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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.
Hello there! I have got this error many times trying to simulate an oscillator and I would be glad if someone could explain me what it means: I get the "timesteap is too small" error and then, this list appears: TRAN Tran1 time=(0 s->400 ns) iter = 1 RHS I= 1.916e+08 V= 8.736e
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
Hi, I am working on the design of a charging circuit, where i have to increase the transistor width to almost 5000 um for allowing the current to be 500mA, but when i increase the size of the transistor an error of this sort comes in: Gmin = 1 pS is large enough to noticeably affect the DC solution.
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.