Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

hspice no convergence

Status
Not open for further replies.

tofu

Newbie level 5
Joined
Aug 16, 2006
Messages
8
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,358
no convergence in operating point

I'm running transient in hspice and unable to get the circuit to converge.

==================================================
**warning** Due to a floating point overflow problem,
the damped pseudo-tran method was used.
Also, gmindc was set to 1.0000E-11

**diagnostic** time step too small in pseudo tran. delta= 8.8818E-19

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


**diagnostic** no convergence in gmath method gmath= 0.00

**diagnostic** begin gshunt ramping
**diagnostic** time step too small in pseudo tran. delta= 5.8208E-19
**diagnostic** time step too small in pseudo tran. delta= 4.2333E-19
**diagnostic** time step too small in pseudo tran. delta= 3.0043E-19
**diagnostic** time step too small in pseudo tran. delta= 2.6234E-19
**diagnostic** time step too small in pseudo tran. delta= 9.8683E-19
**diagnostic** time step too small in pseudo tran. delta= 9.5827E-19
**diagnostic** time step too small in pseudo tran. delta= 9.4461E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3792E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3461E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3296E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3214E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3173E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3153E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3142E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3137E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3135E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3134E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3133E-19

**diagnostic** although this circuit has failed to converge
to gshunt= 0.00 , it did converge to a gshunt= 1.000E-03

**error** no convergence in operating point

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

Here's my TRAN section :
==================================================
.TRAN 1.00000E-10 14.00000E-08 START= 0.0000
.TEMP 25.0000
.OP
.save
.OPTION WL post probe opts ACCT
+ PROBE=0
+ DELMAX = 1.00000E-09
==================================================

I tried RELTOL=.01 ALTINT=1 and other options but none of them seem to work.
What else is worth trying?

Any help is appreciated. :D
 

no convergence in operating point hspice

deleet ACCT and DELMAX
add accurate=1 method=gear
maybe it can pass.
 

gshunt ramping failed

try increasing ur run time to some microsecs.
 

no covergence in operating

thanks for the replies but none of the helps. ;\
 

**error** no convergence in operating point

check your circuit first to be sure correct connections.
 

no convergence in operating point

Is your circuit working with a very short time pulses or expeted very high slew/rates ?
 

delmax in hspice

tofu said:
I'm running transient in hspice and unable to get the circuit to converge.

==================================================
**warning** Due to a floating point overflow problem,
the damped pseudo-tran method was used.
Also, gmindc was set to 1.0000E-11

**diagnostic** time step too small in pseudo tran. delta= 8.8818E-19

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


**diagnostic** no convergence in gmath method gmath= 0.00

**diagnostic** begin gshunt ramping
**diagnostic** time step too small in pseudo tran. delta= 5.8208E-19
**diagnostic** time step too small in pseudo tran. delta= 4.2333E-19
**diagnostic** time step too small in pseudo tran. delta= 3.0043E-19
**diagnostic** time step too small in pseudo tran. delta= 2.6234E-19
**diagnostic** time step too small in pseudo tran. delta= 9.8683E-19
**diagnostic** time step too small in pseudo tran. delta= 9.5827E-19
**diagnostic** time step too small in pseudo tran. delta= 9.4461E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3792E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3461E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3296E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3214E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3173E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3153E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3142E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3137E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3135E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3134E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3133E-19

**diagnostic** although this circuit has failed to converge
to gshunt= 0.00 , it did converge to a gshunt= 1.000E-03

**error** no convergence in operating point

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

Here's my TRAN section :
==================================================
.TRAN 1.00000E-10 14.00000E-08 START= 0.0000
.TEMP 25.0000
.OP
.save
.OPTION WL post probe opts ACCT
+ PROBE=0
+ DELMAX = 1.00000E-09
==================================================

I tried RELTOL=.01 ALTINT=1 and other options but none of them seem to work.
What else is worth trying?

Any help is appreciated. :D

change the algrithem.
 

no convergence in operating point +hspice

try using the following .options

I didnt have time to pick out the options. But just use this in ur sim and let me know if u still have probs.

.OP ALL
.OPTION ACCT NODE OPTS LIST LIMTIM=50
+ GMIN=1.00E-12 RELTOL=0.01 ABSTOL=1.00E-12
+ VNTOL=1.00E-06 TRTOL=7.00E+00
+ ITL1=400 ITL2=100 ITL4=100 ITL6=100
+ LVLTIM=2.00E+00 TNOM=+2.50E+01 LIMPTS=99999
+ CHGTOL=1.00E-14
+ MAXORD= .20E+01
+ METHOD=GEAR
+ DELMAX= .00E+00
+ POST
+ CONVERGE=1

Added after 1 minutes:

take out ITL6 = 100, if it is not identified by ur simulator. It depends on the version of hspice u r using.


gud luck
 

Re: no convergence in operating point

tofu said:
I'm running transient in hspice and unable to get the circuit to converge.

==================================================
**warning** Due to a floating point overflow problem,
the damped pseudo-tran method was used.
Also, gmindc was set to 1.0000E-11

**diagnostic** time step too small in pseudo tran. delta= 8.8818E-19

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


**diagnostic** no convergence in gmath method gmath= 0.00

**diagnostic** begin gshunt ramping
**diagnostic** time step too small in pseudo tran. delta= 5.8208E-19
**diagnostic** time step too small in pseudo tran. delta= 4.2333E-19
**diagnostic** time step too small in pseudo tran. delta= 3.0043E-19
**diagnostic** time step too small in pseudo tran. delta= 2.6234E-19
**diagnostic** time step too small in pseudo tran. delta= 9.8683E-19
**diagnostic** time step too small in pseudo tran. delta= 9.5827E-19
**diagnostic** time step too small in pseudo tran. delta= 9.4461E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3792E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3461E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3296E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3214E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3173E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3153E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3142E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3137E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3135E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3134E-19
**diagnostic** time step too small in pseudo tran. delta= 9.3133E-19

**diagnostic** although this circuit has failed to converge
to gshunt= 0.00 , it did converge to a gshunt= 1.000E-03

**error** no convergence in operating point

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

Here's my TRAN section :
==================================================
.TRAN 1.00000E-10 14.00000E-08 START= 0.0000
.TEMP 25.0000
.OP
.save
.OPTION WL post probe opts ACCT
+ PROBE=0
+ DELMAX = 1.00000E-09
==================================================

I tried RELTOL=.01 ALTINT=1 and other options but none of them seem to work.
What else is worth trying?

Any help is appreciated. :D
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top