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61. 发明授权

US5909396A High voltage NMOS pass gate having supply range, area, and speed advantages 有权
标题翻译：具有供电范围，面积和速度优势的高压NMOS通道门
公开(公告)号：US5909396A
公开(公告)日：1999-06-01
申请号：US127991
申请日：1998-08-03
申请人： Binh Quang Le , Pau-Ling Chen , Shane Charles Hollmer , Chung-You Hu , Narbeh Derhacobian
发明人： Binh Quang Le , Pau-Ling Chen , Shane Charles Hollmer , Chung-You Hu , Narbeh Derhacobian
IPC分类号： G11C8/08 , G11C16/06
CPC分类号： G11C8/08
摘要： According to an aspect of the embodiments, the block decoder control circuits which drive the pass transistors for the word lines for a flash memory array are driven with a control voltage that is regulated to be one enhancement transistor's threshold voltage higher than the highest voltage that is actually driven onto the word lines. According to another aspect of some of the embodiments, the block decoder control circuits are implemented with transistors having a very low threshold voltage. According to yet another aspect of some of the embodiments, a special series connection is used to prevent any leakage current through the block decoder control circuit from the high voltage generating charge pumps which might otherwise result from the use of low threshold voltage transistors. In the special series connection, any leakage current occurs from the supply voltage source rather than from the high voltage generating charge pumps. According to still another aspect of some of the embodiments, a special gate connection applies an intermediate bias voltage higher than a positive supply voltage onto the gates of the unselected block decoder transistors that are connected to a high-voltage. Several embodiments are presented which combine the regulated control voltage aspect and various combinations of the other aspects.
摘要翻译：根据实施例的一个方面，驱动用于闪存阵列的字线的传输晶体管的块解码器控制电路被控制电压驱动，该控制电压被调节为高于最高电压的一个增强晶体管的阈值电压实际上驱动到字线上。根据一些实施例的另一方面，块解码器控制电路用具有非常低的阈值电压的晶体管来实现。根据一些实施例的另一方面，使用特殊的串联连接来防止任何来自块解码器控制电路的泄漏电流与由高阈值电压晶体管使用而产生的高电压产生电荷泵。在特殊的串联连接中，从电源电压源而不是高压发生电荷泵发生泄漏电流。根据一些实施例的另一方面，特殊栅极连接将高于正电源电压的中间偏置电压施加到连接到高电压的未选择的块解码器晶体管的栅极上。提出了组合调节的控制电压方面和其他方面的各种组合的几个实施例。

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