Dynamic amplifiers are favored for the low power consumption feature in applications such as residual amplification, but the temperature-dependent gain variation limits their performance. In this paper, a temperaturecompensated common-mode voltage detector is proposed for dynamic amplifiers to maintain performance against temperature variation. The proposed method employs a power-saving negative temperature coefficient reference voltage generator, a switched-capacitor subtractor and a temperature-insensitive inverter based zero-crossing detector to alleviate gain variation. Simulation results show that the proposed method reduces the maximum gain variation from 16.0% to 2.2% in a wide temperature range from -40°C to 125 °C with a frequency-dependent power consumption of only 16.0uW at 250MHz in 40nm CMOS technology.