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Spectre and Simulink cosimulation - Problem on defining cosimulation inputs

Milad M

Dear All,

     I have done a successful Spectre/Simulink cosimulation. Then, I used Optimization Toolbox of MATLAB to find the best value of the cosimulation input in order to minimize the cosimulation output. I will explain the MATLAB codes if someone is interested.

     Now, I want to use this method to optimize the parameters of a sample circuit. I'd like to define cosimulation inputs some different things such as the value of a resistor or a capacitor or even the pulse width of a pulse voltage source in the circuit. But, looking at the tutorials, it is only possible to define cosimulation inputs the instance sources such as Vin:wave.

    How can I define cosimulation inputs something different? 

Sincerely Yours,

Milad

Parents

  • Dear Andrew,

        Thanks for your reply. It's really surprising for me. I hope the interface "SpectreRF Engine", with all these huge tasks, be able to consider any other inputs on the next versions.

        Fortunately, I've just done a successful optimization using a direct approach (not using the interface). I'd like to share the MATLAB script here to be useful for the other users with the same problem:

        It is a circuit with a dc voltage (1 volt) and two series resistor (R1=1k and R0=?). The optimization is going to find the value of R0 in order to have V0 = 0.5 volt.

    function [P] = lsqspectre     % lsqspectre demonstrates using fminbnd with spectre.

    Var = fminbnd(@tracklsq, 10, 2000);

    P = Var;

    function F = tracklsq(Var)

    % Track the output of input.scs to a signal of 0.5

    P = Var;

    % Read input.scs into cell A
    fid = fopen('input.scs','r');
    i = 1;
    tline = fgetl(fid);
    A{i} = tline;
    while ischar(tline)
    i = i+1;
    tline = fgetl(fid);
    A{i} = tline;
    end
    fclose(fid);

    % Change cell A
    A{19} = sprintf('R0 (Vout 0) resistor r=%d',P);

    % Write cell A into txt
    fid = fopen('input.scs', 'w');
    for i = 1:numel(A)
    if A{i+1} == -1
    fprintf(fid,'%s', A{i});
    break
    else
    fprintf(fid,'%s\n', A{i});
    end
    end


    % Run spectre and compute function value
    !spectre input.scs;
    signal = cds_srr('input.raw','tran-tran','Vout');
    F1 = signal.V(end) - 0.5;
    F = abs(F1);

    end
    end

        I will be pleased to explain more about this approach for any one who is interested.

    Sincerely Yours,

    Milad

Reply

  • Dear Andrew,

        Thanks for your reply. It's really surprising for me. I hope the interface "SpectreRF Engine", with all these huge tasks, be able to consider any other inputs on the next versions.

        Fortunately, I've just done a successful optimization using a direct approach (not using the interface). I'd like to share the MATLAB script here to be useful for the other users with the same problem:

        It is a circuit with a dc voltage (1 volt) and two series resistor (R1=1k and R0=?). The optimization is going to find the value of R0 in order to have V0 = 0.5 volt.

    function [P] = lsqspectre     % lsqspectre demonstrates using fminbnd with spectre.

    Var = fminbnd(@tracklsq, 10, 2000);

    P = Var;

    function F = tracklsq(Var)

    % Track the output of input.scs to a signal of 0.5

    P = Var;

    % Read input.scs into cell A
    fid = fopen('input.scs','r');
    i = 1;
    tline = fgetl(fid);
    A{i} = tline;
    while ischar(tline)
    i = i+1;
    tline = fgetl(fid);
    A{i} = tline;
    end
    fclose(fid);

    % Change cell A
    A{19} = sprintf('R0 (Vout 0) resistor r=%d',P);

    % Write cell A into txt
    fid = fopen('input.scs', 'w');
    for i = 1:numel(A)
    if A{i+1} == -1
    fprintf(fid,'%s', A{i});
    break
    else
    fprintf(fid,'%s\n', A{i});
    end
    end


    % Run spectre and compute function value
    !spectre input.scs;
    signal = cds_srr('input.raw','tran-tran','Vout');
    F1 = signal.V(end) - 0.5;
    F = abs(F1);

    end
    end

        I will be pleased to explain more about this approach for any one who is interested.

    Sincerely Yours,

    Milad

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