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    • 1. 发明授权
    • Flash memory erase with controlled band-to-band tunneling current
    • 具有受控的带对隧道电流的闪存擦除
    • US5699298A
    • 1997-12-16
    • US718525
    • 1996-10-07
    • Tzeng-Huei ShiauRay-Lin WanYuan-Chang LiuChun-Hsiung HungWeitong ChuangHan Sung ChenFuchia Shone
    • Tzeng-Huei ShiauRay-Lin WanYuan-Chang LiuChun-Hsiung HungWeitong ChuangHan Sung ChenFuchia Shone
    • G11C16/16G11C16/30G11C16/00
    • G11C16/3445G11C16/16G11C16/30
    • Substantial reduction in peak current encountered during an erase process for a flash memory device is achieved by selection of source voltage potential during the erase according to the expected band-to-band tunneling current encountered during the process. During the beginning of the process, a lower source voltage potential is selected, which is high enough to cause significant erasing while suppressing band-to-band tunneling current in a portion of the array, and during a second part of the erasing process, a higher source potential is utilized, which ensures successful erasing of the array, without exceeding the peak current requirements of the power supply used with the device. The first and second parts of the erase sequence will induce band-to-band tunneling current in addition to Fowler-Nordheim tunneling current. The band-to-band tunneling current is characterized by a turn on threshold source potential which is inversely related to the threshold of the cell receiving the voltage sequence. The source voltage used in the first part of the erase sequence is set at level that is near or above the turn on threshold source potential for higher threshold cells that are in the high threshold state, but less than the turn on threshold source potential for lower threshold cells in the high threshold state. The source potential in the second part is set at level which is near or above the turn on threshold source potential for lower threshold cells in the high threshold state.
    • PCT No.PCT / US96 / 07490 Sec。 371日期1996年10月7日第 102(e)1996年10月7日PCT 1996年5月22日提交闪速存储器件的擦除过程中遇到的峰值电流的实质性降低是通过根据预期的带 - 带来在擦除期间选择源极电压电位来实现的 过程中遇到的隧道电流。 在该过程开始时,选择较低的源极电压电位,其足够高以引起显着擦除,同时抑制阵列的一部分中的带间隧穿电流,并且在擦除处理的第二部分期间, 利用更高的源极电位,确保阵列的成功擦除,而不超过与器件一起使用的电源的峰值电流要求。 擦除序列的第一部分和第二部分除了Fowler-Nordheim隧道电流之外还将引起带间隧穿电流。 带 - 带隧穿电流的特征在于开启阈值源极电位,其与接收电压序列的电池的阈值成反比。 在擦除序列的第一部分中使用的源电压被设置为接近或高于处于高阈值状态的较高阈值电池的阈值源极电位的接通或高于电平,但小于阈值源电位的导通电平较低 阈值细胞处于高阈值状态。 第二部分中的源极电位被设置在接近或高于阈值电位的阈值源电位的接通或高于在高阈值状态下的较低阈值电池的电位。