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According to Millers Theorem, 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 kΩThe question was asked at a job interview.I'm obligated to ask this question of Frequency Response in division Frequency Response of Electronic Devices & Circuits

Answer» CORRECT option is (d) 5.75 kΩ

Easiest explanation: To CALCULATE theimpedance 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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