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# Monte And Carlo

292 Threads found on edaboard.com: Monte And Carlo

## Parametric Monte Carlo Analysis Cadence

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 this version cant (...)

## One question about the Monte Carlo simulation for the bandgap reference circuits

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

## Monte Carlo Mismatch and Percentage

Hi guys, After running some monte carlo simulations in a current mirror, I would like to compute the amount of mismatch in percentage. To compute the mismatch in percentage I should do it taking into account the (3 sigma * std. deviation) or just the std. deviation? For example I see people saying that the current mirror has 5% of mismatc

## MNA-MAT : An easy-to-use MATLAB tool for SPICE netlist simulation

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 conditions. The tool,

## plot waveform in cadence monte carlo analysis

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 (...)

## Microstrip patch antenna on FR4 for 2.4 GHz band

FR-4 has a lot of variation from vendor to vendor. If you can be assured that your vendor uses the same supplier of FR-4, it is fairly consistant from batch to batch. It is not the best to use for RF circuits that need good control of both the dielectric constant as well as the lost tangent. However, it IS used for RF circuits in spite of its we

## Current mirror and mismatch

Hi guys, I would like to make a small experiment regarding current mismatch in a current mirror for different transistors area (or sizes). I know that we have to do that using monte carlo (or maybe the dcmatch can work, I don't know). But the thing is how should I do the calculation to get the mismatch? and should I use any kind of (...)

It looks like you are making MC simulation with a normal lib.scs. You should add the monte-carlo lib.scs file to Model Files. You can add the mc.lib.scs file as a new corner.

## Cadence Virtuoso Monte Carlo Problem

Hi everyone, For an LNA design, the inductors used in the design were simulated in a simulation software separate from the spectre simulator used in cadence for the other components (transistors, resistors, capacitors). So we created a n-port file for the inductors in the design and made it point to the S-parameter file generated by the inducto

## monte carlo simulation problem

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 analysis (...)

## Vth Variation in Hspice

Hi! I am trying to model an Arbiter PUF in Hspice. You can google it if you don't know what that is. So I am trying to implement the delay differences in the multiplexers due to process variations. In order to do that I have to run monte carlo simulations using hspice and vary the oxide thickness and the threshold voltage of (...)

## Has anyone used BJT in TSMC65nm?

Hello, Has anyone used BJT available in TSMC65? There are pnp and npn transistors in the library and can be used. I wonder if any one has simulated monte carlo for those BJT. For MOS, one should replace "_mac" transistor and add "stat_mis" library. How about BJT? there is no "_mac" file to be replaced! (...)

## Monte-Carlo estimation of Mutual Information over AWGN channel

Hi all. I'm trying to solve a problem I was tasked with. Basically I have to generate a 100k 16QAM inputs and transmit them over a AWGN channel. With this I have to use the monte-carlo estimation to figure out the mutual information. I was told to use this estimation: 129044 So I generated the input vector, the

## Cross function and Monte Carlo analysis

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

## Cadence monte carlo simulation and "multiple" parameter

Hello, Im using Cadence 6.1.3 and Id like to do monte carlo simulation. I found out that "m" shouldnt be used in schematic or monte carlo might be errorous. source: So I decided to test it: testbench results

## is this gonna work ? Power op amp from discrete

It will likely work close to your simulation results if you follow proper design procedures such as a good layout, heat sinking, and supply decoupling, but no guarantee. If you can, do some monte carlo simulation multiple runs to see how component variations (including supply voltage variation and offset) affects the amp (...)

## [Moved]: Monte-Carlo simulation in cadence- error

Hello all, I am working on an SRAM cell for which I have to perform monte-carlo simulation. During MC simulation in ADEXL window, we found a pop up window with the following error messages after 10 min, while the 6T SRAM cell was run for 100ns for 2 samples. Please help in this matter. [Error message ADEXL-1921: failed to start new job afte

## offset simulation with Hspice for a simple comparator

Hello all After many hours searching and reading the tutorials for offset calculation, I don't know what should I do. here is my codes. please help me to complete it.I don't understand how to write codes for DCMATCH or monte carlo simulation and how to extract the information. .options post .op (...)

## [Moved]: How do I perform monte carlo simulation and MoSRA simultanously?

My file is below. I want to see the effect of aging on circuits with process variation. But I cannot append mosra and consider monte carlo sweep =3 (or any number) at the same time. Could yo please help me. Thanks Also the manual says montecarlo works only with simmode=1 but fopr that I need to first use (...)

## Monte Carlo analysis- analysis variation

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.

## [Moved again]: monte carlo simulation in hspice

Hi everyone, I have a question about hspice. I want to simulate a basic ring oscillator with variation block & monte carlo simulation in hspice, & this is my code: *CMOS Ring Oscillator V1 vdd 0 0.9V V2 vss 0 0V .subckt inv vdd vss in out Mp1 vdd in out vdd pmos l=0.35u w=20.0u Mn1 vss in out vss nmos l=0.35u w=10.0u Cload

Hi can someone pls explain to me what is PVT analysis and how to do the analysis in cadence. I understand a circuit has to be tested under different conditions say if the voltage varies, and how stable it is in varying temperature and also the same functionality is met even it some changes occur during fabrication process (...)

## [moved] How to run monte carlo from command line

Hi all Could any one show me how to run monte carlo from command line.? I do not have ADE XL simulator. Thanks

## Monte carlo Simulation for two stage ota

Hi I am designing a two stage OTA using CADENCE . Need to run monte carlo simulation for offset voltage. can somebody give me any user guide. Thanks.

What did you change as against the previous simulation? Here is the monte carlo simulation for both process and mismatch variation for a 3-bit flash ADC. What do you conclude from this plot ? Library I am using is L130E_HS12_V241_MC_CORNER.lib.scs The ADC will not work over corners, process and mismatc

## parametric analyse in monte carlo simulation

hi dear friend. i have cadence 6.1.4. how i to run parametric analyse in monte carlo simulation? Tanks

## Monte Carlo Simulation (Mismatch)

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

## Monte carlo simulation

Hello, I am trying to setup a monte-carlo simulation given a spef file. In this spef file, is modeled equations which can be solved based on the command line parameters which i want to specify as inputs to monte-carlo as opposed to the analog components like voltage, Resistance and so on (...)

## Output voltage of Boost PFC circuit is higher than calculated?

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.

## [Moved]: MC ignored warning in Monte Carlo simulation

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?

## As-soon-as-possible (ASAP) and As-late-as-possible (ALAP) scheduling

Be neither obsessive nor a procrastinator, so to speak. Rather, be timely. Do it ATAP. So soon or late also has factors of probability of being wrong from tolerances and exceptions to mean, thus the precise algorithm must consider all potential variances and the probabilities to yield an optimal schedule. monte carlo (...)

## Finding critical path in a combinational block

In general I would expect DRC and monte carlo methods will determine critical timing and path length issues. Critical path (shortest latency) results should come out of a manual or auto generated set of test vectors in combinational and sequential table and generate the results which could (...)

## Monte Carlo for Inherited Block in Cadence

I am in the beginning stage of my research and I am trying to reproduce the output for Arbiter PUF, which I am struggling at one point now from almost two months now. I would be very grateful if you can just give me a hint on it. I am trying to implement the PUF on Cadence Virtuoso and Struggling with introducing process variation. My (...)

## Monte Carlo simulation Error

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?

## Monte-Carlo simulations to find optimum size of a circuit

Hi How to apply monte-carlo simulations to find optimum size of a circuit like flip-flop in HSPICE? Thanks

## "Delay Distribution Density" versus Delay

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.

## curve of "number of samples"

dear scholars How to achieve curve of "number of samples" versus, for instance, current in monte-carlo method and simulation for a simple MOS circuit? thanks for your helps.

## Cadence Monte Carlo---How to save sizing

Hi, I am running monte carlo (MC) simulations for a big circuit in cadence and saw that mismatches would significantly affect the performance of the circuit. Now I want to figure out which part is more sensitive and redesign. In ADEXl you cannot have direct plot to look at the voltage of each node (as far as I know), (...)

## NBTI phenomena in simulators such as Spectere

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.

## Interpretiing data from Cadence stability analysis

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.

## Monte Carlo simulation for W/L+variaition oercent

I want to do monte carlo simulation with Gaussian distribution for W/L (width/length) in HSPICE in 0.35um CMOS technology. How much variation percent should I consider ? and why?

## [Moved]: Monte Carlo Yield 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

## Importance sampling to accelerate Monte carlo simulation

In transistor level circuits for smaller technology nodes, the on-chip process variations causes many reliability issues. To find the probability distribution of circuit delay I would like to do a monte carlo simulation by sampling channel length distribution of each transistor randomly and find the circuit delay for (...)

## Monte Carlo - circuit exlusion

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.

## Monte Carlo Analysis Histogram

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 (...)

## Monte Carlo Analysis

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 W1=gauss(2.072u,0.0667,3) (...)

## What is the meaning of "offset between the threshold voltages"

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.

## Monte Carlo sigma value

--- > What is sigma value ? See here. The sigma value (σ) corresponds to the standard deviation of a distribution (or the square root of the variance). In monte carlo simulations the σ value often

## HSIM mixed mode co-simulation and Monte Carlo analysis

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 (...)

## can u tell me the steps for monte carlo simulation in cadence virtuoso 6.1.4 ADE

after the monte carlo run, say I ran only 2 runs, what are the different folders names '1' and '2' . Any idea?

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