Mystery Spur Explained: Don’t Blame the DDC!

Q. I recently witnessed some “strange” behavior while evaluating the output spectrum one of your high-speed ADCs that incorporates a digital down converter (DDC) function. Can you explain the existence of a mystery spur? A. The DDCs include a decimation filter, which allows you to avoid traditional input anti-aliasing filtering requirements, and yet digitally filter out the baseband signal of interest with a net lower payload of data to process.

Read the source article at Planet Analog

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