-------------------------------------------------------------------------------
-- 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,
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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       : current_multiplier.vhd
-- Author     : Mentor Graphics
-- Created    : 2003-05-30
-- Last update: 
-------------------------------------------------------------------------------
-- Description: Ideal current multiplier model. Total current into "pos" terminal 
-- is "n" times the current through pos to neg. If current i goes from pos to neg,
-- then current (n - 1)i enters pos but is by-passed to electrical_ref (absolute ground).
-- A perfect short (0 volts) is maintained across pos to neg at all times.
-- This model can be used to multiply the current drawn by a single electrical load, to
-- make it represent multiple identical loads. Useful for Simultaneously Switching Outputs
-- (SSO) Modeling and Analysis.
-- Circuit topology:
--
--  "pos" _
--        |
--        |_______    
--        |	      |
--        |	      |
--      i \/	  \/ (n-1)i
--        |	      |
--        |	   ___|___
--        |	     ___
--  "neg" -	      _
--
-------------------------------------------------------------------------------
-- Revisions  :
-- Date        Version     Author              Description
-- 2003-05-30  1.0         Mentor Graphics     Created
-------------------------------------------------------------------------------

library IEEE;
use IEEE.electrical_systems.all;

entity current_multiplier is
  generic (
    n	: integer := 1		-- Multiplying factor 
	);             
  port (
    terminal pos, neg : electrical);
end entity current_multiplier;
 
architecture behavioral of current_multiplier is
  constant rn : real := real(n);           -- Convert n to a real number rn
  quantity v across i through pos to neg;  -- Voltage across (forced to = 0) and main current through
  quantity n_minus_one_i through pos to electrical_ref;  -- Bypass current equal to (n-1)*i

begin
		n_minus_one_i == (rn - 1.0)*i;
		v == 0.0;
end architecture behavioral;

-------------------------------------------------------------------------------
-- Copyright (c) 2003 Mentor Graphics Corporation
-------------------------------------------------------------------------------