| 摘要 |
PURPOSE:To make it possible to manufacture a dymmy cell part easily in terms of layout by constituting capacitors of dymmy cells by coupling two capacitors of similar levels to those of dynamic cells in series. CONSTITUTION:Capacitors of dymmy cells are composed of two capacitors CD1 and CD2 connected in series. Each capacitor should be of substantially the same constitution with capacitor Cs of a one-transistor one-capacitor type MOS dynamic cell. Consequently, the capacity of the capacitor of the dymmy cell is reduced to a half that of capacitor Cs, providing the same operation with a conventional circuit. Further, since capacitors CD1 and CD2 have the same constitution with capacitor Cs, there is no trouble in terms of a pattern. Here, the area occupied by capacitors is a little in increase rate on the whole because several tens cells for one dymmy cell 1 are generally used on either right and left side of sense amplifier 11. |
