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-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
library ieee; use ieee.math_real.all;
library ieee_proposed; use ieee_proposed.electrical_systems.all;
entity comp_2p2z is
generic ( gain : real := 100.0; -- high DC gain for good load regulation
fp1 : real := 7.5e3; -- pole location to achieve crossover frequency
fp2 : real := 531.0e3; -- pole location to cancel effect of ESR
fz1 : real := 403.0; -- zero locations to cancel L-C filter poles
fz2 : real := 403.0 );
port ( terminal input, output, ref : electrical );
end entity comp_2p2z;
----------------------------------------------------------------
architecture ltf of comp_2p2z is
quantity vin across input to ref;
quantity vout across iout through output to ref;
constant wp1 : real := math_2_pi * fp1; -- Pole freq (in radians)
constant wp2 : real := math_2_pi * fp2;
constant wz1 : real := math_2_pi * fz1; -- Zero freq (in radians)
constant wz2 : real := math_2_pi * fz2;
constant num : real_vector := ( 1.0,
(wz1 + wz2) / (wz1 * wz2),
1.0 / (wz1 * wz2) );
constant den : real_vector := ( 1.0e-9, 1.0,
(wp1 + wp2) / (wp1 * wp2),
1.0 / (wp1 * wp2) );
begin
vout == -1.0 * gain * vin'ltf(num, den);
end architecture ltf;
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