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OPA855: OPA855 Circuit Analysis and Debugging 2

Part Number: OPA855


Please see 

OPA855: OPA855 Circuit Analysis and Debugging - Amplifiers forum - Amplifiers - TI E2E support forums

Can you confirm that you are driving the input with a 50 ohm impedance input source? If the input source has a different impedance, the input will not be properly matched and you will see reflections that will result in distortion or instability.

--> Yes, I am using function generator. Its output mentioned 50E.

Please see and confirm its OK.