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THS4520: Phase Margin Simulation Questions

Part Number: THS4520

I have been trying to simulate the stability of a customer’s design and the phase plot in TINA registers (-) numbers (-100 on the phase portion of the graph). This would seem to indicate that the THS4520 is not stable at the customer’s operating point, but I am not sure if this is correct in that the THS4520 is a fully differential amplifier. The scope shots do not indicate any instability. I am just trying to understand why the Phase portion of the graph is shown in (-) negative number. Is this just an indication that the application is very unstable? I can email you the TINA simulation if you need to look at it once I know who is looking at this issue.

Thanks for your help with this!

Richard Elmquist