发明授权
US09136815B2 Methods and apparatuses for implementing variable bandwidth RF tracking filters for reconfigurable multi-standard radios
有权
用于实现可重构多标准无线电的可变带宽RF跟踪滤波器的方法和装置
- 专利标题： Methods and apparatuses for implementing variable bandwidth RF tracking filters for reconfigurable multi-standard radios
- 专利标题（中）： 用于实现可重构多标准无线电的可变带宽RF跟踪滤波器的方法和装置
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申请号： US13852512申请日： 2013-03-28
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公开(公告)号： US09136815B2公开(公告)日： 2015-09-15
- 发明人: Sudhir Aggarwal , Xiao Xiao
- 申请人： Nokia Corporation
- 申请人地址： FI Espoo
- 专利权人： Nokia Technologies Oy
- 当前专利权人： Nokia Technologies Oy
- 当前专利权人地址： FI Espoo
- 代理机构： Harrington & Smith
- 主分类号： H03H7/12
- IPC分类号： H03H7/12 ; H03H19/00
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.
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