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    • 72. 发明公开
    • Reference generator circuit and method for nonvolatile memory devices
    • 参考报告错误报告错误
    • EP1282131A2
    • 2003-02-05
    • EP02255341.6
    • 2002-07-31
    • STMicroelectronics, Inc.
    • Michael, OronSever, Illan
    • G11C7/14G11C16/28
    • G11C16/28G11C5/147G11C7/14
    • Reference generator circuitry for providing a reference to sense amplifiers in a flash memory device. The circuitry includes a reference current generator for generating a reference current for use by the sense amplifier circuits. A current buffer circuit in the flash memory device mirrors the reference current and applies a plurality of mirrored reference currents to the reference inputs of the sense amplifiers. A startup circuit is utilized in order to provide a fast settling time of the reference node appearing at the input of the sense amplifiers. The startup circuit includes first and second discharge current stages, with the first discharge current stage discharging the charge appearing at the reference node input of the sense amplifiers based upon a bandgap reference current. The second discharge current stage discharging the charge appearing at the reference node input of the sense amplifiers based upon the reference current. Each discharge current stage utilizes feedback to gradually decrease the rate of discharge by the discharge current stage so that the discharge current stages are disabled by the time the voltage appearing at the reference node input of the sense amplifiers reaches the desired voltage level.
    • 参考发生器电路,用于提供闪速存储器件中的读出放大器的参考。 电路包括用于产生由读出放大器电路使用的参考电流的参考电流发生器。 闪速存储器件中的当前缓冲电路反映参考电流,并将多个镜像参考电流施加到读出放大器的基准输入。 利用启动电路来提供出现在读出放大器的输入端处的参考节点的快速建立时间。 启动电路包括第一和第二放电电流级,其中第一放电电流级基于带隙参考电流对出现在读出放大器的参考节点输入端的电荷进行放电。 基于参考电流,第二放电电流级对出现在读出放大器的参考节点输入端的电荷进行放电。 每个放电电流级利用反馈来逐渐降低放电电流级的放电速率,使得在感测放大器的参考节点输入处出现的电压达到期望电压电平的时候,放电电流级被禁止。
    • 74. 发明公开
    • Semiconductor memory device
    • 半导体存储器件
    • EP1152427A3
    • 2002-08-14
    • EP01303711.4
    • 2001-04-24
    • Sharp Kabushiki Kaisha
    • Takata, MasahiroTakata, Hidekazu
    • G11C7/14G11C16/28G11C7/12
    • G11C7/14G11C16/28
    • A semiconductor memory device includes a plurality of memory banks each including a plurality of memory cells, one of which is selectable in accordance with an address signal; a memory bit line for receiving a read voltage from the selected memory cell; a reference cell for outputting a reference voltage; a reference bit line for receiving the reference voltage; a comparison and amplification device for amplifying a difference between a voltage from the memory bit line and a voltage from the reference bit line; and a load capacitance adjusting device for providing a third load capacitance to the reference bit line so that a first load capacitance between the selected memory cell and the comparison and amplification device is substantially equal to a second load capacitance between the reference cell and the comparison and amplification device.
    • 半导体存储器件包括多个存储体,每个存储体包括多个存储单元,其中一个存储单元可以根据地址信号进行选择; 存储器位线,用于从所选择的存储器单元接收读取电压; 用于输出参考电压的参考单元; 用于接收参考电压的参考位线; 比较和放大装置,用于放大来自存储器位线的电压和来自参考位线的电压之间的差值; 以及负载电容调整装置,用于向所述参考位线提供第三负载电容,使得所选择的存储器单元与所述比较放大装置之间的第一负载电容基本上等于所述参考单元与所述比较之间的第二负载电容,以及 放大器。