Programming instructions

Diodes
Multisim Component Reference Guide 3-2 ni.com
3.1.2 DC Model
The DC characteristic of a real diode in Multisim is divided into the forward and reverse
characteristics.
DC forward characteristic:
DC reverse characteristic:
where:
I
D
= current through the diode, in amperes
V
D
= voltage across the diode, in volts
V
T
= thermal voltage (= 0.0258 volts at room temperature (27°C))
BV = breakdown voltage
I
S
is equivalent to the reverse saturation current (I
o
) of a diode. In a real diode, I
S
doubles for
every 10-degree rise in temperature.
Other symbols used in these equations are defined in “Diode Parameters and Defaults”.
IIe VG V nV
DS
V
nV
DDT
D
T
=−








+∗ ≥−15
min
for
I
Ie VG nV V
IVG BVV nV
IBV V BV
Ie
BV
V
VBV
D
S
V
nV
DTD
SD D T
D
S
BV V
V
T
D
D
T
D
T
=
−








+∗ − ≤ ≤
−+∗ − < <−
−=−
−−+








<−











−
+






150
5
1
min
min
for
for
for
for
ComponentRef.book Page 2 Thursday, December 7, 2006 10:12 AM