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According to Millers compensation and pole splitting, what is the impedance in output 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.I need to ask this question from Miller Compensation and Pole Splitting topic in section Frequency Response of Electronic Devices & Circuits

Answer»

The correct ANSWER is (b) 3.83 kΩ

Easy explanation: To calculate the impedance in output port, given I1 = 20 mA, I2 = 30 mA and Z = 2.3 kΩ:

Zin2 = (1 + α) × Z / α

α = I2 / I1 = 1.5

Zin2 = (1 + α) × Z / α = (1 + 1.5) × 2.3 / 1.5 = 3.83 kΩ.



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