Community
Fusion Electronics
Working an electronics project and need help with the schematic, the PCB, or making your components? Join the discussion as our community of electronic design specialists and industry experts provide you their insight and best practices.
cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Issue including z diode model

1 REPLY 1
Reply
Message 1 of 2
demariano95
435 Views, 1 Reply

Issue including z diode model

Hi. I am trying to simulate a circuit using Fusion 360. My circuit incorporates a zener diode (namely bzx84c5v1). 

I found a spice model for this zener diode online:

 

*src=BZX84C5V1;DI_BZX84C5V1;Diodes;Zener <=10V; 5.10V  0.350W   Diodes Inc. 
*SYM=HZEN
.SUBCKT DI_BZX84C5V1  1 2
*        Terminals    A   K
D1 1 2 DF
DZ 3 1 DR
VZ 2 3 2.74
.MODEL DF D ( IS=28.3p RS=33.9 N=1.10
+ CJO=66.2p VJ=0.750 M=0.330 TT=50.1n )
.MODEL DR D ( IS=5.65f RS=44.5 N=3.00 )
.ENDS

 

I am no expert on SPICE and I don't really know how this work or even if it is correct or not. However I don't even have the opportunity to find out by myself since I can't run the simulation. I am getting this error:
missing subckt.png

I had just saved the mapping and model but still am unable to simulate. I didn't find anyone having this issue in the forum but maybe I just didn't use the right search keywords.

Also, maybe I'm just really dumb but I cannot for the life of me find an independent voltage source in the Add Part menu. I need it for the DC Sweep simulation, but it's just nowhere to be found.

 

Any help regarding either of these issues would be much appreciated.

1 REPLY 1
Message 2 of 2
panpan_fan
in reply to: demariano95

Hi @demariano95 

I hope you are doing well!

For your questions,  here are my answers:

1. For 'Missing SUBCKT...' warning message, can you please try to put the mdl file in the ~/Documents/Fusion 360/spice directory? Simulation will look there for additional models.

2. For fail to find the independent voltage source, you can try the following steps:

In Add Part Dialog -> Click Open Library Manager icon -> In Library Manager dialog -> Switch tab to Available -> Search with 'ngspice' key word to find the ngspice-simulation library -> Select it and Click Use -> Then you can find the independent voltage source in the ngspice-simulation library

Screen Shot 2020-09-18 at 3.23.34 PM.png

Screen Shot 2020-09-18 at 3.30.22 PM.png

I hope my answers can solve your problem. If you still have other problems, please leave your comment, thanks!

 

Regards,

Panpan Fan

Tags (1)

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Autodesk Design & Make Report