msbOptimizer

Optimize device parameters to set up simulation environment

Since R2024b

Description

Use the msbOptimizer class to optimize the device parameters used in the simulation environment. This class supports Cadence^® and Simulink^® simulation environments. The class creates an msbOptimizer object using specified arguments. You can then use the optimizeDesign method to optimize the circuit parameters.

If you select different corners in the design, the msbOptimizer finds the best solution that satisfy all metrics under all corners.

To use this functionality, you need a license for Global Optimization Toolbox.

Creation

Syntax

msbOptimzer(DesignName='pll')

msbOptimzer(SimulationEnvironment='simulink',OutputsSetup=outputTable,VariableSetup=variableTable,DesignName='pll')

Description

msbOptimzer(DesignName='pll') creates an msbOptimizer object with DesignName property set to pll.

msbOptimzer(SimulationEnvironment='simulink',OutputsSetup=outputTable,VariableSetup=variableTable,DesignName='pll') creates an msbOptimizer object using the specified DesignName, VariableSetup, and OutputsSetup arguments in the Simulink environment.

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Example: moptimizer = msbOptimizer(SimulationEnvironment='simulink',VariableSetup=variableTable,DesignName='DSM2ndOrder') optimizes the variables of a second order DSM in the Simulink environment.

SimulationEnvironment — Simulation environment

cadence (default) | simulink

Simulation environment where you want to optimize the parameters, specified as cadence or simulink.

Note

If you set SimulationEnvironment as simulink, you must provide the DesignName argument.

Data Types: char

OutputsSetup — Performance specifications

table

Performance specifications for design whose parameters are being optimized, specified as a table. The table requires five columns: Test, Name, Weight, Units, and Spec.

Note

If you set SimulationEnvironment as simulink, you must provide the OutputsSetup argument.

Note

If you set SimulationEnvironment as cadence, the class ignores the specified OutputsSetup and gets the data from the adeInfo object in the base workspace.

VariableSetup — Variables or parameters to be optimized

table

Variables or parameters to be optimized, specified as a table. The table requires two columns: parameters and values

Note

If you set SimulationEnvironment as simulink, you must provide the VariableSetup argument.

Note

If you set SimulationEnvironment as cadence, the class ignores the specified VariableSetup and gets the data from the adeInfo object in the base workspace.

DesignName — Name of Simulink model

string

Name of the Simulink model whose design parameters are optimized, specified as a string.

Note

If you set SimulationEnvironment as simulink, you must provide the DesignName argument.

Data Types: char

Object Functions

optimizeDesign

Optimize circuit design in simulation environment

Examples

Optimize Parameters for Second-Order DSM in Simulink

Define the performance specifications of a second-order DSM.

outputTable=table();
outputTable.Test=["ACMeas";"ACMeas";"ACMeas";"ACMeas";"ACMeas"];
outputTable.Name={'SNR';'SFDR';'SINAD';'ENOB';'NoiseFloor'};
outputTable.Weight=[100;40;35;90;15];
outputTable.Units={'dB';'dB';'dB';'bits';'dB'};
outputTable.Spec={'> 72';'> 74';'> 72';'maximize 11.5';'< -78'}

outputTable=5×5 table
      Test           Name         Weight     Units            Spec       
    ________    ______________    ______    ________    _________________

    "ACMeas"    {'SNR'       }     100      {'dB'  }    {'> 72'         }
    "ACMeas"    {'SFDR'      }      40      {'dB'  }    {'> 74'         }
    "ACMeas"    {'SINAD'     }      35      {'dB'  }    {'> 72'         }
    "ACMeas"    {'ENOB'      }      90      {'bits'}    {'maximize 11.5'}
    "ACMeas"    {'NoiseFloor'}      15      {'dB'  }    {'< -78'        }

Define the variables to optimize.

variableTable=table();
variableTable.parameters={'a1';'a2';'b1';'b2'};
variableTable.values=["0.15:0.005:0.16";"0.55:0.005:0.7";"0.15:0.005:0.16";"0.55:0.005:0.7"]

variableTable=4×2 table
    parameters         values      
    __________    _________________

      {'a1'}      "0.15:0.005:0.16"
      {'a2'}      "0.55:0.005:0.7" 
      {'b1'}      "0.15:0.005:0.16"
      {'b2'}      "0.55:0.005:0.7" 

Create the msbOptimizer object.

moptimizer = msbOptimizer(SimulationEnvironment='simulink',OutputsSetup=outputTable,VariableSetup=variableTable,DesignName='DSM2ndOrder')

Number of parameters: 4
Recommended max number of simulations: 200
Recommended min surrogate points: 120

moptimizer = 
  msbOptimizer with properties:

               DesignName: 'DSM2ndOrder'
                   Solver: "surrogateopt"
    SimulationEnvironment: 'simulink'
             BestSolution: []
              BestMetrics: []
     FinalOptimizerStatus: []
             OutputsSetup: [5×5 table]
          ParametersSetup: [4×2 table]
           ParameterNames: ["a1"    "a2"    "b1"    "b2"]
          ParameterValues: ["0.15:0.005:0.16"    "0.55:0.005:0.7"    "0.15:0.005:0.16"    "0.55:0.005:0.7"]
                    Eflag: []
                   Trials: []
              Constraints: [5×11 table]
                  Corners: []
     ParameterScaleFactor: [0.0050 0.0050 0.0050 0.0050]

Optimize the parameters.

[sol,metric] = moptimizer.optimizeDesign

Maximum number of simulations: 64
Number of parallel simulations: 8

Running 8 simulations in Simulink...

Running 8 simulations in Simulink...

Running 8 simulations in Simulink...

Running 8 simulations in Simulink...

Running 8 simulations in Simulink...

Running 8 simulations in Simulink...

Running 8 simulations in Simulink...

Running 8 simulations in Simulink...

Optimizer was unable to meet some or all the specifications.
You can continue optimization from the current state by using the checkpoint file.
E.g., if your object is called 'optimizer', run the following command:
 [solution, bestMetrics] = optimizer.optimizeDesign('useCheckPoint',true)

sol=4×2 table
    Name    Value
    ____    _____

    "a1"    0.155
    "a2"      0.6
    "b1"    0.155
    "b2"     0.66

metric=5×4 table
        Name        FinalMetrics         Specs         Units 
    ____________    ____________    _______________    ______

    "SNR"              70.699       "> 72"             "dB"  
    "SFDR"             80.248       "> 74"             "dB"  
    "SINAD"            70.699       "> 72"             "dB"  
    "ENOB"             11.452       "maximize 11.5"    "bits"
    "NoiseFloor"      -78.276       "< -78"            "dB"  

As you can see, the function was not able to meet the required SNR amd SINAD specifications. You can use the check point file to continue optimizing from the current state.

Version History

Introduced in R2024b