basically 2 types: Audio power amp and Radio power amplifier. MCQs in Summing Amplifier Circuits; MCQs in Current Boosters; MCQs in Voltage Controlled Current Sources; MCQs in Automatic Gain Control ; MCQs in Single Supply Operation; Start Practice Exam Test Questions. What is output offset voltage? __viva question and answer about networking part-1, __viva question and answer about networking part-2, Post Comments The summing amplifier below shows V1 and V2 are connected to the non-inverting input (V+) of the op-amp. Then I thought of the Summing Amplifier, or the Non-Inverting Summing Amplifier, which is shown in Figure 1. In the context of electric circuits, energy (w) is related to power by the following relationship p = vi =dw/dt Sometimes people ask how can one use a summing amplifier as an average amplifier. So if we look at our circuit that we have we can see that we have four input voltages, v sub 1 through v sub 4. Mention The Two Applications of tuned amplifiers. Also, the accuracy of this full-scale analogue output depends on voltage levels of the input bits being consistently 0V for “0” and consistently 5V for “1” as well as the accuracy of the resistance values used for the input resistors, RIN. Op Amps Quiz. Also, the op-amp gain is 2 so therefore your signal will double in size. I have a question about summing amplifer. Figure 1. Explain What Is The Effect Of Removal Of Bypass Capacitor In A Ce Amplifier Circuit? Besides the most obvious fact that the op-amps output voltage VOUT is in phase with its input, and the output voltage is the weighted sum of all its inputs which themselves are determined by their resistance ratios, the biggest advantage of the non-inverting summing amplifier is that because there is no virtual earth condition across the input terminals, its input impedance is much higher than that of the standard inverting amplifier configuration. What is an amplifier? Figure 2. The effect of collector to base capacitance of the transistor is neutralized by introducing a signal that cancels the signal coupled through collector base capacitance. The problem is to find V out in terms of the input voltages. The Summing Amplifier is another type of operational amplifier circuit configuration that is used to combine the voltages present on two or more inputs into a single output voltage. Removal of bypass capacitor in a CE amplifier circuit causes excessive degeneration in the amplifier circuit and therefore reduction in voltage gain. Next Page . Tell some characteristics of an ideal op-amp. Just follow the hints to find the right answer and learn about Amplifiers as you go. It is also known as the quiescent or Q-point. Electric Circuits Questions and Answers – The Inverting and Non-Inverting Amplifier Circuit « Prev. Please note that these amplifiers fall under non-linear applications. Electrical Engineering MCQ1 Voltage Gain and BW of Ideal Op Amp MCQ2 The output impedance of ideal op-amp […] + + --+-RA R B Rf R v L o +-vB v A i A i B i f v=0 Input impedance seen by vA: RA Input impedance seen by vB: RB vo doesn’t depend on RL, thus the output impedance is 0. Given below are Op Amp MCQ Questions focused on fundamental concepts of operational amplifier. 22. Tuned RF amplifiers but can not used as audio amplifiers due to high distortion. Thus for a 3-input non-inverting summing amplifier configuration, setting the closed-loop voltage gain to 3 will make VOUT equal to the sum of the three input voltages, V1, V2 and V3. Notify me of follow-up comments by email. Manas Sharma. 8. Solution for Design an ideal inverting summing amplifier to produce an output voltage of vo = -2(v1 + 3v/2). (, I want to Design 2-input summing amplifier using a type 741 Op-am, that will sum 3volt (peak-to-peak) + 6volt (peak-to-peak) and give 9volt(peak-to-peak). Explain why an ordinary junction transistor is called bipolar? Fortunately to overcome these errors, at least on our part, commercially available Digital-to Analogue and Analogue-to Digital devices are readily available with highly accurate resistor ladder networks already built-in. 25. If we add more input resistors to the input, each equal in value to the original input resistor, (Rin) we end up with another operational amplifier circuit called a Summing Amplifier, “summing inverter” or even a “voltage adder” circuit as shown below. Because the transistor operation is carried out by two types of charge carriers (maj… WordPress Image Lightbox. Ans The formula for non inverting amplifier is given … However, if the input resistors are of different values a “scaling summing amplifier” is produced which will output a weighted sum of the input signals. Class C - down side of Vce axis on load line. Even a small electrostatic … ANALOG ELECTRONICS VIVA & INTERVIEW QUESTIONS PROF. HITESH DHOLAKIYA Ans Slew rate is the maximum rate of change of output voltage per unit of time. 18.What are the applications of Log amplifier? Good tutorial, thanks! pls send all question Answer … Start a new Discussion 12313. However, there is more maths involed in selecting the weighted gains for each individual input at the summing junction especially if there are more than two inputs each with a different weighting factor. Olá! Viva Questions: 1. Based on mode of operation: Class A, Class B, Class AB, Class C, Class D. 5. In the above manner, the number of input signals can be given to the inverting i/p. If the inputs resistors, R 1, R 2, R 3 etc, are all equal a “unity gain inverting adder” will be made. When the difference of … I will write an article about the average of a signal in a near future. Summing amplifier is a type operational amplifier circuit which can be used to sum signals. A transistor is a current sensing device. Thank you very much, Good information in easy and understandable format. 1.36. c. 1.0. d. 0.5. You explaned inverted summing amplifier but I need a circut for none-inverting summing amplifier. It is virtually formed the differential amplifier of the input part of an operational amplifier. Integrators are widely used in ramp or sweep generators, filters, analog computers etc. State the ideal characteristics of Op-amp. The devices are also well suited to high-speed switching applications. ENGINEERING FUNDA YOUTUBE CHANNEL SSASIT, SURAT ANALOG ELECTRONICS VIVA & INTERVIEW QUESTIONS PROF. HITESH DHOLAKIYA Q-1 What do you mean by operational amplifier? 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. Q-12 What do you mean by gain band width product of an op-amp? Question: The Circuit Shown Below Represents 10 10k A Summing Amplifier Bo A Non-inverting Amplifier .CO An Inverting Amplifier .do A Difference Amplifier. Basics of Amplifiers Interview Questions . Class AB - nearer to Vce axis on load line. For this reason, summing amplifier is also called as Voltage adder since its output is the addition of voltages present at its input terminal. So what can we use summing amplifiers for, either inverting or non-inverting. The answer is simple, provided that one knows what kind of average one needs. 19.What are the limitations of the basic differentiator circuit? Where we can use Class B power amplifier? Figure 2.7 Summing amplifier. What is the main difference between general amplifier and power amplifier? The Summing Amplifier is a very flexible circuit indeed, enabling us to effectively “Add” or “Sum” (hence its name) together several individual input signals. 3. In the next tutorial about operational amplifiers, we will examine the effect of the output voltage, Vout when a signal voltage is connected to the inverting input and the non-inverting input at the same time to produce another common type of operational amplifier circuit called a Differential Amplifier which can be used to “subtract” the voltages present on its inputs. It is the ratio of the sum powers of all harmonic components to power of the fundamental frequency. What is the gain of inverting amplifier? 01: What id difference between power and energy? Try our quiz, based on the information you can find in Amplifiers Module 6 Submit your answers and see how many you get right. In the circuit below Va, Vb and Vc are input signals. It is used to provide high voltage gain and high common mode rejection ratio. This type of average is the signal average in the time domain. Op Amp Fundamentals: The Summing Amplifier By Patrick Hoppe. An amplifier is represented by the frequency response curve in Figure 2. By putting all of the resistances of the circuit above to the same value R, the op-amp will have a voltage gain of unity and an output voltage equal to the direct sum of all the input voltages as shown: The Summing Amplifier is a very flexible circuit indeed, enabling us to effectively “Add” or “Sum” (hence its name) together several individual input signals. Help in reviewing the book in preparation for your Board Exam input summing part engineering! Output is Good active region in various power amplifiers basic analog Circuits 2005/2006 8 Exercise 2.3 if you looking. Any type of wood veneer or a beautiful hand-rubbed lacquer made if the op-amps closed-loop voltage and... A Differentiation V+, then use standard non-inverting feedback gain equation to evaluate the output voltage of vo = (. Anti Log amplifiers Edit question No knows what kind of average is the ratio efficiency. 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