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    • 41. 发明申请
    • Semiconductor integrated circuit and signal sending/receiving system
    • 半导体集成电路和信号发送/接收系统
    • US20050024084A1
    • 2005-02-03
    • US10855351
    • 2004-05-28
    • Takashi HirataToru Iwata
    • Takashi HirataToru Iwata
    • G05F1/56H04L25/02H03K19/003
    • H04L25/0278G05F1/56H04L25/028H04L25/0292
    • A terminal resistor built in a signal-sending or signal-receiving semiconductor integrated circuit is composed of a parallel circuit of a polysilicon resistor element having excellent frequency characteristic and a P-type MOS transistor. The resistance value of the polysilicon resistor element is set so as to be an approximate value of the characteristic impedance of a transmission line to be connected. The gate voltage of the P-type MOS transistor is controlled by a gate bias voltage adjustment circuit. The resistance value of the P-type MOS transistor is variably adjusted. Variation in the resistance value of the polysilicon resistor element due to dispersion in its manufacturing process is absorbed by variably adjusting the resistance value of the P-type MOS transistor. The combined resistance value of the polysilicon resistor element and the P-type MOS transistor is adjusted with high precision just to the characteristic impedance of the transmission line. Thus, a signal-sending or signal-receiving semiconductor integrated circuit in which the terminal resistor having excellent frequency and DC characteristics is built can be obtained.
    • 内置在信号发送或信号接收半导体集成电路中的端子电阻由具有优异频率特性的多晶硅电阻元件和P型MOS晶体管的并联电路组成。 将多晶硅电阻元件的电阻值设定为要连接的传输线的特性阻抗的近似值。 P型MOS晶体管的栅极电压由栅极偏置电压调节电路控制。 可变地调节P型MOS晶体管的电阻值。 通过可变地调节P型MOS晶体管的电阻值来吸收由于其制造过程中的分散而导致的多晶硅电阻元件的电阻值的变化。 与传输线的特性阻抗相比,多晶硅电阻元件和P型MOS晶体管的组合电阻值被高精度地调整。 因此,可以获得其中构建具有优异的频率和DC特性的端子电阻器的信号发送或信号接收半导体集成电路。
    • 42. 发明授权
    • Multi-phase clock transmission circuit and method
    • 多相时钟传输电路及方法
    • US06794912B2
    • 2004-09-21
    • US10361610
    • 2003-02-11
    • Takashi HirataToru Iwata
    • Takashi HirataToru Iwata
    • H03D324
    • H03L7/0805H03K5/133H03K5/1504H03L7/07H03L7/08H03L7/0812H03L7/0814
    • A multi-phase clock transmission circuit includes: a clock generator for generating a clock synchronizing with a reference clock and a control signal responsive to the phase difference between the reference clock and the generated clock; and a delay circuit for generating a multi-phase clock based on the clock and the control signal. The clock generator generates a signal having a frequency equal to an integral multiple of the frequency of the reference clock and outputs the signal as the clock. The delay circuit has a circuit receiving the clock and including a plurality of delay elements in cascade connection each giving a delay according to the control signal to an input signal. Signals output from the plurality of delay elements are used as signals constituting the multi-phase clock.
    • 多相时钟传输电路包括:时钟发生器,用于响应于参考时钟和所产生的时钟之间的相位差,产生与参考时钟同步的时钟和控制信号; 以及用于基于时钟和控制信号产生多相时钟的延迟电路。 时钟发生器产生具有等于参考时钟的频率的整数倍的频率的信号,并将该信号作为时钟输出。 延迟电路具有接收时钟并且包括多个级联连接的延迟元件的电路,每个延迟元件根据与输入信号的控制信号给出延迟。 将从多个延迟元件输出的信号用作构成多相时钟的信号。
    • 43. 发明授权
    • Semiconductor integrated circuit and semiconductor integrated circuit system having serially interconnectable data buses
    • 具有串行可互连数据总线的半导体集成电路和半导体集成电路系统
    • US06297675B1
    • 2001-10-02
    • US09478530
    • 2000-01-06
    • Hironori AkamatsuYutaka TeradaTakashi HirataYukio ArimaSatoshi TakahashiTadahiro YoshidaYoshihide KomatsuHiroyuki Yamauchi
    • Hironori AkamatsuYutaka TeradaTakashi HirataYukio ArimaSatoshi TakahashiTadahiro YoshidaYoshihide KomatsuHiroyuki Yamauchi
    • H03B100
    • H03K19/018514Y10T307/549
    • A data line pair and a strobe line pair are provided between first and second chips to exchange data therebetween. The first chip includes an output circuit and a controller for controlling the output circuit. The second chip includes an input circuit. For example, the output circuit supplies a direct current from a power supply to one of the data lines. Then, the input circuit feeds back the received current to the output circuit through a pair of terminal resistors and the other data line. Subsequently, the output circuit supplies the fed back direct current to one of the strobe lines. In response, the input circuit feeds back the received current again to the output circuit through another pair of terminal resistors and the other strobe line. And then the fed back current is drained to the ground. Thus, compared to driving the data and strobe line pairs separately with the same amount of current supplied, the current dissipation can be halved. In this manner, the present invention is applicable to reduction of current dissipation when data should be transmitted at high speeds through multiple data bus pairs that are driven with a current supplied.
    • 在第一和第二芯片之间提供数据线对和选通线对,以在它们之间交换数据。 第一芯片包括输出电路和用于控制输出电路的控制器。 第二芯片包括输入电路。 例如,输出电路将电流从电源提供给数据线之一。 然后,输入电路通过一对端子电阻和另一条数据线将接收的电流反馈到输出电路。 随后,输出电路将反馈的直流电流提供给选通线之一。 作为响应,输入电路通过另一对端子电阻器和另一个选通线路将接收到的电流再次反馈到输出电路。 然后将反馈电流排到地面。 因此,与以相同的电流量驱动数据和选通线对相比,电流消耗可以减半。 以这种方式,本发明可应用于当通过以所提供的电流驱动的多个数据总线对以高速传输数据时,减少电流消耗。
    • 46. 发明授权
    • Skewing-suppressive output buffer circuit
    • 偏移抑制输出缓冲电路
    • US6073245A
    • 2000-06-06
    • US234708
    • 1999-01-21
    • Takashi HirataToru Iwata
    • Takashi HirataToru Iwata
    • G06F5/06G06F1/12
    • G06F5/06
    • In an output buffer circuit, an input signal is transmitted through a bus by way of a latch circuit and a driver. A stable-state interval detector detects an interval during which the input signal remains in the same logical state. If the stable-state interval detected is relatively short, a drivability controller controls the drivability of the driver at a normal value. To the contrary, if the interval detected is relatively long, the controller increases the drivability of the driver. In general, if the stable-state interval of an input signal is relatively long, then the time taken for the subsequent logical state transition of the signal tends to be longer as compared with a signal having a shorter stable-state interval. However, if the drivability of the driver is increased, then the state transition time is shortened, and substantially equalized with that of a signal having a relatively short stable-state interval. As a result, signal skewing can be minimized.
    • 在输出缓冲电路中,输入信号通过一个总线通过一个锁存电路和一个驱动器传输。 稳态区间检测器检测输入信号保持在相同逻辑状态的间隔。 如果检测到的稳态间隔相对较短,则驾驶员控制器将驾驶员的驾驶性能控制在正常值。 相反,如果检测到的间隔相对较长,则控制器增加驾驶员的驾驶性能。 一般来说,如果输入信号的稳态间隔相对较长,则与具有较短稳态间隔的信号相比,信号的后续逻辑状态转换所花费的时间趋于变长。 然而,如果驾驶员的驾驶性能增加,则状态转移时间缩短,并且与具有相对较短的稳态间隔的信号基本相等。 结果,信号偏移可以最小化。