Tongyu Song Zhiheng Cao Shouli Yan A 2.7mW 2MHz Continuous-Time ΣΔ Modulator with a Hybrid Active-Passive Loop Filter. 57-60 2006 CICC https://doi.org/10.1109/CICC.2006.320963 conf/cicc/2006 db/conf/cicc/cicc2006.html#SongCY06