| 摘要 |
PURPOSE:To improve noise due to capacitive coupling between bit lines by arranging a bit line belonging to other sense amplifier group between two bit lines connecting to a sense amplifier belonging to each sense amplifier group. CONSTITUTION:Either a drive signal phi1 or a drive signal phi2 only is active by a sense amplifier drive circuit at readout. Sense amplifiers 1, 3,... of a 1st sense amplifier group are driven when the signal phi1 is active, and suppose that a bit line the inverse of BL1 is noted, bit lines BL2, the inverse of BL2 adjacent thereto belong to a sense amplifier 2 of a 2nd sense amplifier group and the signal phi2 is in halt, they are preserved in the precharge state and act like shield wires. Thus, noise via a capacitor C1 is ignored and noise via a capacitor C2 is far smaller than that via the capacitor C1 thereby improving considerably noise caused between bit lines. |
