Multisim: LT1568 Spice modell, AC simulations

Hi,
I'm building an input stage to an ADC, and need to do some signal conditioning before sampling. I'm thinking of using LT1568 for Low-Pass filtering, but when doing simulations in Multisim 13.0 I'm not getting the results I'm expecting.
I've provided my schematic, which is configured as a 4-pole LP filter with cut-off frequency at 5 MHz. When simulating it act's as a HP filter for some reason..
I've tried LTSpice and everything works fine, and I've contacted LT (Linear Technology) to get help but they suggest me to stick with LTSpice, which is not ideal for me.
I tried to make my own spice-model from code/description I found on the internet but with no success. Perhaps due to limited knowledge of spice.
Attached is the schematic
Thanks in advance
Sebastian
Solved!
Go to Solution.
Attachments:
1568.ms13 ‏126 KB

Try this.
Attachments:
1568_fixed.ms13 ‏164 KB

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I have established a model about APEX PA78, but the simulation reports some error, please help me!
Spreadsheet view report is followed:
------ Checking SPICE netlist for PA78 - 2010-01-28 20:12:00 ------
SPICE Netlist Error in schematic RefDes 'u2', element 'xu2': Unexpected '15' found on subckt instance line - too many nodes or parameter value missing name.
SPICE Netlist Error in schematic RefDes 'u2', element '<unknown>': Due to errors, the subckt instance 'xu2' has been omitted from the simulation
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======= SPICE Netlist check completed, 4 error(s), 0 warning(s) =======
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PA78U_B.pdf is data sheet about PA78 from
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PA78.ms10 is a bridge-connected configuration, but PA78 itself don't run a simulation.
帖子被Fangel在 01-28-2010 06:38 AM
时编辑过了
Solved!
Go to Solution.
Attachments:
PA78.TXT ‏7 KB
PA78U_B.pdf ‏820 KB
PA78.ms10 ‏139 KB

Hi,
I'll expand a little on what Angela said about the .ENDS, and then try to clear up the pins.
The SPICE model that you are using for the PA78 includes several subcircuits and models. Best practice for creating a component in Multisim is to have only a single .SUBCKT or .MODEL per component. The point of this is to make sure that any additional subcircuits or models are contained so that they don't interfere with each other in the final netlist. The easiest way to fix this is to move the .ENDS for the main subcircuit to the end of the entire block - so instead of just adding the .ENDS at the end, you would need to also remove the first .ENDS line in the file. For this circuit, you probably don't need to do that, however in general it's a good idea to do it when making a component like this.
As for the pins, step 6 of the Component Wizard is asking you for the order that the pins will be used in the model. The (original) model you have only has 10 nodes, so it's not a problem if you only have 10 pins there. If you have 12 pins on your symbol, and only 10 model nodes, then you just mark the two unused pins as "NC"(you can also add two "fake" pins to the .SUBCKT which is what you did, but you don't have to).
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The comments telling you the pinout order are telling you the order that the pins must be listed when using the PA78 .SUBCKT. As you can see from the .SUBCKT line and comments, even though IL is pin 1 on the component, it actually needs to be listed third when using the .SUBCKT. That's what Step 6 in the Component Wizard is asking you for. Step 6 lets you tell Multisim the order in which to use the pins. The comment tells you that +IN is model node 1, -IN is model node 2, IL is model node 3, etc, and then you tell Multisim this by setting the model node numbers
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Message Edited by yyao on 01-27-2009 01:02 PM
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+   -6.000 ,   -2.360
+   -5.000 ,   -2.360
+   -4.000 ,   -1.800
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+ x_array [-6.000 -5.000 -4.000 …..]
+ y_array = [ -2.630 -2.360 -1.800 ….]
3.                  You need to remove the some commas in the model
Original model:
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Change to:
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4.                  There are several duplicate subckt names declared and you should make them unique. I simply added an extra number at the end.
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RS-485.zip ‏82 KB

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Like I told another user I am no expert on model files. I have tried this file and Multisim will not recongnize it. I would recommend the following procedure if you can do it. Go into the component wizard and create a default Mosfet Using the Model Makers.. This will give you the correct syntax for the model file that Multsim can understand. If you know what the parameters mean from Pspice file then you can edit the model after it is created for you in Multisim and plug the numbers into it from the Pspice file. This should create a model that would work in Multisim. This procedure is theoretical on my part and you would have to try it to see if it works for you. It is possible that you don't have the Model Makers depending on your version of Multisim. If that is the case then we will have to try another approach.
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Message Edited by lacy on 11-11-2007 07:40 AM
Kittmaster's Component Database
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Message Edited by NatashaB on 03-05-2010 01:35 PM
Natasha Baker
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*REVISION 2 18-MAR-2002
*REDUCED INTERACTION OF SLEW RATE WITH CHANGING SUPPLY.
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* PINOUT ORDER +IN -IN OUT +VB -VB +VS -VS
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J1 10 1 8 JI1
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R4 12 9 1.34E+03
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C1 12 5 5.00E-13
R5 12 5 5.45E+06
R1 4 10 1.59E+03
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.ENDS
Solved!
Go to Solution.

Here goes the netlist. OOPS the netlist is more than 10000 characters so I attached a word document if that helps. Thanks
Attachments:
Multisim Apex PA50.doc ‏29 KB

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Multisim: LT1568 Spice modell, AC simulations

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