Mextram

1
Mextram

• Overview
• New Mextram in Verilog-A Revision 504.6.1
• Revised Beta Release of the Mextram in Verilog-A
  Subversion 504.7.0
• A New Web Site

2
New Mextram in Verilog-A Revision
504.6.1(November, 2006)
Implemented

• Operation point (output) variables implemented
  following NXP Mextram 504.6 documentation.
• The units and descriptions for parameters and
  operation point variables according to LRM 2.2.
• A potentially dangerous initial_step event is
  eliminated.
• LRM 2.2 implementation of the correlated noise.
• The temperature and exponential function limiting
  revisited.

Planed but postponed for future releases.

• Realizing thermal nodes by thermal disciplines.

3
Operation Point (Output) Variables
ifdef __VAMS_COMPACT_MODELING__ define
OPP(nam, uni, des) ( desc"des", units"uni" )
real nam else define OPP(nam, uni,
des) endif
OPP(OP_ic, A, External DC collector
current) OPP(OP_gx, S, Forward transconductance)
OP_ic I(ltcgt) ddxInVb2 ddx(In, V(b2))
OP_gx ddxInVb2 - ddx(In, V(e1)) .print dc
x1OP_ic x1OP_gx
4
Eliminating initial_step Event
ifdef insideADMS _at_(initial_model) begin
else _at_(initial_step or
initial_step("static")) begin endif include
"initialize.inc" end // initial_step
begin initializeModel include
"initialize.inc end
5
LRM 2.2 Implementation of the Correlated Noise
real w_n_1 w_n_1 white_noise(1.0)
I(c2, e1) lt powerCCS w_n_1 I(c2, b2)
lt white_noise(powerII) twoqIavl w_n_1
electrical w_n_1 I(w_n_1) lt V(w_n_1)
I(w_n_1) lt white_noise(1.0) I(c2, e1) lt
powerCCS V(w_n_1) I(c2, b2) lt
white_noise(powerII) twoqIavl V(w_n_1)
6
Temperature and Exponential Function Limiting
define TMIN 20.0 define TMAX 600.0
7
Thermal Network Implemented Using Thermal
Discipline
module bjt504t_va (c, b, e, s, dt) thermal
dt Pwr(dt) lt Temp(dt) / RTH_Tamb_M Pwr(dt)
lt ddt(CTH_M Temp(dt)) Pwr(dt) lt -1.0
power
8
Revised Beta Release of the Mextram in Verilog-A
Subversion 504.7.0

• Revision 504.6.1Proposal for reverse BE
  junction tunneling current.
• Update documentation will be available on the web
  site in December.

9
A New Web Site

• http//mextram.sourceforge.net
• To support the releasing of the Mextam in
  Verilog-A for CMC.
• Integrate model releases, documentation and
  development with source code version control.
• The existing Mextram User Group
  sitehttp//hitec.ewi.tudelft.nl/mugwould
  continue to address topics of general users
  interest independently of the model
  implementation.