High-bandwidth and near-field suppression filters, integrated modules, and electronic devices.

Abstract

The present invention provides a high-bandwidth and high-neighbor suppression filter, an integrated module, and electronic equipment, the high-bandwidth and high-neighbor suppression filter comprising at least one acoustic resonator and an LC filtering unit, the LC filtering unit comprising a capacitor and an inductor, the acoustic resonator, the capacitor and the inductor connected in series and / or parallel, and the filter arranged to form at least one transmission zero. The acoustic resonator achieves high-neighbor suppression, the capacitor and inductor in the LC filtering unit cooperate with the acoustic resonator to improve the bandwidth of the filter, and the degree of suppression is improved by forming at least one transmission zero based on the interaction of the capacitor, inductor and acoustic resonator, further realizing a high-bandwidth and high-neighbor suppression filter.

Description

Technical Field

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[0001] The present invention relates to the technical field of semiconductor devices, and more specifically, to a filter with a large bandwidth and near-band high suppression, an integrated module, and an electronic device.

[0002] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on July 26, 2023, with an application number of 202310937858.X and an invention title of "Filter, Integrated Module, and Electronic Device with Large Bandwidth and Near-Band High Suppression", and all of its contents are incorporated herein by reference. [[ID=^{}10]]

Background Art

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

[0004] As for LC filters, there are LTCC (Low Temperature Co-fired Ceramic) LC filters and IPD (Integrated Passive Devices) LC filters. The LC filter represented by LTCC is used in the manufacture of broadband filters, but it is limited by the Q value of the device, and it is difficult to improve the near-band suppression performance of the LC filter. Surface acoustic wave filters and bulk acoustic wave filters can manufacture narrow-band and near-band high suppression filters, but it is difficult to improve their bandwidth.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Based on current fifth-generation mobile communications and subsequent sixth-generation mobile communications, the bandwidth of the frequency bands is wide and the distance between frequency bands is short. Therefore, how to provide filters with high bandwidth and high near-field suppression is a technical problem that those skilled in the art will try to solve.

[0006] In view of this, the present invention provides a filter, integrated module, and electronic device with high bandwidth and high near-field suppression to solve the above problems, and the technical proposal is as follows. [Means for solving the problem]

[0007] A filter with high bandwidth and high near-field suppression, wherein the filter includes at least one acoustic resonator and an LC filtering unit, and the LC filtering unit includes a capacitor and an inductor. The acoustic resonator, the capacitor, and the inductor are connected in series and / or parallel, and the filter is arranged to form at least one transmission zero.

[0008] Preferably, in the above-described high-bandwidth and high-neighbor suppression filter, the at least one acoustic resonator includes a first acoustic resonator, and the LC filtering unit includes a first inductor, a second inductor and a π-type capacitor network. The first end of the first inductor is connected to the first end of the π-type capacitor network, and this connection node is 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-type capacitor network, and this connection node is the second end of the filter. The third end of the Π-type capacitor network is grounded via the second inductor.

[0009] Preferably, in the above-mentioned high-bandwidth and high-neighbor suppression filter, the Π-type capacitor network includes a first capacitor, a second capacitor, and a third capacitor. The first end of the first capacitor is connected to the first end of the second capacitor, and this connection node is the first end of the π-type capacitor network. The second terminal of the second capacitor is connected to the first terminal of the third capacitor, and this connection node is the second terminal of the π-type capacitor network. The second terminal of the first capacitor is connected to the second terminal of the third capacitor, and this connection node becomes the third terminal of the π-type capacitor network.

[0010] Preferably, in the above-described high-bandwidth and high-neighbor suppression filter, the at least one acoustic resonator further includes a second acoustic resonator, and the LC filtering unit further includes a third inductor, a fourth inductor, and a fourth capacitor. The first end of the second acoustic resonator is set 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 its connection node is connected to the first end of the first inductor. The second terminal of the fourth capacitor is connected to the first terminal of the fourth inductor. The second end of the fourth inductor is grounded.

[0011] This application further provides an integrated module comprising a high-bandwidth and high-neighbor suppression filter as described in any one of the above paragraphs.

[0012] This application further provides an electronic device which is a high-bandwidth and high-neighbor suppression filter as described in any one of the above paragraphs. Or, Includes the integrated module described above. [Effects of the Invention]

[0013] Compared to the prior art, the beneficial effects achieved by this invention are as follows: The high-bandwidth, near-field suppression filter provided by the present invention comprises at least one acoustic resonator and an LC filtering unit, the LC filtering unit comprising a capacitor and an inductor, the acoustic resonator, the capacitor and the inductor connected in series and / or parallel, and the filter arranged to form at least one transmission zero. The acoustic resonator achieves near-field suppression, the capacitor and inductor in the LC filtering unit cooperate with the acoustic resonator to improve the bandwidth of the filter, and the suppression is further improved by forming at least one transmission zero based on the interaction of the capacitor, inductor and acoustic resonator, thereby realizing a high-bandwidth, near-field suppression filter. [Brief explanation of the drawing]

[0014] To more clearly explain the embodiments of the present invention or the prior art, the following briefly introduces the drawings necessary for describing the embodiments or the prior art. The drawings described below are merely embodiments of the present invention, and those skilled in the art can obtain other drawings based on the provided drawings without having to perform work commensurate with inventive step.

[0015] [Figure 1] This is a schematic diagram of the circuit principle of a high-bandwidth, near-field suppression filter provided in an embodiment of the present invention. [Figure 2] This 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. [Figure 3] This is a schematic diagram of the simulation results after short-circuiting the first acoustic resonator in the filter circuit structure shown in Figure 1, provided by an embodiment of the present invention. [Figure 4] This 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. [Figure 5] This is a schematic diagram of the circuit principle of another high-bandwidth and near-field suppression filter provided by an embodiment of the present invention. [Figure 6] This is a schematic diagram of the simulation results of the filter circuit structure shown in Figure 5, provided by an embodiment of the present invention.

Best Mode for Carrying Out the Invention

[0016] Hereinafter, by combining the drawings of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described. The described embodiments are not all embodiments of the present invention, but only some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained on the premise that those skilled in the art do not perform labor worthy of inventive step belong to the protection scope of the present invention.

[0017] In order to make the above objects, features, and advantages of the present invention clearer, the present invention will be further described in detail below by combining the drawings and specific embodiments.

[0018] The filter with large bandwidth and near-band high suppression provided by the embodiments of the present application includes at least one acoustic resonator and an LC filtering unit, and the LC filtering unit includes a capacitor and an inductor.

[0019] The acoustic resonator, the capacitor, and the inductor are connected in series and / or in parallel, and the filter is arranged to be able to form at least one transmission zero point.

[0020] Specifically, in the embodiments of the present invention, the acoustic resonator realizes near-band high suppression, and the capacitor and inductor in the LC filtering unit cooperate with the acoustic resonator to improve the bandwidth of the filter, and at least one transmission zero point is formed based on the interaction of the capacitor, inductor, and acoustic resonator to improve the suppression degree, and further, a filter with large bandwidth and near-band high suppression is realized.

[0021] Preferably, in other embodiments of the present invention, referring to FIG. 1, FIG. 1 is a schematic diagram of the circuit principle of a filter with large bandwidth and near-band high suppression provided by the embodiments of the present invention. The at least one acoustic resonator includes a first acoustic resonator S1, and the LC filtering unit includes a first inductor L1, a second inductor L2, and a Π-type capacitor network.

[0022] The first end of the first inductor L1 is connected to the first end of the π-type capacitor network, and this connection node is designated as the first end P1 of the filter.

[0023] The second end of the first inductor L1 is connected to the first end of the first acoustic resonator S1.

[0024] The second end of the first acoustic resonator S1 is connected to the second end of the π-type capacitor network, and this connection node is designated as the second end P2 of the filter.

[0025] The third end of the Π-type capacitor network is grounded via the second inductor L2.

[0026] As shown in Figure 1, the Π-type capacitor network includes a first capacitor C1, a second capacitor C2, and a third capacitor C3.

[0027] The first terminal of the first capacitor C1 is connected to the first terminal of the second capacitor C2, and this connection node is the first terminal of the π-type capacitor network.

[0028] The second terminal of the second capacitor C2 is connected to the first terminal of the third capacitor C3, and this connection node is the second terminal of the π-type capacitor network.

[0029] The second terminal of the first capacitor C1 is connected to the second terminal of the third capacitor C3, and this connection node becomes the third terminal of the π-type capacitor network.

[0030] 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 pi-type capacitor network composed of a first capacitor C1, a second capacitor C2, and a third capacitor C3. The lower part of the pi-type capacitor network is grounded via the second inductor L2, thereby realizing a new type of filter with high bandwidth and high near-field suppression.

[0031] Referring to Figure 2, which is a schematic diagram of the simulation results of the first acoustic resonator in the filter circuit structure of Figure 1 provided by an embodiment of the present invention; referring to Figure 3, which is a schematic diagram of the simulation results after short-circuiting the first acoustic resonator in the filter circuit structure of Figure 1 provided by an embodiment of the present invention; referring to Figure 4, which is a schematic diagram of the simulation results of the filter circuit structure of Figure 1 provided by an embodiment of the present invention; as can be seen from the simulation results of Figures 2 to 4, the filter circuit structure of Figure 1 provided by an embodiment of the present invention can simultaneously satisfy the characteristics of high bandwidth (bandwidth range is 3 GHz to 5 GHz) and high near-field suppression (above 5.15 GHz, 20 suppression).

[0032] Preferably, in other embodiments of the present invention, with reference to Figure 5, which is a schematic diagram of the circuit principle of another high-bandwidth and near-field high-suppression filter provided by embodiments of the present invention, wherein the at least one acoustic resonator further includes a second acoustic resonator S2, and the LC filtering unit further includes a third inductor L3, a fourth inductor L4, and a fourth capacitor C4.

[0033] The first end of the second acoustic resonator S2 is set as the first end P1 of the filter.

[0034] The second end of the second acoustic resonator S2 is connected to the first end of the third inductor L3.

[0035] The second end of the third inductor L3 is connected to the first end of the fourth capacitor C4, and this connection node is connected to the first end of the first inductor L1.

[0036] The second terminal of the fourth capacitor C4 is connected to the first terminal of the fourth inductor L4.

[0037] The second terminal of the fourth inductor L4 is grounded.

[0038] Specifically, in an 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 based on the filter circuit structure of Figure 1 to form another new type of filter with a large bandwidth and high suppression of nearby noise.

[0039] Referring to Figure 6, which is a schematic diagram of the simulation results of the filter circuit configuration of Figure 5 provided by an embodiment of the present invention, the performance of the filter with high bandwidth and high near-field suppression has been further improved.

[0040] Based on the above embodiments of the present invention, other embodiments of the present invention further provide an integrated module which includes a high-bandwidth and high-neighbor suppression filter as described in the above embodiments.

[0041] Based on the above embodiments of the present invention, other embodiments of the present invention further provide an electronic device, the electronic device being a high-bandwidth and high-neighbor suppression filter as described in the above embodiments, Or, Includes the integrated module described in the above embodiment.

[0042] The above describes in detail the high-bandwidth and near-field high-suppression filters, integrated modules, and electronic devices provided by the present invention. The principles and embodiments of the present invention are described herein using specific examples. The above description of embodiments is used solely to understand the methods and spirit of the present invention. Furthermore, those skilled in the art will know that specific embodiments and applications can be modified based on the concept of the present invention. Thus, the contents of this specification do not limit the present invention.

[0043] Herein, each embodiment of this specification is described in a progressive manner, with each embodiment primarily describing the differences from the other embodiments, and similar or identical parts between embodiments should be referenced to one another. The descriptions of the apparatus disclosed in the embodiments are brief, corresponding to the methods disclosed in the embodiments, and relevant parts should be referred to in the description of the methods.

[0044] Furthermore, in this specification, relational terms such as "First," "Second," etc., are merely for distinguishing one entity or operation from another, and do not necessarily require or imply that there is an actual relationship or order between these entities or operations. The terms "include," "incorporate," or any other variation are intended to include non-exclusive inclusion, thereby including, or containing, the inherent elements of a set of elements in a process, method, article, or apparatus. Unless otherwise specified, the elements limited by the phrase "include..." do not preclude the inclusion of other identical elements in a process, method, article, or apparatus that includes such elements.

[0045] Those skilled in the art can implement or use the present invention based on the above description of the disclosed embodiments. Several modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the invention. Accordingly, the present invention is not limited to these embodiments shown herein and applies to the broadest scope that is consistent with the principles and novel features disclosed herein.

Claims

1. A filter with high bandwidth and high near-field suppression, wherein the filter includes at least one acoustic resonator and an LC filtering unit, and the LC filtering unit includes a capacitor and an inductor. The filter is characterized in that the acoustic resonator, the capacitor, and the inductor are connected in series and / or parallel, and the filter is arranged to form at least one transmission zero.

2. The at least one acoustic resonator includes a first acoustic resonator, and the LC filtering unit includes a first inductor, a second inductor, and a π-type capacitor network. The first end of the first inductor is connected to the first end of the π-type capacitor network, and this connection node is 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-type capacitor network, and this connection node is the second end of the filter. The filter according to claim 1, characterized in that the third end of the Π-type capacitor network is grounded via the second inductor.

3. The aforementioned Π-type capacitor network includes a first capacitor, a second capacitor, and a third capacitor. The first end of the first capacitor is connected to the first end of the second capacitor, and this connection node is the first end of the π-type capacitor network. The second terminal of the second capacitor is connected to the first terminal of the third capacitor, and this connection node is the second terminal of the π-type capacitor network. The filter according to claim 2, characterized in that the second terminal of the first capacitor is connected to the second terminal of the third capacitor, and the connection node is the third terminal of the π-type capacitor network.

4. The at least one acoustic resonator further includes a second acoustic resonator, and the LC filtering unit further includes a third inductor, a fourth inductor, and a fourth capacitor. The first end of the second acoustic resonator is set 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 its connection node is connected to the first end of the first inductor. The second terminal of the fourth capacitor is connected to the first terminal of the fourth inductor. The filter according to any one of claims 2 to 3, characterized in that the second end of the fourth inductor is grounded.

5. An integrated module, wherein the integrated module includes a filter according to any one of claims 1 to 4.

6. An electronic device wherein the electronic device is a filter according to any one of claims 1 to 4. Or, An electronic device characterized by including the integrated module described in claim 5.

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