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According to Millers compensation and pole splitting, what is the impedance in input port if I1 = 20 mA, I2 = 30 mA and Z = 2.3 kΩ?(a) 0.38 kΩ(b) 3.83 kΩ(c) 0.57 kΩ(d) 5.75 kΩI had been asked this question in a job interview.This interesting question is from Miller Compensation and Pole Splitting in section Frequency Response of Electronic Devices & Circuits |
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Answer» CORRECT answer is (d) 5.75 kΩ Explanation: To CALCULATE the impedance in input port, given I1 = 20 mA, I2 = 30 mA and Z = 2.3 kΩ: Zin1 = (1 + α) × Z α = I2 / I1 = 1.5 Zin1 = (1 + α) × Z = (1 + 1.5) × 2.3 = 5.75 kΩ. |
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