How do I solve the input resistance of this BJT and MOSFET in series?

by dilinex   Last Updated October 20, 2019 01:25 AM - source

Question Schematic

This is a sedra-smith microelectronics excercise question for which I can not find the answer and I hoped for perhaps a solution here?

Answers 1

(not a direct answer)

I don't use the equations.

I figure it out from datasheet plots and excel as I did for the diode.

How to model a real diode 1N4148?

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Then I verified on Falstad Simulator with my parameters

Since Ri load line at BJT saturation or FET conduction has 50% factory tolerance , your choice of datasheets matters with overdrive levels.

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Then show the ON diode curves here. enter image description here

Tony Stewart Sunnyskyguy EE75
Tony Stewart Sunnyskyguy EE75
October 20, 2019 01:04 AM

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