摘要:
Each memory cell of an EPROM contains two MOSFETs and a data of each memory cell is read out by detecting a current difference between the two MOSFETs by using a differential amplifier. In such constitution as described above, even when the data is erased by irradiating an ultraviolet ray, a stable output of the differential amplifier can be obtained and, therefore, confirmation of an initialized state can be facilitated. Specifically, a channel width WA of one of the two MOSFETs constituting the memory cell is formed narrower than a channel width WB of the other. By such arrangement as described above, in an initialized state in which the ultraviolet ray is irradiated, a data signal current value IHA of the MOSFET having the channel width WA becomes smaller than a data signal current value IHB flowing in the MOSFET having the channel width WB. Accordingly, the output of the differential amplifier is fixed in accordance with a current magnitude relation of IHA
摘要翻译:EPROM的每个存储单元包含两个MOSFET,并且通过使用差分放大器检测两个MOSFET之间的电流差来读出每个存储单元的数据。 在这样构成的情况下,即使通过照射紫外线来擦除数据,也能够获得稳定的差分放大器的输出,因此能够促进初始化状态的确认。 具体地,构成存储单元的两个MOSFET之一的沟道宽度W A A A形成得窄于另一个的沟道宽度W B B。 通过如上所述的布置,在照射紫外线的初始化状态下,具有沟道宽度W A A的MOSFET的数据信号电流值I H HA < 小于在具有沟道宽度W B的MOSFET中流动的数据信号电流值I HB。 因此,差分放大器的输出根据I H B H I H B B的电流大小关系固定,从而定义数据“0”。 另一方面,在写入数据“1”时,将电荷注入具有沟道宽度W B B的MOSFET的浮置栅电极以提高阈值电压Vt,然后,MOSFET为 设置为“关闭”状态。
摘要:
Each memory cell of an EPROM contains two MOSFETs and a data of each memory cell is read out by detecting a current difference between the two MOSFETs by using a differential amplifier. In such constitution as described above, even when the data is erased by irradiating an ultraviolet ray, a stable output of the differential amplifier can be obtained and, therefore, confirmation of an initialized state can be facilitated. Specifically, a channel width WA of one of the two MOSFETs constituting the memory cell is formed narrower than a channel width WB of the other. By such arrangement as described above, in an initialized state in which the ultraviolet ray is irradiated, a data signal current value IHA of the MOSFET having the channel width WA becomes smaller than a data signal current value IHB flowing in the MOSFET having the channel width WB. Accordingly, the output of the differential amplifier is fixed in accordance with a current magnitude relation of IHA
摘要翻译:EPROM的每个存储单元包含两个MOSFET,并且通过使用差分放大器检测两个MOSFET之间的电流差来读出每个存储单元的数据。 在这样构成的情况下,即使通过照射紫外线来擦除数据,也能够获得稳定的差分放大器的输出,因此能够促进初始化状态的确认。 具体地,构成存储单元的两个MOSFET之一的沟道宽度W A A A形成得窄于另一个的沟道宽度W B B。 通过如上所述的布置,在照射紫外线的初始化状态下,具有沟道宽度W A A的MOSFET的数据信号电流值I H HA < 小于在具有沟道宽度W B的MOSFET中流动的数据信号电流值I HB。 因此,差分放大器的输出根据I H B H I H B B的电流大小关系固定,从而定义数据“0”。 另一方面,在写入数据“1”时,将电荷注入具有沟道宽度W B B的MOSFET的浮置栅电极以提高阈值电压Vt,然后,MOSFET为 设置为“关闭”状态。
摘要:
In a method of injection-molding a thermoplastic resin wherein a weld is formed in the mold cavity by the fusion of separate resin streams, use is made of a mold provided with a resin well protruding from the molded cavity or a runner on at least one of the separate resin streams at a point between where the injected molten resin is separated into streams and the weld. The resin is poured into the resin well after the formation of the weld from the feed of the molten resin into the mold cavity to cause migration of the resin at the weld, thus forcing the resin on one side of the weld into the resin of the other side of the weld to thereby strengthen the weld.
摘要:
In a method of injection-molding a thermoplastic resin wherein a weld is formed in the mold cavity by the fusion of separate resin streams, use is made of a mold provided with a resin well protruding from the molded cavity or a runner on at least one of the separate resin streams at a point between where the injected molten resin is separated into streams and the weld. The resin is poured into the resin well after the formation of the weld from the feed of the molten resin into the mold cavity to cause migration of the resin at the weld, thus forcing the resin on one side of the weld into the resin of the other side of the weld to thereby strengthen the weld.