公开(公告)号：US20130335163A1

公开(公告)日：2013-12-19

申请号：US13852512

申请日：2013-03-28

申请人： Nokia Corporation

发明人： Sudhir AGGARWAL ,  Xiao Xiao

IPC分类号： H03H7/12

CPC分类号： H03H7/12 ,  H03H19/002

摘要： A variable bandwidth filter comprises a first filter branch in parallel with a second filter branch. The first filter branch comprises a first resistance in series with an input and a first output, and N parallel paths across the first output, each path comprising a corresponding capacitor in series with a corresponding switch and a common terminal. The second filter branch comprises a second resistance in series with the input and a second output, and N parallel paths across the second output, each path comprising an RC network in series with a switch and a common terminal. A clock tunes the first and second filter branches to a center frequency by controlling the switches of the first and second filter branches. A combiner produces a difference signal comprising a difference between the output of the first filter branch and the output of the second filter branch to provide a filter output having an adjustable bandwidth with reference to a center frequency. The bandwidth is adjusted by changing a value of at least one resistor or at least one capacitor in one or more of the first filter branch or the second filter branch.

摘要翻译： 可变带宽滤波器包括与第二滤波器分支并联的第一滤波器分支。 第一滤波器分支包括与输入和第一输出串联的第一电阻，以及横跨第一输出的N个并行路径，每个路径包括与相应开关和公共端子串联的相应电容器。 第二滤波器分支包括与输入和第二输出串联的第二电阻，以及跨越第二输出的N个并行路径，每个路径包括与开关和公共端子串联的RC网络。 时钟通过控制第一和第二滤波器分支的开关来调谐第一和第二滤波器分支到中心频率。 组合器产生包括第一滤波器分支的输出与第二滤波器分支的输出之间的差异的差分信号，以提供具有参考中心频率的可调节带宽的滤波器输出。 通过在第一滤波器分支或第二滤波器分支中的一个或多个中改变至少一个电阻器或至少一个电容器的值来调整带宽。

公开(公告)号：US09136815B2

公开(公告)日：2015-09-15

申请号：US13852512

申请日：2013-03-28

申请人： Nokia Corporation

发明人： Sudhir Aggarwal ,  Xiao Xiao

IPC分类号： H03H7/12 ,  H03H19/00

CPC分类号： H03H7/12 ,  H03H19/002

摘要： A variable bandwidth filter includes a first filter branch in parallel with a second filter branch. The first filter branch includes a first resistance in series with an input and a first output, and N parallel paths across the first output. The second filter branch includes a second resistance in series with the input and a second output, and N parallel paths across the second output. A clock tunes the first and second filter branches to a center frequency. A combiner produces a difference signal including a difference between the output of the first filter branch and the output of the second filter branch to provide a filter output having an adjustable bandwidth with reference to a center frequency. The bandwidth is adjusted by changing a value of at least one resistor or at least one capacitor in one or more of the first filter branch or the second filter branch.

摘要翻译： 可变带宽过滤器包括与第二过滤器分支并行的第一过滤器分支。 第一滤波器分支包括与输入和第一输出串联的第一电阻以及穿过第一输出的N个并行路径。 第二滤波器分支包括与输入和第二输出串联的第二电阻，以及穿过第二输出的N个并行路径。 时钟将第一和第二滤波器分支调谐到中心频率。 组合器产生包括第一滤波器分支的输出与第二滤波器分支的输出之间的差异的差分信号，以提供具有参考中心频率的可调节带宽的滤波器输出。 通过在第一滤波器分支或第二滤波器分支中的一个或多个中改变至少一个电阻器或至少一个电容器的值来调整带宽。