CN209608623U - Filter circuit and multiplexer - Google Patents
Filter circuit and multiplexer Download PDFInfo
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- CN209608623U CN209608623U CN201920225156.8U CN201920225156U CN209608623U CN 209608623 U CN209608623 U CN 209608623U CN 201920225156 U CN201920225156 U CN 201920225156U CN 209608623 U CN209608623 U CN 209608623U
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Abstract
The utility model discloses a kind of filter circuit and multiplexer, and wherein filter circuit includes at least three resonant elements, and at least three resonant element is in turn, electrically connected on the signal path of the filter circuit；At least one first acoustic resonator, the both ends of at least one first acoustic resonator are electrically connected with two resonant elements respectively, and two resonant elements being electrically connected with first acoustic resonator are spaced a resonant element on the filter circuit signal path.Filter circuit and multiplexer provided by the embodiment of the utility model have high rejection characteristic.
Description
Technical field
The utility model embodiment is related to filtering technique more particularly to a kind of filter circuit and multiplexer.
Background technique
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.
As filter size increasingly minimizes, although traditional filter circuit has wide frequency band, but difficult to realize
High degree of suppression.
Utility model content
The utility model provides a kind of filter circuit and multiplexer, to improve the rejection characteristic of filter circuit and multiplexer.
On the one hand, the utility model embodiment provides a kind of filter circuit.The filter circuit includes:
At least three resonant elements, the signal that at least three resonant element is in turn, electrically connected to the filter circuit are logical
On the road；
At least one first acoustic resonator, the both ends of at least one first acoustic resonator are respectively and described in two
Resonant element electrical connection, two resonant elements being electrically connected with first acoustic resonator are in the filter circuit signal
A resonant element is spaced on access.
Optionally, the filter circuit include first capacitor, the second capacitor, the first resonant element, the second resonant element and
Third resonant element；
The first end of first resonant element is electrically connected with the first end of the filter circuit, first resonant element
Second end be electrically connected with the first end of first inductance, the second end of first inductance ground connection；
The first end of second resonant element is electrically connected by first capacitor with the first end of first resonant element,
The second end of second resonant element is electrically connected with the first end of first inductance；
The first end of the third resonant element is electrically connected by the second capacitor with the first end of second resonant element,
The first end of the third resonant element is electrically connected with the second end of the filter circuit, the second end of the third resonant element
It is electrically connected with the first end of first inductance；
The first end of first acoustic resonator is electrically connected with the first end of first resonant element, first sound
The second end of wave resonator is electrically connected with the first end of the third resonant element.
Optionally, first resonant element includes third capacitor and the second inductance, the first end of the third capacitor and
Second end is electrically connected with the first end and second end of first resonant element respectively, second inductance and the third capacitor
It is in parallel；
Second resonant element includes the 4th capacitor and third inductance, the first end and second end point of the 4th capacitor
It is not electrically connected with the first end and second end of second resonant element, the third inductance is in parallel with the 4th capacitor；
The third resonant element includes the 5th capacitor and the 4th inductance, the first end and second end point of the 5th capacitor
It is not electrically connected with the first end and second end of the third resonant element, the 4th inductance is in parallel with the 5th capacitor.
On the other hand, the utility model embodiment additionally provides a kind of filter circuit, which includes:
At least one second acoustic resonator；
Second acoustic resonator is connected with the 5th inductance, concatenated second acoustic resonator and the 5th electricity
Sense is set in the 4th resonant element of the filter circuit, the 4th resonant element and the filter circuit first end and the
Route electrical connection between two ends, the 4th resonant element are configured at the sideband for inhibiting signal.
Optionally, the 4th resonant element includes first end and second end, second acoustic resonator and described
Five inductance are series at the first end and second end of the 4th resonant element；The first end and the filter of 4th resonant element
Connection between the first end and second end of wave circuit, the second end ground connection of the 4th resonant element.
Optionally, the filter circuit include the 6th inductance, the 7th inductance, the 8th inductance, the 6th capacitor, the 7th capacitor,
8th capacitor, the 5th resonant element and the 6th resonant element；
The first end of 6th inductance is electrically connected with the first end of the filter circuit, the second end of the 6th inductance
It is grounded by the 7th inductance；
6th capacitor and the 6th inductance in parallel；
The first end of 7th capacitor is electrically connected with the first end of the 6th inductance, the second end of the 7th capacitor
It is electrically connected with the first end of the 8th capacitor, the second end of the 8th capacitor and the first end of the 8th inductance are electrically connected
It connects, the second end of the 8th inductance is electrically connected with the second end of the filter circuit；
The first end of 4th resonant element is electrically connected with the second end of the filter circuit, the 4th resonant element
Second end ground connection；The first end of 5th resonant element is electrically connected with the second end of the 7th capacitor, and the described 5th is humorous
The second end ground connection of vibration unit；The first end of 6th resonant element is electrically connected with the second end of the 8th capacitor, described
The second end of 6th resonant element is grounded.
Optionally, the 5th resonant element includes the 9th capacitor and the 9th electricity for being series at its first end and second end
Sense；The 6th resonant element electricity includes the tenth capacitor and the tenth inductance for being series at its first end and second end.
Optionally, the number of the acoustic resonator is more than or equal to 2, and each acoustic resonator is integrated in a chip
On.
On the other hand, the utility model embodiment additionally provides a kind of multiplexer, which includes at least one this reality
The filter circuit described in novel any embodiment.
Optionally, the multiplexer further includes a first end and at least two second ends；
The first end of each filter circuit is connect with the first end of the multiplexer, and the of each filter circuit
Two ends are connect with a second end of the multiplexer.
Optionally, the first end and second end of the multiplexer is used as input/output terminal.
Filter circuit and multiplexer provided by the utility model, acoustic resonator is in addition to that can provide required filter circuit institute
The capacitance needed, moreover it is possible to generate resonance, so that the Out-of-band rejection of entire filter circuit gets a promotion, the utility model embodiment is mentioned
The filter circuit of confession has the wide and high rejection characteristic of wideband.
Detailed description of the invention
Fig. 1 is a kind of equivalent circuit of acoustic resonator provided by the embodiment of the utility model；
Fig. 2 is the circuit diagram that the utility model implements a kind of filter circuit provided；
Fig. 3 is the circuit diagram that the utility model implements another filter circuit provided；
Fig. 4 is the S parameter analogous diagram provided by the embodiment of the utility model for circuit shown in Fig. 3；
Fig. 5 is the S provided by the embodiment of the utility model that capacitor is replaced with for acoustic resonator in circuit shown in Fig. 3
Parameters simulation figure；
Fig. 6 is the circuit diagram that the utility model implements another filter circuit provided；
Fig. 7 is the circuit diagram that the utility model implements another filter circuit provided；
Fig. 8 is the S parameter analogous diagram provided by the embodiment of the utility model for circuit shown in Fig. 7；
Fig. 9 is the S provided by the embodiment of the utility model that capacitor is replaced with for acoustic resonator in circuit shown in Fig. 7
Parameters simulation figure；
Figure 10 is a kind of circuit diagram of multiplexer provided by the embodiment of the utility model.
Specific embodiment
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, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
The utility model embodiment provides a kind of filter circuit, which includes:
At least three resonant elements, at least three resonant elements are in turn, electrically connected on the signal path of filter circuit；
At least one first acoustic resonator, the both ends of at least one the first acoustic resonator respectively with two resonant elements
Electrical connection, two resonant elements being electrically connected with the first acoustic resonator are spaced a resonance list on filter circuit signal path
Member.
Conventional filter circuit generally has several lamped elements, such as is made of capacitor, inductance and resistance, the filter of composition
Wave circuit bandwidth is relatively wide, however the rejection characteristic of filter circuit is poor.Or filter circuit uses several sound wave resonances
The rejection characteristic of device, filter circuit is improved, but the bandwidth of filter circuit is relatively narrow.Utility model people sends out in research process
It is existing, in filter circuit, between the first end and second end of at least one the first acoustic resonator respectively with two resonant elements
Electrical connection, and the two resonant elements are set on the signal path of filter circuit, are also set up between the two resonant elements
There is another to be connected to the resonant element on signal path；In other words, as long as being successively electrically connected on the signal path of filter circuit
It is connected to first resonant element, second resonant element and third resonant element, first resonant element and third resonance
The first acoustic resonator is electrically connected between unit, which there can be higher rejection characteristic.Fig. 1 is the utility model reality
A kind of equivalent circuit of acoustic resonator of example offer is provided.Referring to FIG. 1, the equivalent circuit of the first acoustic resonator includes inductance
Capacitor C11, capacitor C12, inductance L11 and resistance R11, A1 and B1 are respectively the first end and second end of the first acoustic resonator.
From the equivalent circuit of the first acoustic resonator it is recognised that the first acoustic resonator is in addition to that can provide needed for required filter circuit
Capacitance (mainly have capacitor C12 offer), moreover it is possible to generate resonance (capacitor C11 and inductance L11 generate resonance), the filter circuit
Out-of-band rejection get a promotion, therefore, filter circuit provided by the embodiment of the utility model have the wide and high rejection characteristic of wideband.
Illustratively, Fig. 2 is the circuit diagram of three kinds of filter circuits provided by the embodiment of the utility model, with reference to Fig. 2, the filter
Wave circuit includes first capacitor C1, the second capacitor C2, the first resonant element 101, the second resonant element 102 and third resonant element
103；
The first end O1 of first resonant element 101 is electrically connected with the first end A of filter circuit, the first resonant element 101
Second end is electrically connected with the first end of the first inductance L1, the second end ground connection of the first inductance L1；
The first end O1 electricity that the first end O2 of second resonant element 102 passes through first capacitor C1 and the first resonant element 101
Connection, the second end of the second resonant element 102 are electrically connected with the first end of the first inductance L1；
The first end O2 electricity that the first end O3 of third resonant element 103 passes through the second capacitor C2 and the second resonant element 102
Connection, the first end of third resonant element 103 are electrically connected with the second end B of filter circuit, the second end of third resonant element 103
It is electrically connected with the first end of the first inductance L1；
The first end of first acoustic resonator 11 is electrically connected with the first end of the first resonant element 101, the first sound wave resonance
The second end of device 11 is electrically connected with the first end of third resonant element 103.
First resonant element 101, the second resonant element 102 and third resonant element 103 can be by single circuit elements
Part or at least two circuit elements are constituted, such as are made of capacitor, inductance or resistance, or by capacitor, inductance and resistance
At least two series-parallel combination is constituted.The first end A of filter circuit can be used as input, output end or both as input
End is used as output end again；The second end B of filter circuit can be used as input, output end or not only as input terminal but also as defeated
Outlet.The utility model embodiment is not construed as limiting, and can configure port according to specific use demand in actual circuit.First
Resonant element 101, the second resonant element 102 and third resonant element 103 are in turn, electrically connected on the signal path of filter circuit,
The signal path that the signal path of filter circuit is formed between the first end A and second end of filter circuit, along filter circuit
Signal path is spaced the second resonant element 102, and the first resonance between the first resonant element 101 and third resonant element 102
Unit 101 and third resonant element 102 are electrically connected by the first acoustic resonator 11, which has high rejection characteristic.
Fig. 3 is the circuit diagram of another filter circuit provided by the embodiment of the utility model.Referring to FIG. 3, in above-mentioned reality
On the basis of applying example, the first resonant element includes third capacitor C3 and the second inductance L2, the first end and second of third capacitor C3
End is electrically connected with the first end and second end of the first resonant element respectively, and the second inductance L2 is in parallel with third capacitor C3；
Second resonant element includes the first end and second end difference of the 4th capacitor C4 and third inductance L3, the 4th capacitor C4
It is electrically connected with the first end and second end of the second resonant element, third inductance L3 is in parallel with the 4th capacitor C4；
Third resonant element includes the 5th capacitor C5 and the 4th inductance L4, and the first end and second end of the 5th capacitor C5 is distinguished
It is electrically connected with the first end and second end of third resonant element, the 4th inductance L4 is in parallel with the 5th capacitor C5.
Fig. 4 is the S parameter analogous diagram provided by the embodiment of the utility model for circuit shown in Fig. 3, referring to FIG. 4,
The unit of abscissa is GHz, and the unit of ordinate is dB, and t1 indicates the band connection frequency of the filter circuit.T2 indicates the filtered electrical
The intermediate zone bandwidth on road, intermediate zone bandwidth are about 135MHz (2.94GHz-3.075GHz), and width very little shows Fig. 3 institute
The circuit shown has high rejection characteristic.Fig. 5 is the S that capacitor is replaced with for the first acoustic wave filter 11 in the circuit in Fig. 3
Parameters simulation figure.Referring to FIG. 5, t3 indicates that the band connection frequency of the filter circuit, t4 indicate the intermediate zone bandwidth of the filter circuit,
Intermediate zone bandwidth is about 455MHz (2.72GHz-3.175GHz).Filtering provided by the embodiment of the utility model can be seen
Circuit, intermediate zone bandwidth is significantly smaller, has high rejection characteristic.
The utility model embodiment additionally provides another filter circuit, which includes:
At least one second acoustic resonator；
Second acoustic resonator is connected with the 5th inductance, and concatenated second acoustic resonator and the 5th inductance are set to filtering
In 4th resonant element of circuit, the 4th resonant element is electrically connected with the route between filter circuit first end and second end, the
Four resonant elements are configured at the sideband for inhibiting signal.
In filter circuit provided by the embodiment of the utility model, the second acoustic resonator is connected with the 5th inductance, series connection
The second acoustic resonator and the 5th inductance be set in the 4th resonant element of filter circuit, the 4th resonant element and filtered electrical
Route electrical connection between the first end and second end of road.Resonant element in existing filter circuit generally has inductance and capacitor structure
At can produce resonance.For example, the second sound wave resonance can be replaced with the capacitor in the resonant element in existing filter circuit
Device continues to refer to figure 1, and the second acoustic resonator is in addition to capacitance (capacitor C11 and C12) needed for capable of providing filter circuit, and
Capacitor (capacitor C11 and C12) in two acoustic resonator equivalent circuits can generate resonance with the inductance in resonant element, and
And second can also generate resonance in acoustic resonator, such as have capacitor C11 and inductance L11 to generate, so that filter circuit
Out-of-band rejection gets a promotion, and filter circuit has more transmission zeros, therefore, filter provided by the embodiment of the utility model
Wave circuit has the wide and high rejection characteristic of wideband.
Wherein, the number of acoustic resonator can be matched according to actual circuit in filter circuit, and in general, sound wave is humorous
The number of vibration device is more, and the rejection characteristic of filter circuit is better.
In the utility model embodiment, be arbitrarily able to suppress the sideband of signal resonant element can be used it is concatenated
Acoustic resonator and inductance, optionally, the 4th resonant element includes first end and second end, the second acoustic resonator and the 5th electricity
Sense is series at the first end and second end of resonant element；The first end of 4th resonant element and the first end and second of filter circuit
Connection between end, the second end ground connection of the 4th resonant element.
Illustratively, Fig. 6 is the circuit diagram that the utility model implements another filter circuit provided.Referring to FIG. 6, should
Filter circuit includes the 6th inductance L6, the 7th inductance L7, the 8th inductance L8, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor
C8, the 5th resonant element 105 and the 6th resonant element 106；
The first end of 6th inductance L6 is electrically connected with the first end A of filter circuit, and the second end of the 6th inductance L6 passes through the
Seven inductance L7 ground connection；
6th capacitor C6 is in parallel with the 6th inductance L6；
The first end of 7th capacitor C7 is electrically connected with the first end of the 6th inductance L6, the second end and the 8th of the 7th capacitor C7
The first end of capacitor C8 is electrically connected, and the second end of the 8th capacitor C8 is electrically connected with the first end of the 8th inductance L8, the 8th inductance L8
Second end be electrically connected with the second end B of filter circuit；
The first end of 4th resonant element 104 is electrically connected with the second end B of filter circuit, and the of the 4th resonant element 104
Two ends ground connection；The first end of 5th resonant element 105 is electrically connected with the second end of the 7th capacitor C7, the 5th resonant element 105
Second end ground connection；The first end of 6th resonant element 106 is electrically connected with the second end of the 8th capacitor C8, the 6th resonant element 106
Second end ground connection.
The second acoustic resonator 12 in the 4th resonant element 104 with Out-of-band rejection function is in addition to that can provide filtered electrical
Capacitance needed for road, the capacitor in 12 equivalent circuit of the second acoustic resonator can generate resonance with the 5th inductance L5, and
And second acoustic resonator 12 itself can also generate resonance so that the Out-of-band rejection of filter circuit gets a promotion, moreover, by
Additional resonance effect can be provided in the second acoustic wave filter 12, so that filter circuit has more transmission zeros.
Fig. 7 is the circuit diagram of another filter circuit provided by the embodiment of the utility model, referring to FIG. 7, the filtered electrical
On the basis of the filter circuit shown in Fig. 6 of road, the 5th resonant element includes the 9th capacitor for being series at its first end and second end
C9 and the 9th inductance L9；6th resonant element electricity includes the electricity of the tenth capacitor C10 and the tenth for being series at its first end and second end
Feel L10.
Fig. 8 is the S parameter analogous diagram provided by the embodiment of the utility model for circuit shown in Fig. 7, referring to FIG. 8,
The unit of abscissa is GHz, and the unit of ordinate is dB, and t5 indicates the band connection frequency of the filter circuit.T6 indicates the filtered electrical
The intermediate zone bandwidth on road, intermediate zone bandwidth are about 540MHz (4.2GHz-4.74GHz), and width very little shows shown in Fig. 7
Circuit have high rejection characteristic.Fig. 9 is the S ginseng that capacitor is replaced with for the second acoustic wave filter 12 in the circuit in Fig. 7
Number analogous diagram.Referring to FIG. 9, t7 indicates that the band connection frequency of the filter circuit, t8 indicate the intermediate zone bandwidth of the filter circuit, mistake
It crosses band bandwidth and is about 850MHz (4.2GHz-5.05GHz).Filtered electrical provided by the embodiment of the utility model can be seen
Road, intermediate zone bandwidth is significantly smaller, which has high inhibit.
Show an acoustic resonator, this field skill to the exemplary property of filter circuit provided by the embodiment of the utility model
Art personnel are appreciated that filter circuit provided by the embodiment of the utility model may include at least two acoustic resonators.It is optional
Ground, when the number of acoustic resonator is more than or equal to 2, each acoustic resonator can be integrated on a single die, can reduce filtered electrical
The volume on road, reduces cost.
Optionally, the number of acoustic resonator is 1 or 2.Filter circuit provided by the embodiment of the utility model, sound wave
The number of resonator is 1 or 2 characteristic that can not only make filter circuit have wide, the high inhibition of wideband, and is had more
The overall volume of transmission zero, filter circuit is smaller, at low cost.
In filter circuit provided by the embodiment of the utility model, the first acoustic resonator 11 and the second acoustic resonator 12 can
With but be not limited to surface acoustic wave (Surface Acoustic Wave, SAW), bulk acoustic wave (Bulk Acoustic Wave, BAW),
Thin film bulk acoustic wave resonator (Film Bulk Acoustic Resonator, FBAR) is realized.
It may include several lumped circuit elements, such as capacitor, inductance and resistance in filter circuit, such as with reference to Fig. 6, this
A little circuit elements can be, but not limited to integrated passive devices (Integrated Passive Devices, IPD), low temperature co-fired
Ceramics (Low Temperature Co-fired Ceramic, LTCC), surface mounting technology (Surface Mount
Devices, SMD) it realizes.
The utility model embodiment additionally provides a kind of multiplexer, referring to FIG. 10, the multiplexer includes at least one sheet
The filter circuit that utility model any embodiment provides, the filter circuit indicate that the multiplexer also wraps with the first filter circuit 10
Include a first end and at least two second ends；Such as include a first end IN, n second end, respectively OUT1,
OUT2、……、OUTn。
The first end of each first filter circuit 10 and the first end of multiplexer connect, the second end and multiplexing of filter circuit
One second end of device connects.Such as first the first filter circuit 10 first end and multiplexer first end IN connection, first
The second end of a first filter circuit 10 is connect with a second end OUT1.Make between the first end of multiplexer and at least a second end
With the filter circuit for having the utility model any embodiment to provide, which has high inhibit and the wide characteristic of wideband, multiplexing
Device may include multiple second ends, and filter provided by the embodiment of the utility model is used between the first end of multiplexer and each second end
Use filter circuit shown in Fig. 3 between the combination of wave circuit, such as the first end and a second end of multiplexer, the of multiplexer
Filter circuit shown in Fig. 7 is used between one end and another second end.The first end and second end of multiplexer is defeated as inputting
Outlet.That is, multiplexer be usually it is two-way, first end and second end can input signal, can also be with output signal.
Optionally, 0 is continued to refer to figure 1, multiplexer provided by the embodiment of the utility model further includes at least one second filter
Wave circuit 20；Second filter circuit 20 is connected between the first end of multiplexer and a second end.That is, practical new at this
It also may include other types in addition to having used filter circuit provided by the utility model in the multiplexer that type embodiment provides
Filter circuit unit, the second filter circuit 20 can be low-pass filter circuit unit, high-pass filtering circuit unit or band logical
Filter 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, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of filter circuit characterized by comprising
At least three resonant elements, at least three resonant element are in turn, electrically connected to the signal path of the filter circuit
On；
At least one first acoustic resonator, the both ends of at least one first acoustic resonator respectively with two resonance
Unit electrical connection, two resonant elements being electrically connected with first acoustic resonator are in the filter circuit signal path
One resonant element of upper interval.
2. filter circuit according to claim 1, which is characterized in that the filter circuit includes the first inductance, the first electricity
Appearance, the second capacitor, the first resonant element, the second resonant element and third resonant element；
The first end of first resonant element is electrically connected with the first end of the filter circuit, and the of first resonant element
Two ends are electrically connected with the first end of first inductance, the second end ground connection of first inductance；
The first end of second resonant element is electrically connected by first capacitor with the first end of first resonant element, described
The second end of second resonant element is electrically connected with the first end of first inductance；
The first end of the third resonant element is electrically connected by the second capacitor with the first end of second resonant element, described
The first end of third resonant element is electrically connected with the second end of the filter circuit, the second end of the third resonant element and institute
State the first end electrical connection of the first inductance；
The first end of first acoustic resonator is electrically connected with the first end of first resonant element, and first sound wave is humorous
The second end of vibration device is electrically connected with the first end of the third resonant element.
3. filter circuit according to claim 2, which is characterized in that first resonant element includes third capacitor and
Two inductance, first end and second end of the first end and second end of the third capacitor respectively with first resonant element are electrically connected
It connects, second inductance is in parallel with the third capacitor；
Second resonant element include the 4th capacitor and third inductance, the first end and second end of the 4th capacitor respectively with
The first end and second end of second resonant element is electrically connected, and the third inductance is in parallel with the 4th capacitor；
The third resonant element include the 5th capacitor and the 4th inductance, the first end and second end of the 5th capacitor respectively with
The first end and second end of the third resonant element is electrically connected, and the 4th inductance is in parallel with the 5th capacitor.
4. filter circuit according to claim 1, which is characterized in that the number of first acoustic resonator is more than or equal to
2, each first acoustic resonator is integrated on a single die.
5. a kind of filter circuit characterized by comprising
At least one second acoustic resonator；
Second acoustic resonator is connected with the 5th inductance, and concatenated second acoustic resonator and the 5th inductance are set
It is placed in the 4th resonant element of the filter circuit, the 4th resonant element and the filter circuit first end and second end
Between route electrical connection, the 4th resonant element be configured at inhibit signal sideband.
6. filter circuit according to claim 5, which is characterized in that
4th resonant element includes first end and second end, and second acoustic resonator and the 5th inductance are series at
The first end and second end of 4th resonant element；The first end of 4th resonant element and the first of the filter circuit
Connection between end and second end, the second end ground connection of the 4th resonant element.
7. filter circuit according to claim 5, which is characterized in that the filter circuit includes the 6th inductance, the 7th electricity
Sense, the 8th inductance, the 6th capacitor, the 7th capacitor, the 8th capacitor, the 5th resonant element and the 6th resonant element；
The first end of 6th inductance is electrically connected with the first end of the filter circuit, and the second end of the 6th inductance passes through
The 7th inductance ground connection；
6th capacitor and the 6th inductance in parallel；
The first end of 7th capacitor is electrically connected with the first end of the 6th inductance, the second end of the 7th capacitor and institute
The first end electrical connection of the 8th capacitor is stated, the second end of the 8th capacitor is electrically connected with the first end of the 8th inductance, institute
The second end for stating the 8th inductance is electrically connected with the second end of the filter circuit；
The first end of 4th resonant element is electrically connected with the second end of the filter circuit, and the of the 4th resonant element
Two ends ground connection；The first end of 5th resonant element is electrically connected with the second end of the 7th capacitor, the 5th resonance list
The second end ground connection of member；The first end of 6th resonant element is electrically connected with the second end of the 8th capacitor, and the described 6th
The second end of resonant element is grounded.
8. filter circuit according to claim 7, which is characterized in that the 5th resonant element include be series at its first
9th capacitor and the 9th inductance at end and second end；The 6th resonant element electricity includes being series at its first end and second end
Tenth capacitor and the tenth inductance.
9. a kind of multiplexer, which is characterized in that including any one of at least one claim 1-8 filter circuit.
10. multiplexer according to claim 9, which is characterized in that the multiplexer further includes first end and at least
Two second ends；
The first end of each filter circuit is connect with the first end of the multiplexer, the second end of each filter circuit
It is connect with a second end of the multiplexer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920225156.8U CN209608623U (en) | 2019-02-22 | 2019-02-22 | Filter circuit and multiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920225156.8U CN209608623U (en) | 2019-02-22 | 2019-02-22 | Filter circuit and multiplexer |
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|---|---|
| CN209608623U true CN209608623U (en) | 2019-11-08 |
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| CN201920225156.8U Active CN209608623U (en) | 2019-02-22 | 2019-02-22 | Filter circuit and multiplexer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11309865B1 (en) * | 2020-10-05 | 2022-04-19 | Resonant Inc. | Acoustic matrix diplexers and radios using acoustic matrix diplexers |
| US11658639B2 (en) | 2020-10-05 | 2023-05-23 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with noncontiguous passband |
| US11728784B2 (en) | 2020-10-05 | 2023-08-15 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with split die sub-filters |
| US11811377B2 (en) | 2020-10-05 | 2023-11-07 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters |
| US11929733B2 (en) | 2020-10-05 | 2024-03-12 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with input and output impedances matched to radio frequency front end elements |
| US11955951B2 (en) | 2020-10-05 | 2024-04-09 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with switches in parallel with sub-filter shunt capacitors |
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2019
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| US11405017B2 (en) * | 2020-10-05 | 2022-08-02 | Resonant Inc. | Acoustic matrix filters and radios using acoustic matrix filters |
| US20220286109A1 (en) * | 2020-10-05 | 2022-09-08 | Resonant Inc. | Acoustic matrix filters and radios using acoustic matrix filters |
| US11658639B2 (en) | 2020-10-05 | 2023-05-23 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with noncontiguous passband |
| US11728784B2 (en) | 2020-10-05 | 2023-08-15 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with split die sub-filters |
| US11811377B2 (en) | 2020-10-05 | 2023-11-07 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters |
| US11863160B2 (en) | 2020-10-05 | 2024-01-02 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with split die sub-filters |
| US11870420B2 (en) | 2020-10-05 | 2024-01-09 | Murata Manufacturing Co., Ltd. | Acoustic matrix diplexers and radios using acoustic matrix diplexers |
| US11901876B2 (en) * | 2020-10-05 | 2024-02-13 | Murata Manufacturing Co., Ltd. | Acoustic matrix filters and radios using acoustic matrix filters |
| US11901877B2 (en) | 2020-10-05 | 2024-02-13 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with noncontiguous passband |
| US11929733B2 (en) | 2020-10-05 | 2024-03-12 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with input and output impedances matched to radio frequency front end elements |
| US11955951B2 (en) | 2020-10-05 | 2024-04-09 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with switches in parallel with sub-filter shunt capacitors |
| US11973489B2 (en) | 2020-10-05 | 2024-04-30 | Murata Manufacturing Co., Ltd. | Transversely-excited film bulk acoustic resonator matrix filters with split die sub-filters |
| US11984873B2 (en) | 2020-10-05 | 2024-05-14 | Murata Manufacturing Co., Ltd. | Acoustic matrix diplexers and radios using acoustic matrix diplexers |
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