Question: Two feedback amplifiers are connected in series. Each amplifier has a distortion of 20%. Determine the overall gain and the overall distortion if (a) each

Two feedback amplifiers are connected in series. Each amplifier has a distortion of 20%. Determine the overall gain and the overall distortion if (a) each amplifier has its own feedback, as shown in Fig. P10.4(a) and (b) only one feedback is applied to the cascaded amplifiers, as shown in Fig. P10.4(b). FIGURE P10.4 A 100 20% distortion As= 100 20% distortion A 100 20% distortion 0 A2 100 20% distortion B=0.1 A=0.4 β=0.1 (a) Cascaded feedback (b) Feedback on cascaded amplifiers 10.5 A feedback amplifier is to have a closed-loop gain of A「60 dB and a sensitivity of 10% to the open-loop gain A. Determine the open-loop gain with a unity feedback β = 1 solution

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The question is incomplete due to a missing diagram The figures mentioned Fig P104a and Fig P104b are required to visualize the feedback configurations for the amplifiers Hence its challenging to provide accurate calculations without this visual reference However I can offer a general approach to solving similar problems by considering fundamental concepts of feedback amplifiers General Approach to Solve Feedback Amplifier Problems Step 1 Understand Basic Concepts Before attempting to solve problems involving feedback amplifiers its crucial to understand a few key principles Openloop Gain A The gain of the amplifier without feedback Feedback Factor Determines the portion of the output which is fed back into the input Closedloop Gain Af The gain of the amplifier with feedback calculated as Af A 1 A Distortion Typically refers to the unwanted alteration of the signal Step 2 Calculate Individual Amplifier Parameters Given Distortion of individual amplifiers without feedback 20 Openloop Gain of each individual amplifier A1 A2 100 Example Calculation for Both Configurations Case a Each Amplifier Has Its Own Feedback 1 Determine Closedloop Gain for Individual Amplifier with Feedback Each amplifiers closedloop gain Af1 A 1 A needs to be calculated separately 2 Overall Gain For amplifiers connected in series multiply the closedloop gains Overall Gain Af1 times Af2 3 Calculate Distortion Reduction Feedback reduces distortion If D is the original distortion the reduction with feedback Df D 1 A 4 Overall Distortion Combined distortion would depend on the interaction of feedback and gain reduction in both amplifiers Case b Single Feedback on Cascaded Amplifiers 1 Overall Openloop Gain of Cascaded System Multiply individual openloop gains Atotal A1 times A2 100 times 100 10000 2 Overall Closedloop Gain Using the single feedback factor for the cascaded configuration ... View full answer

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