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## Poor Convergence |

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1000 Threads found on edaboard.com: **Poor Convergence**

Hello,
I am simulating a 2-18 GHz cavity backed spiral antenna in HFSS but I am getting these warnings (mentioned below) in fast sweep when I decrease the spiral arm width to anything below 0.25 mm. I have searched alot on google and HFSS guides but there is nothing on these warnings.
How can i remove this warning message and what do these war

RF, Microwave, Antennas and Optics :: 12-10-2010 06:49 :: ahsaan :: Replies: **2** :: Views: **2870**

I am getting following error in one of my simulation-
Fast sweep setup, process hf3d: **poor** **convergence** in computing port dispersion
I require help to understand the following-
1)What is port dispersion?
2)How it effects the result?
3)How to correct it?
Thanks
Abhishek

Electromagnetic Design and Simulation :: 02-27-2012 02:20 :: abhisheksarkhel :: Replies: **0** :: Views: **1278**

Hi everyone,
I met a problem when I use HFSS's Driven Terminal to simulate a structure. It is a warning, "Fast sweep setup, process hf3d: **poor** **convergence** in seeding data." My simulation setup is following,
Solution Frequency: 14.25GHz
- Adaptive Solutions
Maximum Number of: 20
Maximum Delta S: 0.02
- Adaptive Options
Maximum Refin

Electromagnetic Design and Simulation :: 10-11-2013 23:17 :: jianke :: Replies: **0** :: Views: **282**

My work is on implicit FDTD method which allows time step (delta_t) above CFL limit. Implicit methods require one to solve a large sparse matrix. If delta_t is increased the the solution of this sparse matrix becomes slower. I can see this when I do the simulation with the implicit scheme.
But my query is about mathematical explanation of what

Mathematics and Physics :: 07-23-2009 13:17 :: confi999 :: Replies: **0** :: Views: **995**

My work is on implicit FDTD method which allows time step (delta_t) above CFL limit. Implicit methods require one to solve a large sparse matrix. If delta_t is increased the the solution of this sparse matrix becomes slower. I can see this when I do the simulation with the implicit scheme.
But my query is about mathematical explanation of what h

Electromagnetic Design and Simulation :: 07-23-2009 13:35 :: confi999 :: Replies: **2** :: Views: **1049**

Fast sweep setup, process hf3d: **poor** **convergence** in computing port dispersion.
this is a warning i have some questions about:
1. what does it refer to?
2. what is "port dispersion"?
3. how can i control or determine the properties of this **convergence**?
4. to what level this error may effect my results?

Electronic Elementary Questions :: 10-24-2010 11:34 :: mac.feri :: Replies: **1** :: Views: **2452**

I am experiencing a similar problem with HFSS. I set up the simulation such that at least 5 runs converge. After a while **convergence** is achieved. Then in the subsequent 3-4 runs, the **convergence** is achieved. But suddenly at the 4th or 5th run there is an error of %98. Out of 36 runs, none of the 4 runs converged to the same value after one another.

Electromagnetic Design and Simulation :: 04-06-2006 14:48 :: irfan1 :: Replies: **5** :: Views: **1674**

Anyone knows the term of 'non-converged solutions' and 'meshing' in HFSS? What does it mean by '**poor** meshing'? How to measure how **poor** it is and then how to improve it?
Thanks so much
zahril

Electromagnetic Design and Simulation :: 06-12-2007 12:01 :: zahriladha :: Replies: **3** :: Views: **995**

hi, ansoft guies:
There is one simple question about HFSS.
Since Adaptive 'Single frequency' analysis will allow users to setup 'Requested Passes', what number will be suitable? I used 7.
However, issues come up! The results,obtained by 'Single Frequency', differs greatly from 'Sweep' analysis
results? Because of the higher acc

Electromagnetic Design and Simulation :: 01-23-2003 10:49 :: mike_bihan :: Replies: **1** :: Views: **2672**

Hi everyone
I really want to know if anybody came accross "checking for data **convergence**". I want my data passes to converge, how can I do it? Any ideas?
I appreciate your help
sally

Electromagnetic Design and Simulation :: 01-05-2004 23:29 :: ayadi :: Replies: **1** :: Views: **776**

Can any one tell some smart technics to solve convegence problems in DC or AC analysis.
I know about these options
STEPGMIN
RELTOL
ITL1
GMIN

Analog Circuit Design :: 01-16-2004 06:07 :: tyanata :: Replies: **5** :: Views: **2708**

Hi all
I need help
How to route through a copper **poor** in power pcb or blaze route ??

PCB Routing Schematic Layout software and Simulation :: 04-22-2004 10:13 :: MCMC :: Replies: **5** :: Views: **1357**

about the **convergence** message in HFSS v9.0 :()
1. why the 6th and 8th pass gave Delta S in terems of N/A? what does N/A mean?
2. it seems Delta S becomes larger when pass Numbers increasing, I don't know if it's reasonable since I feel Delta S should get smaller with increasing pass Numbers solved.
Thanks in advance!
the next is a

Electromagnetic Design and Simulation :: 05-23-2004 21:26 :: jackle :: Replies: **2** :: Views: **886**

Mathematics and Physics :: 05-24-2004 03:39 :: cedance :: Replies: **1** :: Views: **1251**

jgiardini@invap.com.ar
if you use a dense mesh the result would be **poor**er than for initial meshes
It's possible for resonanse structure calculation. Morever it's usual for
this case bacause the **convergence** is not monotonic.
Only for non-resonant structure dense mesh always corresponds better result.
Also the result strongly depen

Electromagnetic Design and Simulation :: 11-30-2004 02:00 :: navuho :: Replies: **8** :: Views: **1897**

If a receiver has **poor** channel selectivity, the interferers that are out of the channel, will be amplified by the IF amplifier and will go into the demodulator, interfering with desired signal.
In a digital system BER will be affected.
You have to check the requirements for selectivity of your system (adjacent and alternate channel selectivity).

RF, Microwave, Antennas and Optics :: 01-11-2005 13:46 :: vfone :: Replies: **10** :: Views: **1360**

Anyone is using ultrasim for 5000+ transistor simulation?
Do you encounter **convergence** problem in transient analysis?
I have tried nearly all the option, sim_mode, trtol, speed ....
and can't make it converge.
It does running at the beginning but at a centain instant, the **convergence** problem will happen?
any share is welcomed!

Analog IC Design and Layout :: 01-21-2005 04:24 :: Vitamin-C :: Replies: **1** :: Views: **1311**

Hi!
I need some information on how to solve **convergence** problems (time step too small) when I'm simulating power electronics systems which include analog parts, D latches and ABM parts. Also I have large currents and voltages to simulate at 70 kHz. I already read material from orcad's site, changed some settings in simulator and still have problem

Electronic Elementary Questions :: 01-23-2005 10:37 :: epp :: Replies: **3** :: Views: **1854**

Does anybody use ads to simulate? I have a **convergence** problem in simulate my circuit. I need help.

Analog Circuit Design :: 04-14-2005 21:33 :: liujs_825 :: Replies: **1** :: Views: **798**

Does anyone use UltraSim for PLL simulation?
DC **convergence** problem occurs when I use UltraSim to run a PLL simulation.
DC simulation can converge with Spectre simulator but can't with UltraSim.
How to solve this problem?

Software Problems, Hints and Reviews :: 04-25-2005 03:33 :: hmsheng :: Replies: **2** :: Views: **1479**

Thank you for replying !!
noiseless, qqmz !!
> noiseless
I used idal switch. Nevertheless, there were some errors at certain input voltage values as follows.
>Zero diagonal found in Jacobian at ...
AND
>The values for those nodes did not converce on the last Newton iteration are given below.
>Also given is the mann

Analog Circuit Design :: 05-27-2005 09:36 :: analogman :: Replies: **9** :: Views: **4811**

I'm a cad engineer but I have no more experience indeed, I met the question of timing **convergence** when do timing driven P&R with SE, which way should I think of and how to resilve it? Thanks for your help!
Have a good day!
Best Regards,
Harryzhu

ASIC Design Methodologies and Tools (Digital) :: 08-15-2005 06:14 :: harryzhu :: Replies: **1** :: Views: **729**

Hi coolrak:
There is yet another interesting point to **convergence**, and that is how much the simulation error changes from pass to pass as you refine your descritizations. Often, we all assume that EM simulators provide monotonic error **convergence**. That is to say that as we make the descritizations smaller and smaller, the simulation result alw

Electromagnetic Design and Simulation :: 09-09-2005 18:19 :: maxwellian :: Replies: **5** :: Views: **1813**

Hi
I'm working in a VCO design applying ELDO. As a autonomous circuit, VCO frequency is supposed by ELDO steady-state analysis, with a given initial frequency guess.
Appliying a probe between two nodes, ELDO gets an oscillation frequency. How accuracy is it?
Sometimes, oscillation steady-state analysis does not converge. How to fix this ?

Analog IC Design and Layout :: 10-01-2005 18:30 :: mazelk :: Replies: **1** :: Views: **971**

CMOS process is cheaper comparable with others (GaAs, SiGe, etc). A CMOS PA can meet in some limits the same performances with competitors.
Nobody wants to make a CMOS PA with **poor** performance. Just cheaper.

RF, Microwave, Antennas and Optics :: 10-06-2005 02:55 :: vfone :: Replies: **9** :: Views: **1390**

A model is built in ads and run. Under DC analysis is is converged, but under transient analysis it is nor converged. and the message below appeared,
Pseudo transient does not converge
Step limit exceeded.
DC analysis converged with **convergence** mode = Newton-Raphson.
Could someone tell me the possible reason and the posssible soluti

RF, Microwave, Antennas and Optics :: 11-07-2005 07:24 :: hellotxn :: Replies: **6** :: Views: **955**

Hi.
I have yet another problem with Pspice
ERROR -- **convergence** problem in bias point calculation
Last node voltages tried were:
NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE
( a0) 0.0000 ( a1) .7042 ( a2) 0.0000 ( a3) 0.0000
( a4) 0.0000 ( a5) 0.0000

Analog Circuit Design :: 02-07-2006 15:14 :: Cyrk :: Replies: **6** :: Views: **17190**

I am simulating a BGR using HSPICE.
When i am simulating .op at any specified temprature using .temp,it is doing fine.
But when i am trying to sweep the temprature, simulation is getting halt.I have tried with diffrent ranges of temprature,but the result is same.I tried with the different GMINDC and **convergence** =2,3 also ....
I am getting surpr

Analog IC Design and Layout :: 03-16-2006 00:50 :: nagag :: Replies: **7** :: Views: **2034**

can anyone tell me how to understand **convergence** control options?
how to achieve **convergence** more quickly?anyone with some experience?
Thanks

Analog Circuit Design :: 04-04-2006 11:58 :: pugongying :: Replies: **4** :: Views: **1093**

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.
Anybody know where the pro

Software Problems, Hints and Reviews :: 04-29-2006 06:08 :: usernam :: Replies: **1** :: Views: **2747**

hi,
i'm designing an integrator: OTA+capacitor
when i simulate @ a differential input, i found out with the capacitive load, the differential output is so large that the Gm drops drastically, which means the linearity is **poor**.
my questions are:
1). in general, should the output swing of OTA be limited?
2). how to simulate Gm? my method

Analog Circuit Design :: 05-10-2006 08:37 :: currentmirror2000 :: Replies: **4** :: Views: **946**

I am learning about EM Simultor. And one of the big problem often comes is :
The **convergence** problem.
Can somebody help me to understand what is it?
Thanks

Electromagnetic Design and Simulation :: 05-11-2006 12:36 :: sunnySan :: Replies: **4** :: Views: **1211**

when simulate analog circuits using Spectre, I often meet the **convergence** about spectre. for example, pss simulation, when the simulation time is 1us, the circuit is convergent; when the simulation time is 1.1us, the circuit is not convergent. what is the problem? Thanks!

Analog IC Design and Layout :: 06-04-2006 22:27 :: williamy :: Replies: **4** :: Views: **1052**

Hi, recently I am doing the simulation of patch antenna by using CST. But when I using the waveguide port for coaxial cable, there are some **convergence** problems arising:
The CST time-domain solver shows me the messege:
" The calcuation seems to be unstable! Consider reducing the value for the stability factor in the solver specials options or r

Electromagnetic Design and Simulation :: 07-04-2006 20:09 :: winglj :: Replies: **7** :: Views: **3454**

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 IC Design and Layout :: 08-22-2006 09:32 :: chviswanadh :: Replies: **6** :: Views: **1525**

When I run a simulation with hspice,it can't reach **convergence**.
In the .lis file,the hspice diagnostic provided some nodes whose tol value are bigger than 1( the actual tol values are about 500).
And I found those nodes are the power supply voltage sources and the nodes where there are input waves.
how should I deal with them?
Btw, I had ad

Analog Circuit Design :: 09-03-2006 22:37 :: Tiiu :: Replies: **4** :: Views: **856**

Hi,
Can any body forward me some documents which describes how to improve the **convergence** of SPECTRE.
thanks
sarfraz

Analog IC Design and Layout :: 09-28-2006 01:20 :: shaikhsarfraz :: Replies: **5** :: Views: **730**

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 01:42 :: shaikhsarfraz :: Replies: **4** :: Views: **825**

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 (...)

Analog Circuit Design :: 10-08-2006 04:32 :: xiongshoufen :: Replies: **4** :: Views: **4788**

i am trying to calculate small signal AC gain of a circuit in H-spice but am not able to do it as spice is giving **convergence** error. Problem is not getting solved even by using PWL in power supply VCC as then it gives some absurd value of gain please help me in solving this **convergence** problem as it regularly gives head ache during simulations
t

Analog Circuit Design :: 10-10-2006 07:56 :: engrvip :: Replies: **8** :: Views: **1316**

I want to know what happen when change .OPTIONS statement in HSPICE file to understand this problem. Anyone could give me an advice? in more details is the best.
Because It's difficult to find "**convergence** problem" in very big circuit.
Anyone met '**convergence**" errors? help me pls

Analog IC Design and Layout :: 11-21-2006 23:52 :: bicave :: Replies: **2** :: Views: **593**

Consider the interactive process
X(k+1) = 0.5 { X(k) + a/X(k)} where a >0 . Assuming that the process converges. To what does it converge ? What is the order of **convergence**?

Mathematics and Physics :: 11-27-2006 11:54 :: claudiocamera :: Replies: **1** :: Views: **521**

Hi, I need your help to find a service manual for my Panasonic HD projection tv model # PT-47WX49. The standard **convergence** is not good enough for me. I saw a service tech clean my tv and he somehow pulled up a **convergence** screen that allowed for tuning that is not in the operation manual. I asked how he did this but for job security, he did no

Service Manuals, Requests, Repair Tips :: 11-27-2006 17:23 :: DeathByMullet :: Replies: **6** :: Views: **6403**

Hey guys, I m finding this paper called
**poor** man's explanation of Kalman Filters or How I stopped worrying and learned to love matrix inversion by du Plessis, R.M., 1967
Could u guys help me to find it?
Please tell me where I can get this free. Thnx

Digital communication :: 12-07-2006 23:12 :: Mr. Grey :: Replies: **0** :: Views: **2423**

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, minimum allo

Electronic Elementary Questions :: 12-30-2006 21:51 :: saad :: Replies: **7** :: Views: **4724**

I have been using ELDO since I moved into electronic industry. I have heard that HSPICE has a lot of **convergence** problems. I have virtually seen NONE so far in using ELDO.
Has anybody found a **convergence** problem in ELDO thus far?

Analog Circuit Design :: 03-28-2007 02:13 :: srieda :: Replies: **9** :: Views: **2128**

Theory is this. I've got a **poor** batery, say 9V and its almost empty, but the voltage is still normal when unloaded. Say it's maximum current is 5 mA when shortcircuited.
And I got a beeping device* that runs on everything from 3 volts and above that. This (whatever it is) draws 50mA in order to work. The idea is that the 9V battery will provide

Other Design :: 04-03-2007 15:34 :: Prototyp_V1.0 :: Replies: **2** :: Views: **1302**

When the circuit is not converged in spice or ADS, the nodeset command could be used to help to solve the problem. I want to know whether there is a similiar commnd in spectra. Thanks in advance!

RF, Microwave, Antennas and Optics :: 04-09-2007 20:36 :: hellotxn :: Replies: **1** :: Views: **649**

I want to know about FMC (Fixed Mobile **convergence**).Can anybody help me?

Digital communication :: 04-15-2007 00:23 :: famot :: Replies: **1** :: Views: **709**

Hello,
I am looking for
Coleman, T.F. and Y. Li, "On the **convergence** of Reflective Newton Methods for Large-Scale Nonlinear Minimization Subject to Bounds," Mathematical Programming, Vol. 67, Number 2, pp. 189-224, 1994.
Anyone has it or can scan it ???
Thank you.

Mathematics and Physics :: 04-21-2007 12:04 :: hamidrezakarami :: Replies: **1** :: Views: **1650**

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