re model of BJT-page-1

Common Base (CB) configuration

So, we see that of the input port of the transistor is forward biased, so it can be replaced by forward biased p-n junction diode.

From the output characteristics

So the output port of the transistor can be replaced by current controlled control source where controlling current is Ie.

re quivalent circuit (ckt)
Or re model of BJT in CB configuration.

When IE =d.c component of emitter current

  Final equivalentre model of transistor in CB configuration (config)


 

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