Appendix A Thermal Diode Calculations; Ideal Diode Equation - AMD ATHLON 8 Datasheet

25175H—March 2003

Ideal Diode Equation

Appendix A - Thermal Diode Calculations
Preliminary Information
Preliminary Information
Thermal Diode Calculations
This section contains information about the calculations for the
on-die thermal diode of the AMD Athlon™ XP processor model
8. For electrical information about this thermal diode, see
Table 17, "Thermal Diode Electrical Characteristics," on
page 42.
The ideal diode equation uses the variables and constants
defined in Table 29.
Table 29. Constants and Variables for the Ideal Diode Equation
Equation Symbol
n
Lumped ideality factor
f, lumped
k Boltzmann constant
q Electron charge constant
T Diode temperature (Kelvin)
V
Voltage from base to emitter
BE
I
Collector current
C
I
Saturation current
S
AMD Athlon™ XP Processor Model 8 Data Sheet
Appendix A
Variable, Constant Description
83