Regulation method for the source voltage in a nonvolatile memory cell during programming and corresponding program circuit
    68.
    发明公开
    Regulation method for the source voltage in a nonvolatile memory cell during programming and corresponding program circuit 有权
    一种用于编程非易失性存储器单元期间调节的源极电压和相应的编程电路的方法

    公开(公告)号:EP1331644A2

    公开(公告)日:2003-07-30

    申请号:EP02019433.8

    申请日:2002-08-30

    CPC classification number: G11C16/30

    Abstract: The invention relates to a method and a circuit for regulating the source terminal (S) voltage to the of a non-volatile memory cell (3) during the cell programming and/or reading phases. The method comprises a phase of locally regulating said voltage value and consists of comparing the source current (Is) of the cell array (3) with a reference current (Iref). A fraction of the source current (Is) is converted to a voltage and compared with a voltage generated from a memory cell acting as a reference and being programmed to the distribution with the highest current levels; the comparison result being used for controlling a current generator (25) to inject, into the source terminal (S), the current necessary to keep the predetermined voltage thereof at a constant value.

    Abstract translation: 本发明涉及一种方法和用于该单元编程期间调节所述源终端(S)到一个非易失性存储单元(3)的电压和/或读取阶段的电路。 该方法包括在本地调节所述电压值和所述单元阵列(3)的源极电流(IS)与基准电流(IREF)比较的besteht的相位。 源电流(IS)的一小部分被转换为一个电压,并与从作为参考,被编程为具有最高电流电平的分布的存储单元中产生的电压进行比较; 被用于控制的电流发生器(25)注入,到源终端(S)的比较结果,所需的电流为恒定值保持其预定的电压。

    A/D conversion method in high density multilevel non-volatile memory devices and corresponding converter device
    70.
    发明公开
    A/D conversion method in high density multilevel non-volatile memory devices and corresponding converter device 有权
    在非易失性更通常高密度存储器和相关联的换能器为模拟/数字转换的方法

    公开(公告)号:EP1211812A3

    公开(公告)日:2003-02-12

    申请号:EP00127649.2

    申请日:2000-11-23

    CPC classification number: G11C11/56 G11C27/005 H03M1/146 H03M1/361

    Abstract: The invention relates to an analog-to-digital conversion method and relevant device, in high-density multilevel non-volatile memory devices. The method applies to multilevel memory cells comprising a floating gate transistor with drain and source terminals; the cell to be read is subjected to a reading operation by applying predetermined bias voltage values to its drain and source terminals, while to its drain terminal is applied a predetermined current value (Iref), and by measuring the value of its gate voltage (Vg). The method of the invention comprises a first conversion phase the most significant bits (MSB) contained in the memory cell, followed by a second conversion phase of the least significant bits (LSB). The first step is completed within a time gap (T1-T0) which corresponds to the rise transient of the gate voltage signal (Vg), while the second step is started at the end of the transient.

Patent Agency Ranking