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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 sweep any (...)
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 .
Hi, I am trying to use ADEXL to run spectre monte carlo spectre simulations using Sungrid (SGE) for distributed (parallel) processing. However, I can't figure out how ADEXL uses the Run Options -> 'command' field to execute "qsub -q "bm.q" -cwd -V -b y -j y" . There is no output log related to sungrid, just a file that says it failed. I'm un
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, 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,
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 analysis remains fixed at "po
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
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 special ci
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.
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
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 has quite a (...)
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 the mux's to get the de
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 variable of in
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! Thank you, Vaah
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
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
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
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.
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 performance (I assume thi
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
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
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
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 .param Lmin='0.18u' vdd vdd gnd dc=0
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 simmode=0 and (...)
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.
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 and changes which are widt
Hi all Could anyone show me how to run bandgap process mismatch simualtion in cadence ADE XL? I am newbee to this cadence please show me step by step. I did the step below but it show the error (WIA-1135) the waveform state file could not be loaded. This is my step: 1/ From schematic open ADE L , setup models, dc temp from -50 to 100, prob
Hi all Could any one show me how to run monte carlo from command line.? I do not have ADE XL simulator. Thanks
Mismatch parameters are process dependent, so you can find them in additional monte carlo simulation files if your process provider (foundry, fab) provides them, see e.g. this tutorial, pp. 10 ff.: 123178. Process size dependent Avt values for estimations you can find i
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 knows where to get info
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
hi dear friend. i have cadence 6.1.4. how i to run parametric analyse in monte carlo simulation? Tanks
You can perform several simulations using the minumum/maximum allowed values for these parameters so that you can predict the range of the output within this uncertainily. It is called "monte carlo" simulation.
Haiii, I have done the monte carlo simulation in Hspice using 32nm technology. I used the code .param + mult1=1 + polycd=agauss(0,0.06u,1) xl='polycd-sigma*0.06u' + nactcd=agauss(0,0.3u,1) xwn='nactcd+sigma*0.3u' + pactcd=agauss(0,0.3u,1) xwp='pactcd+sigma*0.3u' + toxcd=agauss(200,10,1) tox='toxcd-sigma*10' + vtoncd=agauss(0,0.05v,1
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.
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 like explained in the ADE Examples. (...)
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?
Hai all, Got this error message during monte carlo simulation in mentor graphics OBJECT "M6": Model P not yet defined. OBJECT "M13": Model N not yet defined. Can anyone the reason for this error? Do I need to add new library files? I'm using pyxis version 10.1
Can anyone tell me the steps for monte carlo simulation in Mentor Graphics? I'm using Pyxis version 10.1.
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 simuations often test these fo
you mean i have to manipulate (fix) monte-carlo library in PDK??? No. Copy it to a new file, out-comment there what you don't want, and .include this file instead of the original one.
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 be sorted. But I offer no step by step solution on each.