- 专利标题: RF ladder filter with simplified acoustic RF resonator parallel capacitance compensation
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申请号: US15004084申请日: 2016-01-22
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公开(公告)号: US09837984B2公开(公告)日: 2017-12-05
- 发明人: Nadim Khlat , Andrew F. Folkmann , Robert Aigner , Marcus Granger-Jones
- 申请人: RF Micro Devices, Inc.
- 申请人地址: US NC Greensboro
- 专利权人: Qorvo US, Inc.
- 当前专利权人: Qorvo US, Inc.
- 当前专利权人地址: US NC Greensboro
- 代理机构: Withrow & Terranova, P.L.L.C.
- 主分类号: H03H9/54
- IPC分类号: H03H9/54 ; H03H9/64 ; H03H9/60
摘要:
An RF ladder filter having a parallel capacitance compensation circuit is disclosed. The parallel capacitance compensation circuit is made up of a first inductive element with a first T-terminal and a first end coupled to a first ladder terminal and a second inductive element with a second T-terminal that is coupled to the first T-terminal of the first inductive element and a second end coupled to a second ladder terminal. Further included is a compensating acoustic RF resonator (ARFR) having a fixed node terminal and a third T-terminal that is coupled to the first T-terminal of the first inductive element and the second T-terminal of the second inductive element, and a finite number of series-coupled ladder ARFRs, wherein the parallel capacitance compensation circuit is coupled across one of the finite number of series-coupled ARFRs by way of the first ladder terminal and the second ladder terminal.
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