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|
-- Copyright (C) 2000-2002 The University of Cincinnati.
-- All rights reserved.
-- This file is part of VESTs (Vhdl tESTs).
-- UC MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
-- SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
-- OR NON-INFRINGEMENT. UC SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
-- LICENSEE AS A RESULT OF USING, RESULT OF USING, MODIFYING OR
-- DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
-- By using or copying this Software, Licensee agrees to abide by the
-- intellectual property laws, and all other applicable laws of the U.S.,
-- and the terms of this license.
-- You may modify, distribute, and use the software contained in this
-- package under the terms of the "GNU GENERAL PUBLIC LICENSE" version 2,
-- June 1991. A copy of this license agreement can be found in the file
-- "COPYING", distributed with this archive.
-- 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
-- ---------------------------------------------------------------------
--
-- $Id: double_tuned.ams,v 1.1 2002-03-27 22:11:19 paw Exp $
-- $Revision: 1.1 $
--
-- ---------------------------------------------------------------------
--************************************************************************
-- Structural Model of a DOUBLED TUNED TRANSFORMER
-- VHDL-AMS implementation
-- Developed at Distributed Processing Laboratory
-- University of Cincinnati
--************************************************************************
--************************************************************************
--
-- ________________________________
-- V_in | |
-- o-----|-------- ------------|---o V_out
-- | | | | | |
-- | | | | | |
-- | | | | | |
-- | | >rp rs< | |
-- | | > < --- |
-- FM | _|_ | . | --- | FM & AM Signal
-- Signal | ___ ( ) ( ) |Cs |
-- | | ( ) || ( ) | |
-- | |Cp ( ) || ( ) | |
-- | | | Lp Ls | | |
-- o-----|-------- ------------|---o V_out_gnd
-- Vin_gnd |________________________________|
--
--************************************************************************
PACKAGE electricalSystem IS
NATURE electrical IS real ACROSS real THROUGH ground reference;
FUNCTION SIN (X : real ) RETURN real;
FUNCTION COS (X : real ) RETURN real;
FUNCTION EXP (X : real ) RETURN real;
FUNCTION SQRT (X : real) RETURN real;
END PACKAGE electricalSystem;
------------------------------------------------------------------------------
---------------------- TUNED TRANSFORMER ------------------------------------
------------------------------------------------------------------------------
USE work.electricalSystem.all;
ENTITY FM_2_AM_Converter IS
generic (freq_fm : real := 1.0);
port (terminal Signal_in, Signal_out : electrical);
END FM_2_AM_Converter;
ARCHITECTURE behav OF FM_2_AM_Converter IS
CONSTANT k :real:=0.4;
CONSTANT lp :real:=1.0e-3;
CONSTANT ls :real:=1.0e-3;
CONSTANT rp :real:=10.0;
CONSTANT rs :real:=10.0;
--> Q = 2*PI*Freq*L/R : for 10.7 MHz -> q=6723
terminal temp1,temp2: electrical;
quantity v_rp across i_rp through Signal_in to temp1;
quantity v_rs across i_rs through temp2 to Signal_out;
quantity V_cp across i_cp through Signal_in to ground;
quantity V_cs across i_cs through Signal_out to ground;
QUANTITY V_lp ACROSS i_lp Through temp1 to ground;
quantity v_ls across i_ls through temp2 to ground;
quantity m : real ; -- mutual inductance;
BEGIN -- behavior
brk : break i_lp => 0.0, i_ls => 0.0,v_cp=>0.0,v_cs=>0.0;
mutual : m == k * sqrt(lp*ls);
voltp : v_lp == lp * i_lp'dot + m * i_ls'dot;
volts : v_ls == ls * i_ls'dot + m * i_lp'dot;
i_cp == (25.331/(freq_fm*freq_fm))*v_cp'dot; -- cal. using the value of Inductance
i_cs == (25.331/(freq_fm*freq_fm))*v_cs'dot; -- as 1.0e-3.
-- modify this if u want to use another
v_rp == rp *i_rp; -- value of Lp and ls
v_rs == rs *i_rs; -- c =1/(2*PI*F)*(2*PI*F)*L
END behav;
------------------------------Test Waveforms-----------------------
--> FM wave generator
----------------------
use work.electricalsystem.all;
ENTITY fm_source IS
generic(c_freq:real:=100.0e6; -- carrier frequency
s_freq:real:=25.0e3; -- modulating(signal) frequency
V_fm :real:=1.0 -- Peak voltage of FM signal
);
PORT(TERMINAL fm_out,fm_gnd : electrical);
END fm_source;
ARCHITECTURE fm_behavior OF fm_source IS
quantity V_fm_signal across i_fm_signal through fm_out to fm_gnd;
BEGIN
--- the max. freq. deviation is 75.0Khz for FM Signal.
V_fm_signal == (V_fm*sin((2.0*22.0/7.0*c_freq*real(time'pos(now))*1.0e-15)+(75.0e3/s_freq*sin(2.0*22.0/7.0*s_freq*real(time'pos(now))*1.0e-15))));
END ARCHITECTURE fm_behavior;
-------------------------------- TEST BENCH --------------------------
use work.electricalSystem.all;
entity test is
end test;
architecture structure of test is
terminal t1,t2,t3 : electrical;
--> Component Declarations
component fm_source is
generic(c_freq:real:=100.0e6; -- carrier frequency
s_freq:real:=25.0e3; -- modulating(signal) frequency
V_fm:real:=1.0 -- Peak Voltage of FM Signal
);
PORT( TERMINAL fm_out,fm_gnd : electrical);
end component;
for all: fm_source use entity work.fm_source(fm_behavior);
component FM_2_AM_Converter IS
generic (freq_fm : real := 1.0);
port (terminal Signal_in, Signal_out : electrical);
end component;
for all : FM_2_AM_Converter use entity work.FM_2_AM_Converter(behav);
quantity v_out across i_out through t2 to ground;
begin
FM_AM : FM_2_AM_Converter generic map(freq_fm=>10.7816e6)
port map(t1,t2);
fm_ip : fm_source generic map(10.7e6,10.0e3,1.0)
port map(t1,ground);
resout : v_out == i_out * 1.0e6;
end structure;
------------------------------ NOTES -------------------------------------
-- It is a tuned transformer with the resonant freq. slighty higher
-- than the carrier freq.
--
-- Q = 2*PI*Freq*L/Rl BandWidth = F_carrier/Q
-- F_carrier = 1/2*PI*sqrt(L*C)
--
-- Tune the Transformer to a frequency of (All quantities in MHz)
-- ( F_carrier + 0.075 + 0.005 + Band_width )
-- |
-- |
-- *-> Max Deviation
----------------------------------------------------------------------------
|
