Published by Ramses van der Toorn
Delft University of Technology
July 2010


Description
===========


MXT504.7-bug 1: "noise sources in reverse extrinsic base-collector
currents do not follow the parameter value dependent circuit topology"

Versions of Mextram in which this bug may occur
===============================================

Mextram 504.7 Mextram 504.8, Mextram 504.9 beta.

Version of Mextram in which this bug was resolved
=================================================

Mextram 504.9 and higher


Fix (general description): 
==========================

Make noise sources corresponding to Iex, Ib3, XIex follow the
parameter dependent topology, as defined in the model Definition
document.  See also the Verilog implementation example below for
details about the right connections of the noise sources.


Fix for TU-Delft Verilog-A implementation:
==========================================

In evaluate.inc: Replace Lines:
------------------------------------------------------------------
Original Verilog coding, erroneous:

   I(b1, c1)  <+ white_noise(powerRBCS);          // "bas_col_reve" 
   I(b1, c1)  <+ flicker_noise(powerRBC1f, 1);    // "bas_col_reve" 
   I(b1, c1)  <+ white_noise(powerExCS);          // "Ext_bas_col" 
   I(b1, c1)  <+ flicker_noise(powerExC1f, 1);    // "Ext_bas_col" 
   I(b, c1)   <+ white_noise(powerExCSMOD);       // "Ext_bas_col" 
   I(b, c1)   <+ flicker_noise(powerExC1fMOD, 1); // "Ext_bas_col" 
-------------
New Verilog coding, correct:

   I(b1, c4)  <+ white_noise(powerRBCS);          // "bas_col_reve" 
   I(b1, c4)  <+ flicker_noise(powerRBC1f, 1);    // "bas_col_reve" 
   I(b1, c4)  <+ white_noise(powerExCS);          // "Ext_bas_col" 
   I(b1, c4)  <+ flicker_noise(powerExC1f, 1);    // "Ext_bas_col" 
   I(b,  c3)  <+ white_noise(powerExCSMOD);       // "Ext_bas_col" 
   I(b,  c3)  <+ flicker_noise(powerExC1fMOD, 1); // "Ext_bas_col"
------------------------------------------------------------------

Acknowledgments
===============

Gratitude due to Samuel Mertens (ANSYS Inc.), Geoffrey Coram (Analog
Devices Inc.) and Jos Peters (NXP Semiconductors).
