CN111684716A - 具有陷波滤波器的滤波器电路 - Google Patents
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Abstract
一种滤波器电路,在信号线中包括:带滤波器(BF),允许让有用频带通过;以及陷波滤波器(NF),串联地电路连接到带滤波器以滤除阻带频率。陷波滤波器包括多个并联分流元件(SE1…SE6)的串联电路,其中每个分流元件的频率相对于其他分流元件的频率发生偏移,分流元件的频率被分布(f1…F6)在陷波带上。所有分流元件可以被实现为包括具有不同间距的区域的SAW单端口谐振器(TRNF)。
Description
在蜂窝通信中,由PA、PA匹配和TX滤波器(例如,SAW双工器)组成的系统,或在相应前端模块中,阻带内的隔离可能太差以致不能符合指定频带的给定规格。因此,必须采取其他措施来改善不同带之间的隔离。
这样做的已知方法是在信号路径中包括陷波滤波器,该陷波滤波器滤除特定频率以在滤波器传递函数中产生极点。通常,一个陷波滤波器仅滤除一个单一频率,并且因此仅用于衰减一个杂散信号,以及仅改善一个特定频率下的隔离。引入任何其他陷波会不适当地增强串联电阻,从而产生不期望的损耗。
本发明的目的是改善在标准前端模块中同时操作的不同频带之间的隔离,而不会导致过多的附加损耗。
该目的和其他目的通过根据权利要求1的滤波器电路来实现。从属权利要求给出了包括有利特征的其他实施例。
想法是提供一种陷波滤波器,以用于滤除阻带频率。陷波滤波器与带滤波器串联地电路连接,并且包括多个并联分流元件的串联电路。分流元件在频率上相互偏移,因此提供了在陷波带上分布的多个阻带频率。根据单阻带频率的分布,这导致陷波滤波器具有宽陷波带。
分流元件中的任一分流元件在滤波器的传递函数中都不需要或提供极大极点,以足以滤除阻带频率。然而,较小分流元件的总和(分流元件中的每个分流元件提供较小的陷波)在极大宽带内改善隔离。通过为每个分流元件设置适当导纳并且选择分流元件的有用数目和分布,可以调整隔离。
选择陷波滤波器的总导纳并且将其设置为与已知分流元件的值相当的值,但是将其分布在多个分流元件上。因此,陷波滤波器所增加的总附加阻抗仅很小,并且不会扩展例如由单个分流元件所实现的已知陷波滤波器的阻抗。
作为优选分流元件,可以使用与信号线并联地电路连接的谐振器。任何种类的谐振器都是可能的。优选谐振器以与滤波器电路相同的技术实现。优选分流元件选自以声波操作的谐振器。如果带滤波器是SAW滤波器,则谐振器可以是SAW谐振器。因而,在BAW滤波器或LC滤波器的情况下,可以分别使用BAW谐振器和LC谐振器。
根据实施例,并联分流元件包括单端口SAW谐振器。更优选地,陷波滤波器包括单个单端口SAW谐振器,该单端口SAW谐振器仅具有换能器,该换能器具有两个汇流条以及交替连接到两个汇流条中的一个汇流条的多个换能器指部。两个相邻换能器指部的中心之间的指距定义陷波带内的阻带频率。在单端口谐振器中,提供了多个不同的指距,每个指距提供了具有相应阻带频率的分流元件。
分流元件中的每个分流元件仅由少量的指部组成。
根据优选实施例,在单个单端口谐振器中每个指距仅存在一次。因此,每对相邻指部具有不同的距离。
滤波器电路可以包括诸如SAW滤波器或BAW滤波器之类的声学滤波器。声学滤波器可以是双工器、共用器或更高的多工器(如四工器)的一部分。
带滤波器可以是带通、高通或低通。滤波器电路的优选应用是Tx滤波器,例如,需要改善Rx隔离的双工器内的Tx滤波器。本文中,陷波滤波器被设置为以通常位于相邻带中的相应Rx频率为中心的陷波带。
带滤波器可以包括DMS滤波器、梯形类型布置或晶格类型布置的电抗滤波器、LC滤波器、或混合滤波器,该混合滤波器使用不同技术将两个部分滤波器进行组合。
滤波器电路可以用于蜂窝移动设备的无线前端模块,例如,无线功率RF PAMiD前端模块。利用在这种模块中使用的滤波器电路,可以以系统中总RX隔离最大的这种方式调整TX RX陷波滤波器元件。
在PAMiD前端模块内,陷波带可以以前端模块中包括并且由该前端模块操作的相应其他滤波器电路的有用频带为中心。可替代地,其他滤波器电路可以是与PAMiD前端模块一起操作的单独电路。
在下文中,通过参考特定实施例和附图对滤波器电路进行更详细地解释。这些附图仅是示意性的,并没按比例绘制。
图1示出了现有技术的滤波器电路;
图2示出了图1的滤波器电路的传递曲线;
图3示出了根据实施例的滤波器电路;
图4A和图4B示出了图3的滤波器电路的传递曲线;
图5示出了在图3的实施例中可以用作并联谐振器的换能器;
图6示出了包括根据图3的滤波器电路的前端模块。
图1A示出了根据本领域的已知滤波器电路,该已知滤波器电路包括带滤波器BF、以及在信号线SL内串联地电路连接的陷波滤波器NF。带滤波器BF可以被实施为带通滤波器。陷波滤波器N包括与信号线SL并联电路连接的分流元件SE。如图1B所示,陷波滤波器可以包括具有谐振频率f0的单端口SAW谐振器R。由于将谐振器R电路连接为分流元件,谐振频率f0符合单个阻带频率。
图2示出了图1的滤波器电路的传递曲线。在该示例中,带通滤波器BF是Tx滤波器,并且通带符合Tx带。相应的Rx带位于Tx带上方。在该图中,Tx滤波器的所需的Rx隔离被描绘为矩形。图2的图形1示出了传递曲线,并且图形2的虚线描绘了相同滤波器电路但没有陷波滤波器的传递曲线。示出了曲线2不太令人满意,并且如曲线1中的所需的隔离仅可以使用陷波滤波器NF来实现。然而,由陷波的阻带频率f0产生的极点下方的隔离可能得以改善。
图3示出了根据本发明实施例的滤波器电路。滤波器电路包括带滤波器BF、以及在信号线SL内串联地电路连接的陷波滤波器NF。与图1不同,所提出的陷波滤波器NF包括一系列并联分流元件S1至S6。分流元件中的每个分流元件被指派给不同的阻带频率f1至f6。陷波滤波器可以由一系列低导纳的小陷波构成,每个小陷波不足以在传递曲线(导纳曲线S21)中产生有用极点。然而,如可以从图4B的曲线3中看出的(该图4B是图4A在Rx区域中的放大剪切图),当并联电路连接在一起时,总陷波滤波器NF产生宽陷波带NB3。作为参考,仅描绘的曲线1符合从根据图1和图2所示的滤波器电路实现的曲线1。可以看出,新陷波带NB3被产生为比根据“陷波带”NB1(如由根据图1的已知滤波器所实现)的极点Nf0更宽。
曲线3示出了在低于根据现有技术的曲线1的极点的频率处的改善隔离。因此,在衰减曲线1的最大值(最差衰减)比衰减曲线3的最大值更高(更差)时,整个Rx带的隔离得以改善。结果,如果有利于宽衰减而又不干扰最大值,则源自现有技术的陷波滤波器的单个极点的高衰减得以减小。
图5示出了SAW单端口谐振器R的换能器TRNF,该SAW单端口谐振器R可以在图3的滤波器电路的实施例中用作陷波滤波器NF。换能器具有两个汇流条,其中交叉指型换能器指部交替连接到两个汇流条。每两个相邻换能器指部具有中心到中心的指距d。换能器TRNF包括一系列n个不同的指距d1至dn,并且每个出现的指距都被指派给陷波滤波器NF的相应阻带频率,并且在传递曲线中产生小极点。指距d1至dn及其相应阻带频率相互偏移相同的量,并且因此均匀分布。
图6示出了包括根据图3的滤波器电路的前端模块FEM。本文中,带滤波器被实现为双工器的Tx滤波器TxF。相应Rx滤波器RxF与Tx滤波器TxF连接,以形成在相应Rx带和Tx带下操作的双工器。陷波滤波器NF被放置在功率放大器PA与Tx滤波器TxF之间。
所使用的术语和附图标记的列表
BF 带滤波器
d1,dx,dn 两个相邻换能器指部的中心之间的指距
f0 单个陷波滤波器的阻带频率
f1至f6 SE1至SE6的阻带频率
FEM PAMiD前端模块
N 陷波
NB 陷波带
NF 陷波滤波器
PA 功率放大器
R 单端口SAW谐振器
R 谐振器
RxF Rx滤波器
SE1至SE6 分流元件
SL 信号线
TR 具有…的换能器
TxF Tx滤波器
1
2 公共滤波器的导纳
3 带通滤波器的导纳
汇流条
双工器或多工器
滤波器电路
另一滤波器电路
匹配电路
邻近带
并联分流元件
阻带频率
有用频率带
Claims (9)
1.一种滤波器电路,所述滤波器电路在信号线(SL)中包括:
-带滤波器(BF),允许让有用频带通过;以及
-陷波滤波器(NF),串联地电路连接到所述带滤波器,以用于滤除阻带频率;
其中
-所述陷波滤波器包括数目为n的并联分流元件(SE)的串联电路,
-每个分流元件(SE1、SE2、...SEn)的频率相对于其他分流元件的频率发生偏移,所有分流元件被分布在陷波带上,
-所述陷波滤波器(NF)提供所述陷波带(NB)。
2.根据前述权利要求所述的滤波器电路,
其中所述并联分流元件(SE)选自并联地电路连接到所述信号线(SL)的谐振器(R),
其中每个分流元件具有约为普通陷波滤波器(NF)的导纳的1/n倍的较小导纳,其中n是分流元件的所述数目。
3.根据前述权利要求所述的滤波器电路,
其中所述并联分流元件(SE)选自以声波操作的谐振器(R)。
4.根据前述权利要求所述的滤波器电路,
其中所述并联分流元件(SE)包括单端口SAW谐振器。
5.根据前述权利要求中的一项所述的滤波器电路,
其中所述陷波滤波器(NF)包括单个单端口SAW谐振器,所述单个单端口SAW谐振器具有换能器,所述换能器具有两个汇流条以及交替连接到所述两个汇流条中的一个汇流条的多个换能器指部;
其中两个相邻换能器指部的中心之间的指距定义所述陷波带(NB)内的阻带频率;
其中所述单端口SAW谐振器的所述换能器包括多个不同的指距(d1、...dx、...dn),并且因此包括具有相应阻带频率的数目为n的不同的分流元件。
6.根据前述权利要求所述的滤波器电路,
其中所述换能器仅包括每个指距一次,使得每对相邻指部具有不同的距离。
7.一种PAMiD前端模块(FEM),包括根据前述权利要求中的一项所述的滤波器电路、功率放大器(PA)、以及匹配电路,其中在邻近带中操作的另一滤波器电路是所述PAMiD前端模块的一部分或与所述PAMiD前端模块一起操作的不同设备;
其中所述陷波带(NB)以所述邻近带为中心。
8.根据前述权利要求所述的PAMiD前端模块,
其中所述滤波器电路和所述另一滤波器电路是带通滤波器,并且是双工器或多工器的一部分,其中指派给滤波器电路的所述陷波带(NB)以所述双工器或多工器的相应其他滤波器电路的有用频带为中心。
9.根据前述权利要求所述的PAMiD前端模块,
其中所述滤波器电路是双工器的Tx滤波器,
其中所述陷波带(NB)符合同一双工器的Rx滤波器的有用带。
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PCT/EP2019/051976 WO2019154655A1 (en) | 2018-02-08 | 2019-01-28 | Filter circuit with a notch filter |
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DE102018102832B4 (de) | 2023-01-05 |
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CN111684716B (zh) | 2023-12-05 |
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