Resonators, filters and multiplexers

Abstract

The application discloses a resonator, filter and multiplexer. The resonator comprises at least one LC resonant unit and at least one embedded resonant unit; the at least one LC resonant unit comprises at least one resonant element, the at least one resonant element comprises a first part, a second part and an interface between the two, and the interface connects the first part and the second part; the embedded resonant unit is embeddedly connected with the LC resonant unit through the interface. The application not only enables the LC resonant unit and the embedded unit to simultaneously filter the input signal, thereby ensuring the filtering performance of the resonator, but also enables the elements in the embedded resonant unit and the elements in the LC resonant unit to form a new resonant unit, and the input signal is filtered through the new filter unit, thereby not only improving the filtering effect of the resonator, but also increasing the signal transmission zero point of the filter, and further improving the filtering performance of the filter.

Description

Technical Field

[0001] The present invention relates to the field of signal processing technology, and more particularly to a resonator, filter and multiplexer. Background Technology

[0002] Filters are widely used in integrated circuits. Traditional integrated circuit filters suffer from the following problems: limited space for filter placement within the circuit limits performance improvement. Resonators are the fundamental unit in filter design; a filter can include multiple resonators. Typically, resonators are two-port devices. For example, Figure 1 A circuit diagram of a resonator provided for the prior art, such as Figure 1 As shown, the resonator includes a first inductor L1 and a first capacitor C1, which are connected in series to form the resonator. Figure 2 A circuit diagram of another resonator provided for the prior art, such as Figure 2 As shown, the resonator includes a first inductor L1 and a first capacitor C1, which are connected in parallel to form the resonator. Figure 3 A circuit diagram of another resonator provided for the prior art, such as Figure 3 As shown, the resonator includes a first inductor L1, a first capacitor C1, and a second capacitor C2. The first inductor L1 and the first capacitor C1 are connected in parallel, and then connected in series with the second capacitor C2 to form a resonator. Figures 1 to 3 This is just one example of a resonator. In other resonators, additional inductors or capacitors can be added to the first inductor L1 and the first capacitor C1 to form a resonator.

[0003] When a filter includes multiple resonators, the resonators can be connected in series and in parallel. Figure 4 A circuit diagram of a filter provided by existing technology. For example... Figure 4 As shown, the filter may include a first resonator A and a second resonator B. The first resonator A is connected in series between the first terminal IN and the second terminal OUT of the filter, and the second resonator B is connected in parallel to the second terminal OUT of the filter. Therefore, the resonators can be connected in series or in parallel within the filter. In this case, the connection method of the resonators within the filter is relatively fixed, and the filtering performance of the first resonator A and the second resonator B directly affects the filtering performance of the filter. At the same time, when different resonators are connected in series or in parallel within the filter, the resonators and the connection structure between the resonators occupy a large space, which is not conducive to the integration of the filter. Summary of the Invention

[0004] This invention provides a resonator, a filter, and a multiplexer to improve the filtering effect of the resonator while saving space occupied by the resonator.

[0005] In a first aspect, an embodiment of the present application provides a resonator, comprising at least one LC resonant unit and at least one embedded resonant unit.

[0006] The at least one LC resonant unit comprises at least one resonant element, the at least one resonant element comprises a first part, a second part and an interface between the first part and the second part, and the interface connects the first part and the second part; and the embedded resonant unit is embeddedly connected with the LC resonant unit through the interface.

[0007] Optionally, the resonant element is an inductive element, the interface is arranged at a middle of the inductive element, and the inductive element is divided into the first part and the second part through the interface.

[0008] Optionally, the resonant element comprises at least a first capacitive element and a second capacitive element, the first capacitive element and the second capacitive element are connected in series, the interface is formed at a series connection point, the first capacitive element serves as the first part, and the second capacitive element serves as the second part.

[0009] Optionally, the interface comprises a first interface and a second interface, and the embedded resonant unit is connected in series between the first interface and the second interface.

[0010] Optionally, a first end of the embedded resonant unit is connected with the interface, and a second end of the embedded resonant unit is connected with a reference potential end.

[0011] Optionally, the LC resonant unit and the resonant element in the embedded resonant unit are the same or different.

[0012] Optionally, the embedded resonant unit comprises at least an inductive element and / or a capacitive element; or the embedded resonant unit comprises at least one of a surface acoustic wave resonator and a thin film acoustic resonator.

[0013] In a second aspect, an embodiment of the present application further provides a filter, comprising the resonator of the first aspect.

[0014] In a third aspect, an embodiment of the present application further provides a multiplexer, comprising the filter of the second aspect.

[0015] The technical scheme of the embodiment of the present application sets the interface on the resonant element in the LC resonant unit, so that the embedded resonant unit is embeddedly connected with the LC resonant unit through the interface, which can not only make the LC resonant unit and the embedded unit filter the input signal at the same time, and ensure the filtering performance of the resonator, but also make the elements in the embedded resonant unit and the elements in the LC resonant unit form a new resonant unit, and filter the input signal through the new filter unit, which can not only improve the filtering effect of the resonator, but also increase the signal transmission zero point of the filter, and further improve the filtering performance of the filter. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A circuit schematic diagram of a resonator provided by the prior art;

[0017] Figure 2 Another circuit schematic diagram of a resonator provided by the prior art;

[0018] Figure 3 Another circuit schematic diagram of a resonator provided by the prior art;

[0019] Figure 4 A circuit schematic diagram of a filter provided by the prior art;

[0020] Figure 5 A circuit schematic diagram of a resonator provided by the embodiment of the present application;

[0021] Figure 6 Another circuit schematic diagram of a resonator provided by the embodiment of the present application;

[0022] Figure 7 Another circuit schematic diagram of a resonator provided by the prior art;

[0023] Figure 8 Another circuit schematic diagram of a resonator provided by the embodiment of the present application;

[0024] Figure 9 A Figure 7 resonator provided by the prior art and Figure 8 a comparison schematic diagram of the filtering performance of the resonator provided by the prior art;

[0025] Figure 10 Another circuit schematic diagram of a resonator provided by the embodiment of the present application;

[0026] Figure 11 Another circuit schematic diagram of a resonator provided by the embodiment of the present application;

[0027] Figure 12 A structure schematic diagram of a multiplexer provided by the embodiment of the present application. DETAILED DESCRIPTION

[0028] The application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely illustrative of the application and not in limitation thereof. It should also be noted that, for the purpose of clarity, only those structures related to the application are shown in the drawings.

[0029] Figure 5 A circuit schematic diagram of a resonator is provided for an embodiment of the application. As shown, the resonator comprises at least one LC resonant unit 110 and at least one embedded resonant unit 120; the at least one LC resonant unit 110 comprises at least one resonant element 111, the at least one resonant element 111 comprises a first part 111A, a second part 111B and an interface D between the two, the interface D connects the first part 111A and the second part 111B; the embedded resonant unit 120 is embeddedly connected with the LC resonant unit 110 through the interface D. Figure 5 Specifically,

[0030] The resonator is exemplarily shown to comprise one LC resonant unit 110 and one embedded resonant unit 120. The LC resonant unit 110 is composed of an inductive element and a capacitive element. Exemplarily, the LC resonant unit 110 is composed of one inductive element and one capacitive element in parallel. The resonant element 111 can be an inductive element or a capacitive element connected in series. The resonant element 111 can be divided into the first part 111A and the second part 111B through the interface D, and the first part 111A and the second part 111B are connected through the interface D, so that the resonant element 111 is an entirety. When the resonant element 111 has the interface D, the embedded resonant unit 120 can be connected with the interface D, so that the embedded resonant unit 120 can be embeddedly connected with the LC resonant unit 110 through the interface D, at this time, the LC resonant unit 110 and the embedded resonant unit 120 not only simultaneously serve as a part of the resonator to filter the input signal, but also ensure the filtering performance of the resonator. Moreover, the embedded resonant unit 120 is embeddedly connected with the LC resonant unit 110 through the interface D, which can make the elements in the embedded resonant unit 120 and the elements in the LC resonant unit 110 form a new resonant unit, and filter the input signal through the new filter unit, which not only can improve the filtering effect of the resonator, but also can increase the signal transmission zero point of the filter, and further improve the filtering performance of the filter. Figure 5 It should be noted that,

[0031] Figure 5 ​Only an example of the resonator. In other embodiments, the LC resonant unit 110 can also be composed of one inductive element and one capacitive element in series. The resonator can also include multiple LC resonant units 110 and / or multiple embedded resonant units 120, the multiple LC resonant units 110 can be connected in series and / or in parallel, the embedded resonant units 120 can be embedded into different LC resonant units 110, or different embedded resonant units 120 can be connected to each other and then embedded into the LC resonant unit 110. In addition, the number and connection relationship of the inductive element and the capacitive element in each LC resonant unit 110 can be the same or different, and the number and connection relationship of the resonant elements in each embedded resonant unit 120 can be the same or different.

[0032] The technical scheme of the embodiment, by setting the interface on the resonant element in the LC resonant unit, makes the embedded resonant unit embeddedly connected with the LC resonant unit through the interface, not only can make the LC resonant unit and the embedded unit filter the input signal at the same time, ensure the filtering performance of the resonator. Moreover, the elements in the embedded resonant unit and the elements in the LC resonant unit can form a new resonant unit, and filter the input signal through the new filter unit, not only can improve the filtering effect of the resonator, but also can increase the signal transmission zero point of the filter, further improve the filtering performance of the filter.

[0033] Exemplarily, Figure 6 Another circuit schematic diagram of a resonator provided by the embodiment of the present application is provided. As shown in Figure 6 The resonant element 111 is an inductive element, and the interface D is arranged at the middle of the inductive element, and the inductive element is divided into the first part 111A and the second part 111B through the interface D.

[0034] Specifically, the resonant element 111 can be an inductive element. By arranging the interface D at the middle of the inductive element, the inductive element can be divided into the first part 111A and the second part 111B, and then the embedded resonant unit 120 is connected at the interface D, so that the embedded resonant unit 120 is embeddedly connected with the LC resonant unit 110 through the interface D on the inductive element, so that the elements in the embedded resonant unit 120 and the elements in the LC resonant unit 110 can form a new resonant unit, and filter the input signal through the new filter unit, not only can improve the filtering effect of the resonator, but also can increase the signal transmission zero point of the filter, further improve the filtering performance of the filter. At the same time, the first part 111A and the second part 111B of the inductive element are connected through the interface D, so that the overall inductance value of the inductive element is unchanged, ensuring the performance of the resonator, which is conducive to the design of the resonator.

[0035] The inductive element can be an inductor. The inductor is connected in parallel with the capacitive element in the LC resonant unit 110. Then, when designing the LC resonant unit 110, an inductor can be designed, and an interface D is formed in the middle of the inductor for embeddedly connecting the embedded resonant unit 120, so that the overall space occupied by the inductor and the embedded resonant unit 120 can be reduced, and the space occupied by the resonator can be saved. When the inductor is formed, when the inductor is a three-dimensional inductor structure, the inductor includes at least two conductive layers, and each conductive layer is electrically connected to form the inductor. At this time, the interface D can be arranged at the connection position of different conductive layers. When the inductor is a two-dimensional inductor structure, the inductor can include a plurality of coils, and the interface D can be arranged at the connection position of different coils.

[0036] When the interface D is arranged in the middle of the inductive element, the embedded resonant unit 120 can be connected to the LC resonant unit 110 in series or in parallel.

[0037] With reference to the foregoing Figure 6 , Figure 6 The interface D includes a first interface D1 and a second interface D2, and the embedded resonant unit 120 is connected in series between the first interface D1 and the second interface D2.

[0038] Specifically, the embedded resonant unit 120 can be connected to the LC resonant unit 110 in series. At this time, the first interface D1 and the second interface D2 are respectively connected to two ends of the embedded resonant unit 120, the first portion 111A and the second portion 111B are connected through the embedded resonant unit 120, and the overall inductive value of the first portion 111A and the second portion 111B is the inductive value of the first portion 111A and the inductive value of the second portion 111B. After that, the overall inductive value of the first portion 111A and the second portion 111B is unchanged, and the embedded resonant unit 120 is embeddedly connected, so that the elements in the embedded resonant unit 120 and the elements in the LC resonant unit 110 form a new resonant unit, and the input signal is filtered through the new filter unit. Not only can the filtering effect of the resonator be improved, but also the signal transmission zero point of the filter can be increased, and the filtering performance of the filter is further improved.

[0039] For example, Figure 7 Another circuit schematic diagram of a resonator provided by the prior art, Figure 8 Another circuit schematic diagram of a resonator provided by the embodiment of the present application, Figure 9 For Figure 7 The resonator provided by the prior art and Figure 8A comparison diagram of filter performance of the resonator is provided. In the diagram, the horizontal axis represents frequency, and the vertical axis represents insertion loss. Curve 1 represents the performance curve of a resonator provided by the prior art, and curve 2 represents the performance curve of a resonator provided by an embodiment of the present application. As shown in Figures 7 to 9 LC resonant unit 110 in the resonator includes A inductor LA and A capacitor CA in parallel, embedded resonant unit 120 includes B capacitor CB, C capacitor CC, D capacitor CD, E capacitor CE and B inductor LB, B capacitor CB and C capacitor CC are connected in series between the first end and the second end of embedded resonant unit 120, D capacitor CD is connected in parallel with B capacitor CB and C capacitor CC, one end of E capacitor CE is connected with the series connection point of B capacitor CB and C capacitor CC, the other end of E capacitor CE is connected with one end of B inductor LB, the other end of B inductor LB is connected with a reference potential end, Figure 7 and Figure 8 The reference potential end is shown as reference ground GND in an exemplary manner in Figure 7 LC resonant unit 110 and embedded resonant unit 120 are connected in series in the prior art. In the present embodiment, as shown in Figure 8 A first interface D1 and a second interface D2 are arranged on A inductor LA of LC resonant unit 110, and embedded resonant unit 120 is connected in series between the first interface D1 and the second interface D2. As can be seen from curve 1 and curve 2, on the side greater than the passband frequency range, the roll-off slope of curve 2 is greater than the roll-off slope of curve 1, i.e., the steepness of curve 2 is greater than the steepness of curve 1, so that the filter effect of the resonator provided by the present embodiment is better than the filter effect of the resonator provided by the prior art. Moreover, curve 2 additionally increases the transmission zero point with respect to curve 1, further improving the filter effect of the resonator provided by the present embodiment. Therefore, by arranging embedded resonant unit 120 to be embeddedly connected with LC resonant unit 110 through interface D, the filter effect of the resonator can be improved, and the signal transmission zero point of the filter can be increased on the basis of the resonator provided by the prior art, further improving the filter performance of the filter.

[0040] Figure 10 A circuit diagram of another resonator provided by an embodiment of the present application is shown in Figure 10 The first end of embedded resonant unit 120 is connected with interface D, and the second end of embedded resonant unit 120 is connected with reference potential end V1.

[0041] Specifically, the embedded resonant unit 120 can also be connected in parallel to the resonator. That is, the first end of the embedded resonant unit 120 is connected to the interface D, and the second end of the embedded resonant unit 120 is connected to the reference potential end V1. At this time, the first part 111A and the second part 111B are connected through the interface D, and the overall inductive value of the first part 111A and the second part 111B remains unchanged, and the embedded resonant unit 120 is embedded through the embedded connection, so that the elements in the embedded resonant unit 120 and the elements in the LC resonant unit 110 form a new resonant unit, and the input signal is filtered through the new filter unit. Not only can improve the filtering effect of the resonator, but also can increase the signal transmission zero point of the filter, and further improve the filtering performance of the filter. Exemplarily, the reference potential end V1 can be a reference ground, and can also be an input end of other reference potentials.

[0042] It should be noted that the embedded resonant unit 120 can also be connected to other circuits or elements through the reference potential end V1 to increase the filtering performance of the resonator. Exemplarily, the second end of the embedded resonant unit 120 can be connected to other resonators to form a filter to improve the filtering performance of the filter.

[0043] Figure 11 Another circuit schematic diagram of a resonator provided by an embodiment of the present application is shown in Figure 11 The resonant element 111 at least includes a first capacitive element C11 and a second capacitive element C12, the first capacitive element C11 and the second capacitive element C12 are connected in series, and an interface D is formed at the series connection point, the first capacitive element C11 is as the first part 111A, and the second capacitive element C12 is as the second part 111B.

[0044] Specifically, as shown in Figure 11As shown, when the resonant element 111 is a capacitive element, the capacitive element can be two capacitive elements connected in series. Then, the interface D is formed at the series connection point of the capacitive elements, so that the embedded resonant unit 120 is embeddedly connected with the LC resonant unit 110 through the interface D between the capacitive elements, so that the elements in the embedded resonant unit 120 and the elements in the LC resonant unit 110 can form a new resonant unit, and the input signal can be filtered through the new filter unit. Not only the filtering effect of the resonator can be improved, but also the signal transmission zero point of the filter can be increased, and the filtering performance of the filter is further improved. At the same time, the interface D is formed at the series connection point of the first capacitive element C11 and the second capacitive element C12, so that the capacitance values of the first capacitive element C11 and the second capacitive element C12 remain unchanged, and the overall capacitance values of the first capacitive element C11 and the second capacitive element C12 remain unchanged, so that the performance of the resonator is guaranteed, and the design of the resonator is facilitated. Exemplarily, the first capacitive element C11 and the second capacitive element C12 can be capacitors.

[0045] When the first capacitive element C11 and the second capacitive element C12 are connected in series, and the interface D is formed at the series connection point, the embedded resonant unit 120 can also be connected with the LC resonant unit 110 in series or in parallel. When the embedded resonant unit 120 is connected with the LC resonant unit 110 in series, the interface D can include a first interface and a second interface, the embedded resonant unit 120 is connected in series between the first interface and the second interface, and the first capacitive element C11 and the second capacitive element C12 are connected through the embedded resonant unit 120. When the embedded resonant unit 120 is connected with the LC resonant unit 110 in parallel, the first end of the embedded resonant unit 120 is connected with the interface D, and the second end of the embedded resonant unit 120 is connected with the reference potential end.

[0046] On the basis of the above technical solutions, the resonant elements in the LC resonant unit and the embedded resonant unit are the same or different.

[0047] Specifically, the resonant elements in the LC resonant unit and the resonant elements in the embedded resonant unit can be set to be the same or different according to the performance requirements of the resonator. When the resonant elements in the LC resonant unit and the resonant elements in the embedded resonant unit are the same, the resonant elements in the embedded resonant unit only include inductive elements and capacitive elements, and the number and connection relationship of the inductive elements and the capacitive elements are the same as those of the inductive elements and the capacitive elements in the LC resonant unit, that is, the LC resonant unit and the embedded resonant unit are completely the same. When the resonant elements in the LC resonant unit and the resonant elements in the embedded resonant unit are different, the embedded resonant unit can include other elements in addition to the inductive elements and the capacitive elements, or the number and / or connection relationship of the inductive elements and the capacitive elements are different from those of the inductive elements and the capacitive elements in the LC resonant unit, which is not limited here.

[0048] On the basis of the above technical solutions, the embedded resonant unit at least includes inductive elements and / or capacitive elements; or the embedded resonant unit includes at least one of a surface acoustic wave resonator and a film bulk acoustic resonator.

[0049] Specifically, the embedded resonant unit can include various types of resonant elements, as long as the performance requirements of the resonator are met. For example, the embedded resonant unit can only include inductive elements or capacitive elements, at this time the inductive elements or the capacitive elements can be embedded into the LC resonant unit as a special resonant element. Or, the embedded resonant unit can include inductive elements and capacitive elements at the same time, at this time the embedded resonant unit is an LC resonator. In other embodiments, the embedded resonant unit can also include at least one of a surface acoustic wave (SAW) resonator and a film bulk acoustic resonator (FBAR).

[0050] The embodiment of the present application also provides a filter.

[0051] Specifically, the filter at least includes the resonator provided by any embodiment of the present application, so it has the beneficial effects of the resonator, which will not be repeated here. In addition, the filter can also include other filter circuits for improving the filtering function of the filter. For example, the other filter circuit can be a low-pass filter circuit, a high-pass filter circuit or a band-pass filter circuit, and the embodiment of the present application is not limited.

[0052] The embodiment of the present application also provides a multiplexer. Figure 12 The structure diagram of a multiplexer provided by the embodiment of the present application is shown in the figure. Figure 12 As shown in the figure, the multiplexer includes the filter 210 provided by any embodiment of the present application.

[0053] With reference to the foregoing Figure 12 The multiplexer comprises a first end IN and at least two second ends; each filter 210 is connected in series between the first end IN and any second end of the multiplexer.

[0054] In particular, Figure 12 The multiplexer comprises a first end IN and n second ends, OUT1, OUT2, OUTn, respectively, as exemplarily shown in FIG. 2. Each filter 210 is connected in series between the first end IN and any second end. For example, the first filter 210 is connected in series between the first end IN and the first second end OUT1, the second filter 210 is connected in series between the first end IN and the second second end OUT2, and so on. Since the multiplexer is provided with the filter 210 of any embodiment of the present application, the multiplexer has the beneficial effects of the filter, which will not be repeated here.

[0055] It should be noted that the multiplexer can further comprise other filter circuits connected in series between the first end IN and any second end, which can be low-pass filter circuits, high-pass filter circuits or band-pass filter circuits, and the embodiments of the present application are not limited in this regard.

[0056] It should be noted that the above only describes the preferred embodiments of the present application and the technical principles applied. It should be understood by those skilled in the art that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A resonator, characterized by, The resonator comprises at least one LC resonant unit and at least one embedded resonant unit. The at least one LC resonant unit comprises at least one resonant element, and the at least one resonant element comprises a first part, a second part and an interface between the first part and the second part. The embedded resonant unit is embeddedly connected with the LC resonant unit through the interface. The resonant element is an inductive element, and the interface is arranged at the middle of the inductive element. The embedded resonant unit is embeddedly connected with the LC resonant unit through the interface, so that the elements in the embedded resonant unit and the elements in the LC resonant unit form a new filter unit, and the input signal is filtered through the new filter unit, so as to improve the filtering effect of the resonator and increase the signal transmission zero point of the filter.

2. The resonator of claim 1, wherein The resonant element comprises at least a first capacitive element and a second capacitive element, the first capacitive element and the second capacitive element are connected in series, and the interface is formed at the series connection point, the first capacitive element is the first part, and the second capacitive element is the second part.

3. The resonator according to any of claims 1-2, characterized in that The interface comprises a first interface and a second interface, and the embedded resonant unit is connected in series between the first interface and the second interface.

4. The resonator according to any one of claims 1-2, characterized in that, A first end of the embedded resonant unit is connected with the interface, and a second end of the embedded resonant unit is connected with a reference potential end.

5. The resonator of claim 1, wherein The resonant elements in the LC resonant unit and the embedded resonant unit are the same or different.

6. The resonator of claim 5, wherein, The embedded resonant unit comprises at least an inductive element and / or a capacitive element; or the embedded resonant unit comprises at least one of a surface acoustic wave resonator and a thin film acoustic resonator.

7. A filter, characterized by The resonator comprises the resonator according to any one of claims 1-6.

8. A multiplexer, characterized by The filter comprises the filter according to claim 7.

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