TINA-TI: Normalize closed loop gain graph

Olaf Wohlmann1

Part Number: TINA-TI
Other Parts Discussed in Thread: OPA818, OPA340

Hi,

I am doing some opamp simulations and i want to reproduce some plots from the datasheet. However in most cases the closed loop gain plots use normalized y axis to show multiple plots. How can i normalize the y axis in TI-TINA?

Regards

over 5 years ago

0 Ed Walker over 5 years ago

Prodigy 5 points

Hello Olaf Wohlmann1,

Thank you for your inquiry about TINA. Since TINA is a DesignSoft/TINA program, questions are handled by using the DesignSoft support page: http://www.tina.com/technical-support/ .

The DesignSoft/TINA team is very helpful and this is the most direct way for TINA support. Please advise by Reply when the issue has been resolved.

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi Olaf,

can you show an example?

Kai

0 Olaf Wohlmann1 over 5 years ago in reply to kai klaas69

Prodigy 240 points

Hi,

I want to reproduce some diagrams of the OPA818 datasheet, for example pg. 8 figure 2.

0 kai klaas69 over 5 years ago in reply to Olaf Wohlmann1

Guru 140200 points

Hi Olaf,

this here is the simplest method :-)

olaf_normalized_curves.TSC

Kai

0 Olaf Wohlmann1 over 5 years ago in reply to kai klaas69

Prodigy 240 points

Hi,

Thanks for your support. I have attached an example schematic provided by Designsoft which shows another approach based on parameter stepping in parallel stepping mode.

Regards

2021_Jan_15_OPA340_Norm_Gain_Test_Circuit.TSC

0 kai klaas69 over 5 years ago in reply to Olaf Wohlmann1

Guru 140200 points

Hi Olaf,

yes, the "Select control object" method is also very powerful. And there's still the method of post-processing, briefly discussed here:

Kai

0 Olaf Wohlmann1 over 5 years ago in reply to kai klaas69

Prodigy 240 points

Hi,

Again, thanks for your excellent support.

0 Michael Steffes over 5 years ago in reply to kai klaas69

Guru 48395 points

nice trick Kai, the other way along this line is to follow each output with a dependent voltage source set to the right attenuation to get 0dB in each channel,

0 Michael Steffes over 5 years ago in reply to Olaf Wohlmann1

Guru 48395 points

Well Olaf, I was interested in that parameter stepping and was able to get that to work in TINA V9 for the OPA818 - here I modified that OPA340 example to create figure 1 in the datasheet, V9 file below, the inverting sweep in Figure 2 does not report Rvalues?? I should have changed the load to 100ohm, doing that the curves don't change much - also, the OPA340 example should have used +/-2.5V supplies.

Here is the file,

OPA818 Figure 1 gain stepping.TSC

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TINA-TI: Normalize closed loop gain graph