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The total gain of a multistage amplifier is less than the product of the gains of individual stages due to ___________
- a)Power loss in the coupling device
- b)Loading effect of the next stage
- c)The use of many transistors
- d)The use of many capacitors
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
The total gain of a multistage amplifier is less than the product of t...
Explanation:
Introduction:
A multistage amplifier is composed of multiple amplifier stages connected in cascade. Each stage amplifies the input signal, and the amplified output of one stage becomes the input for the next stage. The overall gain of a multistage amplifier is the product of the gains of each individual stage.
Reason for the total gain being less than the product of gains:
The total gain of a multistage amplifier is less than the product of the gains of individual stages due to the loading effect of the next stage.
Loading effect:
When the output of one stage is connected to the input of the next stage, the input impedance of the next stage affects the performance of the previous stage. The input impedance of the next stage acts as a load for the previous stage. This loading effect causes a decrease in the gain of the previous stage.
Explanation with an example:
Let's consider a simple two-stage amplifier with individual gains of A1 and A2. The output of the first stage is connected to the input of the second stage.
- The first stage amplifies the input signal with a gain of A1.
- But when the output of the first stage is connected to the input of the second stage, the input impedance of the second stage acts as a load for the first stage.
- This load impedance affects the performance of the first stage and causes a decrease in its gain.
- Let's say the input impedance of the second stage is Zin2. It will cause a voltage division between the output impedance of the first stage (Zout1) and Zin2, resulting in a reduced voltage at the input of the second stage.
- As a result, the overall gain of the amplifier will be less than the product of the gains of the individual stages, i.e., A1 * A2.
Conclusion:
The loading effect of the next stage is the main reason why the total gain of a multistage amplifier is less than the product of the gains of individual stages. It is essential to consider this effect when designing multistage amplifiers to ensure accurate gain calculations and proper performance.
Introduction:
A multistage amplifier is composed of multiple amplifier stages connected in cascade. Each stage amplifies the input signal, and the amplified output of one stage becomes the input for the next stage. The overall gain of a multistage amplifier is the product of the gains of each individual stage.
Reason for the total gain being less than the product of gains:
The total gain of a multistage amplifier is less than the product of the gains of individual stages due to the loading effect of the next stage.
Loading effect:
When the output of one stage is connected to the input of the next stage, the input impedance of the next stage affects the performance of the previous stage. The input impedance of the next stage acts as a load for the previous stage. This loading effect causes a decrease in the gain of the previous stage.
Explanation with an example:
Let's consider a simple two-stage amplifier with individual gains of A1 and A2. The output of the first stage is connected to the input of the second stage.
- The first stage amplifies the input signal with a gain of A1.
- But when the output of the first stage is connected to the input of the second stage, the input impedance of the second stage acts as a load for the first stage.
- This load impedance affects the performance of the first stage and causes a decrease in its gain.
- Let's say the input impedance of the second stage is Zin2. It will cause a voltage division between the output impedance of the first stage (Zout1) and Zin2, resulting in a reduced voltage at the input of the second stage.
- As a result, the overall gain of the amplifier will be less than the product of the gains of the individual stages, i.e., A1 * A2.
Conclusion:
The loading effect of the next stage is the main reason why the total gain of a multistage amplifier is less than the product of the gains of individual stages. It is essential to consider this effect when designing multistage amplifiers to ensure accurate gain calculations and proper performance.
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Community Answer
The total gain of a multistage amplifier is less than the product of t...
The output of first amplifier stage is the input to next stage. In this way overall voltage gain can be increased, when number of amplifier stage is used in succession, it is called a multistage amplifier. The load of first amplifier is the input resistance of the second amplifier. Thus overall gain is reduced.
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The total gain of a multistage amplifier is less than the product of the gains of individual stages due to ___________a)Power loss in the coupling deviceb)Loading effect of the next stagec)The use of many transistorsd)The use of many capacitorsCorrect answer is option 'B'. Can you explain this answer?
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