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    • 6. 发明授权
    • NVM PMOS-cell with one erased and two programmed states
    • NVM PMOS单元具有一个擦除和两个编程状态
    • US07113427B1
    • 2006-09-26
    • US11076711
    • 2005-03-09
    • Yuri MirgorodskiPeter J. HopperVladislav VashchenkoPhilipp Lindorfer
    • Yuri MirgorodskiPeter J. HopperVladislav VashchenkoPhilipp Lindorfer
    • G11C16/04
    • G11C11/5628G11C16/12G11C16/3459H01L27/115H01L29/7881
    • NVM cell for storing three levels of charge: one erased and two programmed states. The cell comprises a transistor structure providing a gate current versus gate voltage curve having a shape with a flat region or a second peak. To provide such a structure, one embodiment combines two parallel transistors having different threshold voltages, and another embodiment uses one transistor with variable doping. The gate current curve provides two programming zones. Programming the first state includes applying a voltage across a channel, ramping up a gate voltage in the first programming zone, followed by ramping it back down. Programming the second state comprises applying a voltage across a channel, ramping up a gate voltage past the first programming zone and into the second programming zone, followed by ramping it back down. Ramping the voltage back down may optionally be preceded by turning off the voltage across the channel.
    • 用于存储三个电荷电平的NVM单元:一个擦除和两个编程状态。 该单元包括提供具有平坦区域或第二峰值的形状的栅极电流对栅极电压曲线的晶体管结构。 为了提供这样的结构,一个实施例组合了具有不同阈值电压的两个并联晶体管,另一实施例使用一个具有可变掺杂的晶体管 栅极电流曲线提供两个编程区域。 对第一状态进行编程包括在一个通道上施加电压,使第一个编程区中的栅极电压升高,然后将其向下斜坡。 对第二状态进行编程包括在通道上施加电压,将栅极电压升高到第一编程区并进入第二编程区,然后将其向下斜坡。 可以选择先将电压降低,然后关闭通道上的电压。