CN207947757U - Bandwidth-limited circuit and multiplexer - Google Patents
Bandwidth-limited circuit and multiplexer Download PDFInfo
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- CN207947757U CN207947757U CN201820854823.4U CN201820854823U CN207947757U CN 207947757 U CN207947757 U CN 207947757U CN 201820854823 U CN201820854823 U CN 201820854823U CN 207947757 U CN207947757 U CN 207947757U
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- filter
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Abstract
The utility model discloses a kind of bandwidth-limited circuit and multiplexer, wherein bandwidth-limited circuit includes the first filter circuit unit；First filter circuit unit includes：The first acoustic resonator and the second acoustic resonator being connected in series with；First circuit element, the first circuit element are in parallel with the first acoustic resonator；Second circuit element, second circuit element are in parallel with the second acoustic resonator；Tertiary circuit element, the first end of tertiary circuit element are connect with the public connecting end of the first acoustic resonator and the second acoustic resonator, the second end ground connection of tertiary circuit element；Wherein, the first circuit element and second circuit element are capacitive element, and tertiary circuit element is inductive element；Alternatively, the first circuit element and second circuit element are inductive element, tertiary circuit element is capacitive element.The bandwidth-limited circuit and multiplexer that the utility model embodiment provides have high inhibit and the wide characteristic of wideband.
Description
Technical field
The utility model embodiment is related to filtering technique more particularly to a kind of bandwidth-limited circuit and multiplexer.
Background technology
Filter circuit is widely used in integrated circuit, such as is used in the multiplexer of integrated circuit.Wideband is wide, height suppression
Bottleneck when multiplexer design processed is often IC design.
It is filtered by acoustic wave filter, can solve the problems, such as that filter circuit cannot achieve height and inhibit, however sound wave
Though filter has high the advantages of inhibiting, the wide filter of wideband cannot achieve.
How to keep high inhibition and the wide characteristic of wideband is always a great problem of multiplexer design.
Utility model content
A kind of bandwidth-limited circuit of the utility model offer and multiplexer, to realize the filtering of the wide and high rejection characteristic of wideband
Circuit and multiplexer design.
In a first aspect, the utility model embodiment provides a kind of bandwidth-limited circuit.The bandwidth-limited circuit includes the
One filter circuit unit；
The first filter circuit unit includes：
The first acoustic resonator and the second acoustic resonator being connected in series with；
First circuit element, first circuit element are in parallel with first acoustic resonator；
Second circuit element, the second circuit element are in parallel with second acoustic resonator；
Tertiary circuit element, the first end of the tertiary circuit element and first acoustic resonator and described second
The public connecting end of acoustic resonator connects, the second end ground connection of the tertiary circuit element；
Wherein, first circuit element and the second circuit element are capacitive element, the tertiary circuit member
Part is inductive element；Alternatively, first circuit element and the second circuit element are inductive element, the third
Circuit element is capacitive element；
Optionally, the bandwidth-limited circuit further includes the second filtering being connected in series with the first filter circuit unit
Circuit unit, the first filter circuit unit and the second filter circuit unit include first end and second end；
Wherein, first acoustic resonator and the second acoustic resonator are connected in series in the first filter circuit unit
First end and second end between, the first of the second end of the second filter circuit unit and the first filter circuit unit
End connection；Or second the first end of filter circuit unit connect with the second end of the first filter circuit unit.
Optionally, the second filter circuit unit is low-pass filter circuit unit, first circuit element and second
Circuit element uses capacitive element, the tertiary circuit element to use inductor element.
Optionally, the second filter circuit unit is high-pass filtering circuit unit, first circuit element and described
Second circuit element uses inductive element, the tertiary circuit element to use capacitive element.
Optionally, the second filter circuit unit is active power filtering unit or passive filtering unit.
Second aspect, the utility model embodiment additionally provide a kind of multiplexer, which includes at least one first
The bandwidth-limited circuit of aspect.
Optionally, the multiplexer further includes a first end and at least two second ends；
The the first filter circuit unit and the second filter circuit unit of each bandwidth-limited circuit are connected in series in institute
It states between the first end of multiplexer and a second end.
Optionally, the multiplexer further includes at least one third filter circuit unit；
The third filter unit is connected between the first end of the multiplexer and a second end.
Wherein, the first end and second end of the multiplexer is used as input/output terminal.
Bandwidth-limited circuit and multiplexer provided by the utility model use lamped element and acoustic resonator in circuit
It is combined, constitutes filter circuit, which has high inhibit and the wide characteristic of wideband.
Description of the drawings
Fig. 1 is the circuit diagram that the utility model implements a kind of bandwidth-limited circuit provided；
Fig. 2 is the circuit diagram that the utility model implements another bandwidth-limited circuit provided；
Fig. 3 is a kind of circuit diagram showing bandwidth-limited circuit connecting pin that the utility model embodiment provides；
Fig. 4 is the circuit diagram that the another kind that the utility model embodiment provides shows bandwidth-limited circuit connecting pin；
Fig. 5 is the S parameter analogous diagram for circuit shown in Fig. 3 that the utility model embodiment provides；
Fig. 6 is the S parameter analogous diagram for circuit shown in Fig. 3 that the utility model embodiment provides；
Fig. 7 is a kind of circuit diagram for multiplexer that the utility model embodiment provides.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, it illustrates only for ease of description, in attached drawing and the relevant part of the utility model rather than entire infrastructure.
Fig. 1 is the circuit diagram that the utility model implements a kind of bandwidth-limited circuit provided, and Fig. 2 is that the utility model is implemented
The circuit diagram for another bandwidth-limited circuit that example provides.
It please refers to Fig.1 and Fig. 2, the bandwidth-limited circuit that the utility model embodiment provides includes the first filter circuit unit
11；
First filter circuit unit 11 includes：
The first acoustic resonator 101 and the second acoustic resonator 102 being connected in series with；
First circuit element 103, the first circuit element 103 are in parallel with the first acoustic resonator 101；
Second circuit element 104, second circuit element 104 are in parallel with the second acoustic resonator 102；
Tertiary circuit element 105, the first end of tertiary circuit element 105 and the first acoustic resonator 101 and the rising tone
The public connecting end of wave resonator 102 connects, the second end ground connection of tertiary circuit element 105；
In circuit shown in Fig. 1, the first circuit element 103 and second circuit element 104 are capacitive element, third
Circuit element 105 is inductive element.
In circuit shown in Fig. 2, the first circuit element 103 and second circuit element 104 are inductive element, third
Circuit element 105 is capacitive element.First acoustic resonator 101 and the second acoustic resonator 102 can be, but not limited to sound table
Surface wave (Surface Acoustic Wave, SAW), bulk acoustic wave (Bulk Acoustic Wave, BAW), film bulk acoustic resonator
Device (Film Bulk Acoustic Resonator, FBAR) is realized.First circuit element, second circuit element and third
Circuit element can be, but not limited to low-temperature co-fired ceramics (Low Temperature Co-fired Ceramic, LTCC), surface
Mounting technology (Surface Mount Devices, SMD) is realized.
Conventional filter circuit unit generally has several lumps lump elements, such as capacitance, inductance and resistance are constituted, structure
At filter circuit bandwidth it is relatively wide, however rejection characteristic is poor.Or filter circuit unit uses several sound wave resonances
The rejection characteristic of device, filter circuit unit is improved, but the bandwidth of filter circuit unit is relatively narrow.Utility model people is studying
Process discovery, the first circuit element 103, second circuit element 104 and tertiary circuit element 105 and two acoustic resonators
The first filter circuit unit 11 that (the first acoustic resonator 101 and the second acoustic resonator 102) is constituted, there is the first filter circuit
11 bandwidth-limited circuits constituted not only have high inhibition, but also bandwidth is wider, and circuit characteristic is greatly improved.This practicality
The bandwidth-limited circuit unit that new embodiment provides, there is low pass or high-pass filtering circuit unit, acoustic resonator, capacitive character
Element and resistance element combination realize there is high inhibition and the wide characteristic of wideband.
Please continue to refer to Fig. 1 and Fig. 2, the bandwidth-limited circuit that the utility model embodiment provides further includes and described first
The second filter circuit unit 12 that filter circuit unit 11 is connected in series with, the first filter circuit unit 11 and the second filter circuit list
Member 12 includes first end and second end；Referring to FIG. 1, the connecting pin a1 and b1 of the first filter circuit is respectively as the first filtering
The first end and second end of circuit unit 11.It will be understood by those skilled in the art that connecting pin a1 and b1 can also be respectively as
The second end and first end of first filter circuit unit 11.Equally, connecting pin a2 and b2 can be respectively as the second filtered electrical
The first end and second end of road unit 12 also can be used as the second end and first end of the second filter circuit unit 12.And first
Two not connected connecting pins between filter circuit unit 11 and the first filter circuit unit 12 can be used as bandpass filtering electricity
The first end of the first end and second end on road, such as in Fig. 1, connecting pin b1 and connecting pin a2 respectively as bandwidth-limited circuit 10
And second end, or second end and first end as bandwidth-limited circuit 10.The first end of bandwidth-limited circuit 10 can be
Input terminal can also be output end, and second end can also be that input terminal can also be output end.
Wherein, the first acoustic resonator 101 and the second acoustic resonator 102 are connected in series in the first filter circuit unit
Between first end and second end, the second end of the second filter circuit unit 12 is connect with the first end of the first filter circuit unit.
It should be noted that the second filter circuit unit 12 can be filter circuit unit in the prior art, Ji Nengshi
The circuit now filtered.Second filter circuit unit 12 can be active power filtering unit or passive filtering unit, Ke Yigen
It is configured according to actual application circuit, the utility model embodiment is not construed as limiting.
It in the utility model embodiment, continues to refer to figure 1, the second filter circuit unit 12 can be low-pass filter circuit list
Member, correspondingly, the first circuit element 103 and second circuit element 104 use capacitive element, tertiary circuit element 105 to use
Inductor element.That is, the first circuit element 103, second circuit element 104 and tertiary circuit element 105 constitute
High-pass filtering circuit unit.First filter circuit unit 11 and the second filter circuit unit 12 constitute bandwidth-limited circuit.
In the utility model embodiment, with continued reference to Fig. 2, the second filter circuit unit 12 is high-pass filtering circuit list
Member, correspondingly, the first circuit element 103 and second circuit element 104 use inductive element, tertiary circuit element 105 to use
Capacitive element.That is, the first circuit element 103, second circuit element 104 and tertiary circuit element 105 constitute it is low
Bandpass filter circuit unit.First filter circuit unit 11 and the second filter circuit unit 12 constitute bandwidth-limited circuit.
Fig. 3 is a kind of circuit diagram showing bandwidth-limited circuit connecting pin that the utility model embodiment provides, and Fig. 4 is this
The another kind that utility model embodiment provides shows the circuit diagram of bandwidth-limited circuit connecting pin.It please refers to Fig.3 and Fig. 4, upper
On the basis of stating embodiment, the first filter circuit unit 11 and the second filter circuit unit 12 are series at bandwidth-limited circuit 10
Between first end A and second end B, wherein first end A is input terminal, and second end B is output end and/or second end B is input
End, first end A are output end, can configure port according to specific use demand.
The technique effect of the technical solution of the utility model embodiment offer is provided.Fig. 5 is that this practicality is new
The S parameter analogous diagram for circuit shown in Fig. 3 that type embodiment provides is indulged and is sat referring to FIG. 5, the unit of abscissa is GHz
Target unit is dB, and t1 indicates that the intermediate zone bandwidth of the bandwidth-limited circuit, width very little show circuit tool shown in Fig. 3
There are high rejection characteristic, t2 to indicate that the band connection frequency of the bandwidth-limited circuit, bandwidth range are about 500MHz (2.3GHz-
2.8GHz), there is wider bandwidth.Following table is please referred to, following table is that the utility model implements the filter circuit (filter) provided
With in the prior art, the parameter comparison table of LTCC filters and SAW filter.
It can be seen that although LTCC filters have wider passband, but its t1 value is 230MHz, and intermediate zone is wider, band
It is outer to inhibit poor；SAW filter, intermediate zone is relatively narrow, has high rejection characteristic, but passband is relatively narrow.And the utility model embodiment
The filter of offer not only has broad passband, but also has high rejection characteristic, and intermediate zone width can use different filter works
Skill is designed.Multiplexer performance compared with the prior art in filter be greatly improved.
Fig. 6 is the S parameter analogous diagram for circuit shown in Fig. 3 that the utility model embodiment provides, referring to FIG. 6,
The unit of abscissa is GHz, and the unit of ordinate is dB.T3 indicates the intermediate zone frequency of the bandwidth-limited circuit, and width is very
It is small, show that there is circuit shown in Fig. 4 high rejection characteristic, t4 to indicate that the band connection frequency of the bandwidth-limited circuit, bandwidth range are big
It is generally 800MHz (1.4GHz-2.2GHz), there is wider bandwidth.
Conceived based on same utility model, the utility model embodiment additionally provides a kind of multiplexer, referring to FIG. 7, should
Multiplexer includes the bandwidth-limited circuit 10 that at least one the utility model any embodiment provides, which further includes one
First end and at least two second ends；Such as include a first end IN, n second end, respectively OUT1, OUT2 ...,
OUTn。
The the first filter circuit unit and the second filter circuit unit of each bandwidth-limited circuit 10 are connected in series in multiplexing
Between the first end of device and a second end, such as the first filter circuit unit and second of first bandwidth-limited circuit 10 filters
Circuit unit is connected in series between the first end IN of multiplexer and second end OUT1.The first end of multiplexer and at least one second
Using the bandwidth-limited circuit for having the utility model any embodiment to provide between end, which has high inhibition and wideband wide
Characteristic.The first end and second end of multiplexer is used as input/output terminal.That is, multiplexer is usually two-way, the
One end and second end can input signal, can also output signal.
Optionally, with continued reference to Fig. 7, the multiplexer that the utility model embodiment provides further includes at least one third filtering
Circuit unit 13；Third filter unit 13 is connected between the first end of multiplexer and a second end.That is, in this practicality
Can also include it in addition to having used bandwidth-limited circuit provided by the utility model in the multiplexer that new embodiment provides
The filter circuit unit of his type, third filter circuit unit 13 can be low-pass filter circuit unit, high-pass filtering circuit list
Member or bandwidth-limited circuit unit, can be matched according to specific application circuit.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright
Aobvious variation is readjusted and is substituted without departing from the scope of protection of the utility model.Therefore, although passing through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
Can also include other more equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Right determine.
Claims (9)
1. a kind of bandwidth-limited circuit, which is characterized in that including the first filter circuit unit；
The first filter circuit unit includes：
The first acoustic resonator and the second acoustic resonator being connected in series with；
First circuit element, first circuit element are in parallel with first acoustic resonator；
Second circuit element, the second circuit element are in parallel with second acoustic resonator；
Tertiary circuit element, the first end of the tertiary circuit element and first acoustic resonator and second sound wave
The public connecting end of resonator connects, the second end ground connection of the tertiary circuit element；
Wherein, first circuit element and the second circuit element are capacitive element, and the tertiary circuit element is
Inductive element；Alternatively, first circuit element and the second circuit element are inductive element, the tertiary circuit
Element is capacitive element.
2. bandwidth-limited circuit according to claim 1, which is characterized in that further include and the first filter circuit unit
The second filter circuit unit being connected in series with, the first filter circuit unit and the second filter circuit unit include the
One end and second end；
Wherein, first acoustic resonator and the second acoustic resonator are connected in series in the of the first filter circuit unit
Between one end and second end, the second end of the second filter circuit unit and the first end of the first filter circuit unit connect
It connects, alternatively, the first end of the second filter circuit unit is connect with the second end of the first filter circuit unit.
3. bandwidth-limited circuit according to claim 2, which is characterized in that the second filter circuit unit is low pass filtered
Wave circuit unit, first circuit element and second circuit element use capacitive element, the tertiary circuit element to use
Inductor element.
4. bandwidth-limited circuit according to claim 2, which is characterized in that the second filter circuit unit is filtered for high pass
Wave circuit unit, first circuit element and the second circuit element use inductive element, the tertiary circuit element
Using capacitive element.
5. bandwidth-limited circuit according to claim 2, which is characterized in that the second filter circuit unit is active filter
Wave unit or passive filtering unit.
6. a kind of multiplexer, which is characterized in that including any one of at least one claim 1-4 bandwidth-limited circuits.
7. multiplexer according to claim 6, which is characterized in that the multiplexer further includes a first end and at least two
A second end；
The the first filter circuit unit and the second filter circuit unit of each bandwidth-limited circuit are connected in series in described more
Between the first end of work device and a second end.
8. multiplexer according to claim 7, which is characterized in that further include at least one third filter circuit unit；
The third filter unit is connected between the first end of the multiplexer and a second end.
9. multiplexer according to claim 7 or 8, which is characterized in that the first end and second end of the multiplexer is made
For input/output terminal.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820854823.4U CN207947757U (en) | 2018-06-04 | 2018-06-04 | Bandwidth-limited circuit and multiplexer |
| PCT/CN2018/109385 WO2019233002A1 (en) | 2018-06-04 | 2018-10-09 | Band-pass filtering circuit and multiplexer |
| US16/765,392 US20200343876A1 (en) | 2018-06-04 | 2018-10-09 | Band-pass filtering circuit and multiplexer |
| JP2020536788A JP2021508215A (en) | 2018-06-04 | 2018-10-09 | Bandband filter circuit and multiplexer |
| KR1020207011413A KR20200060429A (en) | 2018-06-04 | 2018-10-09 | Bandpass filtering circuit and multiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820854823.4U CN207947757U (en) | 2018-06-04 | 2018-06-04 | Bandwidth-limited circuit and multiplexer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207947757U true CN207947757U (en) | 2018-10-09 |
Family
ID=63696033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820854823.4U Active CN207947757U (en) | 2018-06-04 | 2018-06-04 | Bandwidth-limited circuit and multiplexer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207947757U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512526A (en) * | 2018-06-04 | 2018-09-07 | 安徽安努奇科技有限公司 | Bandwidth-limited circuit and multiplexer |
| CN109672421A (en) * | 2019-02-22 | 2019-04-23 | 安徽安努奇科技有限公司 | Filter circuit and multiplexer |
-
2018
- 2018-06-04 CN CN201820854823.4U patent/CN207947757U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512526A (en) * | 2018-06-04 | 2018-09-07 | 安徽安努奇科技有限公司 | Bandwidth-limited circuit and multiplexer |
| CN108512526B (en) * | 2018-06-04 | 2019-10-11 | 安徽安努奇科技有限公司 | Bandwidth-limited circuit and multiplexer |
| CN109672421A (en) * | 2019-02-22 | 2019-04-23 | 安徽安努奇科技有限公司 | Filter circuit and multiplexer |
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