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CMOS inverter or BJT inverter?

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slienteyes

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bjt inverter

I would like to know why cmos inverter is popular. Why never use BJT inverter?
 

compare bjt inverter cmos

Unfortunately, none of this circuits is an inverter. I suggest reading your text books somewhat more thoroughly, particulary paying attention to transistor n and p polarities.
 

These are not inverters, one should be PMOS and the other NMOS.

The reason is that in digital circuits, we always use CMOS and not BJT because,

1) it is easier to fabricate an MOS.
2) it is cheaper to fabricate an MOS.
3) It consumes less power
4) It will not load the previous stage.
5) ...

Check any book on transistors.

Cheers
 

Thanks. I just draw it in error. Sorry

Added after 5 minutes:

why BJT inverter is a bad circuit? it is said that if bjt circuited designed for inverter, it should be one bjt transistor connected to a resistor in collector node
 

It's not a bad circuit. But for the said reasons, if we are talking of general purpose digital logic, that's mainly historical electronics. But you're free to use any available active device for an inverter in your design. There can be many reasons to use BJT.
 

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