利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

4 条记录 (耗时 0.018 秒)

    SPREAD SPECTRUM CLOCK GENERATOR CAPABLE OF FREQUENCY MODULATION WITH HIGH ACCURACY
    2.
    发明申请
    SPREAD SPECTRUM CLOCK GENERATOR CAPABLE OF FREQUENCY MODULATION WITH HIGH ACCURACY 审中-公开
    具有高精度频率调制功能的发射频谱发生器

    公开(公告)号：US20090141774A1

    公开(公告)日：2009-06-04

    申请号：US12365321

    申请日：2009-02-04

    申请人： Masahiro ARAKI ,  Chieko Hayashi

    发明人： Masahiro ARAKI ,  Chieko Hayashi

    IPC分类号： H04B1/69

    CPC分类号： H03L7/0812 ,  H03L7/081 ,  H03L7/0996 ,  H03L7/23 ,  H03L7/235

    摘要： In a spread spectrum clock generator, a DLL circuit delays an oscillation clock signal from a VCO and outputs ten delay clock signals having different phases respectively. A selector selects any one of the ten delay clock signals, and outputs a selected clock signal. A control circuit controls a signal selection operation of the selector. A feedback frequency divider divides a frequency of the selected clock signal by a frequency division ratio N, and generates a comparison clock signal. In this manner, a phase of the comparison clock signal can be fine-tuned. Therefore, a spread spectrum clock generator capable of frequency modulation with high accuracy can be obtained.

    摘要翻译： 在扩频时钟发生器中，DLL电路延迟来自VCO的振荡时钟信号，并分别输出具有不同相位的十个延迟时钟信号。 选择器选择十个延迟时钟信号中的任何一个，并输出所选择的时钟信号。 控制电路控制选择器的信号选择操作。 反馈分频器将所选择的时钟信号的频率除以分频比N，并产生比较时钟信号。 以这种方式，可以微调比较时钟信号的相位。 因此，可以获得能够高精度进行频率调制的扩频时钟发生器。

    SEMICONDUCTOR DEVICE
    3.
    发明申请
    SEMICONDUCTOR DEVICE 有权
    半导体器件

    公开(公告)号：US20120229197A1

    公开(公告)日：2012-09-13

    申请号：US13369063

    申请日：2012-02-08

    申请人： Masahiro ARAKI ,  Atsuhiko Ishibashi

    发明人： Masahiro ARAKI ,  Atsuhiko Ishibashi

    IPC分类号： G11C5/14

    CPC分类号： G11C7/1057 ,  G11C13/0002

    摘要： The present invention provides a semiconductor device in which an adjustable range of a resistance value of a variable resistance circuit is large. The semiconductor device has an output buffer including a plurality of sets of resistance elements and a plurality of sets of transistors, a plurality of replica circuits, and a plurality of sets of operational amplifiers, and drain currents of the plurality of sets of transistors are adjusted so that output impedances of the output buffer become predetermined values. Therefore, even in the case where the resistance values of the resistance elements largely fluctuate due to fluctuations in manufacture process and the like, the output impedances can be set to predetermined values.

    摘要翻译： 本发明提供一种半导体器件，其中可变电阻电路的电阻值的可调范围大。 半导体器件具有包括多组电阻元件和多组晶体管，多个复制电路和多组运算放大器的输出缓冲器，并且调节多组晶体管的漏极电流 使得输出缓冲器的输出阻抗变为预定值。 因此，即使在电阻元件的电阻值由于制造工艺等的波动而大幅波动的情况下，也可以将输出阻抗设定为规定值。