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    • 7. 发明申请
    • READ SENSING CIRCUIT AND METHOD WITH EQUALIZATION TIMING
    • 阅读感应电路和均衡时序方法
    • WO2012100255A1
    • 2012-07-26
    • PCT/US2012/022239
    • 2012-01-23
    • QUALCOMM INCORPORATEDKIM, Jung PillKIM, Tae Hyun
    • KIM, Jung PillKIM, Tae Hyun
    • G11C11/16
    • G11C7/08G11C11/1673
    • A Magnetic Random Access Memory (MRAM) includes read sensing circuitry having an equalizer device configured between a bit cell output node and a reference node of the bit cell. The equalizer is turned on to couple the output node to the reference node during an initial portion of a read operation and to decouple the output node from the reference node after an equalization delay period. A sense amplifier is enabled to provide a data output from the bit cell only after the delay period and decoupling of the output node from the reference node to provide balanced sensing speed of data represented by parallel and antiparallel state magnetic tunnel junctions (MTJs).
    • 磁性随机存取存储器(MRAM)包括具有配置在比特单元输出节点和比特单元的参考节点之间的均衡器装置的读取感测电路。 在读操作的初始部分期间,均衡器被导通以将输出节点耦合到参考节点,并且在均衡延迟周期之后将输出节点与参考节点去耦。 读出放大器能够仅在延迟周期之后从位单元提供数据输出,并且将输出节点与参考节点解耦,以提供由并行和反并联状态磁隧道结(MTJ)表示的数据的平衡感测速度。
    • 10. 发明申请
    • MAGNETIC RANDOM ACCESS MEMORY (MRAM) READ WITH REDUCED DISTURB FAILURE
    • 磁性随机存取存储器(MRAM)读取与减少的干扰故障
    • WO2012116375A1
    • 2012-08-30
    • PCT/US2012/026831
    • 2012-02-27
    • QUALCOMM INCORPORATEDKIM, Jung PillKIM, Tae HyunLEE, Kangho
    • KIM, Jung PillKIM, Tae HyunLEE, Kangho
    • G11C11/16
    • G11C11/1673G11C11/1693
    • Magnetic tunnel junctions (MTJs) in magnetic random access memory (MRAM) are subject to read disturb events when the current passing through the MTJ causes a spontaneous switching of the MTJ due to spin transfer torque (STT) from a parallel state to an anti-parallel state or from an anti-parallel state to a parallel state. Because the state of the MTJ corresponds to stored data, a read disturb event may cause data loss in MRAM devices. Read disturb events may be reduced by controlling the direction of current flow through the MTJ. For example, the current direction through a reference MTJ may be selected based on the state of the reference MTJ. In another example, the current direction through a data or reference MTJ may be alternated such that the MTJ is only subject to read disturb events during approximately half the read operations on the MTJ.
    • 磁流体随机存取存储器(MRAM)中的磁隧道结(MTJ)在经过MTJ的电流导致由于自旋转移转矩(STT)从平行状态到抗反射的MTJ自发切换时,受到读取干扰事件, 平行状态或从反平行状态到并行状态。 因为MTJ的状态对应于存储的数据,读取干扰事件可能导致MRAM设备中的数据丢失。 通过控制通过MTJ的电流的方向可以减少读取干扰事件。 例如,可以基于参考MTJ的状态来选择通过参考MTJ的当前方向。 在另一示例中,可以交替通过数据或参考MTJ的当前方向,使得MTJ仅在MTJ上的大约一半的读取操作期间经受读取干扰事件。