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409 Threads found on Convergence
Hi, I'm new to Verilog-A I am having convergence issues with a device I modeled in Verilog-A. When I have the device simulated in parallel with a time varying voltage source then the simulation seems to work okay. The issues arise when I try to simulate transient behaviour of my device in series with an added resistor and the voltage source in p
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 am new with using ADS and designing Rect
1. try to increase the perimeter of the patch antenna because it is inversly proportional frequency 2. check the dimensions of the radiation box 3. check the waveport dimensions 4. check the convergence 5.try to plot the currenty deinsity graph at low frewuencies and observe that any cancellation occurs
Hello All, I'm try to make a RF-DC converter, which includes some diodes. When I'm trying to match the input side for a specific power in LSSP simulation, say for 5dBm, I'm getting the following graph, 134352 I can see a sudden jump for a very small frequency change. Is there any change to be made in the 'Solver' set
Is the convergence of harmonic balance caused by the saturation of the transistor. If it was in saturation, it often takes a long time for the harmonic balance simulation. If you change the bias voltage, does it help? Have you terminate the input and output to 50 ohms?
I want to simulate 3d model in Silvaco atlas. It is a simple nwell with n+ structure and a magentic field, but when I simulate it with "solve name=anode ianode=0.001" is there a convergence and I don't know why? Can anyone please help me.... Enclosed is my code go atlas set w=54 set l=5.2 set a=3.2 set l2=2 mesh three.d x
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.
Presumably those address and sense lines go to other circuitry (unless this is a 1-bit SRAM with very arbitrary I/O). Sense amp will precharge the sense lines during read cycle, and leakage does who-knows-what in the meantime. There may be convergence-aiding conductances in the matrix that do not appear in your schematic, the simulator may add t
It sounds like a convergence issue, are you adequately meshing all three simulations? It could also be the case that there is higher than anticipated coupling between the horns which would de-tune the return loss -- can you plot the fields between them and observe coupling?
Set up the simulation domain more accurately? If you've already done this, convergence is really your only hope.
dcop: begin dcop, cpu clock= 3.04E+03 dcop: begin pseudo transient dcop: ...failed in final try dcop: end pseudo transient dcop: begin gshunt ramping dcop: gshunt = 0.1000000E-03, gmin = 0.1000000E-12, iter = 200 dcop: gshunt = 0.1000000E-03, gmin = 0.9500000E-12, iter = 200 dcop: gshunt = 0
Hello,i have designed an NMOS cross coupled lc oscillator at 1.5GHz using ADS (with Vdd=1.2V ,NMOS:BSIM4 65nm W=10um ,non ideal L=3.4nH,non ideal C=3.3pF and I_bias=4mA) .When i try to use varactors instead of capacitor to see the tuning bandwidth,i get messages for no convergence ,and that loop gain isnt enough for the circuit to oscillate(the I_b
Hi, I've just obtained a trial licence for EM.CUBE Tempo antenna design software and I'm really struggling to get the solver to converge and even when it does the results are incorrect, especially S parameters, even with relatively simple geometries. I've been unable to find any reviews or comments regarding EM.CUBE on the net. Does anyone h
Try setting up a fine seed mesh, it may be convergence.
I am running PSS on Cadence Virtuoso for a wide-range Quadrature VCO. I am facing convergence issues sometimes. Sometimes it works. Do you know the reason behind these convergence issues and how to reduce/solve those?Show me log file. Can your QVCO satisfy oscillation condition surely ? Did you confirm initial t
It's the same pb. for all continuity - DC and transient - analyses: too low a GMIN option can prevent convergence (often by transistors being (driven) in off mode), whereas setting GMIN too large can create inaccuracy.
I have a problem in convergence of a circuit consists of an oscillator locked to the frequency of voltage source. I use tstab with enough values with no progress. My accuracy is "conservative". The waveform (of both steady stare and tstab) comes at the output , but non-convergence warning comes too! Have a look at the picture attached. [ATTA
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
Hello I have designed a mono helical antenna in HFSS with these settings: Solution type:Driven a Helix with these settings 126192 and "analysis" option: 126193 126194 and frequency sweep: 126196 and here is my design 126195[/AT