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Q&A Find Q point in common base BJT configuration

Suppose we have this graph: How can we find the operating point (Q)?In common emitter collector we just draw a line from the vertical axis (Ic) at the point (0,VCC/RC) to the horizontal axis a...

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

Question load-line VI-characteristics

#3: Post edited by

Lorenzo Donati‭ · 2023-08-12T13:08:49Z (over 1 year ago)
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voltage current load-line

load-line VI-characteristics

#2: Post edited by

MissMulan‭ · 2022-05-31T15:29:05Z (over 2 years ago)

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Suppose we have this graph:
![](https://electrical.codidact.com/uploads/34eS35VabSgkqjSCNoXJgMGR)
How can we find the operating point (Q)?In common emitter collector we just draw a line from the vertical axis (Ic) at the point (0,VCC/RC)
to the horizontal axis at the point(VCC,0) and where that line intersects with the IC/VCE curve for some specific IB , there is our operating point but now 1)we have VCB instead of VCE and 2)VCB may take negative values.
Help appreciated!

Suppose we have this graph:
![](https://electrical.codidact.com/uploads/34eS35VabSgkqjSCNoXJgMGR)
How can we find the operating point (Q)?In common emitter collector we just draw a line from the vertical axis (Ic) at the point (0,VCC/RC)
to the horizontal axis at the point(VCC,0) and where that line intersects with the IC/VCE curve for some specific IB , there is our operating point but now 1)we have VCB instead of VCE and 2)VCB may take negative values.
Here is the circuit:
![](https://electrical.codidact.com/uploads/f47eY3h5c1bdEb8JEFMHeN74)
Help appreciated!

#1: Initial revision by

MissMulan‭ · 2022-05-31T15:00:05Z (over 2 years ago)

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Find Q point in common base BJT configuration

Suppose we have this graph:

![](https://electrical.codidact.com/uploads/34eS35VabSgkqjSCNoXJgMGR)


How can we find the operating point (Q)?In common emitter collector we just draw a line from the vertical axis (Ic) at  the point (0,VCC/RC)
to the horizontal axis at the point(VCC,0) and where that line intersects with the IC/VCE curve for some specific IB , there is our operating point but now 1)we have VCB instead of VCE and 2)VCB may take negative values.

Help appreciated!

voltage current load-line

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