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    • 14. 发明公开
    • Method and circuit for characterising an integrated memory device
    • Verfahren und Vorrichtung zur Charakterisierung von integrierten Speicherschaltungen
    • EP0778585A1
    • 1997-06-11
    • EP96308680.6
    • 1996-11-29
    • TEXAS INSTRUMENTS INCORPORATED
    • Hashimoto, Masashi
    • G11C29/00G11C11/407
    • G11C29/028G11C11/401G11C11/4074G11C29/50G11C29/50016G11C2029/5004
    • In a dynamic random access memory device, the time required for implementation of memory cell data retention time testing procedures can be reduced by changing the voltage level(s) applied to the components 13, 14 of the storage cell when compared to the voltages applied during the typical memory cell operation. By changing the voltage(s) applied to the components 13, 14, the difference in the bitlines 1, 2 detected by the sense amplifier 9 will be reduced. Because to the reduced bitline voltage difference, the decay of the charge on the storage cell causes a reduction in the data retention time. The data retention time is reduced in manner related to the typical memory cell operation. The altered voltage(s) can be applied to the storage cell bitlines 1, 2 and/or to the storage cell dummy capacitances.
    • 在动态随机存取存储器件中,当与存储单元数据保持时间测试程序中施加的电压相比较时,可以通过改变施加到存储单元的组件13,14的电压电平来减少实现存储单元数据保持时间测试程序所需的时间 典型的存储单元操作。 通过改变施加到部件13,14的电压,由读出放大器9检测的位线1,2的差将减小。 因为对于降低的位线电压差,存储单元上的电荷的衰减导致数据保留时间的减少。 与典型的存储单元操作相关的方式减少数据保留时间。 改变的电压可以被施加到存储单元位线1,2和/或存储单元虚拟电容。