Large-bandwidth and near-end high-suppression filter, integrated module, and electronic device

Abstract

The present invention provides a large-bandwidth and near-end high-suppression filter, an integrated module, and an electronic device. The large-bandwidth and near-end high-suppression filter comprises at least one acoustic resonator and an LC filtering assembly; the LC filtering assembly comprises a capacitor and an inductor; the acoustic resonator, the capacitor, and the inductor are connected in series and / or in parallel; and the filter is configured to be capable of forming at least one transmission zero point. The acoustic resonator is used for realizing near-end high-suppression, and the capacitor and the inductor in the LC filtering assembly are used for matching the acoustic resonator so as to improve the bandwidth of the filter; and at least one transmission zero point can be formed on the basis of the interactions of the capacitor, the inductor, and the acoustic resonator so as to improve the suppression degree, so that a large-bandwidth and near-end high-suppression filter is realized.

Description

Filters, integrated modules, and electronic devices with wide bandwidth and high near-end suppression

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 26, 2023, with application number 202310937858.X and invention name “Filter, integrated module and electronic device with large bandwidth and high proximal suppression”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of semiconductor devices, and more particularly to a filter with large bandwidth and high near-end suppression, an integrated module and an electronic device. Background Art

[0003] Traditional RF communication filters include LC filters, SAW (Surface Acoustic Wave) surface acoustic wave filters, BAW (Bulk Acoustic Wave) bulk acoustic wave filters, and FBAR (Film Bulk Acoustic Resonator) bulk acoustic wave filters.

[0004] Among them, LC filters include LTCC (Low Temperature Co-fired Ceramic) LC filters and IPD (Integrated Passive Devices) LC filters. LC filters represented by LTCC can be used to make broadband filters, but due to the limitation of the device Q value, the near-end suppression performance of LC filters is difficult to improve. Although surface acoustic wave filters and bulk acoustic wave filters can be used to make narrowband filters with high near-end suppression, their bandwidth is difficult to improve.

[0005] Based on the current 5G communication and the subsequent 6G communication, the frequency band bandwidth is very wide and the frequency band distance is very close. Therefore, how to provide a filter with large bandwidth and high near-end suppression is a technical problem that needs to be solved urgently by those skilled in the art.

[0006] Summary of the Invention

[0007] In view of this, in order to solve the above problems, the present invention provides a filter, an integrated module and an electronic device with large bandwidth and high near-end suppression. The technical solutions are as follows:

[0008] A filter with large bandwidth and high proximal suppression, the filter comprising: at least one acoustic resonator and an LC filter component, the LC filter component comprising a capacitor and an inductor;

[0009] The acoustic resonator, the capacitor, and the inductor are connected in series and / or in parallel, and the filter is configured to form at least one transmission zero.

[0010] Preferably, in the above-mentioned filter with large bandwidth and high proximal suppression, the at least one acoustic resonator includes: a first acoustic resonator, and the LC filter component includes: a first inductor, a second inductor and a π-shaped capacitor network;

[0011] Wherein, the first end of the first inductor is connected to the first end of the π-shaped capacitor network, and the connection node serves as the first end of the filter;

[0012] The second end of the first inductor is connected to the first end of the first acoustic resonator;

[0013] The second end of the first acoustic resonator is connected to the second end of the π-shaped capacitor network, and the connection node serves as the second end of the filter;

[0014] The third end of the π-shaped capacitor network is grounded through the second inductor.

[0015] Preferably, in the above-mentioned filter with large bandwidth and proximal high suppression, the π-shaped capacitor network includes: a first capacitor, a second capacitor and a third capacitor;

[0016] The first end of the first capacitor is connected to the first end of the second capacitor, and the connection node serves as the first end of the π-shaped capacitor network;

[0017] The second end of the second capacitor is connected to the first end of the third capacitor, and the connection node serves as the second end of the π-shaped capacitor network;

[0018] The second end of the first capacitor is connected to the second end of the third capacitor, and the connection node serves as the third end of the π-shaped capacitor network.

[0019] Preferably, in the above-mentioned filter with large bandwidth and high proximal suppression, the at least one acoustic resonator further comprises: a second acoustic resonator, and the LC filter component further comprises: a third inductor, a fourth inductor and a fourth capacitor;

[0020] wherein the first end of the second acoustic resonator serves as the first end of the filter;

[0021] The second end of the second acoustic resonator is connected to the first end of the third inductor;

[0022] The second end of the third inductor is connected to the first end of the fourth capacitor, and a connection node is connected to the first end of the first inductor;

[0023] The second end of the fourth capacitor is connected to the first end of the fourth inductor;

[0024] A second terminal of the fourth inductor is grounded.

[0025] The present application also provides an integrated module, which includes the filter with large bandwidth and high proximal suppression as described in any one of the above items.

[0026] The present application also provides an electronic device, comprising any one of the above-mentioned filters with large bandwidth and high proximal suppression;

[0027] or,

[0028] The electronic device includes the integrated module described above.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a filter with wide bandwidth and high near-end suppression, comprising: at least one acoustic resonator and an LC filter assembly, wherein the LC filter assembly includes a capacitor and an inductor; wherein the acoustic resonator, the capacitor, and the inductor are connected in series and / or in parallel, and the filter is configured to form at least one transmission zero. The acoustic resonator is used to achieve high near-end suppression, and the capacitor and inductor in the LC filter assembly are used to match the acoustic resonator to increase the bandwidth of the filter. Furthermore, the interaction between the capacitor, inductor, and acoustic resonator can form at least one transmission zero to improve suppression, thereby realizing a filter with wide bandwidth and high near-end suppression. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0032] FIG1 is a schematic diagram of a circuit principle of a filter with large bandwidth and high near-end suppression provided by an embodiment of the present invention;

[0033] FIG2 is a schematic diagram of simulation results of a first acoustic resonator in the filter circuit structure shown in FIG1 according to an embodiment of the present invention;

[0034] FIG3 is a schematic diagram of simulation results after the first acoustic resonator in the filter circuit structure shown in FIG1 is short-circuited, provided by an embodiment of the present invention;

[0035] FIG4 is a schematic diagram of simulation results based on the filter circuit structure shown in FIG1 according to an embodiment of the present invention;

[0036] FIG5 is a schematic diagram of the circuit principle of another filter with large bandwidth and high near-end suppression provided by an embodiment of the present invention;

[0037] FIG6 is a schematic diagram of simulation results based on the filter circuit structure shown in FIG5 , provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] The filter with large bandwidth and high proximal suppression provided by the embodiment of the present application includes: at least one acoustic resonator and an LC filter component, and the LC filter component includes a capacitor and an inductor.

[0041] The acoustic resonator, the capacitor, and the inductor are connected in series and / or in parallel, and the filter is configured to form at least one transmission zero.

[0042] Specifically, in an embodiment of the present invention, an acoustic resonator is used to achieve high near-end suppression, and the capacitor and inductor in the LC filter component are used to match the acoustic resonator to increase the bandwidth of the filter. Based on the interaction between the capacitor, inductor and acoustic resonator, at least one transmission zero point can be formed to improve the suppression degree, thereby realizing a filter with large bandwidth and high near-end suppression.

[0043] Optionally, in another embodiment of the present invention, referring to Figure 1, Figure 1 is a schematic diagram of the circuit principle of a filter with large bandwidth and high proximal suppression provided by an embodiment of the present invention, wherein the at least one acoustic resonator includes: a first acoustic resonator S1, and the LC filter component includes: a first inductor L1, a second inductor L2 and a π-shaped capacitor network.

[0044] The first end of the first inductor L1 is connected to the first end of the π-shaped capacitor network, and the connection node serves as the first end P1 of the filter.

[0045] The second end of the first inductor L1 is connected to the first end of the first acoustic resonator S1.

[0046] The second end of the first acoustic resonator S1 is connected to the second end of the π-shaped capacitor network, and the connection node serves as the second end P2 of the filter.

[0047] The third end of the π-shaped capacitor network is grounded through the second inductor L2.

[0048] As shown in FIG1 , the π-shaped capacitor network includes: a first capacitor C1, a second capacitor C2 and a third capacitor C3.

[0049] The first end of the first capacitor C1 is connected to the first end of the second capacitor C2, and the connection node serves as the first end of the π-shaped capacitor network.

[0050] The second end of the second capacitor C2 is connected to the first end of the third capacitor C3, and the connection node serves as the second end of the π-shaped capacitor network.

[0051] The second end of the first capacitor C1 is connected to the second end of the third capacitor C3, and the connection node serves as the third end of the π-shaped capacitor network.

[0052] Specifically, in an embodiment of the present invention, the first inductor L1 is connected in series with the first acoustic resonator S1 as a series inductor, and then connected in parallel with a π-shaped capacitor network consisting of a first capacitor C1, a second capacitor C2 and a third capacitor C3. The bottom of the π-shaped capacitor network is grounded through the second inductor L2, realizing a new type of filter with large bandwidth and high proximal suppression.

[0053] Refer to Figure 2, which is a schematic diagram of the simulation results of the first acoustic resonator in the filter circuit structure shown in Figure 1 provided by an embodiment of the present invention. Refer to Figure 3, which is a schematic diagram of the simulation results of the first acoustic resonator in the filter circuit structure shown in Figure 1 after short-circuiting provided by an embodiment of the present invention. Refer to Figure 4, which is a schematic diagram of the simulation results of the filter circuit structure shown in Figure 1 provided by an embodiment of the present invention. Based on the simulation results shown in Figures 2 to 4, it can be seen that the filter circuit structure based on Figure 1 provided by an embodiment of the present invention can simultaneously meet the characteristics of high bandwidth (bandwidth range is 3GHz-5GHz) and proximal high suppression (greater than 5.15GHz, suppression 20).

[0054] Optionally, in another embodiment of the present invention, referring to Figure 5, Figure 5 is a schematic diagram of the circuit principle of another large-bandwidth and proximal high-suppression filter provided in an embodiment of the present invention, the at least one acoustic resonator also includes: a second acoustic resonator S2, and the LC filter component also includes: a third inductor L3, a fourth inductor L4 and a fourth capacitor C4.

[0055] The first end of the second acoustic resonator S2 serves as the first end P1 of the filter.

[0056] The second end of the second acoustic resonator S2 is connected to the first end of the third inductor L3.

[0057] The second end of the third inductor L3 is connected to the first end of the fourth capacitor C4 , and a connection node is connected to the first end of the first inductor L1 .

[0058] The second end of the fourth capacitor C4 is connected to the first end of the fourth inductor L4.

[0059] A second end of the fourth inductor L4 is grounded.

[0060] Specifically, in the embodiment of the present invention, a second acoustic resonator S2, a third inductor L3, a fourth inductor L4 and a fourth capacitor C4 are added to the filter circuit structure shown in FIG1 to form another new type of filter with large bandwidth and high proximal suppression.

[0061] 6 , which is a schematic diagram of simulation results based on the filter circuit structure shown in FIG. 5 provided by an embodiment of the present invention, it can be clearly seen that the performance of the filter with large bandwidth and high proximal suppression is further improved.

[0062] Based on the above embodiments of the present invention, another embodiment of the present invention further provides an integrated module, which includes the filter with large bandwidth and high proximal suppression described in the above embodiments.

[0063] Based on the above embodiments of the present invention, another embodiment of the present invention provides an electronic device, which includes the filter with large bandwidth and high proximal suppression as described in the above embodiments.

[0064] or,

[0065] The electronic device includes the integrated module described in the above embodiment.

[0066] The above is a detailed introduction to a filter, integrated module and electronic device with large bandwidth and high proximal suppression provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

[0067] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similarities between the various embodiments can be referred to in conjunction with each other. The apparatuses disclosed in the embodiments correspond to the methods disclosed in the embodiments, so their descriptions are relatively simple. For relevant details, refer to the method descriptions.

[0068] It should also be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that the process, method, article, or apparatus comprising a series of elements inherent to the elements, or also including elements inherent to these processes, methods, articles, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0069] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A filter with large bandwidth and high near-end suppression, characterized in that: The filter comprises: at least one acoustic resonator and an LC filter component, wherein the LC filter component comprises a capacitor and an inductor; The acoustic resonator, the capacitor and the inductor are connected in series and / or in parallel, and the filter is configured to form at least one transmission zero point.

2. The filter according to claim 1, characterized in that The at least one acoustic resonator comprises: a first acoustic resonator, the LC filter component comprises: a first inductor, a second inductor and a π-shaped capacitor network; Wherein, the first end of the first inductor is connected to the first end of the Π-shaped capacitor network, and the connection node serves as the first end of the filter; The second end of the first inductor is connected to the first end of the first acoustic resonator; The second end of the first acoustic resonator is connected to the second end of the π-shaped capacitor network, and the connection node serves as the second end of the filter; The third end of the Π-shaped capacitor network is grounded through the second inductor.

3. The filter according to claim 2, characterized in that The Π-shaped capacitor network includes: a first capacitor, a second capacitor and a third capacitor; Wherein, the first end of the first capacitor is connected to the first end of the second capacitor, and the connection node serves as the first end of the Π-shaped capacitor network; The second end of the second capacitor is connected to the first end of the third capacitor, and the connection node serves as the second end of the Π-shaped capacitor network; The second end of the first capacitor is connected to the second end of the third capacitor, and the connection node serves as the third end of the Π-shaped capacitor network.

4. The filter according to any one of claims 2 to 3, characterized in that: The at least one acoustic resonator further comprises: a second acoustic resonator, and the LC filter component further comprises: a third inductor, a fourth inductor and a fourth capacitor; Wherein, the first end of the second acoustic resonator serves as the first end of the filter; The second end of the second acoustic resonator is connected to the first end of the third inductor; The second end of the third inductor is connected to the first end of the fourth capacitor, and the connection node is connected to the first end of the first inductor; The second end of the fourth capacitor is connected to the first end of the fourth inductor; A second terminal of the fourth inductor is grounded.

5. An integrated module, characterized in that: The integrated module comprises the filter according to any one of claims 1-4.

6. An electronic device, characterized in that: The electronic device comprises the filter according to any one of claims 1 to 4; or, The electronic device comprises the integrated module according to claim 5.

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