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problem with small signal analysis (pspice)

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Aziz1758

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problem with small signal analysis ( pspice )

Hello, I'm trying to analysis a bjt differential amplifier , I analyzed the Dc circuit and then I connected a Vsin source ( 30mv - 50kHz ) , but the circuit is ignoring the ac source and analyzing only the DC

FjauJK.jpg
 
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Re: problem with small signal analysis ( pspice )

You have to select transient analysis to see the effect of sine input signal. The voltage levels annotated in the schematic are only showing DC.
 

Re: problem with small signal analysis ( pspice )

You have to select transient analysis to see the effect of sine input signal. The voltage levels annotated in the schematic are only showing DC.
I've selected transient analysis & simulate ,but still the sine input is ignored !

hryRLR.jpg
 
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Re: problem with small signal analysis ( pspice )

What are you seeing in pspice window for this voltage ?
Can you attach the voltage trace image as well.
 

Re: problem with small signal analysis ( pspice )

Why do you stop the analysis already after 100nsec? What is your frequency? You should allow at least 5 periods of the signal.
 

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