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OPA690 - Spice model doesn't work

Annael Torres
Prodigy 50 points
Other Parts Discussed in Thread: OPA690, TINA-TI

Hi everyone,

 

I'm currently trying to use the OPA690 Spice model  in Altium Designer 2004 but it doesn't work. Altium accepts the model, no import errors of the model file but when I try to simulate the result in incoherent. As if the amplifier was not working or supplied.

Could anyone help me?

Thanks.

 

Regards,

  • 0
    TI__Genius 17905 points

    Hi Annael,

    Issues with Spice models are handled by our eLab group. I am moving this thread to their forum. As a first debug step, can you please post a screenshot of your simulation schematic showing the OPA690 connections? Also, sometimes the last lines of code are truncated while importing. Please verify that the following lines of code appear after the line '.ENDS OPA690' in the imported model.


    .ENDS    OPA690

    .subckt OPA690_F9 1 2 3 4 
    F_F9         3 4 VF_F9 1.00
    VF_F9         1 2 0V
    .ends OPA690_F9

    .subckt OPA690_F10 1 2 3 4 
    F_F10         3 4 VF_F10 1.005
    VF_F10         1 2 0V
    .ends OPA690_F10

    .subckt OPA690_F3 1 2 3 4 
    F_F3         3 4 VF_F3 0.95488521596
    VF_F3         1 2 0V
    .ends OPA690_F3

    .subckt OPA690_F4 1 2 3 4 
    F_F4         3 4 VF_F4 0.98695305877
    VF_F4         1 2 0V
    .ends OPA690_F4

    .subckt OPA690_F6 1 2 3 4 
    F_F6         3 4 VF_F6 2.6438181
    VF_F6         1 2 0V
    .ends OPA690_F6

    .subckt OPA690_F5 1 2 3 4 
    F_F5         3 4 VF_F5 2.574605
    VF_F5         1 2 0V
    .ends OPA690_F5

    .subckt OPA690_F1 1 2 3 4 
    F_F1         3 4 VF_F1 2.574605
    VF_F1         1 2 0V
    .ends OPA690_F1

    .subckt OPA690_F2 1 2 3 4 
    F_F2         3 4 VF_F2 2.528519
    VF_F2         1 2 0V
    .ends OPA690_F2

  • 0 in reply to Kris F
    Prodigy 50 points

    I've check my model and it's not truncated, all those lines are still present.

    Here is my schematic:

  • 0 in reply to Annael Torres
    TI__Genius 9775 points

    Annael,

     

    We tried your schematic with out TINA-TI and it works alright.

    Attached is the file. Just in case you don't use TINA-TI, you can download it for free at the following link

    http://focus.ti.com/docs/toolsw/folders/print/tina-ti.html

    3487.opa690.TSC

     

    Since I am not familiar with Altium Designer 2004, I am not sure what might cause your problem and not sure how to help you. 

    All being said though, could we do several things so that I can help you further:

    1. From your schematic picture, I am not really sure if pin 2 is gnd or VCC. Could you double check your pin connection just to make

       sure that you don't flip VCC and GND etc etc.

    2. When you run operating point (dc bias) what is the quiescent current coming out of the amplifier?

    3. Could you post the output response of the test bench you attached?

     

    If everything is correct on your connections etc etc, I am suspecting that there is incompatibality between pspice/tina and Altium. 

     

    Herman

  • 0 in reply to Herman Theodorus
    Prodigy 50 points

    Hi everyone,

     

    it seems that the problem was from my version of Altium. I tested the same schematic with Altium 6 and it worked.

    Thanks for your support.

    Regards,