公开(公告)号：US07053697B2

公开(公告)日：2006-05-30

申请号：US11104496

申请日：2005-04-13

申请人： Ralph A. Duncan ,  Chun-Ying Chen ,  Young J. Shin

发明人： Ralph A. Duncan ,  Chun-Ying Chen ,  Young J. Shin

IPC分类号： H03K5/00

CPC分类号： H03H11/04 ,  H03D3/008 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/1483 ,  H03D7/165 ,  H03D2200/0025 ,  H03D2200/0043 ,  H03D2200/0047 ,  H04B1/30

摘要： An integrated circuit formed on a semiconductor chip, comprising a low pass filter circuit having a first resistor of a first resistance value and a capacitor of a first capacitance value, wherein the first resistance value and the first capacitance value determine a corner frequency of the filter; and a tuning circuit having a second resistor of a second resistance value, a switched-capacitor of a third resistance value and a comparator that compares two voltage signals to produce a control signal, wherein the control signal adjusts the first and second resistance values as a function of the third resistance value. The corner frequency of the filter can be adjusted by varying one or more reference voltage signals. In combination, the corner frequency of the filter is adjusted by changing the frequency of a clock that controls the switched-capacitor to decrease the circuit sensitivity.

摘要翻译： 一种形成在半导体芯片上的集成电路，包括具有第一电阻值的第一电阻器和第一电容值的电容器的低通滤波器电路，其中所述第一电阻值和所述第一电容值确定所述滤波器的转角频率 ; 以及调谐电路，具有第二电阻值的第二电阻器，第三电阻值的开关电容器和比较器，用于比较两个电压信号以产生控制信号，其中所述控制信号将所述第一和第二电阻值调整为 功能的第三个电阻值。 可以通过改变一个或多个参考电压信号来调整滤波器的转角频率。 通过组合，通过改变控制开关电容器的时钟频率来降低​​电路灵敏度来调节滤波器的转角频率。

公开(公告)号：US06894557B2

公开(公告)日：2005-05-17

申请号：US10767424

申请日：2004-01-30

申请人： Ralph A. Duncan ,  Chun-Ying Chen ,  Young J. Shin

发明人： Ralph A. Duncan ,  Chun-Ying Chen ,  Young J. Shin

IPC分类号： H04H20/00 ,  H03D3/00 ,  H03D7/14 ,  H03H11/04 ,  H03K5/00

CPC分类号： H03H11/04 ,  H03D3/008 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/1483 ,  H03D7/165 ,  H03D2200/0025 ,  H03D2200/0043 ,  H03D2200/0047 ,  H04B1/30

摘要： An integrated circuit formed on a semiconductor chip, comprising a low pass filter circuit having a first resistor of a first resistance value and a capacitor of a first capacitance value, wherein the first resistance value and the first capacitance value determine a corner frequency of the filter; and a tuning circuit having a second resistor of a second resistance value, a switched-capacitor of a third resistance value and a comparator that compares two voltage signals to produce a control signal, wherein the control signal adjusts the first and second resistance values as a function of the third resistance value. The corner frequency of the filter can be adjusted by varying one or more reference voltage signals. In combination, the corner frequency of the filter is adjusted by changing the frequency of a clock that controls the switched-capacitor to decrease the circuit sensitivity.

摘要翻译： 一种形成在半导体芯片上的集成电路，包括具有第一电阻值的第一电阻器和第一电容值的电容器的低通滤波器电路，其中所述第一电阻值和所述第一电容值确定所述滤波器的转角频率 ; 以及调谐电路，具有第二电阻值的第二电阻器，第三电阻值的开关电容器和比较器，用于比较两个电压信号以产生控制信号，其中所述控制信号将所述第一和第二电阻值调整为 功能的第三个电阻值。 可以通过改变一个或多个参考电压信号来调整滤波器的转角频率。 通过组合，通过改变控制开关电容器的时钟频率来降低​​电路灵敏度来调节滤波器的转角频率。

公开(公告)号：US06710644B2

公开(公告)日：2004-03-23

申请号：US09995795

申请日：2001-11-29

申请人： Ralph A. Duncan ,  Chun-Ying Chen ,  Young J. Shin

发明人： Ralph A. Duncan ,  Chun-Ying Chen ,  Young J. Shin

IPC分类号： H03K500

CPC分类号： H03H11/04 ,  H03D3/008 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/1483 ,  H03D7/165 ,  H03D2200/0025 ,  H03D2200/0043 ,  H03D2200/0047 ,  H04B1/30

摘要： An integrated circuit formed on a semiconductor chip, comprising a low pass filter circuit having a first resistor of a first resistance value and a capacitor of a first capacitance value, wherein the first resistance value and the first capacitance value determine a corner frequency of the filter; and a tuning circuit having a second resistor of a second resistance value, a switched-capacitor of a third resistance value and a comparator that compares two voltage signals to produce a control signal, wherein the control signal adjusts the first and second resistance values as a function of the third resistance value. The corner frequency of the filter can be adjusted by varying one or more reference voltage signals. In combination, the corner frequency of the filter is adjusted by changing the frequency of a clock that controls the switched-capacitor to decrease the circuit sensitivity.

摘要翻译： 一种形成在半导体芯片上的集成电路，包括具有第一电阻值的第一电阻器和第一电容值的电容器的低通滤波器电路，其中所述第一电阻值和所述第一电容值确定所述滤波器的转角频率 ; 以及调谐电路，具有第二电阻值的第二电阻器，第三电阻值的开关电容器和比较器，用于比较两个电压信号以产生控制信号，其中所述控制信号将所述第一和第二电阻值调整为 功能的第三个电阻值。 可以通过改变一个或多个参考电压信号来调整滤波器的转角频率。 通过组合，通过改变控制开关电容器的时钟频率来降低​​电路灵敏度来调节滤波器的转角频率。