WO2020168958A1 - Filtre passe-bande et duplexeur - Google Patents

Filtre passe-bande et duplexeur Download PDF

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Publication number
WO2020168958A1
WO2020168958A1 PCT/CN2020/074878 CN2020074878W WO2020168958A1 WO 2020168958 A1 WO2020168958 A1 WO 2020168958A1 CN 2020074878 W CN2020074878 W CN 2020074878W WO 2020168958 A1 WO2020168958 A1 WO 2020168958A1
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WO
WIPO (PCT)
Prior art keywords
parallel
resonator
resonators
inductor
series
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PCT/CN2020/074878
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English (en)
Chinese (zh)
Inventor
庞慰
蔡华林
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天津大学
诺思(天津)微系统有限责任公司
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Publication of WO2020168958A1 publication Critical patent/WO2020168958A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/547—Notch filters, e.g. notch BAW or thin film resonator filters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to the field of semiconductors and micro-electromechanical systems, in particular to a band-pass filter and a duplexer.
  • the performance requirements of the RF front-end are becoming more and more stringent.
  • the wireless communication system is developing in the direction of multi-function, multi-frequency band, and multi-protocol, which poses a higher challenge to the RF front-end in wireless communication equipment.
  • the performance of the filter plays a decisive role in the performance of the RF front-end. Therefore, there is a very urgent need for continuous improvement of filter performance.
  • the prior art LC bandpass filter usually includes an LC series resonant network on a series path and two parallel resonant networks on a parallel path.
  • the series resonant network can be replaced with a parallel resonant network or even a single L or C
  • the parallel resonant network can also be replaced with a series resonant network or a single L or C.
  • the existing LC bandpass filter can use FBAR to replace the capacitor in it to improve the roll-off, but the frequency adjustment range of FBAR is relatively small.
  • FBAR frequency adjustment range of FBAR is relatively small.
  • For the wideband filter such a wide frequency interval cannot be achieved on the same die, so it is necessary Two die, one is set at around 3.3GHz and the other is set at 3.9GHz. This brings about high cost and difficult technical problems.
  • the present invention provides a band-pass filter and a duplexer, which can improve the roll-off of the band-pass filter and the duplexer and increase the frequency adjustment range of the filter by changing the structure of the band-pass filter.
  • a band pass filter is provided.
  • the band pass filter is located between an input terminal and an output terminal and includes:
  • At least one group of the parallel resonator and the series resonator is formed by connecting a Lamb wave resonator and an inductor, and the other two groups of resonators are formed by one of a thin film bulk acoustic resonator (FBAR) or a capacitor. Connected with inductor.
  • FBAR thin film bulk acoustic resonator
  • the two sets of parallel resonators are all formed by connecting an inductor and a lamb wave resonator in parallel, and the inductor and the lamb wave resonator in the parallel resonator are both connected to a ground terminal.
  • the two sets of parallel resonators are all formed by connecting an inductor and a Lamb wave resonator in parallel, and the series resonator is formed by connecting an inductor and a capacitor in series.
  • the two sets of parallel resonators are formed by connecting inductors and lamb wave resonators in parallel, and the series resonators are formed by connecting inductors and lamb wave resonators in series.
  • one set of the two sets of parallel resonators is formed by connecting an inductor and a Lamb wave resonator in parallel, and one set is formed by connecting an inductor and a capacitor in parallel.
  • the wave resonators are all connected to the ground terminal.
  • one set of the two sets of parallel resonators is formed by connecting an inductor and a Lamb wave resonator in parallel, and one set is formed by connecting an inductor and a capacitor in parallel, and the series resonator is formed by connecting an inductor and a capacitor in series. Connected.
  • one set of the two sets of parallel resonators is formed by connecting an inductor and a Lamb wave resonator in parallel, and one set is formed by connecting an inductor and a capacitor in parallel, and the series resonator is formed by connecting an inductor and a Lamb wave resonator in parallel. Wave resonators are connected in series.
  • the series resonator is formed by connecting an inductor and a Lamb wave resonator in series
  • the two sets of parallel resonators are both formed by connecting an inductor and a capacitor in parallel
  • the inductor in the parallel resonator The capacitors are all connected to the ground terminal.
  • a duplexer including:
  • a transmitting filter connected between the transmitting terminal and the antenna terminal and including a series resonator and a parallel resonator connected in a ladder form;
  • a receiving filter which is connected between the receiving end and the antenna end and includes a series resonator and a parallel resonator connected in a ladder form
  • the transmitting filter and the receiving filter are the above-mentioned band pass filters.
  • the present invention introduces the LWR lamb wave resonator in the design of the band-pass filter and the duplexer, and replaces the capacitor at a specific position of the band-pass filter with the LWR.
  • the LWR sets the frequency in the passband of the filter.
  • Side can effectively improve the roll-off
  • LWR can adjust the frequency through the physical thickness of each layer of the device and the spacing of the surface pattern.
  • the frequency adjustment range is relatively wide. For high bandwidth, especially the ultra-wideband filter composed of LC filter In the case of a wide frequency realization, it can be ensured that the roll-off improvement on both sides can be achieved by using the same die.
  • the present invention has obvious advantages in improving the roll-off and increasing the frequency adjustment range of the filter.
  • Figure 1 is a circuit structure diagram of a prior art band pass filter.
  • Figure 2 is a simulation curve of a prior art band pass filter.
  • FIG. 3 is a circuit structure diagram of the band pass filter of the first embodiment of the present application.
  • Fig. 4 is a simulation curve of the band pass filter of the first embodiment of the present application.
  • Fig. 5 is a circuit structure diagram of a band pass filter according to a second embodiment of the present application.
  • Fig. 7 is a circuit structure diagram of a band pass filter according to a fourth embodiment of the present application.
  • FIG. 8 is a circuit structure diagram of a band pass filter according to a fifth embodiment of the present application.
  • FIG. 9 is a circuit structure diagram of a band pass filter according to a sixth embodiment of the present application.
  • FIG. 10 is a circuit structure diagram of a band pass filter according to a seventh embodiment of the present application.
  • the existing band-pass filter is shown in FIG. 1.
  • the band-pass filter includes an LC parallel resonator 10 formed by connecting an inductor L1 and a capacitor C1 in parallel between the input terminal P1 and the output terminal P2, and
  • the LC parallel resonator 20 formed by connecting the inductor L2 and the capacitor C2 in parallel, and between the LC parallel resonator 10 and the LC parallel resonator 20, an LC series formed by connecting the inductor L3 and the capacitor C3 in series is connected in series Resonator 30.
  • Figure 2 shows the simulation results of the existing band-pass filter. It can be seen from FIG. 2 that the frequency adjustment range of the LC bandpass filter in the prior art is relatively narrow. In the wide frequency range of 3.2 GHz and 3.9 GHz, it is impossible to achieve two frequency points to improve roll-off on the same chip.
  • FIG. 3 shows a circuit structure diagram of the band pass filter of the first embodiment of the present application.
  • a band-pass filter, the band-pass filter between the input terminal P1 and the output terminal P2 includes:
  • the parallel resonator 10 formed by connecting the inductor L1 and the lamb wave resonator LWR1 in parallel and the parallel resonator 20 formed by connecting the inductor L2 and the lamb wave resonator LWR2 in parallel are connected in parallel with the parallel resonator 10
  • an LC series resonator 30 formed by connecting an inductor L3 and a capacitor C3 in series is connected in series
  • the inductor L1, the inductor L2, the lamb wave resonator LWR1, and the lamb wave resonator LWR2 are all connected to the ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to The output terminal P2 is connected.
  • Figure 4 shows the simulation results of the existing band-pass filter. It can be seen from Fig. 4 that the roll-off of the band-pass filter in the first embodiment of the present invention around 3.32GHz and 3.86GHz is significantly improved. In the wide frequency range of 3.2GHz and 3.9GHz, both sides can be realized on the same chip. Roll-off improvement.
  • Fig. 5 shows a circuit structure diagram of a band pass filter according to a second embodiment of the present application.
  • a band-pass filter the band-pass filter between the input terminal P1 and the output terminal P2, includes:
  • the parallel resonator 10 formed by connecting the inductor L1 and the lamb wave resonator LWR1 in parallel and the parallel resonator 20 formed by connecting the inductor L2 and the lamb wave resonator LWR2 in parallel are connected in parallel with the parallel resonator 10
  • a series resonator 30 formed by connecting an inductor L3 and a Lamb wave resonator LWR3 in series is connected in series,
  • the inductor L1, the inductor L2, the lamb wave resonator LWR1, and the lamb wave resonator LWR2 are all connected to the ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to The output terminal P2 is connected.
  • Fig. 6 shows a circuit structure diagram of a band pass filter according to a third embodiment of the present application.
  • a band-pass filter the band-pass filter between the input terminal P1 and the output terminal P2, includes:
  • the inductor L1, the inductor L2, the lamb wave resonator LWR1, and the capacitor C1 are all connected to ground, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2 .
  • Fig. 7 shows a circuit structure diagram of a band pass filter according to a fourth embodiment of the present application.
  • a band-pass filter the band-pass filter between the input terminal P1 and the output terminal P2, includes:
  • the inductor L1, the inductor L2, the capacitor C1, and the lamb wave resonator LWR2 are all connected to ground, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2 .
  • FIG. 8 shows a circuit structure diagram of a band pass filter according to a fifth embodiment of the present application.
  • a band-pass filter the band-pass filter between the input terminal P1 and the output terminal P2, includes:
  • the inductor L1, the inductor L2, the lamb wave resonator LWR1, and the capacitor C2 are all connected to the ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2 .
  • FIG. 9 shows a circuit structure diagram of a band pass filter according to a sixth embodiment of the present application.
  • a band-pass filter the band-pass filter between the input terminal P1 and the output terminal P2, includes:
  • the inductor L1, the inductor L2, the capacitor C1, and the lamb wave resonator LWR2 are all connected to ground, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2 .
  • FIG. 10 shows a circuit structure diagram of a band pass filter according to a seventh embodiment of the present application.
  • a band-pass filter the band-pass filter is between the input terminal P1 and the output terminal P2, and includes:
  • the parallel resonator 10 formed by connecting the inductor L1 and the capacitor C1 in parallel, and the parallel resonator 20 formed by connecting the inductor L2 and the capacitor C2 in parallel are connected in series between the parallel resonator 10 and the parallel resonator 20
  • the inductor L1, the inductor L2, the capacitor C1, and the capacitor C2 are all connected to the ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2.
  • capacitors in the above embodiments can be replaced in whole or in part by a film bulk acoustic resonator (FBAR).
  • FBAR film bulk acoustic resonator
  • the disclosed system and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Filters And Equalizers (AREA)

Abstract

L'invention concerne un filtre passe-bande et un duplexeur. Le filtre passe-bande est situé entre une borne d'entrée (P1) et une borne de sortie (P2), et comprend : deux résonateurs connectés en parallèle (10, 20) et un résonateur connecté en série (30) connecté entre les deux résonateurs connectés en parallèle (10, 20), au moins l'un des résonateurs connectés en parallèle (10, 20) et le résonateur connecté en série (30) est formé par connexion d'un résonateur à ondes de Lamb (LWR) et d'une bobine d'induction, et les deux autres résonateurs sont formés par connexion d'une bobine d'induction et d'un résonateur acoustique de volume à film (FBAR) ou d'un condensateur. L'invention remplace un condensateur à une position spécifique du filtre passe-bande avec un résonateur à ondes de Lamb (LWR). Le LWR améliore efficacement l'atténuation par réglage d'une fréquence de chaque côté d'une bande passante du filtre, et permet également un réglage de fréquence par l'intermédiaire d'une épaisseur physique de chaque couche dans le dispositif et un espacement dans un motif de surface, fournissant ainsi une large plage de réglage de fréquence. Pour des applications à large bande passante, en particulier pour un filtre à bande ultra-large constitué de filtres LC, la large plage de fréquences garantit qu'une amélioration de l'atténuation est effectuée sur deux côtés en utilisant uniquement une seule puce.
PCT/CN2020/074878 2019-02-19 2020-02-12 Filtre passe-bande et duplexeur WO2020168958A1 (fr)

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CN201910123846.7 2019-02-19
CN201910123846.7A CN110071702B (zh) 2019-02-19 2019-02-19 一种带通滤波器及双工器

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Publication number Priority date Publication date Assignee Title
CN110071702B (zh) * 2019-02-19 2023-04-07 天津大学 一种带通滤波器及双工器
CN110661508A (zh) * 2019-09-17 2020-01-07 天津大学 一种双工器、多工器、高频前端电路以及通信装置
CN111130499B (zh) * 2020-01-06 2023-05-02 中国电子科技集团公司第十三研究所 一种宽带薄膜腔声谐振滤波器
CN111371407B (zh) * 2020-03-18 2021-02-26 诺思(天津)微系统有限责任公司 调整谐振频率的方法和滤波器、多工器、通信设备
CN111969978B (zh) * 2020-08-31 2022-03-15 诺思(天津)微系统有限责任公司 滤波器设计方法和滤波器、多工器、通信设备
CN116527009B (zh) * 2023-06-20 2023-12-05 华南理工大学 电学器件与声学器件混合的滤波器及射频前端

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