CN111342805B

CN111342805B - Filter unit with impedance curve adjustment module, filter and electronic equipment

Info

Publication number: CN111342805B
Application number: CN201811550561.3A
Authority: CN
Inventors: 庞慰; 蔡华林
Original assignee: Tianjin University; ROFS Microsystem Tianjin Co Ltd
Current assignee: Tianjin University; ROFS Microsystem Tianjin Co Ltd
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2023-12-15
Anticipated expiration: 2038-12-18
Also published as: CN111342805A

Abstract

The invention relates to a filter unit comprising: a resonator; a cross inversion module; and an adjustment module, wherein: the crossed inverting module is connected with the resonator in parallel; and the adjusting module is connected with the crossed reverse phase module in parallel and is used for adjusting the impedance curve. The invention also relates to a method and a device for adjusting the impedance curve of a resonator. The method comprises the following steps: the impedance curve is adjusted by an adjusting module, and the adjusting module is connected with the resonator in a crossed anti-phase parallel manner and comprises an adjusting electrical device. The device comprises: a cross inversion module; and an adjustment module including an adjustment electrical device, wherein: the crossed inverting module is connected with the resonator in parallel; and the electric device for adjustment is connected in parallel with the cross inversion module and is used for adjusting the impedance curve. The invention also relates to a filter with the filter unit, and an electronic device with the filter unit or the filter or the device.

Description

Filter unit with impedance curve adjustment module, filter and electronic equipment

Technical Field

Embodiments of the present invention relate to the field of semiconductors, and more particularly, to a filter unit, a filter having the filter unit, a method and apparatus for adjusting an impedance curve of a resonator, and an electronic device having the filter or the filter unit or the apparatus.

Background

With the popularization of internet of things, intelligent devices and 5G communication, the demand for high-speed transmission is increasingly urgent. The communication rate and the channel bandwidth have a direct corresponding relation, and increasing the bandwidth of the communication channel is the most direct and effective way to increase the transmission rate. Therefore, the broadband system occupies a very important position in the next generation communication system. The bandwidth and transmission performance of the communication channel depend on the choice of the particular communication bandwidth by the radio frequency front end, and in particular the radio frequency filter, so that a wideband high performance filter becomes a bottleneck for implementing a wideband system.

The resonator is an integral part of the filter and its impedance profile may affect the performance of the overall filter, e.g. the impedance profile determines the selection of a particular communication bandwidth by the filter.

However, the impedance curve of the resonator is fixed since the manufacturing, and there are cases where it is impossible to satisfy different applications, and even if there are different types of resonators on the market, it is difficult to find a resonator having a satisfactory impedance curve.

Disclosure of Invention

The present invention has been made to alleviate or solve at least one of the above-mentioned problems occurring in the prior art.

According to an aspect of an embodiment of the present invention, there is provided a filter unit including: a resonator; a cross inversion module; and an adjustment module including an adjustment electrical device, wherein: the crossed inverting module is connected with the resonator in parallel; and the adjusting electrical device is connected with the crossed reverse phase module in parallel and is used for adjusting the impedance curve.

Optionally, the cross inversion module is a transistor cross coupling structure.

Optionally, the first resonator is an FBAR resonator.

Optionally, the adjusting module further includes a control module for controlling an electrical parameter of the adjusting electrical device, and/or for disconnecting the parallel connection of the adjusting electrical device and the cross inversion module.

Further, the control module comprises a switching device for controlling the disconnection of the electrical device for adjustment and the parallel connection of the cross inversion module, and/or at least one electrical parameter adjustment branch connected with the electrical device for adjustment in parallel, wherein the electrical parameter adjustment branch is used for adjusting the electrical parameter of the electrical device for adjustment. Further, the adjusting electrical device is a capacitor; the electric parameter adjusting branch circuit is a capacitive branch circuit.

Optionally, the resonator is a first resonator; and the electrical device for adjustment is one of the following: one of a capacitor, a second resonator and an inductance; any two of the capacitor, the second resonator and the inductor form a series structure or a parallel structure; the capacitor, the second resonator and the inductor form a circuit structure together.

Further, the adjusting electrical device is a second resonator, and the resonant frequencies of the first resonator and the second resonator are the same and the sizes of the two resonators are different. Alternatively, the adjusting electrical device is a second resonator, and the resonant frequencies of the first resonator and the second resonator are different.

Optionally, the filter unit is divided into an active module and a passive module, wherein the passive module comprises at least a part of the adjustment module and the first resonator, and the active module comprises the cross-inversion module.

Embodiments of the present invention also relate to a method of adjusting an impedance profile of a resonator, comprising the steps of: and adjusting the impedance curve by using an adjusting module, wherein the adjusting module is connected with the resonator in a crossed and anti-phase parallel manner and comprises an adjusting electrical device.

Optionally, "adjusting the impedance profile with an adjustment module" includes the steps of: providing a cross-over phase inversion module, connecting the resonator in parallel with the cross-over phase inversion module, and connecting the tuning electrical device in parallel with the cross-over phase inversion module.

Optionally, at least a part of the adjusting module and the resonator are components of a passive structure, and the cross inversion module is a component of an active structure; and "adjust the impedance curve with an adjustment module" includes the steps of: the gain value of the cross inversion module is selected to cooperate with the adjustment module to adjust the impedance curve of the resonator. Further, the cross inversion module is a transistor cross coupling structure.

Optionally, "adjusting the impedance profile with an adjustment module" includes the steps of: and controlling the electrical parameters of the electrical devices for adjustment and/or disconnecting the electrical devices for adjustment from the cross inversion module in parallel.

In the above method, optionally, the resonator is a first resonator, and the electrical device for adjustment is a circuit structure formed by at least two of a capacitor, a second resonator, and an inductor.

The embodiment of the invention also relates to a device for adjusting the impedance curve of a resonator, which comprises: a cross inversion module; and an adjustment module including an adjustment electrical device, wherein: the crossed inverting module is connected with the resonator in parallel; and the adjusting electrical device is connected with the crossed reverse phase module in parallel and is used for adjusting the impedance curve.

The embodiment of the invention also relates to a filter comprising the filter unit.

Embodiments of the invention also relate to an electronic device comprising a filter as described above or a filter unit as described above or a device as described above for adjusting an impedance profile of a resonator.

Drawings

These and other features and advantages of the various embodiments of the disclosed invention will be better understood from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate like parts throughout the several views, and wherein:

fig. 1 is an equivalent circuit diagram of a prior art resonator;

fig. 2 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention;

FIG. 3 is an impedance plot, wherein the thin line is the impedance plot of the individual resonators in FIG. 1, and the thick line is the impedance plot of the filter unit in FIG. 2;

fig. 4 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention;

fig. 5 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention;

fig. 6 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention;

FIG. 7 is an impedance plot, wherein the thin line is the impedance plot of the individual resonators of FIG. 1 and the thick line is the impedance plot of the filter unit of FIG. 4;

FIG. 8 is an impedance plot, wherein the thin line is the impedance plot of the individual resonators in FIG. 1, and the thick line is the impedance plot of the filter unit in FIG. 5;

FIG. 9 is an impedance plot, wherein the thin line is the impedance plot of the individual resonators of FIG. 1 and the thick line is the impedance plot of the filter unit of FIG. 6;

fig. 10 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention;

fig. 11 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention;

fig. 12 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention;

fig. 13 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention;

fig. 14 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention;

fig. 15 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention;

FIG. 16 is an impedance plot, wherein the thin line is the impedance plot of the individual resonators in FIG. 1, and the thick line is the impedance plot of the filter unit in FIG. 10;

FIG. 17 is an impedance plot, wherein the thin line is the impedance plot of the individual resonators in FIG. 1 and the thick line is the impedance plot of the filter unit in FIG. 11;

FIG. 18 is an impedance plot, wherein the thin line is the impedance plot of the individual resonators in FIG. 1, and the thick line is the impedance plot of the filter unit in FIG. 12;

fig. 19 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention;

fig. 20 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention;

FIG. 21 is an impedance plot, wherein the thin line is the impedance plot of the individual resonators in FIG. 1 and the thick line is the impedance plot of the filter unit in FIG. 19;

FIG. 22 is an impedance plot, wherein the thin line is the impedance plot of the individual resonators in FIG. 1, and the thick line is the impedance plot of the filter unit in FIG. 20;

FIG. 23 is a schematic diagram of a filter according to an exemplary embodiment of the invention;

FIG. 24 is a schematic diagram of a filter according to an exemplary embodiment of the invention;

FIG. 25 is a schematic diagram of a filter according to an exemplary embodiment of the invention;

FIG. 26 is a schematic diagram of a filter according to an exemplary embodiment of the invention;

FIG. 27 is a simulation result of the performance of the filter of FIG. 23;

FIG. 28 is a schematic diagram of an exemplary implementation of the filter unit of FIG. 2;

fig. 29 shows schematically an encapsulation of a filter unit according to the invention;

FIG. 30 is a schematic diagram illustrating the effect of gain variation of an active module on an impedance curve;

fig. 31 is a schematic diagram illustrating a control module of an adjustment module according to one embodiment of the present invention.

Detailed Description

The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of embodiments of the present invention with reference to the accompanying drawings is intended to illustrate the general inventive concept and should not be taken as limiting the invention.

The invention proposes a filter unit comprising: a resonator; a cross inversion module; and an adjustment module including an adjustment electrical device, wherein: the crossed inverting module is connected with the resonator in parallel; and the adjusting electrical device is connected with the crossed reverse phase module in parallel and is used for adjusting the impedance curve.

The filter unit according to the invention is exemplarily described below with reference to the accompanying drawings.

Fig. 1 is an equivalent circuit diagram of a resonator in the prior art. Fig. 1 is an equivalent MBVD model of a resonator, with resistance being the loss term, wherein: the resonance of the series inductance Lm and the series capacitance Cm is the series resonance frequency Fs; the series inductance, series capacitance, and parallel capacitance (i.e., static capacitance) Co produce a parallel resonance Fp, where Fp and Fs are related by fp=fs, sqrt (1+cm/Co), so the larger the parallel capacitance Co, the smaller the Fp-Fs, and the smaller the parallel capacitance Co, the larger the Fp-Fs. In filter design, the bandwidth BW of the filter is generally proportional to 2 x (Fp-Fs). The greater the Fp-Fs, the wider the filter bandwidth that can be achieved.

Fig. 2 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention. In fig. 2, the two ends of the resonator R are connected in parallel with a transistor cross-coupling structure, which is connected in parallel with a capacitor C1. The capacitance C1 here serves to subtract the static capacitance Co of the resonator R. When the static capacitance Co is partially eliminated, the static capacitance Co becomes small, so that the bandwidth of the filter can be greatly expanded. In the embodiment of fig. 2, the capacitor C1 serves as an adjustment electrical device.

In the present invention, the transistors in the transistor cross-coupling structure shown in the drawings are NPN type, but the transistors may be PNP type based on the difference of external power sources. The invention is not limited in terms of the type of transistor.

The transistor cross-coupling structure is a cross-inversion module. The circuit structure which can perform both the inversion function and the cross function can be used in the present invention. In other words, in the present invention, the transistor cross-coupling structure is one embodiment of the cross-inversion module of the present invention.

The filter unit operates and requires an external circuit structure. Fig. 28 is a schematic diagram of an exemplary implementation of the filter unit in fig. 2. However, in the filter shown in fig. 23 to 26, the external circuit structure of the filter unit shown in fig. 28 is not shown.

In the present invention, an FBAR resonator is taken as an example of the resonator. As will be appreciated by those skilled in the art, the resonator in the present invention may also be other types of piezoelectric resonators.

Fig. 3 is an impedance graph in which thin lines are impedance curves of the individual resonators in fig. 1 and thick lines are impedance curves of the filter unit in fig. 2. As can be seen from fig. 3, the difference between Fp and Fs increases significantly, so that higher bandwidths can be achieved when using this unit to design the filter.

Fig. 27 is a result of a performance simulation of the filter of fig. 23, in which the filter of fig. 23 uses the filter unit of fig. 2. As shown in fig. 27, a high bandwidth filter of 2.4-2.8GHz is implemented using a common FBAR resonator. It is apparent that the coupling coefficient of the filter is significantly improved and the bandwidth of the filter is extended.

The following illustrates why the circuit configuration in fig. 2 can expand the bandwidth of the filter. Referring to fig. 2, from the operating principle of the transistor, i=gm (-V1-V2) and from the impedance and current relationship across the capacitor C1, i=2v2×jωc can be found. From these two formulas one can get: the impedance of the V1 end is Z= -1/gm-1/2j omega C, wherein the real part is negative resistance, the imaginary part is negative capacitance, the negative resistance of the real part can counteract the loss in the circuit, so that the loss can be reduced, the insertion loss is improved, the static capacitance of the resonator can be reduced by the negative capacitance of the imaginary part, the bandwidth can be expanded, and the high-bandwidth filter can be realized.

As can be appreciated by those skilled in the art, it is also within the scope of the present invention to utilize negative resistance to improve the insertion loss of the filter.

A control module may also be added to the filter unit for controlling the electrical parameters of the electrical device for adjustment and/or for disconnecting the electrical device for adjustment from the cross-inverting module in parallel.

More specifically, the control module includes a switching device for controlling the disconnection of the electrical device for adjustment in parallel with the crossed inverting module, and/or includes at least one electrical parameter adjustment branch connected in parallel with the electrical device for adjustment, the electrical parameter adjustment branch being used for adjusting an electrical parameter of the electrical device for adjustment.

Fig. 31 is a schematic diagram illustrating a control module of an adjustment module according to one embodiment of the present invention. As shown in fig. 31, two electric parameter adjustment branches are provided in the lower virtual frame, and each branch is provided with parallel capacitors C21 and C22 for adjustment and a transistor as a switch. In the two adjusting branches, the parallel capacitors for adjustment can have the same capacitance value or different capacitance values. Although two electrical parameter adjustment branches are shown in fig. 31, only one branch may be provided, or more branches may be provided. By selecting the capacitance value of the parallel adjustment capacitor and the number of branches connected in parallel to the capacitor C1 as the adjustment electric device, the electric parameter of the adjustment electric device connected in parallel to the cross inversion module can be selected or adjusted, and for example, in fig. 31, the final capacitance value thereof can be adjusted.

In fig. 31, an upper virtual frame corresponds to a filter unit of the present invention, and an upper virtual frame corresponds to a control module of the adjustment module. Based on fig. 31, the control module of the adjustment module may include at least one electrical parameter adjustment branch connected in parallel with the electrical device for adjustment, the electrical parameter adjustment branch being used to adjust an electrical parameter of the electrical device for adjustment.

In the example shown in fig. 31, the electrical device for adjustment is a capacitor, and the electrical parameter adjustment branch is a capacitive branch. In addition, although not shown, a switch may be provided on the circuit in which the adjustment electrical device is located to control whether the adjustment module is used to adjust the impedance profile. Since the piezoelectric filter has a small piezoelectric coupling coefficient, which directly corresponds to the bandwidth, it is difficult for such a filter to realize a high bandwidth filter. For example, for an FBAR filter, the static capacitance at both input and output ends is the most fundamental cause of limiting the electromechanical coupling coefficient, and eliminating the static capacitance is an effective way to increase the electromechanical coupling coefficient and even the bandwidth.

For example, in the example shown in fig. 2, the use of an adjustment electrical device may act to reduce the static capacitance.

The filter unit shown in fig. 4-6 is a variant of the filter unit based on fig. 2.

Fig. 4 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention; fig. 7 is an impedance graph in which thin lines are impedance curves of the individual resonators in fig. 1 and thick lines are impedance curves of the filter unit in fig. 4. In fig. 4, the two FBAR resonators R and R1 have the same resonance frequency but different sizes, so that the two resonators cancel each other, and the overall capacitance is reduced, which corresponds to a reduction in resonator area. In the embodiment of fig. 4, the resonator R1 is an adjusting electric device. As can be seen from fig. 7, the resonator area is reduced as a whole, and the overall equivalent capacitance is reduced. The two resonator areas can be adjusted to achieve different degrees of cancellation.

Fig. 5 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention; fig. 8 is an impedance graph in which thin lines are impedance curves of the individual resonators in fig. 1 and thick lines are impedance curves of the filter unit in fig. 5. The tuning electrical device in fig. 5 is an inductance L1, which is a substantial increase in capacitance, narrowing the bandwidth, but increasing the roll-off, which is beneficial for narrowband applications. As can be seen from fig. 8, the difference between Fp and Fs is reduced, reducing the bandwidth, but a narrow band high roll-off filter can be implemented because the roll-off of Fp to Fs is faster.

Fig. 6 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention; fig. 9 is an impedance graph in which thin lines are impedance curves of the individual resonators in fig. 1 and thick lines are impedance curves of the filter unit in fig. 6. In fig. 6, a parallel structure of an inductance L1 and a capacitance C1 is used as an adjustment electric device. In general, the bandwidth of the filter unit in fig. 6 is between the bandwidth of fig. 5 and the bandwidth of fig. 4, and the effect is that the equivalent capacitance on the left side of the resonance frequency Fs is increased, the equivalent capacitance on the right side of Fp is reduced, and thus, better impedance mismatch in-band and out-of-band can be achieved, and roll-off is effectively improved under the condition that the bandwidth is not affected. As can be seen from fig. 9, the frequencies Fs, fp are unchanged, but the equivalent impedance to the right of Fp increases, the equivalent impedance to the left of Fs decreases, and when this resonator R1 is placed in parallel, fp is in the passband, a larger impedance improves the matching, fs is outside the passband, and a smaller impedance improves the out-of-band rejection.

Fig. 10 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention; fig. 16 is an impedance graph in which thin lines are impedance curves of the individual resonators in fig. 1 and thick lines are impedance curves of the filter unit in fig. 10. As shown in fig. 10, the adjustment electric device is constituted by a parallel structure of a capacitor C1 and a resonator R1. As shown in fig. 16, the difference between frequencies Fp and Fs increases significantly, so that a higher bandwidth can be achieved when the filter is designed using this unit.

Fig. 11 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention; fig. 17 is an impedance graph in which thin lines are impedance curves of the individual resonators in fig. 1 and thick lines are impedance curves of the filter unit in fig. 11. As shown in fig. 11, the adjustment electric device is constituted by a parallel structure of an inductance L1 and a resonator R1. As shown in fig. 17, the difference between Fp and Fs is reduced, reducing the bandwidth, but since Fp to Fs roll off faster, a filter with a compromise in bandwidth but improved roll off can be implemented in a region of a particular high roll off.

Fig. 12 is a schematic diagram of a filter unit according to an exemplary embodiment of the invention; fig. 18 is an impedance graph in which thin lines are impedance curves of the individual resonators in fig. 1 and thick lines are impedance curves of the filter unit in fig. 12. As shown in fig. 12, the adjustment electric device is constituted by a parallel structure of a capacitor C1, a resonator R1, and an inductance L1. As can be seen from fig. 18, the frequencies Fs, fp are unchanged, but the equivalent impedance to the right of Fp increases, the equivalent impedance to the left of Fs decreases, and when this resonator R1 is placed in parallel, fp is in the passband, a larger impedance improves the matching, fs is outside the passband, and a smaller impedance improves the out-of-band rejection.

Fig. 13 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention, in which an adjusting electrical device is formed by a circuit structure formed by connecting a capacitor C1 and an inductance L1 in parallel and then connecting the capacitor C1 in series with a resonator R1.

Fig. 14 is a schematic diagram of inductive coupling according to an exemplary embodiment of the present invention, in which the electrical device for tuning is formed by a series structure of a capacitor C1 and a resonator R1.

Fig. 15 is a schematic diagram of inductive coupling according to an exemplary embodiment of the present invention, in which the electrical device for adjustment is constituted by a series structure of an inductance L1 and a resonator R1.

Fig. 19 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention, in which resonance frequencies of a resonator R and a resonator R1 are different from each other. Fig. 21 is an impedance graph in which thin lines are impedance curves of the individual resonators in fig. 1 and thick lines are impedance curves of the filter unit in fig. 19. In the impedance curve shown in fig. 21, a wider region of low impedance is created to the left of Fs. The resonator R1 is used as a parallel resonator of the filter, the Fs frequency is located outside the filter band, and a wider low-impedance area can realize that the area with wider critical band has better out-of-band rejection characteristics.

Fig. 20 is a schematic diagram of a filter unit according to an exemplary embodiment of the present invention; fig. 22 is an impedance graph in which thin lines are impedance curves of the individual resonators in fig. 1 and thick lines are impedance curves of the filter unit in fig. 20. In the impedance curve shown in fig. 22, a low impedance point and a high impedance point are added between Fs and Fp in this structure, and the transformation of the low impedance and the high impedance is faster, so that more flexibility is added in the design of the filter, and good matching and suppression effects of specific positions can be formed by using this impedance characteristic.

Fig. 23 is a schematic diagram of a filter according to an exemplary embodiment of the present invention, wherein the filter unit exemplary employs the embodiment of fig. 2. Reasonable input-output matching and ground inductance can be included in the diagram.

Fig. 24 is a schematic diagram of a filter according to an exemplary embodiment of the invention, wherein the present filter unit is used on the serial branch of the filter and not on the parallel branch.

Fig. 25 is a schematic diagram of a filter according to an exemplary embodiment of the present invention, wherein only one resonator comprises a filter unit of the present invention.

Fig. 26 is a schematic diagram of a filter according to an exemplary embodiment of the invention, wherein the filter unit of the invention is not used on the serial branches of the filter, but only on the parallel branches.

Fig. 29 shows an exemplary packaging schematic of a filter unit according to the invention. Fig. 29 shows a connection form between an active module and a passive module, where the active die is an active circuit and a module, and the passive die includes components such as a resonator, an inductor, and a capacitor, where the inductor and the capacitor may be on the same die as the resonator, or may be implemented as another single die or on a package. The capacitor, the inductor, and the like, which are the adjustment electric devices, may be provided in the active structure based on actual needs. The control module shown in fig. 31 may be provided in an active structure.

Fig. 30 illustrates a schematic diagram showing the effect of gain variation of an active module on an impedance curve. When the gains of the active modules, for example, the gains of the transistors are 5, 10, and 15dB, respectively, the corresponding Fp impedance (Rp) is from small to large, and the larger Rp is, the lower the passband insertion loss of the filter is in design, the larger the out-of-band rejection is, but the larger the gain of the corresponding active structure is, the larger the power consumption is.

Based on the above, the present invention also proposes a method for adjusting an impedance curve of a resonator, comprising:

step 1: selecting a cross inversion module and an adjustment module, wherein the adjustment module comprises an adjustment electrical device;

step 2: connecting the resonator in parallel with the cross inversion module and connecting the adjustment electrical device in parallel with the cross inversion module; and

step 3: and adjusting the impedance curve of the resonator by using the adjusting electrical device.

Based on the above, the present invention also proposes a method for adjusting an impedance curve of a resonator, comprising the steps of: and adjusting the impedance curve by using an adjusting module, wherein the adjusting module is connected with the resonator in a crossed and anti-phase parallel manner and comprises an adjusting electrical device.

Further, "adjusting the impedance curve with an adjustment module" includes the steps of: the gain value of the cross inversion module is selected to cooperate with the adjustment module to adjust the impedance curve of the resonator. Further, the cross-inversion module is a transistor cross-coupling structure.

Optionally, the resonator is a first resonator; the electric device for adjustment is a circuit structure formed by at least two of a capacitor, a second resonator and an inductor.

Embodiments of the invention also relate to an apparatus for adjusting an impedance profile of a resonator, comprising: a cross inversion module; and an adjustment module including an adjustment electrical device, wherein: the crossed inverting module is connected with the resonator in parallel; and the adjusting electrical device is connected with the crossed reverse phase module in parallel and is used for adjusting the impedance curve.

The embodiment of the invention also relates to an electronic device comprising the filter unit or the filter. It should be noted that, the electronic devices herein include, but are not limited to, intermediate products such as a radio frequency front end, a filtering and amplifying module, and end products such as a mobile phone, a WIFI, and an unmanned aerial vehicle.

Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims

1. A filter unit comprising:

a resonator;

the cross inversion module is used for performing an inversion function and a cross function; and

the adjusting module comprises an adjusting electric device, wherein the adjusting electric device comprises at least one device of a resonator, a capacitor and an inductor,

wherein:

the crossed inverting module is connected with the resonator in parallel; and is also provided with

The adjusting electrical device is connected with the crossed reverse phase module in parallel and is used for adjusting the impedance curve of the resonator.

2. The filter unit of claim 1, wherein:

the cross inversion module is a transistor cross coupling structure.

3. The filter unit of claim 1, wherein:

the resonator is an FBAR resonator.

4. The filter unit of claim 1, wherein:

the adjusting module further comprises a control module for controlling the electric parameters of the electric devices for adjustment and/or for disconnecting the electric devices for adjustment from the cross inversion module in parallel.

5. The filter unit of claim 4, wherein:

the control module comprises a switching device for controlling the disconnection of the electrical device for adjustment and the parallel connection of the cross inversion module, and/or at least one electrical parameter adjustment branch connected with the electrical device for adjustment in parallel, wherein the electrical parameter adjustment branch is used for adjusting the electrical parameter of the electrical device for adjustment.

6. The filter unit of claim 5, wherein:

the electric device for adjustment is a capacitor;

the electric parameter adjusting branch circuit is a capacitive branch circuit.

7. The filter unit according to any one of claims 1-5, wherein:

the resonator is a first resonator; and is also provided with

The electrical device for adjustment is one of the following:

one of a capacitor, a second resonator and an inductance;

any two of the capacitor, the second resonator and the inductor form a series structure or a parallel structure;

the capacitor, the second resonator and the inductor form a circuit structure together.

8. The filter unit of claim 7, wherein:

the adjusting electrical device is a second resonator; and is also provided with

The first resonator and the second resonator have the same resonant frequency and are different in size.

9. The filter unit of claim 7, wherein:

The first resonator and the second resonator have different resonant frequencies.

10. The filter unit according to any one of claims 1-5, wherein:

the filter unit is divided into an active module and a passive module, wherein the passive module includes at least a portion of the adjustment module and the resonator, and the active module includes the cross-inversion module.

11. A method of adjusting an impedance profile of a resonator, comprising the steps of:

the impedance curve is adjusted by an adjusting module, the adjusting module is connected with the resonator in a crossed and anti-phase parallel manner and comprises an adjusting electrical device, and the adjusting electrical device comprises at least one device of the resonator, a capacitor and an inductor;

the step of adjusting the impedance curve by an adjustment module comprises the steps of: providing a cross inversion module, enabling the resonator to be connected with the cross inversion module in parallel and enabling the electric device for adjustment to be connected with the cross inversion module in parallel, wherein the cross inversion module is used for playing an inversion role and a cross role.

12. The method according to claim 11, wherein:

at least one part of the adjusting module and the resonator are components of a passive structure, and the crossed inverting module is a component of an active structure;

the step of adjusting the impedance curve by an adjustment module comprises the steps of: the gain value of the cross inversion module is selected to cooperate with the adjustment module to adjust the impedance curve of the resonator.

13. The method according to claim 11, wherein:

the cross inversion module is a transistor cross coupling structure.

14. The method of any one of claims 11-13, wherein:

the step of adjusting the impedance curve by an adjustment module comprises the steps of: and controlling the electrical parameters of the electrical devices for adjustment and/or disconnecting the electrical devices for adjustment from the cross inversion module in parallel.

15. The method of any one of claims 11-13, wherein:

the resonator is a first resonator;

the electric device for adjustment is one of a capacitor, a second resonator and an inductor, or a circuit structure formed by at least two of the capacitor, the second resonator and the inductor.

16. The method according to claim 14, wherein:

the resonator is a first resonator;

17. An apparatus for adjusting an impedance profile of a resonator, comprising:

a cross inversion module; and

the adjusting module comprises an adjusting electric device,

wherein:

The adjusting electrical device is connected with the crossed reverse phase module in parallel and is used for adjusting the impedance curve.

18. The apparatus of claim 17, wherein:

the cross inversion module is a transistor cross coupling structure.

19. The apparatus of claim 17, wherein:

20. The apparatus of claim 19, wherein:

the control module comprises a switching device for controlling the disconnection of the electrical device for adjustment and the parallel connection of the cross-inverting module, and/or

The control module comprises at least one electric parameter adjusting branch connected with the electric device for adjustment in parallel, and the electric parameter adjusting branch is used for adjusting the electric parameter of the electric device for adjustment.

21. The apparatus of claim 19, wherein:

the resonator is a first resonator; and is also provided with

The electric device for adjustment is a capacitor, or a series structure or a parallel structure formed by the capacitor and the second resonator.

22. The apparatus of claim 20, wherein:

the electric device for adjustment is a capacitor;

the electric parameter adjusting branch circuit is a capacitive branch circuit.

23. A filter comprising a filter unit according to any of claims 1-10.

24. An electronic device comprising a filter according to claim 23, or a filter unit according to any of claims 1-10, or a means of adjusting the impedance curve of a resonator according to any of claims 17-22.