OPA1637: Simulation with TINA TI

ttd

Mastermind 8600 points

Part Number: OPA1637

Tool/software:

Dear Technical Support Team,

OPA1637 data sheet, product information and support | TI.com

https://www.ti.com/lit/tsc/sbomb87

How do I show the phase and gain graph attached?

Attached graph's label shows AOL. however I think it is circuit is closed loop gain.

Can I get to simulate result of phase and gain for closed loop gain(0dB buffer) circuit?

Since it is set to 0dB buffer, the closed loop phase margin of 0dB cannot be used to determine stability, so I guess it will have to be verified by the amount of ringing?

I tried to simulate AC analysis, however it seems to get same result.

Best Regards,

ttd

1 month ago

0 Chris Featherstone 1 month ago

TI__Mastermind 25285 points

Hello,

We have an in depth free video training series on how to perform this analysis that can be found here under the stability section.

Precision labs series: Fully differential amplifiers

I have included my Tina Ti file with the stability method we use to break the loop and separate the Aol, 1/beta, and loop gain parameters. The video along with my simulation should guide you on the understanding of how to break the loop and perform this analysis. Below you can see the phase margin is 70 degrees. I hope this information is helpful. 8321.OPA1637_filter_stability.TSC

Best Regards,
Chris Featherstone

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OPA1637: Simulation with TINA TI