利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

8 条记录 (耗时 0.03 秒)

    Filter circuit permitting adjustment of cutoff frequency
    3.
    发明授权
    Filter circuit permitting adjustment of cutoff frequency 有权
    滤波电路允许调节截止频率

    公开(公告)号：US07310507B2

    公开(公告)日：2007-12-18

    申请号：US11043985

    申请日：2005-01-28

    申请人： Tatsuhiro Mizumasa ,  Koji Nozoe

    发明人： Tatsuhiro Mizumasa ,  Koji Nozoe

    IPC分类号： H04B1/06

    CPC分类号： H03H7/0153

    摘要： A filter circuit, having a plurality of selectable impedance elements, that has a cutoff frequency dependent on a selected impedance element, comprises a pulse generation circuit that supplies a variable frequency pulse with a successively increasing or decreasing frequency to an input of the filter circuit; and an impedance element selection unit that checks the attenuation of the output pulse of the filter circuit corresponding with the input of the variable frequency pulse and selects the plurality of impedance elements on the basis of the position of a pulse that is attenuated to or below a reference value.

    摘要翻译： 具有多个可选阻抗元件的滤波器电路具有取决于所选择的阻抗元件的截止频率，包括脉冲发生电路，其将连续递增或递减频率的可变频率脉冲提供给滤波器电路的输入端; 以及阻抗元件选择单元，其对与所述可变频率脉冲的输入相对应的所述滤波器电路的输出脉冲的衰减进行检查，并基于被衰减到或低于所述可变频率脉冲的脉冲的位置来选择所述多个阻抗元件 参考值。

    Semiconductor integrated circuit
    4.
    发明授权
    Semiconductor integrated circuit 有权
    半导体集成电路

    公开(公告)号：US06999020B2

    公开(公告)日：2006-02-14

    申请号：US10855738

    申请日：2004-05-28

    申请人： Tatsuhiro Mizumasa ,  Atsushi Hitaka

    发明人： Tatsuhiro Mizumasa ,  Atsushi Hitaka

    IPC分类号： H03M1/34

    CPC分类号： H03M1/002 ,  H03M1/168 ,  H03M1/44 ,  H03M1/66

    摘要： A frequency detecting circuit 10 detects frequency of a sampling pulse SP, and outputs the detected frequency as a detection value VOUT. A current adjusting circuit 20 adjusts a power supply current Ivd to be supplied to an AD converter 30 in accordance with the detection value VOUT. The power supply current Ivd varies continuously so as to follow the sampling frequency. As a result, an optimum power supply current Ivd can always be supplied in accordance with the operating frequency of the AD converter 30. That is, power consumption of the AD converter 30 can be reduced. Since the power supply current Ivd can be adjusted in accordance with the sampling frequency, it is possible to form the AD converter 30 that has a wide frequency band and allows great versatility.

    摘要翻译： 频率检测电路10检测采样脉冲SP的频率，并将检测到的频率作为检测值VOUT输出。 电流调节电路20根据检测值VOUT来调整供给到AD转换器30的电源电流Ivd。 电源电流Ivd连续变化，以便遵循采样频率。 结果，可以总是根据AD转换器30的工作频率提供最佳的电源电流Ivd。 也就是说，可以减少AD转换器30的功耗。 由于可以根据采样频率来调整电源电流Ivd，所以可以形成具有宽频带的AD转换器30并且允许很大的通用性。

    Cutoff frequency adjusting method, GmC filter circuit and semiconductor device
    5.
    发明授权
    Cutoff frequency adjusting method, GmC filter circuit and semiconductor device 有权
    截止频率调节方法，GmC滤波电路及半导体器件

    公开(公告)号：US07764116B2

    公开(公告)日：2010-07-27

    申请号：US12111556

    申请日：2008-04-29

    申请人： Tatsuhiro Mizumasa

    发明人： Tatsuhiro Mizumasa

    IPC分类号： H03K5/00

    CPC分类号： H03H11/0422 ,  H03H11/1291

    摘要： A cutoff frequency adjusting method adjusts a cutoff frequency of a GmC filter circuit which has a capacitor and an Operational Transconductance Amplifier (OTA) circuit with a controllable Gm value. A Gm value of the OTA circuit is detected based on a voltage of the capacitor which is charged by an output of the OTA circuit, and a cutoff frequency of the GmC circuit is set to a desired value by controlling the Gm value of the OTA circuit constant based on the detected Gm value.

    摘要翻译： 截止频率调整方法调整具有电容器的GmC滤波器电路和具有可控Gm值的运算跨导放大器（OTA）电路的截止频率。 基于由OTA电路的输出充电的电容器的电压检测OTA电路的Gm值，并且通过控制OTA电路的Gm值将GmC电路的截止频率设置为期望值 基于检测到的Gm值进行恒定。

    Filter circuit permitting adjustment of cutoff frequency
    6.
    发明申请
    Filter circuit permitting adjustment of cutoff frequency 有权
    滤波电路允许调节截止频率

    公开(公告)号：US20050176393A1

    公开(公告)日：2005-08-11

    申请号：US11043985

    申请日：2005-01-28

    申请人： Tatsuhiro Mizumasa ,  Koji Nozoe

    发明人： Tatsuhiro Mizumasa ,  Koji Nozoe

    IPC分类号： H03H7/01 ,  H04B1/06

    CPC分类号： H03H7/0153

    摘要： A filter circuit, having a plurality of selectable impedance elements, that has a cutoff frequency dependent on a selected impedance element, comprises a pulse generation circuit that supplies a variable frequency pulse with a successively increasing or decreasing frequency to an input of the filter circuit; and an impedance element selection unit that checks the attenuation of the output pulse of the filter circuit corresponding with the input of the variable frequency pulse and selects the plurality of impedance elements on the basis of the position of a pulse that is attenuated to or below a reference value.

    摘要翻译： 具有多个可选阻抗元件的滤波器电路具有取决于所选择的阻抗元件的截止频率，包括脉冲发生电路，其将连续递增或递减频率的可变频率脉冲提供给滤波器电路的输入端; 以及阻抗元件选择单元，其对与所述可变频率脉冲的输入相对应的所述滤波器电路的输出脉冲的衰减进行检查，并基于被衰减到或低于所述可变频率脉冲的脉冲的位置来选择所述多个阻抗元件 参考值。

    SEMICONDUCTOR INTEGRATED CIRCUIT
    7.
    发明申请
    SEMICONDUCTOR INTEGRATED CIRCUIT 有权
    半导体集成电路

    公开(公告)号：US20050162301A1

    公开(公告)日：2005-07-28

    申请号：US10855738

    申请日：2004-05-28

    申请人： Tatsuhiro Mizumasa ,  Atsushi Hitaka

    发明人： Tatsuhiro Mizumasa ,  Atsushi Hitaka

    IPC分类号： H03M1/00 ,  H03M1/06 ,  H03M1/16 ,  H03M1/44 ,  H03M1/66 ,  H03M1/34 ,  H03M1/12

    CPC分类号： H03M1/002 ,  H03M1/168 ,  H03M1/44 ,  H03M1/66

    摘要： A frequency detecting circuit 10 detects frequency of a sampling pulse SP, and outputs the detected frequency as a detection value VOUT. A current adjusting circuit 20 adjusts a power supply current lvd to be supplied to an AD converter 30 in accordance with the detection value VOUT. The power supply current lvd varies continuously so as to follow the sampling frequency. As a result, an optimum power supply current lvd can always be supplied in accordance with the operating frequency of the AD converter 30. That is, power consumption of the AD converter 30 can be reduced. Since the power supply current lvd can be adjusted in accordance with the sampling frequency, it is possible to form the AD converter 30 that has a wide frequency band and allows great versatility.

    摘要翻译： 频率检测电路10检测采样脉冲SP的频率，并将检测到的频率作为检测值VOUT输出。 电流调节电路20根据检测值VOUT来调整要提供给AD转换器30的电源电流lvd。 电源电流lvd连续变化，以便遵循采样频率。 结果，可以总是根据AD转换器30的工作频率提供最佳电源电流lvd。 也就是说，可以减少AD转换器30的功耗。 由于可以根据采样频率来调整电源电流lvd，所以可以形成具有宽频带的AD转换器30并且允许很大的通用性。