04-15-2007 10:08 AM
04-19-2007 09:49 AM
05-26-2007 10:36 AM
05-28-2007 04:12 PM
Hi, the LM311 was not included in the Education edition because of a wrong tag in the Multisim database, it made it available only to the Professional editions. After being notified from this and other threads in the discussion forums, R&D has fix this and the next update (Summer 2007) will change this behaviour and therefore make it available in the Education edition.
In the meantime, attached you will find the PRZ file and a Multisim 10 file. Double-click on the PRZ file to include the component in your user database, and you can use the Multisim 10 file to see how it behaves. I took a test circuit from the TI datasheet to test it and it seems to be working fine.
For any person using a version older than v10, you can create a custom component with this spice code:
* LM311 VOLTAGE COMPARATOR
* CONNECTIONS: NON-INVERTING INPUT
* | INVERTING INPUT
* | | POSITIVE POWER SUPPLY
* | | | NEGATIVE POWER SUPPLY
* | | | | OPEN COLLECTOR OUTPUT
* | | | | | OUTPUT GROUND
* | | | | | |
.SUBCKT LM311 1 2 3 4 5 6
F1 9 3 V1 1
IEE 3 7 DC 100.0E-6
VI1 21 1 DC .45
VI2 22 2 DC .45
Q1 9 21 7 QIN
Q2 8 22 7 QIN
Q3 9 8 4 QMO
Q4 8 8 4 QMI
.MODEL QIN PNP(IS=800.0E-18 BF=500)
.MODEL QMI NPN(IS=800.0E-18 BF=1002)
.MODEL QMO NPN(IS=800.0E-18 BF=1000 CJC=1E-15 TR=102.5E-9)
E1 10 6 9 4 1
V1 10 11 DC 0
Q5 5 11 6 QOC
.MODEL QOC NPN(IS=800.0E-18 BF=103.5E3 CJC=1E-15 TF=11.60E-12 TR=48.19E-9)
DP 4 3 DX
RP 3 4 6.667E3
.MODEL DX D(IS=800.0E-18)
.ENDS
That spice code should fix it, if you have questions about how to create a custom component, follow the tutorial named "Creating a Custom Component in NI Multisim":
05-29-2007 10:41 PM