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Moving average offset in verilogA

jorgevdelacruzN

Hi,

I'm using the "11277434" solution to implement a moving average function on verilogA but the problem is that I'm always getting a different offset on the simulations. Is there any way to cancel this offset? I saw that in the new version of the function for the viva calculator this problem, with the offset, was solved. Unfortunately, I can't migrate the skill code into verilogA. Do you have any suggestions to avoid the offset issue in the verilogA code?

verilogA Code:

parameter    real    gain=1.0;
parameter    real    time_window= 1u from (0:inf);

real x, k1;

analog begin

    @(initial_step) k1 = gain/time_window;

    x    =    k1*(V(in)- absdelay(V(in),time_window));
    V(out) <+  idt(x,0.0);
end
endmodule

Parents

  • I found the verilogA and also encountered the offset issue. In my application I was able to work around it by first determining the initial offset at time=0 and used it to calculate the integral

    parameter    real    gain=1.0;
    parameter    real    time_window= 1u from (0:inf);

    real x, k1;

    real y0;

    analog begin

        @(initial_step) begin

          k1 = gain/time_window;

         y0 = V(in);

        end

        x    =    k1*(V(in)- absdelay(V(in),time_window));
        V(out) <+  y0 + idt(x,0.0);
    end
    endmodule

Reply

  • I found the verilogA and also encountered the offset issue. In my application I was able to work around it by first determining the initial offset at time=0 and used it to calculate the integral

    parameter    real    gain=1.0;
    parameter    real    time_window= 1u from (0:inf);

    real x, k1;

    real y0;

    analog begin

        @(initial_step) begin

          k1 = gain/time_window;

         y0 = V(in);

        end

        x    =    k1*(V(in)- absdelay(V(in),time_window));
        V(out) <+  y0 + idt(x,0.0);
    end
    endmodule

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