LND150 Depletion MOSFET model - diyAudio
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Old 12th June 2012, 01:00 PM   #1
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Location: Llanddewi Brefi, NJ
Default LND150 Depletion MOSFET model

Someone had posted a DMOS model for the LND150 on another forum. I've taken the Supertex info and re-worked it a tiny bit to come up with the following changes to their NMOS Model:

.SUBCKT BVS841_DepletionMosfets__1__5 10 20 30
M1 10 20 30 30 NMOS
+ NSUB=5.0e13
+ TPG=1
+ CGDO=2.1716e-12
+ RD=400
+ VTO=-1.50
+ VMAX=1.0e8
+ ETA=0.1
+ NFS=6.6e10
+ TOX=1.0e-7
+ LD=1.698e-9
+ UO=862.425
+ XJ=6.467e-7
+ DELTA=0.1
+ THETA=1E-5
+ L=10e-6
+ W=600e-6
+ KAPPA=1.0
+ )
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File Type: gif LND150.gif (17.4 KB, 280 views)
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Old 12th June 2012, 01:26 PM   #2
iko is offline iko  Canada
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I don't get it, supertex makes a whole library available, and LND150 has a model in it too (see below). Was there a problem with their model?

.MODEL LND150 NMOS (LEVEL=3 RS=150.00 NSUB=5.0E13
+DELTA=0.1 KAPPA=1.O TPG=1 CGDO=2.1716E-12
+RD=40.0 VTO=-2.0 VMAX=1.0E8 ETA=0.1
+NFS=6.6E10 TOX=1.0E-7 LD=1.698E-9 UO=862.425
+XJ=6.4666E-7 THETA=1.0E-5 CGSO=5.09E-10 L=10.0E-6
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Old 12th June 2012, 04:32 PM   #3
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It's just the VTO and RD which are modified -- but it looks somewhat more than the chart on page 3 of the datasheet:
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File Type: gif LND150_Comparison.gif (12.3 KB, 266 views)
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Old 5th June 2014, 10:28 PM   #4
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Join Date: Jan 2004
To make this model work in mutlsim, are the following connections correct?

10 = Drain
20 = Gate
30 = Source

if so, I don't see that much difference if you add a capacitor parallel to the source resistor.
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