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Old 7th August 2014, 08:17 AM   #1
udok is offline udok  Austria
diyAudio Member
Join Date: Jul 2011
Default BF862 spice model problem?

Have you tested the NXP spice model for BF862?

The curves do not match the datasheet...
And worse: This is the first JFET with gate current in the uA range...

Any ideas?
Attached Images
File Type: jpg BF862_ID_Plot.jpg (197.9 KB, 35 views)
File Type: jpg F862_GateCurrent.jpg (200.4 KB, 35 views)

Last edited by udok; 7th August 2014 at 12:10 PM.
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Old 7th August 2014, 12:23 PM   #2
udok is offline udok  Austria
diyAudio Member
Join Date: Jul 2011
I modified the spice model to better fit the typical datasheet characteristics.
Ignoring the temperature parameters solves the problem
with the gate input current.

Model appended:
+ VTO = -0.75
+ BETA = 0.033
+ LAMBDA = 0.033
+ RD = 0.8
+ RS = 7.0
+ CGS = 8p
+ CGD = 7.5p
+ PB = 0.5
+ FC = 0.5
+ KF = 87.5E-18
+ AF = 1
+ M = 0.6
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