hi,
the circuit works well,but when I change the current's amplitude, it gives me the error.
how can i fix this?

 

Are you using some expressions (inside behavioral devices) in your circuit ?
Normally overflow happens when an expression returns exceptionally high value either due to exponentials used in numerator or denominator getting too low.
You need to put LIMIT on such expressions. Search for LIMIT function in pspice reference guide.

 

hi,
thanks for the fast response.
how can I see in which expressions the error occures?
what is the max\min that Pspice can do without overflowing?

 

Normally it tells in error message the name of device. If it is not telling, then the reason of overflow is something different and related to internal mattix calculations of Pspice.
You can try playing with options - GMIN (try increasing from 1e-12 to 1e-10 etc), PIVTOL, PIVREL to see if this resolves.

 

hi,
how do I change the GMIN , and what values do i try in PIVTOL and PIVREL?
(I know for GMIN i'm supposed to write .PARAM GMIN, but it gave me an error that i can't change the value of GMIN)