A new low-voltage and high speed sense amplifier based on very simple direct current-mode comparison is presented.It adopts low-voltage reference cell current generator implemented through using resistor mirror instead of traditional transistor mirror to avoid threshold voltage drop of the transistor mirror thus reducing voltage supply of sense amplifier.The use of operation amplifier in control circuit of bit-line voltage reduces voltage variation due to the variation of temperature and process corner

thus enhancing access precision.The proposed sense amplifier is designed in SMIC (Semiconductor Manufacturing International Corporation) 90nm process and the sense time is 14.7ns at power supply of 1.2V.Meanwhile

the current power of single sense amplifier is optimized by 13% over conventional structure.