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-- Copyright (c) 2003 Mentor Graphics Corporation
--
-- This model is a component of the Mentor Graphics VHDL-AMS educational open 
-- source model library, and is covered by this license agreement. This model,
-- including any updates, modifications, revisions, copies, and documentation 
-- are copyrighted works of Mentor Graphics. USE OF THIS MODEL INDICATES YOUR 
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-- notice that this model has been modified and the date of modification; and 
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-- THIS MODEL IS LICENSED TO YOU "AS IS" AND WITH NO WARRANTIES, EXPRESS OR 
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-- File       : e_Sqrt.vhd
-- Author     : Mentor Graphics
-- Created    : 2003/03/26
-- Last update: 2003-05-20
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-- Description: Square root function with electrical connections
-- This model produces a negative output value if the input is negative ... 
-- output = -1.0*k*sqrt(-1.0*input)) 
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-- Revisions  :
-- Date        Version     Author              Description
-- 2003/03/26  1.0         Mentor Graphics     Created    
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library IEEE;
use IEEE.electrical_systems.all;
use ieee.math_real.all;

entity e_Sqrt is
  generic (
    k : real := 1.0);  -- Gain
  port (terminal input  : electrical;
        terminal output : electrical);
end entity e_Sqrt;

architecture simple of e_Sqrt is
  quantity vin across input to electrical_ref;
  quantity vout across iout through output to electrical_ref;
begin
  if vin < 0.0 use
    vout == -1.0*k*sqrt(-1.0*vin);
  else
    vout   == k*sqrt(vin);
  end use;
end architecture simple;

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-- Copyright (c) 2003 Mentor Graphics Corporation
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