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    • 3. 发明授权
    • Semiconductor memory read and write access
    • 半导体存储器读写访问
    • US09224487B2
    • 2015-12-29
    • US13749246
    • 2013-01-24
    • Spansion LLC
    • Kaoru MoriToshiya Uchida
    • G11C11/06G11C16/26G11C7/18G11C7/22G11C16/24G11C16/32
    • G11C16/26G11C7/18G11C7/227G11C16/24G11C16/32
    • A semiconductor memory includes a sense amplifier which operates in response to activation of a sense amplifier enable signal and determines logic held in a nonvolatile memory cell according to a voltage of a bit line, the voltage varying with a cell current flowing through a real cell transistor, a replica cell transistor coupled in series between a first node and a ground line, and a timing generation unit. The timing generation unit activates the sense amplifier enable signal when the first node coupled to the ground line via the replica cell transistor changes from a high level to a low level. The replica cell transistor includes a control gate receiving a constant voltage and a floating gate coupled to the control gate. Thus, the activation timing of the sense amplifier can be optimally set in accordance with the electric characteristic of the memory cell.
    • 半导体存储器包括读出放大器,其响应于读出放大器使能信号的激活而操作,并且根据位线的电压确定保持在非易失性存储器单元中的逻辑,该电压随着流过真实单元晶体管的单元电流而变化 耦合在第一节点和地线之间的复制单元晶体管,以及定时产生单元。 当通过复制单元晶体管耦合到接地线的第一节点从高电平变为低电平时,定时生成单元激活读出放大器使能信号。 复制单元晶体管包括接收恒定电压的控制栅极和耦合到控制栅极的浮置栅极。 因此,可以根据存储单元的电特性来最佳地设置读出放大器的激活定时。