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    • 6. 发明授权
    • Self refresh circuit of PSRAM for real access time measurement and operating method for the same
    • PSRAM的自刷新电路用于实时访问时间测量和操作方法相同
    • US07187609B2
    • 2007-03-06
    • US11261152
    • 2005-10-28
    • Soo-Young KimHyun Seok Lee
    • Soo-Young KimHyun Seok Lee
    • G11C7/00
    • G11C11/406G11C7/1045G11C11/40611G11C11/40615G11C2211/4061
    • A self refresh circuit includes a refresh control unit and an internal refresh circuit. The refresh control unit generates a refresh control signal based on a refresh period pulse when a MRS (Mode Set Register) command is deactivated, interrupts an output of the refresh control signal based on a self-refresh-entrance inhibiting signal when the MRS command is deactivated, and generates a refresh command regardless of the refresh period pulse when the MRS command is activated. The MRS command is generated by a combination of at least one address signal and at least one control signal. The internal refresh circuit performs a refresh operation based on the refresh command. Accordingly, access time may be measured correctly and test time may be reduced.
    • 自刷新电路包括刷新控制单元和内部刷新电路。 当MRS(模式设置寄存器)命令被停用时,刷新控制单元基于刷新周期脉冲产生刷新控制信号,当MRS命令为“是”时,基于自刷新进入禁止信号中断刷新控制信号的输出 并且当MRS命令被激活时,不管刷新周期脉冲如何,都产生刷新命令。 MRS命令由至少一个地址信号和至少一个控制信号的组合产生。 内部刷新电路基于刷新命令执行刷新操作。 因此,可以正确地测量访问时间,并且可以减少测试时间。
    • 10. 发明申请
    • Apparatus for inspecting inkjet head
    • 喷墨头检查装置
    • US20120007910A1
    • 2012-01-12
    • US12926319
    • 2010-11-09
    • Hyun Seok Lee
    • Hyun Seok Lee
    • B41J29/393
    • B41J2/125B41J2/0451B41J2/04541B41J2/04581
    • Disclosed herein is an apparatus for inspecting an inkjet head. The apparatus for inspecting an inkjet head includes a scan unit that is connected to the piezoelectric actuator of an inkjet head to measure whether the capacitance of the piezoelectric actuator is changed; a pulse input unit that applies high voltage pulses to the scan unit; a switching unit that connects or disconnects the scan unit to or from the piezoelectric actuator and the pulse input unit; and a controller that controls the switching unit to connect the scan unit to the piezoelectric actuator and the pulse input unit and receives the information on whether the capacitance of the piezoelectric actuator is changed according to the applied high voltage pulse from the scan unit to determine whether the piezoelectric actuator is abnormal.
    • 本文公开了一种用于检查喷墨头的装置。 用于检查喷墨头的装置包括扫描单元,其连接到喷墨头的压电致动器,以测量压电致动器的电容是否改变; 脉冲输入单元,向扫描单元施加高电压脉冲; 切换单元,其将扫描单元连接到压电致动器或脉冲输入单元; 以及控制器,其控制切换单元将扫描单元连接到压电致动器和脉冲输入单元,并且接收关于压电致动器的电容是否根据来自扫描单元的施加的高电压脉冲而改变的信息,以确定是否 压电执行器异常。