| 摘要 |
The bit line overdrive circuit of the present invention comprises a VBLH potential generation circuit generating a bit line final potential relative to a VBLH power supply line for driving a sense amplifier, a charge adjusting capacitance C, a transistor for supplying an overdrive potential to the VBLH power supply line, and a transistor for connecting a PCS node to the VBLH power supply line. The charge pre-charged from the overdrive potential to the VBLH power supply line is shared among the capacitance of the above-noted circuit elements connected to the VBLH power supply line, the bit line capacitance, and the capacitance of a cell capacitor so as to form a VBLH power supply of a substantially one system, thereby avoiding the generation of a power supply noise caused by the power supply switching.
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