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197 Threads found on Monte Carlo Analysis
hi all! I'm gonna use monte carlo analysis to find standard deviation for input Offset of a latched Comparator using icfb 5.10.41_USR5.90.69. the goal is to plot it against a voltage value called Common Mode Voltage. It is to some extent a parametric monte carlo analysis. But it seams (...)
Hi All, I have a question about the Cadence operation for the MC simulation for the BGR. Normally, we can specify a temperature and run the DC analysis of a BGR to get the historgram of Vref at this temperature. However, are we able to run the MC sim with different profiles at different temperatures at the mean time? For example, this is a measur
hi guys im looking forward a way for doing monte carlo simulation for current steering DACs . does any body know any way for doing it in cadence .
MNA-MAT, a MATLAB based analog circuit simulation tool, uses Modified Nodal analysis to reduce a SPICE netlist to a system of equations which yield voltage at and current through specific points in the network. monte carlo analysis adds further functionality by evaluating possible uncertainties in real-world working (...)
Hello, I am running cadence virtuoso 6.1.5 and trying to sort out the monte carlo analysis for process variation and mismatch. I want to plot the gain vs frequency plot of a single-ended amplifier for 10 runs i.e. I want to see the 10 gain-curves in a graph window. The only option in EVAL TYPE in OUTPUT SETUP of the (...)
I think studying the spice model in analysis process then set parameter in spice program to more practical and proper for purpose . Pspice has monte carlo analysis option , But no 3D graphics result shown .
I have designed too many op amps and none of them have any issue with a wide range variations of supply voltage , temperature , corners of process , worst case pvt circumstances , etc . but the problem is the monte carlo analysis by which my op amps are all totally devastated .I know the monte carlo (...)
Hi all, I am trying to run monte carlo analysis on a variable, from veriloga model. I had initially done the implementation with cadence-spectre flow. below is the example of how it is achieved in cadence-spectre. I put it here, so i can explain clearly what I want. 1. included the following in verilogA model for the (...)
Dear all, I am trying to run the monte carlo analysis of the offset voltage of a comparator. For this, I am using the 'cross' function from Cadence calculator. The expression I use is the following one: cross(VDC("/OUT_SF") 0.9 0 "either" t "time"), where OUT_SF is the output of my comparator and 0.9 is my threshold value. Befo
I have used Synopsys Star RC tool to obtain a .spf file. My question is how to use that .spf file in HSPICE to perform monte carlo analysis? Thank you.
I have designed a low pass filter in cadence with cutoff frequency 50Hz. However when I do a monte carlo analysis it gives mean cutoff frequency as 80Hz. How is this possible.?? All the parameters are same?? Please help me to understand this. Thanks
monte carlo analysis is a statistical analysis perfomed on the components (here Mosfets_mac). The MC analysis predict the effect of randomly varying model parameters of the Mosfets_mac , category of Mosfets. Essentially , these categories of components contains model parameters with specified tolerances.
Perhaps this tutorial can be helpful: 123718 ... in monte carlo analysis-> in analysis variation why do we have process only, mismatch only and process and mismatch. Can someone pls tell whats the actual difference. See p. 15 of the above tutorial.
Hello, As you know, PVT simulation is process, voltage and temperature. About process simulation, you can use monte carlo simulation ( samples > 10). To voltage simulation, you will change voltage supply. For example, voltage supply is 3.3 V, you can run 3.2-3.4V and may be plus Vsin (noise). To temperature simulation, you can run 0-70 celcius.
Hi, From a sensitivity analysis following a process only monte carlo analysis, I have a variance contribution report showing that the main contributions to the noise figure of a Low-noise amplifier are due to the parameters xbpos, xncjcu and xndren. I am using the IBM process BiCMOS8HP and ADEXL (Spectre RF). Any one who (...)
please provide a netlist for full adder simulation with monte carlo analysis i am using 120 nm model. i want to do threshold voltage variation how can we come to know allowable variation for a particular technology say 120 nm thank you
Hi I just need to ask how to find standard deviation of the transition points of a flash ADC using a monte carlo simulation. Say numbero f runs is 100.
Hello, I'm working with TSMC 180nm and try to run Montre Calro Mismatch simulation. I can see the parameters variation of Porcess analysis but for Mismatch analysis there is no variation in parameters. I tried to check the variation of toxnmis or other parameters variation which are defined in mismatch section, but all parameters are 0 for all i
Hai all, Can anyone get me library fies for monte carlo analysis in mentor graphics. I'm using pyxis version 10.1.
What are the tolerances on the resistors? This will play a significant role and even more with temperature changes. You may have to do a worst case or a monte carlo analysis to see this.
When I run monte carlo simulation it shows, Warning 369: COMMAND ignored: No LOT or DEV specification found ERROR 26: No analysis specified what does it mean?
Hi To me it doesnt look that you are doing a monte carlo simulation: you can see this in the toolbar "Single Run, Sweeps and Corners". This should be monte carlo analysis Then on the error you are getting, it seems you are having a network/server error. Are you running the job locally?
Hi How to apply monte-carlo simulations to find optimum size of a circuit like flip-flop in HSPICE? Thanks
Run a monte carlo analysis - if your transistor models include mismatch and/or process variance parameters - and display the delay measurement statistics ordered in your control file.
Hi, Every foundry units research on reliability phenomenons like NBTI before developing suitable models. Hence I believe that doing corner analysis and monte carlo simulations would take care of NBTI effects as well. It may not be included in Typical performace models of MOSFETs. Thanks.
I had enough trouble from the stb analysis (coming up with absurd operating points and giving way-bogus loop gain) that I gave up on it and went back to old school methods. You just can't trust it to work each and every time, like you need to ever get through your monte carlo compliance analysis.
Hello All, Please tell me how to decrease the mismatch and increase the yield of my designed Operational Amplifier, as during the monte carlo simulation for yield analysis, the open loop gain drops too large from the gain value it has been designed for. Any help would be highly appreciated. Thanks in advance.[/QUOT
It depends on the tools and PDK. Some PDK's have different transistors in the library for monte carlo simulations. In other PDK's it's an option in the transistor properties. In AdeXL you can also select which devices should be included in the monte carlo analysis.
Hi, I do monte carlo analysis to my Bandgap project, in this simulation I'm interreste in Opamp parametetrs Dc Gain,PM etc.... But as you can see on picture I have 100run but no sigmas no results no distribution. It looks like monte carlo doesnt change any parameter and do 100times same thing.I'm (...)
monte carlo analysis Histogram Today at 11:34am Quote Modify Hi All, I am designing a current conveyor and I am doing monte carlo analysis(by varying width and length of transistor) for Current gain , voltage gain and Rx,Ry & Rz. I am using code as given below: Vdd 5 0 2.5 Vss 20 0 -2.5 (...)
Hi everyone, I want to do monte carlo analysis of a circuit by varying its device width . I am writing the syntax as given below : .param W1=gauss(2.072u,0.2,1) and the using sweep monte=30 in ac analysis. Everything is fine upto this point but when I rewrite the syntax as below .param (...)
This is not required for monte carlo analysis. This is needed in worst case (.wcase) analysis, which tries to simulate worst case condition by varying the variable. HI, LO just tell the simulator which direction to go wrt nominal value.
If you have mismatch (Avt) parameters from the foundry/fab you can calculate worst case offset values for adjacent transistors, depending on their size. Or you can run a monte carlo analysis if you have the corresponding mismatch set.
Hello, I want to ask you EDA-board gurus for suggestions with HSIM Co-simulation and monte-carlo simulations. I want to run a montecarlo simulation in a relatively large transistor-level circuit (imagine a microcontroller), but the caveat is that the environment to this circuit is very complex and event-driven. (...)
Hi, I have an (H)SPICE script which compute the energy consumed by my circuit for a different set of parameters through the TRANS SWEEP statement: .tran 0.1p 600n SWEEP data=info I would like to see how the energy vary for each set of parameter while doing a monte carlo analysis. That is, if i set the parameter (...)
after the monte carlo run, say I ran only 2 runs, what are the different folders names '1' and '2' . Any idea?
Hi, I'm trying to find a reference for computing or getting a (not so) gross value for the standard deviation for effective channel length (to perform a monte carlo analysis on my circuit). Despite looking for, I couldn't find anything except it probably follows a law of the type A/sqrt(M*W*L) with A a constant depending of the process (...)
Hi, I want to do the variability analysis on my design and hence I need sigma of vth and u0 (standard deviation of threshold voltage and mobility) for monte carlo simulations. I have the 90nm PDK as well, but I dont know where these values are written. Can you please tell me how to get these values? [P.S: I can access PVT corners (fast, (...)
Good Moorning at all I'm a newbie in Cadence IC 6 and now I want to use Ocean to get a monte carlo analysis from my schematic. I've written a simple script in ocean: montecarlo(?numIters "3" ?startIter "1" ?analyisisVariation 'mismatch ?sweptParam "None" ?sweptParamVals "27" ?saveData t ?nomRun (...)
Corner analysis uses special combination sets of conditions for PVT, e.g. process=typ, V=nom and T=25°C for typ process=worst, V=nom-10%, T=85°C for ind. w.c. process=best, V=nom+10%, T=-40°C for ind. b.c. monte carlo analysis uses randomly selected condition sets in between, often selectable with limited conditions, (...)
I am working on a project "acceleration for probabilistic load flow analysis using monte carlo simulation". At distribution level bus size will be less (<500). But thousands of load flow analysis needed to be done within critical time. Which will be good solution from performance point of view. FPGA or GPU? Thanks in advance.
I'm running PSS, PAC-Rapid IP2 analysis on a frontend circuity. I can plot result through Direct Plot->Main Form -> PAC -> Rapid IP2, and I can read result directly from the plot. However, If I want to save this result, especially for a monte carlo simulation, how to do it? Thanks! So attachment. How to save data on this plot without (...)
Hi, I know somethings about worst case analysis,monte carlo analysis. I do these simulations using standard spice models available in Library. What i know is the simulation tool will vary the component parameters automatically during these analysis and gives the results. My question is , do we get (...)
Hi, I am running MC simulations on a simple single MOSFET common source amplifier. Fig 1 shows my MC analysis setup. I am getting variations in both the AC and Transient simulations (Fig 2). But I am not getting histograms for my outputs. Even after precessing the tab for "Post Processing operations for monte carlo" and opening the (...)
If you make the VT, TOX, maybe deltaL and u0 params have variable "k" factors rather than fixed numbers then you can arbitrarily mess them around; knowing what is valid and what's overkill is the trick. You might even be able to make use of gauss() and track() to do poor-boy monte carlo analysis (same concerns about validity apply, only now (...)
You run a monte-carlo analysis and look for the point where the current in the two devices is equal. It will only be approximate - it will take account of Vt and some other mismatch parameters but will not account for speed differences between the two halves. Keith. - - - Updated - - - The way to do it dyn
Did you understand the purpose of the tolerance parameter? It's only used for monte carlo statistical analysis.
The extension of the MC output file name probably is .mt0 . See the HSPICE? User Guide: Simulation and analysis, the chapter on Getting Started with Traditional monte carlo Simulations. The monte carlo PARAMETER DEFINITIONS contain the output data of a single MC run. As I don't know which graphical (...)
Hi everyone, Previously I used PSPICE for my analog/mixed-signal simulations. Recently I tried to convert my design to Cadence Virtuoso-Spectre. I have been self-studying it for a few days. It is quite different from PSPICE and it looks like powerful and complicated. Due to lack of training materials I have to google online or look at the HEP
When R2 is a function of an independent variable then the Vo is allso function of that variable. R2(t)=f(t) Vo(t)=-R2(t)/R1*Vi f(t) modulates output voltage You may want to analize your circuit in Pspice using monte carlo analysis. It will give you set of output curves for variation of R2.