THS3201 import issue

Hi Ajay,

This is line 138 of the model file THS3201.lib:

Gout 3 4 value={limit(V(5,6)/12.4,0.88,-0.88)*limit(I(v1),IL,-IL)} ;

Based on the error message, my guess is that ADSsim does not understand the function "limit".

I don't have ADS right now, my suggestion is to take a look at the PSPICE manual to understand the syntax of this function, then find an equivalent that ADSsim supports.

REgards,
JC

Hi,

The limit function PSPICE has to be replaced by "if then" in ADS. I tried it once. It didn't work. Will try again.

Thanks for the reply

Regards,

Ajay

Hi John,

I tried replacing the limit function with the if then in ADS but I failed to do so. After statement replacement I can simulate without errors but I don't get desired results. So, I guess what I'm doing is not right. If you could post the solution, it would be appreciated.

Thanks,

Ajay

Sure john.

Hi, 

I try to import THS3201 PSpice model into ADS Agilent. Unfortunately translation is completed with warnings and errors, for example: 

WARNING Cannot locate pin or wire for connector HIZ at 52.000000 -15.500000 

WARNING Cannot locate pin or wire for connector VCC at 52.000000 -15.250000

Could you please advice how may I solve this problem.

Kate,

I am a modeling engineer in Analog eLab.

When you say "translation", does that mean when you import the netlist into ADS?

I tried importing the netlist, but did not get any error messages.

Regards,

John

Hi John,

Hi Kate,

I reported this problem before. Using the replacement function in 'cswii' block I could get the simulations going but I've not verified if the results concur with the datasheet.

Now I'm working with THS3202 and it has a similar issue. I replaced the 'limit' function by 'if else' statement. The simulations go through fine but the results do not match the datasheet. 

for ex. if I simulate a circuit to get a non-inverting gain of 5, I get a gain of 1. the gain never changes. The same circuit works fine in TINA. i.e. the circuit is fine but the replacement function seems to have a problem.

John, if you could confirm the working of the model with the replacement function, it would be very helpful (Also for THS3202).

Regards,

Ajay

Dear John,

Kate,

I can't comment on the model but it does give the proper gains in TINA. I am a Mac user too and TINA-TI runs just fine using CrossOver or in a virtual machine - I use Virtualbox for this. I actually use both solutions - CrossOver is nice because it doesn't need a Windows license to use (although the product is not free) and its windows are more Mac-like. Virtualbox is nice because it's free (although you need a Windows license to install Windows in it) and it has that Windows look (it's how I generate videos and screenshots for our TINA-TI documentation).

Kate,

I will be glad to troubleshoot the model in ADS, but some useful results will most likley take until the end of the week.
Is this time frame aceptable?

If this time frame is okay, some additional information that will help:

1. Which version of ADS are you using?
   - We have only limited access to ADS versions before 2009.
2. Which operating system do you use for ADS?
3. What circuit configurations will you use in your simulations?
   - Inverting/non-inverting gain, power supplies, resistor values, load resistance?
   - Is it possible to share your  schematics that show the THS3201 circuit configurations?
4. What type of simulations will you be doing with the model?
   - Spice-type transient/AC/DC sims or some of the other ADS sim modes like s-parameters?

Thank you for your patience.

Regards,

John

John,

Same kind of modification for the model THS3202 doesn't work. I'm using ADS 2009. Would you be able to check at your end? If you want me to, then I can create a separate thread for this problem.

Regards,

Ajay

Thanks John.

End of week is OK.

If you look at the following discussion, Kristofer Flares suggest me a circuit which is implemented in TINA. If I try to do the same in ADS I get no gain at all from the op-amp. May be you can use this as a reference. I suspect some issue with the version of ADS. May be you can tell

http://e2e.ti.com/support/amplifiers/high_speed_amplifiers/f/10/p/113201/405453.aspx#405453

Regards,

Ajay

Hi John,

Thanks a lot.. The workspace doesn't work in ADS 2009/2008.. I don't have access to 2011 right now. I can try this may be in couple of days and will let you know how it went.

Regards,

Ajay

Hi John,

I did verify on ymsystem. I workd fine. I cannot use the workspace in ADS versions below 2011.

I still couldn't figure out why the same changes to cswii block doesn't work in ADS 2008/2009. If you ever do project files for ADS2008/2009, do upload them here..

Thanks for the support.

Regards,

Ajay

Hi John,

If possible could you please upload the project files compatible for ADS2009? Some of the models (non TI) in my design are not compatible with ADS2011 and I've to use ADS-2009. 

Thanks

Ajay

Hi John,

Don't worry about it. I've it working in my setup.

Thanks

Ajay

sir, 

In ADS, in UWB transceiver , i have taken away the input signal and gave a ecg signal as input. but i have some problems reading the data file.

error detected during netlist flattening

while eveluating epression c1.level, expression has not been defined.

unresolved reference :

DAC1.

 please help me to rectify error.

Dheepika,

Would you please upload the ADS project/wprkspce to this thread?
The error might be associated with your signal source. I cannot reproduce the error with the standard test circuit.

Regards,
John

its a simple data file reading schematic. but am getting errors as dac1 unresolved reference. and error occured during netlist flattening. while evaluating expression c1.level expression undefined.

.

i couldnt upload the file here. but i have mailed with that attachment. please have a look and  please reply me at the earliest sir.