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-- Copyright (C) 1999-2002 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: test169.ams,v 1.1 2002-03-27 22:11:19 paw Exp $
-- $Revision: 1.1 $
--
-- ---------------------------------------------------------------------
-----------------------------------------------------------------------------
-- Ebers-moll Model for a transistor --
-- VHDL-AMS Implementation --
-- Developed at the Distributed Processing Lab at the University --
-- of Cincinnati --
-- by VishwaShanth Kasula on May 10, 1999 --
--------------------------------------------------------------------
-- Circuit Topology --
-- BJT Ebers-Moll static model
-- Testbench Ckt to evaluate the DC operatioing point of an npn BJT,
-- Sedra smith page no. 152, fig 4.9
--------------------------------------------------------------------
-- Three regions are simulated
-- Active region, vbb = 4.0 V
-- Saturation region, vbb = 6.0 V
-- Cutoff region, vbb = 0.0;
PACKAGE electricalSystem IS
NATURE electrical IS real ACROSS real THROUGH ground reference;
FUNCTION SIN(X : real) RETURN real;
FUNCTION EXP(X : real) RETURN real;
END PACKAGE electricalSystem;
use work.electricalsystem.all;
entity bjt_npn is
generic(isat : real := 1.0e-16; -- Saturation Current
bf : real := 100.0; -- Ideal maximus forward current
br : real := 1.0; -- ideal maximum reverse current
rb : real := 1.0e-5; -- Base resistance
rc : real := 1.0e-5; -- collector resistance
re : real := 1.0e-5; -- emmiter resistance
vaf : real := 100.0); -- Forward Early Voltage
port(terminal e,b,c : electrical);
end bjt_npn;
architecture structure of bjt_npn is
terminal b1, c1, e1 : electrical;
quantity vbo across ib through b to b1;
quantity vco across ic through c to c1;
quantity veo across ie through e to e1;
quantity vct across Ict through c1 to e1;--current source
quantity vbe across ibe through b1 to e1;
quantity vbc across ibc through b1 to c1;
quantity vce : real := 1.0; -- used to calculate VCE
constant gmin : real := 1.0e-12; -- condutsnce in parallel with every pn junction
constant vt : real := 0.02589; -- thermal voltage
begin
brk : break vbe => 1.0, vbc => -1.0;
diodecond1 : if(vbe > -5.0*vt) use
diodebef : ibe == ((isat*(exp(vbe/vt) - 1.0)) + (gmin*vbe))/bf;
elsif (vbe <= -5.0*vt ) use
diodeber: ibe == ((-1.0*isat) + (gmin*vbe))/bf;
end use;
diodecond2 : if(vbc > -5.0*vt) use
diodebcf : ibc == ((isat*(exp(vbc/vt) - 1.0)) + (gmin*vbc))/br;
elsif(vbc <= -5.0*vt) use
diodebcr : ibc == ((-1.0*isat) + (gmin*vbc))/br;
end use;
bres : vbo == ib * 1.0e-6;
cres : vco == ic * 1.0e-6;
eres : veo == ie * 1.0e-6;
kcl_eqn : ie == -1.0*(ib + ic);
vcevolt : vce == vbe - vbc;
ictdep : Ict == ((Ibe*bf) - (Ibc*br)) * (1.0 -(vbc/vaf));
end architecture structure;
--*****************************************************
--TEST BENCH
use std.textio.all;
use work.electricalsystem.all;
entity bjt_testbench is
end bjt_testbench;
architecture structure of bjt_testbench is
terminal t1, t2, t3, t4 : electrical ;
component bjt_npn_comp
generic(isat : real := 1.0e-16; -- Saturation Current
bf : real := 100.0; -- Ideal maximus forward current
br : real := 1.0; -- ideal maximum reverse current
rb : real := 1.0e-5; -- Base resistance
rc : real := 1.0e-5; -- collector resistance
re : real := 1.0e-5; -- emmiter resistance
vaf : real := 100.0); -- Forward Early Voltage
port(terminal e,b,c : electrical);
end component;
for all : bjt_npn_comp use entity work.bjt_npn(structure);
quantity vcc across icc through t1 to electrical'reference;
quantity vrc across irc through t1 to t2;
quantity vbb across ibb through t3 to electrical'reference;
quantity vre across ire through t4 to electrical'reference;
begin
bjt : bjt_npn_comp
generic map (isat => 1.8104e-15, vaf => 100.0)
port map(t4,t3,t2);
emres : vre == ire * 3.3e3;
ccurr : vcc == 10.0;
ecurr : vbb == 6.0;
cores : vrc == irc * 4.7e3;
end architecture structure;
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