Yang, JinkunJinkunYangXu, PengbinPengbinXuZhuang, HaoyuHaoyuZhuangHe, WeipengWeipengHeHe, YajuanYajuanHeLi, QiangQiangLi2026-09-152026-09-152026-07-30IEEE Transactions on Circuits and Systems II Express Briefs 73 (9): 923-927 (2026)https://hdl.handle.net/11420/64859This brief presents an open-loop Gm-C dynamic amplifier with a high linearity and a high temperature and supply voltage stability. The main part of the amplifier employs two asymmetric differential pairs to enhance the transconductance linearity. The amplifier maintains a nearly constant gain of 23.29 dB within a differential input range of −40 to + 40 mV, and achieves a total harmonic distortion (THD) of −70.42 dB. Both the THD and voltage gain are better than other open-loop linear amplifiers, demonstrating that the proposed circuit offers an improved linearity and amplification capability. In addition, its input-referred noise (IRN) is 2.46 nV/ √Hz, lower than that of similar linear amplifiers. The biasing circuit of the amplifier adopts a constant-gm biasing circuit, which improves the temperature and supply voltage stability of the amplifier transconductance and voltage gain. When the differential input is 1 mV, the power supply voltage variation is ±10% around 5 V, and the temperature variation is −40 to + 120 + C, the standard deviation of voltage gain is 0.25093, and the range of voltage gain is from 13.99 to 15.05 times, indicating a better stability compared to the traditional Gm-C amplifiers.en1558-379120269923927IEEEGm-C dynamic amplifierhigh-linearityhigh-stabilityPipelined ADCresidue amplifierTechnology::620: EngineeringJournal Article10.1109/TCSII.2026.3718428