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VHDL-AMS delayed attribute

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Dear all,

I am currently trying to model a simple delay in VHDL-AMS.

entity DELAY is
  port(
    terminal vin : electrical;
    terminal vout : electrical
  );
end DELAY;
architecture behavioral of DELAY is
  quantity vo across iout through vout to ground;
  quantity vi across iin through vin to ground;
begin
  vi == 1.0E12 * iin;
  vo == vi'delayed(1.0E-9);
end behavioral;

However, when I try to simulate that, the input signal is not only delayed but has also a slewrate added. This is shown in the image below (green is vin and red is vout). Does anyone know where this slewrate comes from and how this can be avoided?


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