Patent ID: 7656721

Claim:
A semiconductor device, comprising a first sensor amplifier coupled between a first local data line and a first memory unit to amplify a signal of the first memory unit; a second sensor amplifier coupled between a second local data line and a second memory unit to amplify a signal of the second memory unit; a third sensor amplifier coupled to a middle data line to amplify signals of the middle data line; a first switch coupled between the middle data line and the first local data line to equalize voltage levels of the middle data line and the first local data line by turning on the first switch according to a first data control signal; a second switch coupled between the first local data line and a reference voltage to equalize a voltage level of the first local data line to the reference voltage by turning on the second switch according to a first local data control signal; a third switch coupled between the middle data line and the second local data line to equalize voltage levels of the middle data line and the second local data line by turning on the third switch according to a second data control signal; and a fourth switch coupled between the second local data line and the reference voltage to equalize the voltage level of the second local data line to the reference voltage by turning on the fourth switch according to a second local data control signal.