LOCAL INPUT AND OUTPUT SENSE AMPLIFIER OF SEMICONDUCTOR MEMORY DEVICE

摘要

A local input/output sense amplifier of a semiconductor memory device is provided to enhance sensing performance thereof by using a transistor having a low threshold voltage. A pair of local input/output lines include a local input/output line and an inversion local input/output line(LIO,LIOB). A pair of global input/output lines includes a global input/output line and a reverse global input/output line(GIO,GIOB). A first transistor includes a gate connected with the local input/output line. A second transistor has the same threshold voltage level as the threshold voltage level of the first transistor. A third transistor has a threshold voltage level lower than the threshold voltage level of the first transistor. A fourth transistor has a threshold voltage level lower than the threshold voltage level of the second transistor.