Hi Esakki, The spurious is coming from the signal generator. Please use a bandpass filter on the output of the sig gen, I would connect it close to the EVM. Setup should be as follows: Sig gen-cable-BPfilter-EVM If you need a reference for testing HSADCs, please see link: https://www.analog.com/media/en/technical-documentation/app-notes/an-835.pdf Page 11. Regards, Rob
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