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Q&A BJT common emitter amplifier equivalent circuit (π hybrid model) [closed]

Im studying the equivalent model of a BJT common emitter amplifier at high frequencies.At university we tought that the BJT at high frequencies looks something like this: However when designing ...

0 answers · posted 2y ago by MissMulan‭ · closed 2y ago by Olin Lathrop‭

Question transistor amplifier BJT

#2: Question closed by

Olin Lathrop‭ · 2022-11-08T20:50:29Z (about 2 years ago)

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#1: Initial revision by

MissMulan‭ · 2022-11-08T13:50:53Z (about 2 years ago)

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BJT common emitter amplifier equivalent circuit (π hybrid model)

Im studying the equivalent model of a BJT common emitter amplifier at high frequencies.At university we tought that the BJT at high frequencies looks something like this:

![](https://electrical.codidact.com/uploads/MAzybbLAUC9WM7AGPwrHAGAo)

However when designing a common emitter amplifier we have to take into account any base resistors .So I draw this diagram but I dont know if it is correct.Should the base resistor be before Rx or after?

![[]()](https://electrical.codidact.com/uploads/Maey9mVGDuVfCst3jBRcQNas)


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transistor amplifier BJT

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