Consider a feedback-based causal LTI system with input x(t) shown in Figure 6.41, where G(s) is the transfer function of a "loop filter" and 1/s is an integrator. The idea is to use the error e(t) to drive these, so as to make y(t) track x(t). (a) Find the transfer functions H(s) = X(s) and He(s): E(s) = X(s)* (b) Now set G(s) = 10. This is termed "proportional feedback," where the feedback is propor- tional to the error. (i) Find y(t) and e(t) for x(t) = sin 10t. (ii) How do your answers change (provide a qualitative discussion) for x(t): sin 100t? = sint and x(t): (iii) For x(t) = u(t) (unit step), find and sketch y(t) and e(t), and specify their asymptotic values as t∞. (iv) For x(t) = tu(t) (ramp starting at time zero), find the asymptotic value of the error e(t) as t → ∞. Hint: You can simply use the final value theorem in (iii). (c) Redo (b)(iv) for G(s) = 10+½½ ("proportional plus integral" feedback).
Consider a feedback-based causal LTI system with input x(t) shown in Figure 6.41, where G(s) is the transfer function of a "loop filter" and 1/s is an integrator. The idea is to use the error e(t) to drive these, so as to make y(t) track x(t). (a) Find the transfer functions H(s) = X(s) and He(s): E(s) = X(s)* (b) Now set G(s) = 10. This is termed "proportional feedback," where the feedback is propor- tional to the error. (i) Find y(t) and e(t) for x(t) = sin 10t. (ii) How do your answers change (provide a qualitative discussion) for x(t): sin 100t? = sint and x(t): (iii) For x(t) = u(t) (unit step), find and sketch y(t) and e(t), and specify their asymptotic values as t∞. (iv) For x(t) = tu(t) (ramp starting at time zero), find the asymptotic value of the error e(t) as t → ∞. Hint: You can simply use the final value theorem in (iii). (c) Redo (b)(iv) for G(s) = 10+½½ ("proportional plus integral" feedback).
Introductory Circuit Analysis (13th Edition)
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Step 1: Summarize the given information.
VIEWStep 2: Determine transfer functions.
VIEWStep 3: Determine outputs for x(t) = sin(100t).
VIEWStep 4: Determine outputs for x(t) = sin(100t).
VIEWStep 5: Determine output for step input, x(t) = u(t).
VIEWStep 6: Find asymptotic error for ramp input, x(t) = tu(t).
VIEWStep 7: Find asymptotic error for proportional plus integral feedback.
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for your answer for part b ii what happened to x(j10)? sin10t should be equal to =10/s^2+100, since its the laplace transform. i need more explaination on the y(t) answer too. how did the angle become sin? i am so confused on your answer
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