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    • 8. 发明授权
    • Semiconductor memory and test method for the semiconductor memory
    • 半导体存储器的半导体存储器和测试方法
    • US08248835B2
    • 2012-08-21
    • US12718800
    • 2010-03-05
    • Tadashi MiyakawaDaisaburo Takashima
    • Tadashi MiyakawaDaisaburo Takashima
    • G11C11/12
    • G11C29/50G11C11/22G11C29/12005G11C29/1201G11C2029/1204
    • Semiconductor memory contains memory cells having ferroelectric capacitors and cell transistors, bit lines connected to memory cells, word lines connected to gate electrodes of cell transistors, plate lines connected to one of two electrodes of ferroelectric capacitors, sense amplifiers connected between each pair of bit lines. Further, a test pad is provided in order to apply an external voltage to each of bit lines, test transistors are provided corresponding to bit lines respectively, each of test transistors is connected between the test pad and each of bit lines, a fatigue test bias circuit is connected to a first node located between the test pad and test transistors. Test transistors are shared in a first test to apply a first voltage to ferroelectric capacitors from an outside via the test pad and a second test to apply a second voltage to ferroelectric capacitors from the fatigue test bias circuit.
    • 半导体存储器包括具有铁电电容器和单元晶体管的存储单元,连接到存储单元的位线,连接到单元晶体管的栅电极的字线,连接到铁电电容器的两个电极之一的板线,连接在每对位线之间的读出放大器 。 此外,为了对每个位线施加外部电压,提供了测试焊盘,分别对应于位线提供了测试晶体管,每个测试晶体管连接在测试焊盘和每个位线之间,疲劳测试偏置 电路连接到位于测试焊盘和测试晶体管之间的第一节点。 测试晶体管在第一测试中被共享,以通过测试焊盘从外部施加第一电压到铁电电容器,以及从疲劳测试偏置电​​路向铁电电容器施加第二电压的第二测试。