发明授权
- 专利标题: Notched saw image frequency rejection filter system
- 专利标题(中): 缺陷锯图像频率抑制滤波器系统
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申请号: US12589431申请日: 2009-10-23
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公开(公告)号: US08169279B2公开(公告)日: 2012-05-01
- 发明人: Orest Fedan
- 申请人: Orest Fedan
- 申请人地址: US MA Canton
- 专利权人: Lojack Operating Company, LP
- 当前专利权人: Lojack Operating Company, LP
- 当前专利权人地址: US MA Canton
- 代理机构: Iandiorio Teska & Coleman, LLP
- 主分类号: H03H9/64
- IPC分类号: H03H9/64 ; H03H9/52 ; H04B1/12
摘要:
A notched SAW image frequency rejection filter system includes a SAW filter having an input, an output and a ground output and an impedance matching network including a first matching inductance connected to the SAW filter output and a second matching inductance connected to the ground output of the SAW filter; the SAW filter having an inherent internal capacitance that produces a predetermined capacitive leakage current at the image frequency; an inherent internal inductance that produces an inductance leakage current at the image frequency; and a boosted inherent parasitic ground inductance at the ground output of the SAW filter for generating a voltage across the second matching inductance to produce a compensation current which is substantially opposite in phase and substantially matched in magnitude with the capacitive leakage current for reducing the capacitive leakage current and increasing the image frequency rejection.
公开/授权文献
- US20110095850A1 Notched saw image frequency rejection filter system 公开/授权日:2011-04-28
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