CN109831177A - A kind of more stop-band filters and its implementation - Google Patents
A kind of more stop-band filters and its implementation Download PDFInfo
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- H—ELECTRICITY
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- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
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Abstract
The present invention provides a kind of more stop-band filters and its implementation, more stop-band filters include: four series resonator groups and three parallel resonator groups, the series resonator group is connected in series between the input port and output port of more stop-band filters, series resonator group is sequentially connected in series by n resonator, the parallel resonator group is connected in parallel respectively between two series resonator groups and a ground terminal, parallel resonator group is successively composed in parallel by n resonator, wherein, n is the stopband number of filter, the resonance frequency of (series resonator group in/parallel resonator group in) each resonator is different；The application realizes more stop-band filter designs by the resonance point of control filter internal resonator, the complexity in design and manufacture is reduced to a certain extent, production cost is drastically reduced, and device dimensions shrink is by about one time, can preferably realize the micromation of device.
Description
Technical field
The present invention relates to semiconductor and micro electro mechanical system fields, more particularly to a kind of more stop-band filters and its realization side
Method.
Background technique
With the development of wireless communication applications, requirement of the people for message transmission rate is higher and higher, transmits with data
Rate is corresponding be frequency spectrum resource high usage and frequency spectrum complication.The complication of communication protocol is for radio frequency system
Various performances propose strict requirements, and in RF front-end module, radio-frequency filter is played a crucial role, it can be incited somebody to action
Out-of-band interference and conjunction noise filtering fall to meet the requirement of radio frequency system and communication protocol for signal-to-noise ratio.
Radio-frequency filter is mainly used in wireless communication system, for example, the radio-frequency front-end of base station, mobile phone, computer are defended
Star communication, radar, electronic warfare system etc..The main performance index of radio-frequency filter is Insertion Loss, Out-of-band rejection, power appearance
Amount, the linearity, device size and cost.The data that good performance of filter can improve communication system to a certain extent pass
Defeated rate, service life and reliability.So being most important for the design of wireless communication system high-performance, simplification filter
's.In the prior art, the mode for generalling use filter parallel connection obtains more stop-band filters, and traditional more stop-band filters pass through
More stop-band filters design that the mode of multiple filter cascades or parallel connection obtains, more stop-band filters have several stopbands that will set
Several molds are counted, Out-of-band rejection is relatively poor, and not only there are certain deteriorations on performance of filter, and manufacturing process is complicated, cost
It is higher, and device size is also larger more complex, still, all has certain complexity in design, manufacture.
Therefore, the device dimensions shrink and construction micromation for how realizing multiple groups band filter are those skilled in the art's mesh
The technical issues of preceding urgent need to resolve.
Summary of the invention
In view of this, the present invention provides a kind of more stop-band filters and its implementation, pass through control filter interior resonance
The resonance point of device realizes more stop-band filter designs, reduces the complexity in design and manufacture to a certain extent, substantially
Degree reduces production cost, and device dimensions shrink is by about one time, can preferably realize the micromation of device.
In a first aspect, providing a kind of more stop-band filters, comprising:
Four series resonator groups and three parallel resonator groups, the series resonator group are connected in series in more stopband filters
Between the input port and output port of wave device, series resonator group is sequentially connected in series by n resonator, the parallel resonance
Device group is connected in parallel respectively between two series resonator groups and a ground terminal, and parallel resonator group is by n resonator
Successively compose in parallel；
Wherein, n is the stopband number of filter, in series resonator group/parallel resonator group) each resonator resonance frequency
Rate is different.
With reference to first aspect and its above-mentioned implementation, in the first possible implementation of the first aspect, described
Parallel resonance group is grounded by bondwire or is grounded by inductance coil in substrate.
With reference to first aspect and its above-mentioned implementation works as n=in the first possible implementation of the first aspect
When 2, more stop-band filters include four series resonator groups and three parallel resonator groups, and the series resonator group series connection connects
It connecing between the input port and output port of more stop-band filters, series resonator group is sequentially connected in series by 2 resonators,
The parallel resonator group is connected in parallel respectively between two series resonator groups and a ground terminal, parallel resonator group
It is successively composed in parallel by 2 resonators；Wherein, the resonance of (series resonator group in/parallel resonator group in) each resonator
Frequency is different.
With reference to first aspect and its above-mentioned implementation, in a third possible implementation of the first aspect, described
The stop-band frequency of more stop-band filters is respectively 2.0GHz, 2.4GHz.Stop-band frequency is simultaneously not fixed, can be by adjusting resonator
Fs, fp, arbitrarily change stop-band frequency.
With reference to first aspect and its above-mentioned implementation, in a fourth possible implementation of the first aspect, described
Parallel resonance group is arranged at resonance on stopband frequency band, and the series resonance group is arranged at antiresonance on stopband frequency band.
With reference to first aspect and its above-mentioned implementation, in the fifth possible implementation of the first aspect, described
Resonator can be thin film bulk acoustic wave resonator FBAR or solid-state assembly acoustic wave piezoelectric resonator SMR.
Second aspect provides the wireless telecom equipment comprising above-mentioned more stop-band filters.
The third aspect provides a kind of implementation method of more stop-band filters, includes the following steps:
(1) it establishes the first band that stop-band frequency is 2.0GHz and hinders filter configuration:
The series resonance frequency of parallel resonance frequency and three parallel resonators that four serial resonant devices are arranged is close,
There is stopband in 2.0GHz；
(2) the second bandstop filter framework that stop-band frequency is 2.4GHz is established:
The series resonance frequency of parallel resonance frequency and three parallel resonators that four serial resonant devices are arranged is close,
There is stopband in 2.4GHz；
(3) first band is hindered into filter configuration, the second bandstop filter architecture combined, obtains more stop-band filters.
Therefore, present applicant proposes a kind of new more stop-band filters, can be realized by controlling the resonance point of resonator
More stop-band filter designs, largely reduce the complexity in design and manufacture, are greatly saved and are produced into
This, and device dimensions shrink is by about one time, can preferably realize the micromation of device.
Detailed description of the invention
Attached drawing for a better understanding of the present invention, does not constitute an undue limitation on the present invention.Wherein:
Fig. 1 is the more stop-band filters of the prior art.
Fig. 2 is the first band stop filter structure of the more stop-band filters of the prior art.
Fig. 3 is that the more stop-band filters of the prior art hinder the second band stop filter structure.
Fig. 4 is the characteristic curve of the first bandstop filter.
Fig. 5 is the characteristic curve of the second bandstop filter.
Fig. 6 is more stop-band filters of the embodiment of the present application.
Fig. 7 is four kinds of resonator impedance characteristic curves in more stop-band filters of the embodiment of the present application.
Fig. 8 is the characteristic curve of more stop-band filters.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
It should be understood that the first, second of described in the text is intended merely to refer to and distinguish different signals, instruction etc., wherein the
One, the second restriction without sequencing.
Fig. 1 shows more stop-band filters of the prior art, as shown in Figure 1, obtained in such a way that filter is in parallel
More stop-band filters are composed in parallel by first order ladder type circuit network 101 and second level ladder type circuit network 102,
First order ladder type circuit network 101 and second level ladder type circuit network 102 are all respectively by level Four series arm (two-stage
Ladder totally 8 resonators) and three-level parallel branch (two-stage ladder totally 6 resonators) constitute, this 14 resonators are divided into
For 4 kinds of resonance frequencies, respectively f0, f1, f2, f3, more stop-band filters realize two resistances by controlling these four resonance frequencies
Band, cardinal principle are as follows.
Fig. 2 shows the first band stop filter structures of the more stop-band filters of the prior art.As shown in Fig. 2, the first order
Ladder type circuit network 101 is the first bandstop filter, and first bandstop filter includes two kinds of resonators, resonator
Resonance frequency is respectively f0, f2, wherein the resonance frequency of series resonator 201 is f0, three FBAR resonators 202 in parallel
Resonance frequency is f2。
Fig. 3 shows the second band stop filter structure of the more stop-band filters of the prior art.As shown in Fig. 2, the second level
Ladder type circuit network 102 is the second bandstop filter, and second bandstop filter includes two kinds of resonators, resonator
Resonance frequency is respectively f1, f3, wherein the resonance frequency of series resonator 301 is f1, three FBAR resonators 302 in parallel
Resonance frequency is f3。
Fig. 4 shows the characteristic curve of the second bandstop filter.As shown in figure 4, the main function of the second bandstop filter
Exactly inhibit the radiofrequency signal at 2.4GHz, i.e., 401 be stop-band frequency, is high impedance status, approximation open circuit at 401；And it is right
It is low impedance state in other frequency points 402, near short circuit, radiofrequency signal can be normal through.Second bandstop filter exists
The impedance of the antiresonance point of series resonator is very big at 2.4GHz, effectively signal can be prevented to pass through, the impedance of parallel resonator
Very little can introduce signal on the ground, effectively signal can also be prevented to pass through, to form stopband at 2.4GHz.
Fig. 5 shows the characteristic curve of the first bandstop filter.As shown in figure 5, the main function of the first bandstop filter
Exactly inhibit the radiofrequency signal at 2GHz, i.e., 501 be stop-band frequency, is high impedance status, approximation open circuit at 501；And for
Other frequency points 502 are low impedance state, and near short circuit, radiofrequency signal can be normal through.First bandstop filter exists
The impedance of the antiresonance point of series resonator is very big at 2.0GHz, effectively signal can be prevented to pass through, the impedance of parallel resonator
Very little can introduce signal on the ground, effectively signal can also be prevented to pass through, to form stopband at 2.0GHz.
Above-mentioned first bandstop filter and the second bandstop filter are subjected to cascade use and obtain more resistances in the prior art
Band filter, filter inhibit radiofrequency signal at 2GHz, 2.4GHz respectively.
Fig. 6 shows more stop-band filters of the embodiment of the present application.As shown in fig. 6, more stop-band filter packets of the application
Four series resonator groups and three parallel resonator groups are included, the series resonator group is connected in series in more stop-band filters
Between input port port1 and output port port2, series resonator group is f by resonance frequency0, f1Resonator be sequentially connected in series
Composition, each parallel resonator group are distinguished one end and are accessed between two neighboring series resonator group, and the other end passes through
Bondwire ground connection is grounded by inductance coil in substrate, and parallel resonator group is f by resonance frequency2, f3Resonator according to
It is secondary to compose in parallel.
Fig. 7 is four kinds of resonator impedance characteristic curves in more stop-band filters of the embodiment of the present application.As shown in fig. 7, more
Four kinds of FBAR resonator impedance curves that stop-band filter is used, wherein 701 (resonant frequency f3), 703 (resonant frequencies
f2) it is parallel resonance group impedance curve, 702 (resonant frequency f1), 704 (resonant frequency f0) it is that the impedance of series resonance group is bent
Series resonance group (702,704) frequency more relatively low than parallel resonance group (701,703) is arranged in line, meanwhile, parallel resonance group
The resonance point impedance of (701,703) is small as far as possible, and the antiresonance point impedance of series resonance group (702,704) is larger as far as possible, in this way
The inhibition of stopband can be much better.
705 be 701 and 702 parallel resonator frequency, adjusts 705 frequency as far as possible close to 2.4GHz, the application's is more
High-impedance state, approximation open circuit can be presented in 2.4GHz in stop-band filter, therefore forms the stop-band frequency of 2.4GHz；Similarly 706
For 703 and 704 parallel resonator frequency, 706 frequency is adjusted as far as possible close to 2GHz, more stop-band filters of the application can be
High-impedance state, approximation open circuit is presented in 2GHz, therefore forms the stop-band frequency of 2GHz.
Fig. 8 shows the characteristic curve of the more stop-band filters of the application.As shown in Figure 8, the more stop-band filters of the application exist
The frequency point of 2GHz and 2.4GHz nearby respectively has a stopband, the approximation passband at other frequencies, wherein the 801 equivalent prior arts
In the first bandstop filter stop-band frequency, the stop-band frequency of 802 equivalent second bandstop filters in the prior art.Originally use
Two filters i.e. the first bandstop filter and the second bandstop filter cascade the more stopband suppression curves being just able to achieve, the present invention
Filter construction 1 filter chip can be used it is achieved that greatly reducing size and cost, have very big
Meaning.
The present embodiment also provides a kind of implementation method of more stop-band filters, includes the following steps:
(1) it establishes the first band that stop-band frequency is 2.0GHz and hinders filter configuration:
Resonant frequency f is set0Four serial resonant devices parallel resonance frequency resonator frequency f2Three parallel connections
The series resonance frequency of resonator is close, stopband occurs in 2.0GHz；
(2) the second bandstop filter framework of stop-band frequency is established:
Resonant frequency f is set1Four serial resonant devices parallel resonance frequency resonator frequency f3Three parallel connections
The series resonance frequency of resonator is close, stopband occurs in 2.4GHz；
(3) first band is hindered into filter configuration, the second bandstop filter architecture combined, obtains more stop-band filters:
First band is hindered into filter configuration, the second bandstop filter architecture combined, i.e., is f by resonance frequency0, f1Resonance
Device is sequentially connected in series four groups of series resonator groups, is f by resonance frequency2, f3Resonator successively to compose in parallel three groups of parallel connections humorous
Vibration device group, series resonator group are connected in series between the input port and output port of more stop-band filters, parallel resonator
Group is connected in parallel respectively between two series resonator groups and a ground terminal, constitutes more stop-band filters.
High-impedance state is presented in one framework at stop-band frequency, what another framework was led directly at this frequency, because
This first band resistance filter configuration, the second bandstop filter framework can be combined directly.
In several embodiments provided herein, it should be understood that disclosed system and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be tied
Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or logical of device or unit
Letter connection can be electrical property, mechanical or other forms.The unit as illustrated by the separation member can be or can also be with
It is not physically separated, component shown as a unit may or may not be physical unit, it can be located at one
A place, or may be distributed over multiple network units.Part therein or complete can be selected according to the actual needs
Portion unit achieves the purpose of the solution of this embodiment.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
Although by reference to attached drawing and combining the mode of preferred embodiment to the present invention have been described in detail, the present invention
It is not limited to this.Without departing from the spirit and substance of the premise in the present invention, those of ordinary skill in the art can be to the present invention
Embodiment carry out various equivalent modifications or substitutions, and these modifications or substitutions all should in covering scope of the invention/appoint
What those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, answer
It is included within the scope of the present invention.Therefore, protection scope of the present invention is answered described is with scope of protection of the claims
It is quasi-.
Claims (8)
1. a kind of more stop-band filters characterized by comprising
Four series resonator groups and three parallel resonator groups；
The series resonator group is connected in series between the input port and output port of more stop-band filters, series resonator
Group is sequentially connected in series by n resonator；
The parallel resonator group is connected in parallel respectively between two series resonator groups and a ground terminal, parallel resonance
Device group is successively composed in parallel by n resonator；
Wherein, n is the stopband number of filter, the resonance frequency of (series resonator group in/parallel resonator group in) each resonator
Rate is different.
2. more stop-band filters according to claim 1, which is characterized in that the parallel resonance group is connect by bondwire
Ground passes through inductance coil ground connection in substrate.
3. more stop-band filters according to claim 2, which is characterized in that as n=2, more stop-band filters include four
A series resonator group and three parallel resonator groups；
The series resonator group is connected in series between the input port and output port of more stop-band filters, series resonator
Group is sequentially connected in series by two resonators；
The parallel resonator group is connected in parallel respectively between two series resonator groups and a ground terminal, parallel resonance
Device group is successively composed in parallel by two resonators；
Wherein, the resonance frequency of (series resonator group in/parallel resonator group in) each resonator is different.
4. more stop-band filters according to claim 3, which is characterized in that the stop-band frequency of more stop-band filters point
Not Wei 2.0GHz, 2.4GHz, this frequency can by adjusting the resonance frequency of resonator carry out flexibly adjustment.
5. more stop-band filters according to claim 1, which is characterized in that the parallel resonance group is arranged at stopband
Resonance on frequency band, the series resonance group are arranged at antiresonance on stopband frequency band.
6. more stop-band filters according to any one of claim 1 to 5, which is characterized in that the resonator is film
Bulk acoustic wave resonator or solid-state assembly acoustic wave piezoelectric resonator.
7. a kind of wireless telecom equipment including more stop-band filters described in claim 1-5 any claim.
8. a kind of implementation method of more stop-band filters, which comprises the steps of:
(1) it establishes the first band that stop-band frequency is 2.0GHz and hinders filter configuration:
The series resonance frequency fs of parallel resonance frequency fp and three parallel resonators that four series resonators are arranged are close,
There is stopband in 2.0GHz；
(2) the second bandstop filter framework that stop-band frequency is 2.4GHz is established:
The series resonance frequency fs of parallel resonance frequency fp and three parallel resonators that four series resonators are arranged are close,
There is stopband in 2.4GHz；
(3) first band is hindered into filter configuration, the second bandstop filter architecture combined, obtains more stop-band filters.
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| CN201811565453.3A CN109831177A (en) | 2018-12-20 | 2018-12-20 | A kind of more stop-band filters and its implementation |
| PCT/CN2019/126241 WO2020125665A1 (en) | 2018-12-20 | 2019-12-18 | Multi-stopband filter and implementation method therefor |
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| CN110768641A (en) * | 2019-10-11 | 2020-02-07 | 天津大学 | Filter circuit, method for improving performance of filter circuit and signal processing equipment |
| CN110798168A (en) * | 2019-10-11 | 2020-02-14 | 天津大学 | Filter circuit, method for improving performance of filter circuit and signal processing equipment |
| CN110798169A (en) * | 2019-10-11 | 2020-02-14 | 天津大学 | Filter circuit, method for improving performance of filter circuit and signal processing equipment |
| CN110798166A (en) * | 2019-10-11 | 2020-02-14 | 天津大学 | Filter circuit, method for improving performance of filter circuit and signal processing equipment |
| CN110995195A (en) * | 2019-11-15 | 2020-04-10 | 天津大学 | Filter with a filter element having a plurality of filter elements |
| CN111010141A (en) * | 2019-11-15 | 2020-04-14 | 天津大学 | Filter, radio frequency front-end circuit and communication device |
| WO2020125665A1 (en) * | 2018-12-20 | 2020-06-25 | 天津大学 | Multi-stopband filter and implementation method therefor |
| CN111600571A (en) * | 2020-01-03 | 2020-08-28 | 诺思(天津)微系统有限责任公司 | Filter, signal processing device and method for manufacturing filter |
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| WO2021143517A1 (en) * | 2020-01-15 | 2021-07-22 | 诺思(天津)微系统有限责任公司 | Multi-channel filter |
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| WO2021203761A1 (en) * | 2020-04-07 | 2021-10-14 | 诺思(天津)微系统有限责任公司 | Filter, multiplexer, and communication device |
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| WO2020125665A1 (en) * | 2018-12-20 | 2020-06-25 | 天津大学 | Multi-stopband filter and implementation method therefor |
| CN110768641A (en) * | 2019-10-11 | 2020-02-07 | 天津大学 | Filter circuit, method for improving performance of filter circuit and signal processing equipment |
| CN110798168A (en) * | 2019-10-11 | 2020-02-14 | 天津大学 | Filter circuit, method for improving performance of filter circuit and signal processing equipment |
| CN110798169A (en) * | 2019-10-11 | 2020-02-14 | 天津大学 | Filter circuit, method for improving performance of filter circuit and signal processing equipment |
| CN110798166A (en) * | 2019-10-11 | 2020-02-14 | 天津大学 | Filter circuit, method for improving performance of filter circuit and signal processing equipment |
| CN110995195A (en) * | 2019-11-15 | 2020-04-10 | 天津大学 | Filter with a filter element having a plurality of filter elements |
| CN111010141A (en) * | 2019-11-15 | 2020-04-14 | 天津大学 | Filter, radio frequency front-end circuit and communication device |
| CN110995195B (en) * | 2019-11-15 | 2023-12-15 | 天津大学 | Filter |
| WO2021093409A1 (en) * | 2019-11-15 | 2021-05-20 | 天津大学 | Filter |
| CN111600571A (en) * | 2020-01-03 | 2020-08-28 | 诺思(天津)微系统有限责任公司 | Filter, signal processing device and method for manufacturing filter |
| WO2021143517A1 (en) * | 2020-01-15 | 2021-07-22 | 诺思(天津)微系统有限责任公司 | Multi-channel filter |
| WO2021169584A1 (en) * | 2020-02-26 | 2021-09-02 | 诺思(天津)微系统有限责任公司 | Method for adjusting filter circuit, and filter, multiplexer and communication device |
| WO2021203761A1 (en) * | 2020-04-07 | 2021-10-14 | 诺思(天津)微系统有限责任公司 | Filter, multiplexer, and communication device |
| CN112615602B (en) * | 2020-11-27 | 2023-04-21 | 中国电子科技集团公司第十三研究所 | Circuit structure of FBAR filter |
| CN112615602A (en) * | 2020-11-27 | 2021-04-06 | 中国电子科技集团公司第十三研究所 | FBAR filter circuit structure |
| CN117335110A (en) * | 2023-12-01 | 2024-01-02 | 成都频岢微电子有限公司 | High roll-off filter and multiplexer |
| CN117335110B (en) * | 2023-12-01 | 2024-04-05 | 成都频岢微电子有限公司 | High roll-off filter and multiplexer |
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| WO2020125665A1 (en) | 2020-06-25 |
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