soft:cadence:monte_carlo:start
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soft:cadence:monte_carlo:start [2009/07/15 11:26] dominik.przyborowski created |
soft:cadence:monte_carlo:start [2019/03/08 14:08] (current) |
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| ====== Monte Carlo analysis ====== | ====== Monte Carlo analysis ====== | ||
| + | ===== AMS 3.70 ===== | ||
| <code>HIT-KIT 3.70; spectra</code> \\ | <code>HIT-KIT 3.70; spectra</code> \\ | ||
| <code>details: file:///opt/cds/designKits/ams_v3.70/www/hitkit/circuit_sim/montecarlo/mismatch.html</code> | <code>details: file:///opt/cds/designKits/ams_v3.70/www/hitkit/circuit_sim/montecarlo/mismatch.html</code> | ||
| - | ===== Models setting ===== | + | ==== Models setting ==== |
| To run MC simulations you must set Monte Carlo sections of elements models. \\ | To run MC simulations you must set Monte Carlo sections of elements models. \\ | ||
| So run //virtuoso analog design environment// and click **setup -> model libraries**. Next change in libraries (cmos53, res, cap, etc) name of section, from *tm to *mc. For example cmostm -> cmosmc. | So run //virtuoso analog design environment// and click **setup -> model libraries**. Next change in libraries (cmos53, res, cap, etc) name of section, from *tm to *mc. For example cmostm -> cmosmc. | ||
| - | ===== Run of simulation ===== | + | ==== Run of simulation ==== |
| After change the models, you run the simulation: **tools -> monte carlo** \\ | After change the models, you run the simulation: **tools -> monte carlo** \\ | ||
| Gauss distibution requiere over 30 samples. So **number of runs** should be higher than 30. To see all results, change ** save data between runs ** checkbox on true. | Gauss distibution requiere over 30 samples. So **number of runs** should be higher than 30. To see all results, change ** save data between runs ** checkbox on true. | ||
| - | ===== Results ===== | + | ==== Results ==== |
| Results as characteristic family: \\ | Results as characteristic family: \\ | ||
| In //setup outputs// set //data type// on //wave//. \\ | In //setup outputs// set //data type// on //wave//. \\ | ||
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| In //setup outputs// set //data type// on //scalar//. \\ | In //setup outputs// set //data type// on //scalar//. \\ | ||
| + | |||
| + | ===== AMS 4.00 ===== | ||
| + | <code>HIT-KIT 4.00; spectra</code> \\ | ||
| + | |||
| + | ==== Models setting ==== | ||
| + | To run MC simulations you must set Monte Carlo sections of elements models. \\ | ||
| + | **ICFB -> Hit-Kit Utilities -> Simulation Utilities -> Change Model Files -> Set MC models** | ||
| + | |||
| + | ==== Run of simulation ==== | ||
| + | Monte Carlo simulations are available in ADE XL. If cellview //adexl// doesn't exist: in schematic window click **Launch -> ADE XL** In dialog box choose **Create new view** and click OK (if adexl cellview exists - simple open it). \\ | ||
| + | In toolbar **Run** change //single run...// on // Monte Carlo Sampling//. In //Simulation options// (first button on right) set method (mismatch, process or all), specified number of iterations and finally mark //Save Data to Allow Family Plots//. | ||
| + | Finally run the simulations (green button on **run** toolbar). | ||
| + | |||
| + | \\ \\ | ||
| + | |||
| + | ** Remark ** All simulations type (dc, ac, etc) and outputs are set on **Data View** in **Tests** branch. | ||
| + | |||
| + | ===== Phase Margin, GBW and open loop gain ===== | ||
| + | Due to lack of corelations between instances on test bench, it is not possible to check above parameters in the standard AC simulations on replica circuits. \\ | ||
| + | The solution is to run MC on //stb// analysis and use following expressions to obtain histograms of DC open loop gain, phase margin and gain-bandwidth product: \\ | ||
| + | - DC Open loop gain: <code>dB20(value(getData("loopGain" ?result "stb") 0))</code> | ||
| + | - Phase Margin: <code>getData("/phaseMargin" ?result "stb_margin")</code> | ||
| + | - GainBandWidth: <code>getData("/phaseMarginFreq" ?result "stb_margin")</code> | ||
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