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Problem with simulating a differential amplifier

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jutek

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diff amp problem

Hello

I have a problem with simulating a differential amplifier. As you can see at the picture, ac characteriscis so different than in the literature. I can't find the solution.
Screenshot comes from ltspice

regards
 

Re: diff amp problem

The way you are biasing doesn't seem right. Make sure you have right DC operation\biasing before simulating AC.
 

Re: diff amp problem

evi said:
The way you are biasing doesn't seem right. Make sure you have right DC operation\biasing before simulating AC.
Click to expand...

yeah,i had bulk connected to source not to the ground :( the beginer's fault
 

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