The descriptions of "noise shaping" in Sigma-Delta ADCs always bugged me; how and why is the noise pushed up into higher frequencies? This block diagram shows it easily. At f ➡️ 0 the signal term goes to X and the noise term goes to 0. At high f it is the opposite. Effectively it is a low pass on the signal and a high pass on the noise. https://til.maroukis.net/attachments/TIL---Sigma-Delta-ADCs-1739277561096.jpeg More at: https://til.maroukis.net/The-black-magic-of-noise-shaping-in-Sigma-Delta-ADCs #electronics #dsp #engineering #signalprocessing