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What is the impedance from the input port according to Millers compensation and pole splitting?

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What is the impedance from the input port according to Millers compensation and pole splitting?

(a) Zin1 = Z × K / 1 – K

(b) Zin1 = Z × K / 1 + K

(c) Zin1 = Z / 1 – K

(d) Zin1 = Z / 1 + K

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Enquiry is from Miller Compensation and Pole Splitting in portion Frequency Response of Electronic Devices & Circuits

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Right option is (c) Zin1 = Z / 1 – K

Explanation: According to Millers compensation, to calculate the input impedance from the input port we use: Zin1 = Z / 1 – K. Where, Z is the original circuit impedance and K is the ratio of the two nodal voltages V2 / V1.

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