Patent ID: 8072828

Claim:
A semiconductor device having a single-ended type amplifier coupled to a bit line, the amplifier comprising: a first MOS transistor supplying a predetermined voltage to the bit line and switching connection between the bit line and a sense node in response to a control voltage applied to a gate thereof; a second MOS transistor having a gate connected to the sense node and amplifying a signal transmitted from the bit line via the first MOS transistor, a first voltage setting circuit setting the bit line to a first voltage in response to a first control signal; and a second voltage setting circuit setting the sense node to a second voltage in response to a second control signal, wherein after the bit line is set to the first voltage and the sense node is set to the second voltage, the bit line is driven in a charge distributing mode via the first MOS transistor so that a signal voltage at the sense node is amplified by the second MOS transistor.