LTspice quad comparator

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Anestis88

Joined Aug 9, 2011
19
Hello
I want to use a model for LM2901 quad comparator. First I tried to use a general opamp2 and insert the subcircuit model but I got error about missing nodes. I assume that was because the model is for 4 comparators together. Then I tried to automatically generate the model (Right clik- 'Create Symbol') but the program shows an error regarding permission. I changed the restrictions at the C file for LTspice without any result.
Is there a way to use a single comparator with the same performance of LM2901. For instance, can I modify the model to account for a single comparator? or what can somebody suggest.
Thanks for any idea.

* LM2901 VOLTAGE COMPARATOR "MACROMODEL" SUBCIRCUIT
* CREATED USING PARTS VERSION 4.03 ON 03/14/90 AT 13:05
* REV (N/A)
* CONNECTIONS: NON-INVERTING INPUT
* | INVERTING INPUT
* | | POSITIVE POWER SUPPLY
* | | | NEGATIVE POWER SUPPLY
* | | | | OPEN COLLECTOR OUTPUT
* | | | | |
.SUBCKT LM2901 1 2 3 4 5
*
F1 9 3 V1 1
IEE 3 7 DC 100.0E-6
VI1 21 1 DC .75
VI2 22 2 DC .75
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=2.000E3)
.MODEL QMI NPN(IS=800.0E-18 BF=1002)
.MODEL QMO NPN(IS=800.0E-18 BF=1000 CJC=1E-15 TR=807.4E-9)
E1 10 4 9 4 1
V1 10 11 DC 0
Q5 5 11 4 QOC
.MODEL QOC NPN(IS=800.0E-18 BF=3.378E3 CJC=1E-15 TF=930.2E-12 TR=543.8E-9)
DP 4 3 DX
RP 3 4 50.00E3
.MODEL DX D(IS=800.0E-18)
*
.ENDS
 

eetech00

Joined Jun 8, 2013
1,934
HI

Try this LM2901Test.asc and LM2901.txt file.
I copied the subckt def from your post and placed it in a text file.
Usually there is just one opamp definition in the subcircuit file. If you want four, just insert or copy the first instance three more times.
 

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