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comparator
https://www.cadence.com/content/dam/cadence-www/global/en_US/videos/tools/custom-_ic_analog_rf_design/NoiseAnalyisposting201612Chalk%20Talk.pdf
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5437496
https://zhuanlan.zhihu.com/p/279111199