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## Convergence Error |

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spectre convergence error , convergence , convergence problem , convergence transient

spectre convergence error , convergence , convergence problem , convergence transient

89 Threads found on edaboard.com: **Convergence Error**

In my experience,
Some **convergence** **error** occurs because simulator cannot find initial state.
If you give sources with VDC,
try to source (vdd & reference., etc) with rampup.
(i.e. start all sources from 0V, then ramp up to your desired value.)
for example, If vdd=3.3V, you can use vpulse or vpwl starting from 0V to 3.3V.
Regards.

Analog Circuit Design :: 07-10-2008 01:39 :: ljy4468 :: Replies: **2** :: Views: **1043**

it's the **convergence** problem.
i suggest you use the spectre as simulator to simulate switch cap circuit.

Analog Circuit Design :: 01-29-2008 03:06 :: renwl :: Replies: **8** :: Views: **3655**

I have a problem I can't solve.
Sometimes when I run long-time simulation by Spectre I need to restat the simulation from checkpoint. I did it before with SpectreS without any problem. But after I'm switched to Spectre I can't restart simulation from checkpoint. Spectre always give an **error** message about **convergence**. I don't change anything in sch

Analog Circuit Design :: 10-25-2007 07:46 :: Fom :: Replies: **0** :: Views: **1096**

As far as I know, **convergence** refers to having a solution which results in an **error** which is less than the target. In a circuit simulator, the routine is trying to solve for the node voltages while trying to make sure that algebraic sum of currents into that node is zero (Kirchoff's Current Law - KCL). Instead of zero, a small number is usually tak

Elementary Electronic Questions :: 07-09-2007 01:26 :: v_c :: Replies: **2** :: Views: **1139**

Hi People,
I'm running a simulation for a optical circuit design which consist of a Limiting amplifier and a common mode feedback circuit. I'm facing a problem in cadence
simulation, that is while running transient simulation it is giving the **convergence**
**error** as in the attachment. This **error** only come when i run at -40 deg and not in (...)

Analog Circuit Design :: 07-05-2007 03:52 :: suria3 :: Replies: **3** :: Views: **1086**

Hi People,
I'm running a simulation for a optical circuit design which consist of a Limiting amplifier and a common mode feedback circuit. I'm facing a problem in cadence
simulation, that is while running transient simulation it is giving the **convergence**
**error** as in the attachment. This **error** only come when i run at -40 deg and not in (...)

Analog Circuit Design :: 07-05-2007 03:50 :: suria3 :: Replies: **7** :: Views: **1399**

Hello,
Has anybody worked in PSpice on SG3525?
I am getting a **convergence** **error**.
How do I overcome this?
bimbla.

Electromagnetic Design and Simulation :: 03-08-2007 10:23 :: bimbla :: Replies: **1** :: Views: **4758**

Hi I am using an ideal op amp in inverting configuration as shown in figure (in pspice). The output fails to converge when i increase the value of feedback resistor (R2) above 14.5 KOhms
The simulator gives the following **error**:
**error** -- **convergence** problem in transient analysis at Time = 708.8E-06
Time step = 582.1E-18, (...)

Elementary Electronic Questions :: 12-31-2006 02:51 :: saad :: Replies: **7** :: Views: **7029**

does dc converge?
AC has no **convergence** problem

Analog Circuit Design :: 10-11-2006 03:51 :: renwl :: Replies: **8** :: Views: **2176**

Hi,
I have a peculiar case.
I need some CMOS circuits which are facing **convergence** problems during Spectre simulation.
Some generic blocks like Switching regulators do give some **convergence** problems during simulation. Can anybody give me the schematic of such circuits which are facing **convergence** problems.
thanks
sarfraz

Analog Circuit Design :: 10-07-2006 05:42 :: shaikhsarfraz :: Replies: **4** :: Views: **1331**

for **convergence** **error**, you should first check your circuit, then add some option to help **convergence**. sometimes different hspice version can solve it. lucky!

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 09-15-2006 11:04 :: mists :: Replies: **10** :: Views: **6588**

Hello,
I am working on a DC-DC converter. I am using cadence spectre for simulations. My transient analysis is simulating fine but the DC analysis is giving an **error** saying
No DC Solution(No **convergence**)
Can anybody help me how to overcome this.
Thanks
Kasi

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 08-22-2006 13:32 :: chviswanadh :: Replies: **6** :: Views: **3120**

Hi,
1. Check if the port plane is aligned with the coax face and that there is no gap between them.
2. On the transient solver "specials" menu check the box called: "Add electric shielding around port region".
3. Another reason could be your mesh settings. Try to do a little mesh study and see what are the optimal mesh settings in which you ge

Electromagnetic Design and Simulation :: 12-08-2007 14:46 :: Pushhead :: Replies: **7** :: Views: **5928**

sometims when you choose very low values HSPICE **convergence** problems happend and some values in its iterations went out of its precision and run time **error** is shown

Analog Circuit Design :: 07-04-2006 01:48 :: mkhafaji :: Replies: **6** :: Views: **1342**

There should be a topology problems that influences the **convergence** of the simulation such as high impedance nodes with ver small capacitors, differential floating lines, branch loops etc.
It should be increase the harmonic number instead of decreasing to simulator be converged.
There may be numbers of problem that distirb **convergence** efficie

RF, Microwave, Antennas and Optics :: 06-18-2006 11:50 :: BigBoss :: Replies: **3** :: Views: **2220**

I'm trying to simulate a circuit in simulink. It was working fine upto a certain point. But after adding a mutual inducatnce element I get the following **error**.
**error** using ==> svd
NaN or Inf prevents **convergence**.
The circuit is complete and the **error** comes no matter what values for the mutual inductance are given. (...)

Software Problems, Hints and Reviews :: 04-29-2006 10:08 :: usernam :: Replies: **1** :: Views: **5471**

What results are you looking to get from HFSS?
a) Be sure to check the current distribution. Se my posts in:
b) Do a **convergence** analysis by comparing s-parameters of runs with decreasing Delta-S **error** tolerance AND port **error** tolerance (if using wave ports). Do this in MWO als

Electromagnetic Design and Simulation :: 04-26-2006 13:12 :: madengr :: Replies: **1** :: Views: **3825**

Hi, guys.
I have a question about HFSS eigen-analysis **convergence**.
For my analyzed structure, since I used Master-Slave boundary condition, it seems the frequency **convergence** is pretty poor.
Some time it reaches theoretical value in one pass but divergence to a weired number in the next one....
So are there any good methods to improve

Electromagnetic Design and Simulation :: 03-20-2006 20:06 :: jayleung :: Replies: **5** :: Views: **2795**

****error**** no **convergence** in operating point
***
*** hspice diagnostic ***
nonconvergent voltage failures= 0
nonconvergent element current failures= 1
in such case,how shall I tackle?

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 03-10-2006 01:31 :: asic_ant :: Replies: **1** :: Views: **1035**

Looks like a problem with the MOSFETs -- which are modeled being modeled by the subcircuits (.subckt) definitions.
Try the following in your simulation
.OPTIONS ITL1=400
This is the number of iterations the simulator will perform before giving up.
Let me know what happens.
Without seeing your schematic, my guess is that y

Analog Circuit Design :: 02-07-2006 21:08 :: v_c :: Replies: **6** :: Views: **29533**

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