OPA1622: TINA Simulation Phase Margin VS Capacitive Load

Amy Luo

Part Number: OPA1622

Hi team,

I downloaded the OPA1622 model on TI's website and used TINA TI to simulate the phase margin at different capacitive loads and found the simulation results to be inconsistent with the datasheet curve.

According to the data sheet, the connections are as G=1, 1nf//2K loads, as follows:

OPA1622 phase margin.TSC

Under different capacitive loads, the simulation phase margin is not correct, both are 25° different.

Could you please confirm if the OPA1622 spice model is abnormal or the curve in the datastore is wrong? Thank you.

Best Regards,

Amy

over 1 year ago

0 Chris Featherstone over 1 year ago

TI__Mastermind 23935 points

Hey Amy,

I have attempted an alternative approach that includes the input impedance when breaking the loop. I obtained similar results to your simulation. I will need more time to investigate this in order to see what the issue may be. I will discuss this with our team and respond within 2 business days.

3225.OPA1622.TSC

Best Regards,

Chris Featherstone

0 Amy Luo over 1 year ago in reply to Chris Featherstone

TI__Expert 6895 points

Hi Chris,

Thanks for looking into. If there is any progress, let me know, thanks.

Best Regards,

Amy

0 Chris Featherstone over 1 year ago in reply to Amy Luo

TI__Mastermind 23935 points

Hey Amy,

I checked the data with the validation team and the data they collected matches the pds curve. I will consult with one of our model experts to see if we can track down the discrepancy.

Best Regards,

Chris Featherstone

0 Amy Luo over 1 year ago in reply to Chris Featherstone

TI__Expert 6895 points

Sorry for pushed, any update on here?

0 Chris Featherstone over 1 year ago in reply to Amy Luo

TI__Mastermind 23935 points

Hey Amy,

I would like to take this off of the public forum and to email. I will email you shortly.

Best Regards,

Chris Featherstone

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OPA1622: TINA Simulation Phase Margin VS Capacitive Load