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What is the reverse beta of BJT?

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moyu82

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Hi all,

I have some questions about reverse beta of BJT.

What is the reverse beta?

I don't know well, it's simply used for changed position.

For example, voltage is applied at emitter and ground is connected at collector.

At that time, beta is reverse beta.

Is it correct?

In addition, have you ever seen any BJT specs including reverse beta spec?

Please answer to me. Thank you
 

Re: Reverse beta of BJT

Hi,

Reverse beta is ratio of emitter current to base current in inverse-active region (collector-base junction forward biased and the emitter-base junction reverse biased).

So if transistor operates in forward-active region and you interchange collector and emitter connections, it'll probably operate in reverse-active region.

I've not seen reverse beta in specs. But this parameter can be used in model of BJT.
 
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Re: Reverse beta of BJT

Yes, BR (reversed beta) is a parameter in the commonly used BJT SPICE model (based on Gummel-Poon), the default value is 1. The parameter plays a role in the description of saturated operation. Gummel
 
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