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89 Threads found on Convergence Error
I see a series stack of caps and MOS gates that has no DC path to ground in several spots (unless your MOSFET model has gate tunneling leakage, which is not that likely). Now I have no idea about ADS harmonic balance simulation but you might check whether it's using a good DC (OP) solution, or has tried to make its own and perhaps ignores the set
Hi everyone, I am trying to do rectenna at 1.9 Ghz with ADS, in rectifier part, i am taking "No convergence" error which is attached in figure 1, and my circuit also added in figure 2. Here is my questions; 1. What is this convergence error in ADS? What does it mean? 2. How can i fix this error? ps. I (...)
Did you try to change some time related parameters of the Simulation Options panel for transient analysis ? There you can select simulation optimized either to better convergence or better accuracy, or even manually change to another value higher than default.
Something is not converging but information you gave just tells this nothing more. So I can't pin down what exactly is problematic. A very easy way out of DC convergence issues, if you are using an unknown model, is assigning initial conditions for your circuit. It's probable that the model you are using has open circuits at initial step so those
Hi, I'm trying to simulate a ring oscillator with variation block on its parameters in hspice, but I get " no convergence in dc sweep curves" errors, I tried some convergence solutions, but no success. These are the codes & results: V1 vdd 0 0.9V V2 vss 0 0V .PARAM bias=1m MN11 vss 15 11 vss N1 L=120n W=280n x=-7000u y=2000u MP11 vdd
Hello dear guys and dear ladies; I am getting convergence error whil using FDTD method in FEKO. When I searched in the internet I reached very theoratical explanations and I am not numerical mathematic expert, just using FEKO. Can you explain me what is convergence in FDTD method ? Why may I be getting this error ? What (...)
Not sure if this will solve your problem, but I have fixed errors of convergence by using models for non-ideal components, including the simplest, like resistors, capacitors, etc...
i am trying to simulate an OSC including Extended Gaussian Disorder Model (or equivalently pasveer mobility model) in silvaco, but the solution doesn't converge (it had this warnings and errors: "error string found in output", "Newton algorithm did not converge in 5 iterations.","Bias step cut back more than 4 times. Cannot trap."). i tried to sol
IO_STM DRVL 0 DRVH 0 DtoA1 DtoA_STM DtoA2 DtoA_STM DtoA3 DtoA_STM DtoA4 DtoA_STM TPWRT 100.000000E+03 error -- convergence problem in transient bias point calculation Last node voltages tried were: NODE
hello, I have implemented the circuit shown in the image attached with this post. When i run the circuit it gives me and error i.e. "error -- convergence problem in transient bias point calculation". The simulation window shows these messages: **** 04/18/15 12:56:13 ****** PSpice Lite (October 2012) ****** ID# 10813 **** ** Profile: "S
Hello, I have tried to perform a transient noise analysis, but I received this error: error (SPECTRE-16192): No convergence achieved with the minimum time step specified. I have read the possible solutions, but I don't know how to change "cmin". Do you have any suggestion? Are there other things I can do?
I am using Agilent Advanced Design System 2011.10 for my circuit design. I am getting the "no convergence error" for my designed circuit to obtain HB2 Two tone swept power. I have used "OPTIONS" setting also. Even though I used "OPTIONS" settings also, am getting the " no convergence error". How to overcome this (...)
I am simulating a circuit using devices designed using SILVACO ATLAS in Mixed Mode. Now, there is no convergence error while finding IV Characteristics of the designed device but when I'm using that particular device in a circuit, on simulation is giving me a message in the Command Bar which states Warning: Not A Numbers found in currents.
114100 It is the circuit I am designing on Proteus it is giving the following error "too many iterations without convergence" pleasee helppp
Hello, i hae a prblem in my smulation for antenna monopole when i run this prject this anayse is ok and run is about 2 hours and fnaly he dsplay me error in cnvergence what is the solution please
I have tried a simulation in HSPICE with a circuit composed of a ring oscillator( 601 CMOS converters),but failed. The library I used is 350nm craft level. The netlist is as follows: .LIB 'D:\HSPICE_sim\SMIC35_SPICE\TD-MM35-SP-2002v5T\ASCII\ASCII\hspice\Enhanced_MS035_v0p6.lib' tt .GLOBAL VSS VDD .PARAM AEMI=0 .PARAM FEMI=1000MEG
hi I am new here and was wondering if you can help me with this error (PSPICE) **** INCLUDING **** * source PAC C_C1 GND N00143 1u R_R1 N00246 N00290 10k X_10k N00290 GND N00143 SCHEMATIC1_10k X_U1 N00143 N00246 +15 -15 N00290 uA741 .subckt SCHEMATIC1_10k 1 2 t RT_10k
Hello everyone, I am trying to write a 2x1 multiplexer using the mems switch in veriloga. But when i try to simulate the circuit i am getting errors. error (SPECTRE-11005): Matrix is singular (detected at `out'). error (SPECTRE-16080): No DC solution found (no convergence). Here is my code. `include (...)
maybe you have some convergence problems sometimes are explained in the log .don't you. check your circuits connections carefully and your pss analysis parameters and the tones you've given before.
It looks to me that the simulator is having trouble finding a solution due to convergence problems. The reason for this can be many fold.. You can try standard convergence solving routines - - consult google good luck!
There may be additional reasons for convergence problems, but the gate driver circuit is definitely wrong. The high side gate voltages must be applied between gate and source of the high side transistors, not between gate and ground.
Such circuits have always convergence errors.I have explained before in a different post:The simulators don't like uncertainties that include pulse generators,fast steeping square waves,switches,floating nodes,impacted transients etc. The circuit should be nth order (Non)Linear Time Invariant as much as possible in time and frequency domain.Otherwi
I am simulating a differential class E amplifier in candence spectre. I have included n-ports at the input lines to include the effect of PCB traces (s2p file). I have run the PSS analysis. I am getting the following errors error requirements were not satisfied because of convergence difficulties and the simulation is not working/not (...)
Hi there, I just would like to design a non inverting summer using OP27, but when I try to simulate, the error keep display GMIN step failed, source failed, too many iterations without convergence, Real time simulation failed to stop How could I solve this problem? Anyone helps me please? Thanks 98468
The spice simulator adds resistances from each node to ground to aid in convergence. The value of this resistance is 1/Gmin. Set the value of Gmin to 1e-15 or lower.
Hi people I have been trying to implement the following code which is a current mode comparator into mentor graphics ADMS tool; I have been receiving the following error: Analog DC computation aborted : no DC convergence found in this design Is there any problem with my code ? The schematic is also attached. `include "disciplines.h" module
Such error messages are-generally-result of convergence problems which come from frequently semiconductor models,floating nodes,extreme component values,interlacing meshes etc. In your case, using multiplier is not really lovely for transient simulator because this component is behavioural one and math. expressions in it can create some (...)
Only the timestep too small error needs your attention. It indicates an "everydays" SPICE convergence problem. Some hints can be found in the Proteus help. In general, you need to tune the simulator options respectively interactive simulation SPICE options.
As you increase the frequency, the number of mesh cells increases. That might be why you are able to solve at 6 GHz, but not at 8.7 GHz. 1. You can change the Maximum Delta S that is acceptable. Sometimes changing it from 0.02 (default) to 0.05 might lead to lesser number of adaptive passes before convergence (and generally a coarser mesh). 2. If
i am trying to simulate thyristor and for back snaping i m using curvetrace statement but i m getting error after the mincur value and error is Warning: Solution algorithm cannot reduce residual(s). Warning: convergence problem. Take smaller bias step. error: Tracer unable to project past last solution. (...)
I have to write a behavioral model for device. There is, say for example 3 external node(IO) and one Internal node. When i run the model with Spectre, there is a convergence error as the tool was not able to compute the DC operating point. So I am trying to set initial condition on the internal node. I did tried placing the assignment in @(initia
Hi I am wondering if anyone can help with how to calculate errors from CST models. Specifically using the Eigen Mode Solver and Frequency Domain Solver to calculate things like R/Q, Q, Qext and S Parameters. Is it as simple as completing a convergence study and determining the percentage error from that for the mesh you decide to work (...)
That's not true. Solver 1 is faster and would have superior convergence for most of circuits. PSpice 16.3 also has AUTOCONVERGANCE feature. Which would work for majority of circuits.
I am not sure about the specific error message you are getting but one thing that doesn't look right: Gnd GND 0 0 is invalid. I assume you mean something like: Vgnd GND 0 0 Your node "R" in the SUBCKT EIGHT_BIT_LFSR doesn't seem to be driven by anything so will cause convergence problems. I guess you intend to connect that somewhere. Keith
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
Hello forum, I am facing a problem while making a simple cct. in proteus 7,the simulation log error appears showing a message i.e too many iterations without convergence. can any one guide in detail why it happens and what does it mean? thanks
I assume you are referring the simulator option setup dialog shown, when convergence error occurs. This is turn on by default and always shown when simulation is run from pspice.
hi I am trying to simulate a 3-stage CMOS opamp using T-SPICE..during its DC analysis..m getting error msges that tell me that i need to change the value of gmin,try changing the values of absi,numns,reli,"source step smaller than minimum" i hve tried changing the values but it is still showing me errors like "it16|numns=-238978748709.must be pos
Here is Netlist: X_U1A N00316 N00312 N01666 N01473 N00559 LM2902/NS X_U1B N01328 N01062 N02764 N01595 N01286 LM2902/NS R_R1 N00320 N00312 20k TC=0,0 R_R2 0 N00316 15k TC=0,0 R_R3 0 N00320 10 TC=0,0 R_R4 N00312 N00542 20k TC=0,0 R_R5 N00320 N01062 20k TC=0,0 R_R6 N00
Sometimes HSPICE shows internal timestep error, like internal timestep is too small. It is caused by convergence problem. You can try other simulator like Spectre. Spectre's convergence is much better than HSPICE.
Hi friends, I encountered a problem while doing PA Loadpull simulation, hpeesoft demonstrated the error information as follows: A virtual resistance of 1 TOhms was added to each node. error detected by hpeesofsim during HB analysis convergence. Thank you for your answering. here is the detaied error informatin: (...)
hi all i gave my design netlist below can any one tell how to rectify this error? thanks in advances **** 05/26/11 16:40:00 ******* PSpice 16.3.0 (June 2009) ****** ID# 0 ******** ** Profile: "SCHEMATIC1-t1" [ C:\Documents and Settings\DESIGN\Desktop\proximity ic shortcircuit protection\test-PSpiceFiles\SCHEMA ****
i try to design one rail to rail MOS op-amp i use orcad for plot the circuit and then by R&H convert to hspice model my AC design have no out put and in .sp file of hspice i see **diagnostic** dc convergence failure, resetting dcon option to 1 and retrying **diagnostic** dc convergence successful you can increase the efficiency of t
Remove the .OP and add UIC to the .TRAN so you have: .tran .001n 6.00n uic It means "use initial conditions" rather than calculate the operating point. It is not uncommon for simulators to use a pseudo-transient analysis to try to solve operating point convergence problems so it may work. Keith.
Why simulators like HFSS and CST use (as a default) absolute convergence criterion not relative? I guess the last method could be more accurate because it for example can make difference between s11(n)=1, s11(n-1)=0.9 and s11(n)=0.2, s11(n-1)=0.1. In the first case relative error is 11% in the second - 200%, but absolute error is constant = (...)
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?
i am trying to generate gate pulse using SG3526. i am getting following error.What should i do???? plz help me. ** Profile: "SCHEMATIC1-456" **** CIRCUIT DESCRIPTION ****************************************************************************** ** Creatin
Hi thr, Presently I am trying to model aerodynamic effect of Wind turbine in VHDL_AMS more specifically in Mentor graphics ADvance-MS tool. All the designed got compiled successfully, but while simulating the design, I am getting following error. I tried various different ways to get rid of this problem. But the problem still persists. do you ha
Hello I am using HFSS for my PCB trace SI simulation. In my sweeps, the solver getting struck in one point at a particular interpolation error thinking that in that frequency convergence will occur. for example at freq 2.5 GHz where the interpolation error is 33%, the solver is thinking the convergence will occur at that (...)
Hello, I'm running AMS simulations with IUS (I'm currently using version 9.2.7 but I also tried earlier versions 8.2.18 and 8.2.20). I get the following error: 3P3V Supply is ramping --> BG_TOP Matrix is singular (detected at `tlk110_tb.tlk110_DUT.u_tlk110_afe.AFEBLOCKS.RX100.PGA.I1.I0.FBM' and `tlk110_t