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    • 1. 发明授权
    • Test circuit for differential cascode voltage switch
    • 差分共源共栅电压开关测试电路
    • US4656417A
    • 1987-04-07
    • US759804
    • 1985-07-29
    • Edward S. KirkpatrickEric P. KronstadtRobert K. MontoyeWinfried W. Wilcke
    • Edward S. KirkpatrickEric P. KronstadtRobert K. MontoyeWinfried W. Wilcke
    • H03K17/00G01R31/28G01R31/3185G06F11/00G06F11/267
    • G06F11/2215G01R31/318541G01R31/318572G01R31/31858G06F11/0751
    • An improved testing and checking circuit for a Differential Cascode Voltage Switch which uses N-devices for both the invalid (0,0) and (1,1) state detection of Q and Q switch signals, and uses decoupling pass devices for sampling the data at the fall of the system C-clock, additionally allowing simultaneous pre-charging and error detection. The testing and checking circuit is incorporated in a hierarchical scheme, which uses the system C-clock for input to the latches, decoupling of the buffers, and pulling up and down the error lines. The error fault is held in a system latch. Also described is a circuit scheme which self tests a large macro using only the C-clock and latches the result in a single latch. More particularly, the described circuit employs the Q and Q signals in a NOR configuration, thus detecting if neither signal has sufficient voltage to pull down the load device which consists of a P-device whose gate is attached to the C-clock. The resulting signal is run to a gate in parallel with the two N-devices. Thus, the two low signals allow this NOR gate to rise and produce a pulldown leg to an error line. An invalid signal condition is detected if either both signals are sufficiently high to turn on an N-device or neither signal is high enough to turn on an N-device. Therefore, the described circuit registers a failure if and only if there is the potential for a tree with the same inputs to enter an invalid state.
    • 用于差分串联电压开关的改进的测试和检查电路,其使用N个器件用于Q和& upbar&Q开关信号的无效(0,0)和(1,1)状态检测,并使用去耦通设备进行采样 数据在系统C-clock掉落时,另外允许同时进行预充电和错误检测。 测试和检查电路并入分层方案,其使用系统C时钟输入到锁存器,解耦缓冲器以及上下错误线。 错误故障保存在系统锁存器中。 还描述了一种电路方案,其仅使用C时钟自检测大宏,并将结果锁存在单个锁存器中。 更具体地,所描述的电路采用NOR配置中的Q和& Upbar&Q信号,从而检测两个信号是否没有足够的电压来下拉由栅极连接到C时钟的P装置构成的负载装置。 结果信号与两个N器件并行运行到门。 因此,两个低信号允许该或非门上升并产生到故障线的下拉腿。 如果两个信号都足够高以接通N装置,或者两个信号都不足够高以打开N装置,则检测到无效信号条件。 因此,当且仅当存在具有相同输入的树进入无效状态的可能性时,所描述的电路注册失败。