hspice convergence question

[xiongshoufen]

no convergence in operating point

the FOLLOWING is hspice hint: thanks!!!!!!!!!!!!!

**diagnostic** dc convergence failure,
resetting dcon option to 1 and retrying


**diagnostic** dc convergence failure,
resetting dcon option to 2 and retrying.

no convergence with standard algorithm, trying damped pseudo-transient

**warning** negative-mos conductance = 1:mm64-xi57-xi17-xi86 iter= 7
vds,vgs,vbs = -183. -179. -184.
gm,gds,gmbs,ids= 7.95 0.393 -5.356E-02 37.1
**diagnostic** number of iteration exceeds min(7000, 20*itl1)= 4000 in pseudo
tran process (converge=1 process). Usually this happens when the
models are discontinous, or there are uninitialized bi-stable cells
(flip-flop) in the circuit. By setting options dcon=-1 and converge=-1
you can disable auto convergence process. Retry the run, non-convergence
diagnostics will provide useful information about the nodes and devices
which can be used to work around the non-convergence problems.

no convergence in damped pseudo-transient, trying gmath ramping method


**diagnostic** no convergence in gmath method gmath= 1.176E-03



**error**: no convergence in operating point





***
*** hspice diagnostic ***
nonconvergent voltage failures= 0
nonconvergent element current failures= 1

 

[Vamsi Mocherla]

hspice convergence

Exactly what type of circuit are you trying to simulate?

 

[vbhupendra]

hspice nonconvergent

set GMINDC in .options statement (but its not good idea always)

 

[paji]

hspice convergence error

open the UIC in the option.

 

[zhaoshibin]

dc convergence failure

both method mentioned above is available,you can learn more in the "the user guide of spice and spectre"