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Q&A Small signal analysis of BJT in saturation region

The small signal analysis of a BJT when the BJT is in amplification mode: is easy.However what happens when the BJT is in saturation mode? Can we replace the dependent current source with a r...

1 answer · posted 2y ago by MissMulan‭ · edited 2y ago by MissMulan‭

Question voltage BJT resistor small-signal

#2: Post edited by

MissMulan‭ · 2022-07-18T15:40:39Z (almost 2 years ago)

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The small signal analysis of a BJT when the BJT is in amplification mode:
![](https://electrical.codidact.com/uploads/DcSpMK6kEuo6kbcs8dxBJJvc)
is easy.However what happens when the BJT is in saturation mode?
![](https://electrical.codidact.com/uploads/dCDhn8omDKAvQ8DUsXjju1Ar)
Can we replace the dependent current source with a resistor for the small signal analysis in saturation region with the value of the resistor being the inverse of the slope Ic vs Vce?(yellow line).
![](https://electrical.codidact.com/uploads/AiD2wuiRw6tdf8ZMJwLHyjeU)
~~I have searched the Internet a lot and couldnt find what I am saying in the post.Is it wrong to assume that the CE junction of a BJT when the BJT is in saturation can be replaced by a resistor?~~

The small signal analysis of a BJT when the BJT is in amplification mode:
![](https://electrical.codidact.com/uploads/DcSpMK6kEuo6kbcs8dxBJJvc)
is easy.However what happens when the BJT is in saturation mode?
![](https://electrical.codidact.com/uploads/dCDhn8omDKAvQ8DUsXjju1Ar)
Can we replace the dependent current source with a resistor for the small signal analysis in saturation region with the value of the resistor being the inverse of the slope Ic vs Vce?(yellow line).
![](https://electrical.codidact.com/uploads/AiD2wuiRw6tdf8ZMJwLHyjeU)
I have searched the Internet a lot and couldnt find what I am saying in the post.Is it wrong to assume that the CE of a BJT when the BJT is in saturation can be replaced by a resistor?

#1: Initial revision by

MissMulan‭ · 2022-07-18T01:55:05Z (almost 2 years ago)

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Small signal analysis of BJT in saturation region

The small signal analysis of a BJT when the BJT is in amplification mode:

![](https://electrical.codidact.com/uploads/DcSpMK6kEuo6kbcs8dxBJJvc)

is easy.However what happens when the BJT is in saturation mode?

![](https://electrical.codidact.com/uploads/dCDhn8omDKAvQ8DUsXjju1Ar)

Can we replace the dependent current source with a resistor for the small signal analysis in saturation region with the value of the resistor being the inverse of the slope Ic vs Vce?(yellow line).

![](https://electrical.codidact.com/uploads/AiD2wuiRw6tdf8ZMJwLHyjeU)

I have searched the Internet a lot and couldnt find what I am saying in the post.Is it wrong to assume that the CE junction of a BJT when the BJT is in saturation can be replaced by a resistor?

voltage BJT resistor small-signal

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