Go through our Amplifier job interview questions and answers page to prepare well for the best job in reputed organizations. Question 12. 73. Desensitivity factor = (dAfb/Afb)/(dA/A) = 1/(1+A*β). Explain What Is An Integrator? All of the following are basic op-amp input modes of operation EXCEPT A. inverting mode B. common-mode State Assumptions Made For Analyzing Ideal Op-amp? This website uses cookies to improve your experience. Explain What Is A Differential Amplifier? What is servo mechanisms? It is used as high frequency amplifier combined with common emitter amplifier. 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). It combines the high resistance, large Transconductance (high gain) achieved in common emitter amplifier with the superior high frequency response of common base amplifier. In negative feedback amplifiers it is the negative product of loop gain and feedback factor. Question 32. Answer : An operational amplifier, abbreviated as op-amp, … It is called high gain differential circuit because the difference of the two input is amplified. We'll assume you're ok with this, but you can opt-out if you wish. What is an op-amp? This makes the circuit analysis and design simplified and each stage can be considered as isolated as far as DC signals are considered. At high frequencies internal feedback capacitance’s comes into picture. 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. menu ExamSIDE Questions. Explain What Is An Adder Or Summing Amplifier? 5. Also it avoids the amplifiers going into DC saturation. 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. Cascade amplifier is a Common base amplifier stage in cascade with common emitter stage. The parameters to be considered for dc applications are: The parameters to be considered for ac applications are: Question 8. Why Opamp Called Operational Amplifier? ... 30. It is designed to achieve wider bandwidth but dc gain approximately equal o that of common emitter amplifier. The formula for non inverting amplifier is given as 1+Rf/R1. What are the types of V/I converter? If a amplifier has feedback path exists from output to input then that amplifier is termed as Feedback amplifier. Question 25. What Is Perfect Balance In Op Amp? The closed-loop voltage gain is ……… 100,000; 1000; 101; 100; Answer : 3. 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. What are the applications of op-amps? Accept Read More, 1. 4. 2. What is CMMR of differential amplifier using BJT? If we give the sinusoidal input in integrator we will get the output of integrator as a ramp output. Instrumentation are commonly used in industrial test and measurement application. List The Parameters That Should Be Considered For Ac And Dc Applications? What is the gain of instrumentational amplifier? 3. infinite input impedance. To meet given amplifier specifications two or more stages are cascaded in series, each stage can be identical or different. Comparator OP AMP (operational amplifier) don’t have feedback loop. Question 36. Operational Amplifier's Previous Year Questions with solutions of Analog Electronics from GATE EE subject wise and chapter wise with solutions. Why slew rate is not infinite in Ideal op-amp? a) The CE amplifiers are used in applications where high gain is required. Integrators are widely used in ramp or sweep generators, filters, analog computers etc. ... Of the four characteristics given below, which are the major requirements for an instrumentation amplifier? What is lower/upper cut-off frequency of non-interacting cascading stages? What are the important CPU registers in the 8085 microprocessor? If the feedback resistor in Q15 (above question) is open, the voltage gain ……. The degree of exactness (closeness) of a measurement compared to the expected (desired) value. A direct coupling is one in which the output of one stage of amplifier is connected to the input of second stage in such a way to allow even DC signals from one stage to another. Common base amplifier is on in which the base terminal is common to both input and output circuit. Question 28. Q16. 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. the gain of inamps are also very high. VIVA QUESTIONS: 1. Explain What Do You Mean By Operating Point? 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. Ltd. Wisdomjobs.com is one of the best job search sites in India. Desensitivity factor is defined as the factor with which the feedback desensitizes the gain. 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. An integrator is a circuit that performs a mathematical operation called integration. 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