Abstract: A linear programmable hysteresis voltage comparator is proposed. The feedback structure is added to the output port of the comparator. By controlling the number of feedback current branches, the comparator has linear controllable hysteresis voltage within the design range, making it possible that the optimal combination of anti-noise and reaction speed can be realized in different application environments, which solves the requirement of linear programming hysteresis voltage in the process of high-speed testing. The hysteresis voltage linear programmable comparator circuit is implemented in 40 nm Complementary Metal Oxide Semiconductor(CMOS) technology. The simulation results show that under the conditions of 3.3 V working voltage, 27 ℃ ambient temperature and tt process angle, the maximum power consumption of the circuit is 102.4 μW, the transmission delay is 10 ns, and meanwhile, when the number of compensation currents is 2 to 6, the linear control effect of hysteresis voltage is the most obvious.