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How can I give Addictive White Gaussian Noise(AWGN) as an INPUT?

Surya Kiran

Hi,

I am Using Cadence Virtuoso 6.1

I am designing front end design and I need to add an AWGN as an input to verify it, I am using Spectre Simulator for this design.

Please help me with this.

Thank you

Surya

Parents

  • Surya,

    In analogLib, you could use vsource. Vsource has a number of options to add random noise. Check out parameters isnoisy, noisefile, noisevec, noisetype, noiseinterp, rjseed rjrms, pjamp, pjfreq, pjtype.

    You could also use a VerilogA model:

    `include "disciplines.vams"
    `include "constants.vams"

    module noisesrc (op);
    output op;
    electrical op;

    analog begin
      @(initial_step) $display("Noise arg is ",sqrt(4*`P_K*$temperature*50.0),"V/sqrt(Hz)");
      V(op) <+ white_noise(4*`P_K*$temperature*50.0);
    end

    endmodule

    This is a small signal noise source for "noise" analysis. If using transient, you could use a verilogA model using $rdist_normal() - but not sure what your requirements are (you could also use transient noise with one of the above sources).

    Regards,

    Andrew.

Reply

  • Surya,

    In analogLib, you could use vsource. Vsource has a number of options to add random noise. Check out parameters isnoisy, noisefile, noisevec, noisetype, noiseinterp, rjseed rjrms, pjamp, pjfreq, pjtype.

    You could also use a VerilogA model:

    `include "disciplines.vams"
    `include "constants.vams"

    module noisesrc (op);
    output op;
    electrical op;

    analog begin
      @(initial_step) $display("Noise arg is ",sqrt(4*`P_K*$temperature*50.0),"V/sqrt(Hz)");
      V(op) <+ white_noise(4*`P_K*$temperature*50.0);
    end

    endmodule

    This is a small signal noise source for "noise" analysis. If using transient, you could use a verilogA model using $rdist_normal() - but not sure what your requirements are (you could also use transient noise with one of the above sources).

    Regards,

    Andrew.

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