Aug 14, 2006 #1 asic_ant Banned Joined Mar 7, 2006 Messages 50 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Location Nanjing Activity points 0 interal timestep too small **error** internal timestep too small in transient analysis time = 0.00000D+00; delta = 3.72529E-20; numnit = 304 Click to expand... I often encounter such error. How to deal with it usually?
interal timestep too small **error** internal timestep too small in transient analysis time = 0.00000D+00; delta = 3.72529E-20; numnit = 304 Click to expand... I often encounter such error. How to deal with it usually?
Aug 14, 2006 #2 J jutek Full Member level 4 Joined Oct 21, 2005 Messages 211 Helped 6 Reputation 12 Reaction score 1 Trophy points 1,298 Activity points 3,140 hspice time step hello these links should help you **broken link removed**
Sep 13, 2006 #3 S shake2004 Member level 2 Joined Feb 22, 2005 Messages 53 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,288 Activity points 1,519 spice internal timestep in my opinion,you should simulate it by using hsim before using hspice. hsim can spot out most of errors in your netlist.
spice internal timestep in my opinion,you should simulate it by using hsim before using hspice. hsim can spot out most of errors in your netlist.
Sep 15, 2006 #4 B bill_sun Member level 2 Joined Sep 24, 2005 Messages 44 Helped 3 Reputation 6 Reaction score 0 Trophy points 1,286 Activity points 1,514 timestep too small spice to check yr circuit to find the error; or put some options in Hspice to help it converge.
timestep too small spice to check yr circuit to find the error; or put some options in Hspice to help it converge.
Sep 15, 2006 #5 M mists Full Member level 5 Joined May 14, 2002 Messages 275 Helped 22 Reputation 44 Reaction score 9 Trophy points 1,298 Location China Activity points 1,281 hspice error for convergence error, you should first check your circuit, then add some option to help convergence. sometimes different hspice version can solve it. lucky!
hspice error for convergence error, you should first check your circuit, then add some option to help convergence. sometimes different hspice version can solve it. lucky!
Sep 15, 2006 #6 A abhi_4_u Junior Member level 2 Joined Sep 4, 2006 Messages 21 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 1,388 internal time step too small, hspice error Read This doc for SPICE Convergence Issues regards, Abhi
Sep 15, 2006 #7 L laglead Full Member level 5 Joined Feb 21, 2006 Messages 262 Helped 22 Reputation 44 Reaction score 8 Trophy points 1,298 Activity points 2,693 kaj spice I have a document about spice convergency. But I cannot upload. I can send to your email box.
kaj spice I have a document about spice convergency. But I cannot upload. I can send to your email box.
Sep 18, 2006 #8 J jfyan Full Member level 2 Joined May 3, 2006 Messages 145 Helped 26 Reputation 52 Reaction score 4 Trophy points 1,298 Location shanghai,china Activity points 2,064 hspice transcient time step laglead said: I have a document about spice convergency. But I cannot upload. I can send to your email box. Click to expand... hi, could you mail a copy to me. thanks jfyan@fudan.edu.cn
hspice transcient time step laglead said: I have a document about spice convergency. But I cannot upload. I can send to your email box. Click to expand... hi, could you mail a copy to me. thanks jfyan@fudan.edu.cn
Sep 18, 2006 #9 A apple_fandai Newbie level 3 Joined Sep 10, 2006 Messages 3 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,291 internal timestep too small in transient Add some initial condition for some critical node. It may help.
internal timestep too small in transient Add some initial condition for some critical node. It may help.
Sep 19, 2006 #10 P piao Full Member level 4 Joined Feb 12, 2003 Messages 221 Helped 12 Reputation 24 Reaction score 8 Trophy points 1,298 Activity points 1,517 hspice errors 1) using the ramp up supply; 2) check if there are any signals with quicker ramp rate @ the breakpoint, if there are some of this kind of signals, try to changes the ramp rate; 3)try different options.
hspice errors 1) using the ramp up supply; 2) check if there are any signals with quicker ramp rate @ the breakpoint, if there are some of this kind of signals, try to changes the ramp rate; 3)try different options.
Sep 21, 2006 #11 M manissri Full Member level 5 Joined Apr 16, 2005 Messages 281 Helped 9 Reputation 18 Reaction score 3 Trophy points 1,298 Activity points 3,279 u can fix this type of error by giving the different option like gmindc, method = gear, and cshunt ..
u can fix this type of error by giving the different option like gmindc, method = gear, and cshunt ..