Patent ID: 6114881
Filing Date: 2000-09-05
Classification: G11C

Abstract:
A current mirror type sense amplifier, comprising:a first current mirror type sense amplifying unit for primarily sensing and amplifying a voltage difference between an input signal and an inverted input signal, in response to a first sense enable signal, wherein said first current mirror type sense amplifying unit has a pull-down level elevating unit for elevating a level of a pull-down node, said pull-down level elevating unit including a plurality of NMOS transistors, whose drain-source paths are coupled in series between the pull-down node and a ground and whose gates are applied with a power voltage;a second current mirror type sense amplifying unit for primarily sensing and amplifying the voltage difference between the inverted input signal and the input signal, in response to the first sense enable signal;a third current mirror type sense amplifying unit for sensing and amplifying a voltage difference between output signals of said first and said second current mirror type sense amplifying units in response to a second sense enable signal, said second sense enable signal being activated in a predetermined time after said first sense enable signal is activated;a first precharging unit for precharging output nodes of said first and said second current mirror type sense amplifying units in response to the first sense enable signal;an equalizing unit for equalizing the output nodes of said first and said second current mirror type sense amplifying units in response to the first sense enable signal; anda second precharging unit for precharging an output node of said third current mirror type sense amplifying unit, in response to the second sense enable signal.