Hello,

You WILL need the bias to avoid the cross-over distortion.
It IS an amplifier as shown.

Bertus

thank you for your answer, the bias is given byt the voltage divider as shown in the schematic, is not correctly designed? How to set it correctly?

 

Please check the number of the pin.

I ignored the pin numbers. I just looked at the schematic you drew.

 

Hello,

Read the attached PDF.

Bertus

 

Hello,

Read the attached PDF.

Bertus

thank you for your file, however as i said many times I m designing a push pull amplifier not an inverter otherwise i guess i wouldn't have the crossover distortion

 

luma as I said early try add 1K resistor between MOS sources and GND.

 

Anyway, thanks to who suggest about crossover distortion, my question is what generate it? Anyone know the theoretical reason of it?

 

luma as I said early try add 1K resistor between MOS sources and GND.

Thank you jony for your answer probably it can be a solution to avoid the distortion, from theoretical point of view this can be easily explained by the fact that the characteristic curve becomes a curve which has a shape similar to the curve of one diode. (just the shape). However my main concern is: why my original circuit create the crossdistortion? I would like to know the reason of this distortion, in order to give a motivation on why I cannot use that configuration.

 

Well the source of a crossover distortion is exactly the same as we have in BJT
http://forum.allaboutcircuits.com/t...ed-on-push-pull-amplifier.101749/#post-766570
http://reviseomatic.org/help/s-push-pull/Push Pull MOSFET Amp.php

 

thank you jony i will have a look about it after dinner thank you very much seems what i was searching

 

However as written in your post and verified in ltspice the corssover distortion should be around VDD/2 . why in my case seems not symmetrical? I mean when the Vin increases the corssover distortion seems to cut only the negative part of the wave (for low Vin) Why?