Abstract: In order to solve the problem of processing 1． 2 V digital signal in LVDS( Low Voltage Differential Signaling) driver with 2． 5 V power supply，due to the poor performance of traditional level conversion circuit and the problem of bit error，an LVDS interface circuit for CMOS ( Complementary Metal Oxide Semiconductor)image sensor chip is designed． The digital circuit is powered by 1． 2 V and the LVDS driver is powered by 2． 5 V． This paper proposes two level shifting circuit schemes to solve this problem． In the first solution，hysteresis comparator is used as the level shifter． In the second solution，the 1． 2 V digital signal is level shifted first，then the D trigger is used to sampling the shifted signal and the error code will be avoided． TowerJazz 65 nm CMOS technological process is employed for tape-out verification． After the tests，the problem of LVDS driver error code can be efficiently solved by these two solutions．

Key words: complementary metal oxide semiconductor (CMOS) image sensor, low voltage differential signaling(LVDS) driver, level shifter