Multistage amplifiers. The amplification of a signal by a single amplifier may not be enough in most of the practical cases. Hence in these cases, two or more amplifiers are used in series to get sufficient amplified signal. The amplifiers are coupled in such a manner that the output of the first stage becomes the input for the next stage. Connecting the amplifiers in this manner is known as cascading the stages.
When a number of amplifiers are connected in cascade, the overall voltage gain is equal to the product of voltage gain of individual stages.
In general the output terminals of one stage cannot be connected directly to the input of the next stage. A suitable coupling network is required to connect two stages. This coupling network should not permit the dc voltage at the output of one stage to pass into the input of the next stage. Otherwise the biasing condition of the second stage will be upset. Further the loss of voltage, when the signal passes from one stage to the next must be minimum.
The three coupling devices generally used are. RC coupling scheme consist of a series capacitor C and a parallel resistor R. C acts as a short circuit for ac signals while it behaves like an open circuit for dc signals.
In transformer coupling scheme, the transformer ensures that the ac signal is transformed from the amplifier to the load, while at the same time, insulating the load from the dc signals. When dc signals have to be amplified, direct coupling is the simplest and the best to use.
Developed by Therithal info, Chennai. Toggle navigation BrainKart. Home Physics Physics Multistage amplifiers. The three coupling devices generally used are i Resistance - Capacitance RC coupling ii Transformer coupling iii Direct coupling.
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Munisha June 5, at pm. Smartzworld June 6, at pm. Pranathi ayyalaraj April 10, at am. Leave this field empty.One stage Two stages Three stages More than one stages Ans : 4.
Changes abruptly with frequency Is constant Changes uniformly with frequency None of the above Ans : 2. Amplifier level output is kept constant Amplifier frequency is held constant Generator frequency is held constant Generator output level is held constant Ans : 4. Good impedance matching Economy High efficiency None of the above Ans : 2. In an RC coupling scheme, the coupling capacitor CC must be large enough ………. To pass d.
When a multistage amplifier is to amplify d. Collector voltage is stepped up c. If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is ………. Frequency distortion Amplitude distortion Frequency as well as amplitude distortion None of the above Ans : 1.
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There is considerable power loss There is hum in the output Electrical size of coupling capacitor becomes very large None of the above Ans : 3. Step up Step down Same turn ratio None of the above Ans : 2. The total gain of a multistage amplifier is less than the product of the gains of individual stages due to …………. Power loss in the coupling device Loading effect of the next stage The use of many transistors The use of many capacitors Ans : 2. It is a simple unit Calculations become easy Human ear response is logarithmic None of the above Ans : 3.
If the power level of an amplifier reduces to half, the db gain will fall by ……. An amplifier receives 0. What is the power gain in db? The power output of an audio system is 18 W. For a person to notice an increase in the output loudness or sound intensity of the system, what must the output power be increased to?
The output of a microphone is rated at db. The reference level is 1V under specified conditions.Differential Amplifiers 2.
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Its not reliable, Noise ef Microprocessors and Microcontroller Lab viva Questions with Answers:. What is a Microprocessor? It is a CPU fabricated on a single chip, program-controlled device, which Define discrete time and digital signal. Discrete time signal is continu Define Pulse code modulation?Two transistors Three transistors One transistor None of the above Ans : 3. The maximum efficiency of transformer coupled class A power amplifier is ……………….
In class A operation, the operating point is generally located ………. At cut off point At the middle At saturation point None of the above Ans : 2.
AF amplifiers Detectors F. If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is …………… operation. If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least ………………. Maximum voltage appears across transistor Maximum current flows Maximum voltage appears across load None of the above Ans : 1.
Symmetrical Single-ended Reciprocating Differential Ans : 2. Provide easy handling Dissipate heat Facilitate connections None of the above Ans : 2. Low forward bias Less battery consumption More battery consumption None of the above Ans : 3. If the power rating of a transistor is 1W and collector current is mA, then maximum allowable collector voltage is ……….
When no signal is applied, the approximate collector efficiency of class A power amplifier is ……. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a. The output signal voltage and current of a power amplifier are 5V and mA; the values being r.
What is the power output? The maximum a. What should be the minimum power rating of the transistor used? For the same a. The class B push-pull circuit can deliver W of a.
What should be the minimum power rating of each transistor? A transformer coupled class A power amplifier has a load of O on the secondary. If the turn ratio iswhat is the value of load appearing on the primary?
Power amplifiers generally use transformer coupling because transformer permits……. Cooling of the circuit Impedance matching Distortionless output Good frequency response Ans : 2. Either power or voltage Only power Only voltage None of the above Ans : 1. Biasing the circuit Collector efficiency To keep the transformer cool None of the above Ans : 2. Keep the amplifier cool Protect from rusting Prevent induction due to stray magnetic fields None of the above Ans : 3. Burning of transistor Hum in the circuit Excessive forward voltage None of the above Ans : 2.
Gives distorted output Gives low power output Requires a transformer None of the above Ans : 1. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion. Amplitude Intermodulation Frequency None of the above Ans : 3.
Your email address will not be published. The output stage of a multistage amplifier is also called …………… Mixer stage Power stage Detector stage F stage Ans : 2 2.Spring Design projects are assigned and a due date is given.
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