• State Resolved
  • Locked Locked
  • Replies 10 replies
  • Answers 1 answer
  • Subscribers 49 subscribers
  • Views 2138 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

OP07: TINA-TI : Differentiator Integrator with Precision Rectifier :

Karan123
Intellectual 510 points
Part Number: OP07
Other Parts Discussed in Thread: TINA-TI, , LM324, TIDA-00777

Hi,

Where I can find example(s) in TINA-TI of

1) Differentiator (with OP07) - Input AC

2) Integrator  (with OP07 )    -  Output AC

3) Precision Rectifier (with LM324)    -  Rectified AC.

I need to combine all as per my requirement..

--

Karan

  • 0
    Guru 140200 points

    Hi Karan,

    can you post a schematic?

    Kai

  • 0 in reply to kai klaas69
    Intellectual 510 points

    Hi,

    Thanks..

    I have only block diagram.

    --

    Karan

  • 0 in reply to kai klaas69
    Intellectual 510 points

    Hi,

    Below Is the Block diagram

    nks

    Thanks..

  • 0 in reply to Karan123
    Guru 140200 points

    Hi Karan,

    what is the purpose of differentiator and integrator? Or is it just another name for high pass and low pass filtering? Tell a bit more about your application, please.

    Kai

  • 0 in reply to kai klaas69
    Intellectual 510 points

    Hi,

    1) what is the purpose of differentiator ?

    "Just use as Dummy of Rogowski coil"

    2) And integrator ?

    To retrieve original AC . Below is Input to integrator (Actual Output of Rogowski coil ).

    Tell a bit more about your application, please.

    I want to simulate as above.

    Thanks for your concern.

    --

    Karan

  • 0 in reply to Karan123
    TI__Prodigy 715 points

    Hi Karan,

    We don't necessarily have TINA files for each particular op-amp in each particular configuration.  That said, TI has plenty of material published on amplifier circuits such as differentiators, integrators, rectifiers, filters, etc.  However, I'm confused as to what you are trying to achieve.  It sounds like you plan to use a differentiator to model a Rogowski coil?  And then your actual circuit you're trying to design is the integrator and precision rectifier?  Are you married to using the OP07 for the integrator and the LM324 for the rectifier?  I saw your other thread asking for an alternative for the OP07, hence my question.  The choice of amplifier depends on many factors, from available power supplies, allowable current consumption, required bandwidth, output drive requirements, etc etc.  If you can help clarify how TI can best help you, we can link you to the most appropriate resources available.

    Thanks,

    Scott

  • 0 in reply to scottgulas
    Intellectual 510 points

    Thanks for update...

    Yes I am trying to achieve differentiator model for Rogowski Coil    .

    Yes, You are right  .

    OP07 and LM324 not necessarily to use.

    I prefer, due to ease of availability.

    TIDA-00777 have some integrator circuit but doesn't have differentiator model of rogowski coil.

    --

    Karan

  • 0 in reply to Karan123
    TI__Prodigy 715 points

    Karan,

    I think the following links should be useful for the variety of circuits, from the differentiator to the integrator to the rectifier.

    https://www.ti.com/lit/an/sboa092b/sboa092b.pdf

    https://www.ti.com/lit/an/snoa621c/snoa621c.pdf

    https://www.ti.com/lit/an/snla140c/snla140c.pdf

    And for the most details of a circuit, you'll find the circuit cookbooks to be very useful

    https://www.ti.com/lit/an/sboa276b/sboa276b.pdf  Differentiator

    https://www.ti.com/lit/an/sboa275a/sboa275a.pdf  Integrator

    Here's the whole list of cookbook circuits, which we continue to add to.

    https://www.ti.com/design-resources/design-tools-simulation/analog-circuits/amplifier-circuits.html 

    In the end if you need help selecting the best op-amp for your particular application, let us know.  

    Thanks,

    Scott

  • 0 in reply to scottgulas
    Intellectual 510 points

    Thanks for update and links . 

    I am bit confused about working Rogoswski Coil ...

    1) It means Rogowski_coil gives square wave (before  differentiator)  then sharp pulses   (After  differentiator) as per below link.

    as per DSO screenshot .

    2) Then Integrator will change to Sin wave from spike  ?

    --Karan

    https://en.wikipedia.org/wiki/Rogowski_coil

     .

  • 0 in reply to Karan123
    TI__Prodigy 715 points

    As your Wikipedia article states "Since the voltage that is induced in the coil is proportional to the rate of change (derivative) of current in the straight conductor, the output of the Rogowski coil is usually connected to an electrical (or electronic) integrator circuit to provide an output signal that is proportional to the current."  So in the sboa276b image you shared, the impulse function (Vout) is the derivative of the square wave (Vin).  So if your current monitored by a Rogowski coil were a square wave, you'd see this pulse and decay waveform out of the coil (approximated by a differentiator circuit).  At the end of the day, you need to integrate the output of the Rogowski coil to recreate the AC waveform.  Since the coil acts as a differentiator, it has no response to DC current, and therefore that information is lost.  

    Thanks,

    Scott