Modeling Bipolar Junction Transistors

[@ferhatnusreturuc1809]

I think T-model is more simple than other, thank you

[@Hilinas_Lifestyle]

Thank you so much. Well explained!

[@ronfredericks6254]

Thanks for your video.

[@ahmetpehlivan5494]

You are my man 👍🏻 keep what you doing because you are good at it

[@busterzz]

What about T-Model of the pnp transistor?

[@georgiisokolov6026]

Thank you bro! The explanation is very clear. Can you also advise some books, where the transistor circuit design is good explained? I read Horowitz and Hill but its still difficult for me.

[@youssefdirani]

The best book is to buy a transistor and try it in a simple circuit yourself

[@adarshoray]

Thanks

[@Nicknamelikeyours]

Hey David re=beta*hie is wrong. The right answer is re=hie/(beta+1) . The current through E is beta+1 bigger than through the base. Logically the resistor re has to be beta+1 smaller than hie so Vbe stays the same

[@ElectronXLab]

You're absolutely right, thanks for pointing that out.

[@diliproy5279]

Thank you soo much

[@Photonface]

What frequencies are the mid frequency ranges?

[@ElectronXLab]

That's a good question, but you probably won't like my answer. It depends on your circuit needs and then selection of your external capacitors will set low frequency cut off points. High frequency cutoff points will depend more on parasitic capacitance of the BJT, so you have less control over them but the high frequency cut off will often be in the MHz range. Bottom line..mid frequency might be in kHz to 100's of kHz range but is circuit dependent.

[@stijnlagache]

Is ho (conductance, not impedance) not 0 instead of infinity for the re-model?

[@ElectronXLab]

You're right ho is an admittance, so it should go to zero in the re-model. If it was modelled as an impedance, then it would go to infinity.

[@stijnlagache]

@@ElectronXLab ok, thank you