Help with multivibrator in PSPICE

[mona:)]

Hi
i have a problem with modeling an a stable multivibrator in PSPICE(cadence) . i've done everything i could but output signal is not correct!! i mean it dose not oscillate....

 

[ronv]

Looks ok to me, but then I don't see anything.

 

[mona:)]

i think it is because i was correcting it...)

 

[mona:)]

I got it... it is because we are in isolated environment in cadence so we need sth like noise to start simulating ...
That's all...

 

[MikeMl]

Learn how to use the .IC (initial conditions) statement. Also, when modelling oscillators, it is better to suppress the initial DC bias solution.