A 4.5 GΩ-Input Impedance Chopper Amplifier With Embedded DC-Servo and Ripple Reduction Loops for Impedance Boosting to Sub-Hz.
Xuan Thanh PhamDuc Nha DuongNgoc Tan NguyenVan Truong NguyenJong-Wook LeePublished in: IEEE Trans. Circuits Syst. II Express Briefs (2021)