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I'm trying to solve part b here, and my transfer function is coming out as -1.25s/(s^2 + 2.05s + 1 instead of the given -1.25s/(s^2 + 1.6s + 1). Since there were no initial conditions, I just transformed the capacitors to impedance 1/s and applied KCL at the node. What am I missing? My working is below as well, I can't see where the problem lies

Question

Working

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  • \$\begingroup\$ Congrats. Your math is right ;) \$\endgroup\$ – Pedro Quadros Jun 19 '15 at 10:38
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Your analysis and final transfer function are correct. Must have been a typo in the exam model answer. You can double-check by doing TF = -(feedback Z)/(input Z).

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Your anylysis of the shown circuit is correct - however, I am afraid the redrawn CIRCUIT is not correct. The given transfer function belongs to a classical bandpass in Multi-Feedback topology (MFB) - and C1 must be connected to a node between R2 and c2. In this case, we get the term 1.6s in the denominator.

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