WO2022217971A1 - Filtre lc - Google Patents

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Publication number
WO2022217971A1
WO2022217971A1 PCT/CN2021/141614 CN2021141614W WO2022217971A1 WO 2022217971 A1 WO2022217971 A1 WO 2022217971A1 CN 2021141614 W CN2021141614 W CN 2021141614W WO 2022217971 A1 WO2022217971 A1 WO 2022217971A1
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WIPO (PCT)
Prior art keywords
resonators
resonator
inductance
filter
capacitor
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PCT/CN2021/141614
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English (en)
Chinese (zh)
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赖志国
刘海瑞
杨清华
唐兆云
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苏州汉天下电子有限公司
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Publication of WO2022217971A1 publication Critical patent/WO2022217971A1/fr

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks

Definitions

  • the present invention relates to the technical field of electronic communication devices, in particular to an LC filter.
  • LC filters are one of the key components of modern communication equipment and are currently widely used in mobile communication applications such as 4G and 5G.
  • omnipolar LC filters and elliptical LC filters are the two most common types of LC filters at present, both of which are usually composed of series resonators and parallel resonators. It consists of inductors and capacitors. Among them, the omnipolar LC filter has no out-of-band zeros, so the near-stop-band suppression is weak. In addition, the omnipolar LC filter also has the problem that the inductance value in some resonators is too large (usually it can reach more than 10nH or even higher). Those skilled in the art know that the size of an inductor is proportional to its inductance value, that is, the larger the inductance value, the larger the size of the inductor.
  • the inductor value exceeds a certain value (usually 5nH)
  • a certain value usually 5nH
  • the size of the inductor is no longer easy to implement on-chip integration. That is, the existing omnipolar LC filter has a problem that it is not easy to integrate on-chip.
  • the elliptical LC filter can improve the near-stop-band suppression to a certain extent by introducing an out-of-band zero point, but the inductance value of some resonators is too large and it is not easy to integrate on-chip. Still can't get it resolved.
  • an LC filter which comprises:
  • Both ends of the series branch are respectively connected to the input port and the output port;
  • each of the resonators includes a first inductor and a first capacitor connected in parallel;
  • the series branch is provided with a series unit at a position between two adjacent resonators, and the series unit is a second capacitor, or the series unit is a second inductor.
  • the number of the resonators is N, and the number of the series units is N-1, where N is an integer and N ⁇ 2; the input port side To the output port side, the first inductance in the i-th resonator has the same inductance value as the first inductance in the N+1-i-th resonator, and the i-th resonator has the same inductance value.
  • the first capacitor has the same capacitance value as the first capacitor in the N+1-ith resonator, wherein, if N is an even number, 1 ⁇ i ⁇ N/2, and if N is an odd number, 1 ⁇ i ⁇ (N-1)/2; from the input port side to the output port side, the jth series unit and the N-jth series unit have the same capacitance or inductance value, wherein, if N is 1 ⁇ j ⁇ N/2-1 for an even number, and 1 ⁇ j ⁇ (N-1)/2 if N is an odd number.
  • the first inductances in the at least two resonators have the same inductance value;
  • the first capacitors in the at least two resonators all have the same capacitance value.
  • the inductance values of the first inductor and the second inductor are both less than or equal to 5nH.
  • the series unit is the second capacitor
  • the number of the resonators when the number of the resonators is greater than or equal to 4, there is a coupling between the first inductances in the resonators of at least two non-adjacent orders. .
  • the LC filter in the LC filter, there exists a gap between the first inductance of the first resonator and the last one of the resonators from the input port side to the output port side. coupling.
  • one of the first resonator from the input port side to the output port side and the first inductance in the penultimate resonator There is coupling between the two resonators from the input port side to the output port side and the first inductance in the last one of the resonators; or the input port side to There is a coupling between the first of the resonators on the output port side and the first inductance in the penultimate one of the resonators, and between the second and the last of the resonators There is coupling between the first inductors.
  • the LC filter there exists a gap between the first inductance of the first resonator and the last one of the resonators from the input port side to the output port side. coupling, and there is a coupling between the first inductance in the first of the resonators and the penultimate one of the resonators; or the first of the resonances from the input port side to the output port side there is a coupling between the resonator and the first inductance in the last of the resonators, and there is a coupling between the second of the resonators and the first inductance in the last of the resonators; or the There is coupling between the first inductance of the first said resonator and the last one of the resonators from the input port side to the output port side, the first said resonator and the second to last said There is a coupling between the first inductances in a resonator and a coupling between the first inductances in a resonator and
  • the LC filter further includes a third capacitor, the third capacitor is disposed on the series branch, at the input port and the first side from the input port side to the output port side Between each of the resonators; and/or a fourth capacitor, the fourth capacitor is provided on the series branch, the last resonator and the output from the input port side to the output port side between ports.
  • the LC filter provided by the present invention includes an input port, an output port, a series branch, and at least two resonators; two ends of the series branch are respectively connected to the input port and the output port; the At least two resonators are connected in parallel to the series branch, wherein each of the resonators includes a first inductor and a first capacitor connected in parallel; the series branch is located between two adjacent resonators A series unit is arranged at the position of , and the series unit is the second capacitor or the series unit is the second inductor.
  • the LC filter provided by the present invention has a certain improvement in the near-stop-band suppression.
  • the inductances of the LC filter provided by the present invention can be realized by a small inductance value. That is to say, compared with the existing LC filter, the LC filter provided by the present invention is easier to realize on-chip integration.
  • FIG. 1 is a circuit diagram of a typical omnipolar LC filter in the prior art
  • FIG. 2 is a circuit diagram of a typical elliptical LC filter in the prior art
  • Fig. 3 is the amplitude-frequency response curve of the omnipolar LC filter shown in Fig. 1;
  • Fig. 4 is the amplitude-frequency response curve of the elliptic LC filter shown in Fig. 2;
  • FIG. 5 is a circuit diagram of an LC filter according to a preferred embodiment of the present invention.
  • FIG. 6 is a circuit diagram of an LC filter according to another preferred embodiment of the present invention.
  • Fig. 7 is the amplitude frequency response curve of the LC filter shown in Fig. 5;
  • Fig. 8 is the amplitude frequency response curve of the LC filter shown in Fig. 6;
  • Fig. 9 is the amplitude-frequency response curve after introducing coupling between the first resonator in the structure shown in Fig. 5 and the first inductance in the last resonator;
  • Fig. 10 shows the coupling introduced between the first resonator and the first inductance in the last resonator of the structure shown in Fig. 5, and the introduction between the first inductance in the first resonator and the penultimate resonator The coupled amplitude-frequency response curve;
  • FIG. 11 is a circuit diagram of an LC filter according to yet another preferred embodiment of the present invention.
  • the present invention provides a kind of LC filter, this LC filter comprises:
  • Both ends of the series branch are respectively connected to the input port and the output port;
  • each of the resonators includes a first inductor and a first capacitor connected in parallel;
  • the series branch is provided with a series unit at a position between two adjacent resonators, and the series unit is a second capacitor, or the series unit is a second inductor.
  • the LC filter provided by the present invention includes an input port and an output port, the input port is used for inputting the signal to be filtered, and the output port is used for outputting the signal of a specific frequency obtained after filtering.
  • the LC filter provided by the present invention further includes a series branch and at least two resonators.
  • the one series branch is arranged between the input port and the output port, that is, one end of the series branch is connected to the input port and the other end is connected to the output port.
  • the at least two resonators are connected in parallel to the series branch, that is, one end of the resonator is connected to the series branch and the other end is grounded.
  • the resonator includes an inductance (referred to as a first inductance hereinafter) and a capacitance (referred to as a first capacitance hereinafter), wherein the first inductance and the second capacitor are connected in parallel.
  • a series unit is arranged at a position between two adjacent resonators. Specifically, if the number of resonators is two, a series unit is provided on the series branch, two ends of the series unit are respectively connected to the input port and the output port, and a resonator is connected in parallel between the input port and the series unit On the node of , another resonator is connected in parallel to the node between the series unit and the output port. If the number of resonators is greater than two, at least two series units are provided on the series branch, wherein the specific number of series units should be one less than the number of resonators.
  • a plurality of series units are connected in series, wherein the input terminal of the first series unit is connected to the input port, the output terminal of the last series unit is connected to the output port, and the resonators are connected in parallel to the input port and the first series unit respectively.
  • all the series units on the series branch are capacitors (represented by the second capacitor below), or alternatively, all the series units on the series branch are inductors (represented by the second inductance below).
  • all the first inductors and all the second inductors can be implemented by using inductors with relatively small inductance values. Specifically, the inductance values of all the first inductors and all the second inductors do not exceed 5nH.
  • the existing omnipolar LC filter and the LC filter provided by the present invention work at the same frequency, all the inductances of the LC filter provided by the present invention can be realized by a small inductance value, and can be completely realized by on-chip integrated to achieve. That is to say, compared with the existing omnipolar LC filter, the LC filter provided by the present invention is easier to realize on-chip integration. At the same time, the near-stopband suppression of the LC filter provided by the present invention is also enhanced.
  • the LC filter provided by the present invention has symmetry in structure. Specifically, since a series unit is disposed between two adjacent resonators, the number of resonators is one more than the number of series units. It is assumed that the number of resonators is N and the number of series units is N-1, where N is an integer and 2 or more.
  • the symmetry of the LC filter in this embodiment means: for the resonator, from the input port side to the output port side, the first inductance in the i-th resonator and the N+1-i-th resonator in the The first inductance has the same inductance value, and the first capacitor in the i-th resonator has the same capacitance value as the first capacitor in the N+1-i-th resonator, where, if N is an even number, 1 ⁇ i ⁇ N/2, if N is an odd number, 1 ⁇ i ⁇ (N-1)/2.
  • the jth series unit and the N-jth series unit have the same capacitance value or inductance value, wherein, if N is an even number, 1 ⁇ j ⁇ N/2-1, if N is an odd number, then 1 ⁇ j ⁇ (N-1)/2.
  • One inductor has the same inductance value
  • the first capacitor has the same capacitance value
  • the first series unit and the third series unit have the same capacitance value or the same inductance value.
  • One inductor has the same inductance value
  • the first capacitor has the same capacitance value
  • the first series unit and the fourth series unit have the same capacitance value or the same inductance value
  • the second series unit and the third series unit have the same capacitance value or the same inductance value.
  • the first inductances in all the resonators are designed to have the same inductance value.
  • the first capacitors in all the resonators are designed to have the same capacitance value. In this way, the design of the LC filter can be further simplified.
  • the first inductances in all the resonators can also be designed to have the same inductance value; when the series unit is the second inductor, the first capacitors in all resonators can also be designed to have the same capacitance value.
  • the structure of the LC filter is not asymmetric, but all the first inductors have the same inductance value, or all the first capacitors have the same capacitance value, the design of the LC filter can be simplified to a certain extent.
  • the LC filter provided by the present invention will be described below with specific embodiments in conjunction with FIGS. 1 to 8 .
  • LC filters are designed, represented by LC filter 1, LC filter 2, LC filter 3 and LC filter 4, respectively.
  • the LC filter 1 is a typical omnipolar LC filter in the prior art
  • the LC filter 2 is a typical elliptical filter in the prior art
  • the LC filter 3 and the LC filter 4 are both of the present invention.
  • the provided LC filter differs in that the series unit in the LC filter 3 is the second capacitor, and the series unit in the LC filter 4 is the second inductor.
  • the four LC filters are suitable for 5G communications, and their operating frequency bands are all 4.4GHz to 5GHz.
  • the LC filter 1 includes an input port, an output port, two series resonators connected in series between the input port and the output port, and two parallel resonators connected in parallel between the input port and the output port device.
  • the two series resonators are respectively a series resonator S A1 and a series resonator S A2 , wherein the series resonator S A1 is composed of a series inductance L A2 and a capacitor C A2 , and the series resonator S A2 is composed of a series inductance L A4 and capacitor C A4 .
  • the two parallel resonators are the parallel resonator P A1 and the parallel resonator P A2 respectively, the parallel resonator P A1 is connected in parallel to the node between the input port and the resonator S A1 , and the parallel resonator P A2 is connected in parallel with the series resonator S on the node between A1 and the series resonator S A2 .
  • the parallel resonator P A1 is composed of the parallel inductance L A1 and the capacitor C A1
  • the parallel resonator P A2 is composed of the parallel inductance L A3 and the capacitor C A3 .
  • the inductance value of the inductor L A2 in the series resonator S A1 is 16.31nH
  • the capacitance value of the capacitor C A2 is 73.4fF
  • the inductance value of the inductor L A4 in the series resonator S A2 is 10.57nH
  • the capacitance value of the capacitor C A4 is 10.57nH.
  • the inductance value of the inductor LA1 in the parallel resonator P A1 is 283.2pH
  • the capacitance value of the capacitor C A1 is 4.228pF
  • the inductance value of the inductor L A3 in the parallel resonator P A2 is 183.5pH
  • the capacitance value of the capacitor C A3 The value is 6.524pF.
  • the LC filter 2 includes an input port, an output port, two series resonators connected in series between the input port and the output port, and three parallel resonators connected in parallel between the input port and the output port device.
  • the two series resonators are respectively a series resonator S B1 and a series resonator S B2 , wherein the series resonator S B1 is composed of a series inductance L B2 and a capacitor C B2 , and the series resonator S B2 is composed of a series inductance L B5 and capacitor C B5 .
  • the three parallel resonators are the parallel resonator P B1 , the parallel resonator P B2 , and the parallel resonator P B3 , respectively.
  • the parallel resonator PB1 is connected in parallel to the node between the input port and the resonator SB1
  • the parallel resonator PB2 and the parallel resonator PB3 are connected in parallel to the node between the series resonator SB1 and the series resonator SB2 .
  • the parallel resonator P B1 is composed of an inductance L B1 and a capacitor C B1 connected in parallel
  • the parallel resonator P B2 is composed of an inductance L B3 and a capacitor C B3 connected in series
  • the parallel resonator P B3 is composed of an inductance L B4 and a capacitor C B4 connected in series .
  • the inductance value of the inductor L B2 in the series resonator S B1 is 19.58nH
  • the capacitance value of the capacitor C B2 is 58.56fF
  • the inductance value of the inductor L B5 in the series resonator S B2 is 7.253nH
  • the capacitance value of the capacitor C B5 is 7.253nH.
  • the inductance value of inductor LB1 in parallel resonator P B1 is 339.4pH
  • the capacitance value of capacitor C B1 is 3.379pF
  • the inductance value of inductor L B3 in parallel resonator P B2 is 3.075nH
  • the capacitance value of capacitor C B3 is 3.075nH
  • the value is 528.3fF
  • the inductance value of the inductor LB4 in the parallel resonator P B3 is 2.17nH
  • the capacitance value of the capacitor C B4 is 372.9F.
  • the LC filter 3 includes an input port, an output port, three second capacitors connected in series between the input port and the output port, and four resonators connected in parallel between the input port and the output port .
  • the three second capacitors are a second capacitor C 5 , a second capacitor C 6 and a second capacitor C 7 in sequence from the input port side to the output port side.
  • the three resonators are respectively the resonator P 1 , the resonator P 2 , the resonator P 3 and the resonator P 4 , wherein the resonator P 1 is connected in parallel to the node between the input port and the second capacitor C 5 , and the resonator P2 is connected in parallel to the node between the second capacitor C5 and the second capacitor C6 , the resonator P3 is connected in parallel to the node between the second capacitor C6 and the second capacitor C7 , and the resonator P4 is connected in parallel to the node between the second capacitor C6 and the second capacitor C7 . on the node between the second capacitor C7 and the output port.
  • the resonator P1 is composed of the first inductor L1 and the first capacitor C1 connected in parallel
  • the resonator P2 is composed of the first inductor L2 and the first capacitor C2 connected in parallel
  • the resonator P3 is composed of the first inductor connected in parallel.
  • L 3 and a first capacitor C 3 are formed
  • the resonator P 4 is formed by a first inductance L 4 and a first capacitor C 4 connected in parallel.
  • the capacitance values of the second capacitor C 5 , the second capacitor C 6 and the second capacitor C 7 are respectively 551.1fF, 443.6fF and 551.1fF; the first inductor L 1 , the first inductor L 2 , and the first inductor L 3 and the inductance values of the first inductor L 4 are the same as 277.1pH; the capacitance values of the first capacitor C 1 , the first capacitor C 2 , the first capacitor C 3 and the first capacitor C 4 are 3.677pF, 3.233pF, 3.233pF and 3.677pF.
  • the difference between the LC filter 4 shown in FIG. 6 and the LC filter 3 shown in FIG. 5 is only that the series unit is the second inductor, that is, the second inductor L 5 , the second inductor L 6 and the second inductor L 7 are used respectively.
  • the structure of the LC filter 4 shown in FIG. 6 can be obtained by replacing the second capacitor C 5 , the second capacitor C 6 and the second capacitor C 7 in FIG. 5 .
  • the structure of the LC filter 4 will not be described in detail here.
  • the inductance values of the second inductance L 5 , the second inductance L 6 and the second inductance L 7 are 2.09nH, 2.596nH and 2.09nH respectively; the first inductance L 1 , the first inductance L 2 and the first inductance L 3 And the inductance values of the first inductance L4 are 307.2nH , 348.4nH, 348.4nH and 307.2nH, respectively.
  • the capacitance values of the first capacitor C 1 , the first capacitor C 2 , the first capacitor C 3 and the first capacitor C 4 are all 4.228pF.
  • FIG. 3 is the amplitude-frequency response curve of the omnipolar LC filter shown in FIG. 1
  • FIG. 4 is the amplitude-frequency response curve of the elliptical LC filter shown in FIG. 2 Response curve
  • Figure 7 is the amplitude-frequency response curve of the LC filter shown in Figure 5
  • Figure 8 is the amplitude-frequency response curve of the LC filter shown in Figure 6.
  • the inductance values of the inductance L B2 and the inductance L B5 are both larger than 5nH (the inductance value of the inductance L B2 is much larger than 5nH).
  • All inductances (including the first inductance and the second inductance) in the LC filter 3 have inductance values lower than 1 nH.
  • the inductance values of all the inductances (including the first inductance and the second inductance) in the LC filter 4 are lower than 3nH. That is, compared with the prior art, the LC filter provided by the present invention is easier to realize on-chip integration.
  • LC filter 3 has enhanced roll-off at the left edge and near stopband suppression on the left, and LC filter 4 is at the right edge.
  • the roll-off and near stopband rejection on the right is enhanced.
  • the series unit is the second capacitor
  • the coupling can be formed between the first inductances.
  • the first inductance can also be realized by means of magnetic circuit coupling or circuit coupling coupling between.
  • the coupling coefficient between the first inductances needs to be set according to actual design requirements, which is not limited herein. More preferably, when the number of resonators is greater than or equal to 4, the resonators with coupling are not adjacent, that is, there is coupling between the first inductances in the resonators of non-adjacent orders. More preferably, the number of resonators is an even number of 4 or more.
  • there is a coupling between the first resonator from the input port side to the output port side and the first inductance in the last resonator, which introduces a zero near the stopband on the left, further making the left Edge roll-off and near stopband rejection on the left are enhanced.
  • a coupling (coupling coefficient equal to 1 %) is introduced between the first inductance L1 and the first inductance L4, and between the first inductance L1 and the first inductance L3
  • coupling coefficient is equal to 3.7%
  • the amplitude-frequency response curve of the LC filter after the coupling is introduced is shown in Figure 10. It can be seen from Figure 10 that, compared with the LC filter without coupling as shown in Figure 5, the roll-off of the left edge and the near-stopband suppression on the left side of the LC filter with the introduction of coupling, as well as the roll-off of the right edge and the right near stopband rejection are further enhanced.
  • the LC filter has structural symmetry, except by passing between the first inductance in the first resonator and the last resonator, and in the first resonator and the penultimate resonator
  • a zero point can be introduced near the stop band on the right side, so that the roll-off of the right edge and the suppression of the near stop band on the right side are obtained. strengthen.
  • There is a coupling between the first inductances of so that the right edge roll-off and the right near stopband rejection are enhanced.
  • introducing coupling between the first inductance in the first resonator and the last resonator, and between the first inductance in the first resonator and the penultimate resonator can be The left and right near stopbands respectively introduce zeros. between the first inductance in the first resonator and the last resonator, between the first resonator and the first inductance in the penultimate resonator, and between the second resonator and the last resonator Coupling is introduced between the first inductors in , and zeros can also be introduced into the left and right near stopbands respectively.
  • the coupling coefficient between the first inductances by adjusting the coupling coefficient between the first inductances, the specific position of the zero point and the magnitude of the suppression outside the zero point can be adjusted.
  • the former method is to introduce zero points through the coupling between two groups of first inductors
  • the latter method is to introduce zero points through three groups of first inductors coupling between to introduce zeros.
  • the latter method introduces more coupling between a group of first inductors, on the one hand, it can make the adjustment of the zero point position and the suppression outside the zero point more flexible, on the other hand It is also more convenient to adjust the zero point to the desired position while keeping the outboard suppression of the zero point within the desired range.
  • the LC filter provided by the present invention further includes a third capacitor and/or a fourth capacitor, wherein the third capacitor is arranged on the series branch and is located at the input port and the first resonance from the input port side to the output port side Between the resonators, a fourth capacitor is provided on the series branch between the last resonator from the input port side to the output port side and the output port.
  • the third capacitor helps to adjust the impedance matching of the input port
  • the fourth capacitor helps to adjust the impedance matching of the output port.
  • the specific parameters of the third capacitor and the fourth capacitor need to be set according to actual design requirements, which is not limited herein.
  • FIG. 11 is based on the LC filter shown in FIG. 5 .
  • a third capacitor C p1 is set at the input port and a fourth capacitor C p2 is set at the output port.
  • the third capacitor C p1 is set at the input port.
  • a fourth capacitance C p2 is provided between the output port and the connection node of the resonator P 4 and the series branch.
  • FIG. 11 is only a schematic example.
  • the settings of the third capacitor and the fourth capacitor are also applicable. This is not an exhaustive list of all possible LC filter structures.
  • the LC filter provided by the present invention includes an input port, an output port, a series branch, and at least two resonators; two ends of the series branch are respectively connected to the input port and the output port; the At least two resonators are connected in parallel to the series branch, wherein each of the resonators includes a first inductor and a first capacitor connected in parallel; the series branch is located between two adjacent resonators A series unit is arranged at the position of , and the series unit is the second capacitor or the series unit is the second inductor.
  • the LC filter provided by the present invention has a certain improvement in the near-stop-band suppression.
  • the inductances of the LC filter provided by the present invention can be realized by a small inductance value. That is to say, compared with the existing LC filter, the LC filter provided by the present invention is easier to realize on-chip integration.

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Abstract

L'invention concerne un filtre LC. Le filtre LC comprend : un orifice d'entrée, un orifice de sortie, une branche série et au moins deux résonateurs, deux extrémités de la branche série étant respectivement connectées à l'orifice d'entrée et à l'orifice de sortie ; lesdits au moins deux résonateurs étant connectés en parallèle à la branche série, et chacun des résonateurs comprenant un premier inducteur et un premier condensateur, qui sont connectés en parallèle ; et la branche série est pourvue d'une unité série à une position entre deux résonateurs adjacents, et l'unité série est un deuxième condensateur, ou l'unité série est un deuxième inducteur. Le filtre LC a les caractéristiques d'être facilement intégré sur une puce et d'avoir une grande performance de suppression de bande d'arrêt proche.
PCT/CN2021/141614 2021-04-16 2021-12-27 Filtre lc WO2022217971A1 (fr)

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CN114640306A (zh) * 2022-03-25 2022-06-17 安徽安努奇科技有限公司 谐振器、滤波器和多工器

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