CN109510604A - A kind of filter circuit applied to radio-frequency front-end - Google Patents
A kind of filter circuit applied to radio-frequency front-end Download PDFInfo
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- CN109510604A CN109510604A CN201811348670.7A CN201811348670A CN109510604A CN 109510604 A CN109510604 A CN 109510604A CN 201811348670 A CN201811348670 A CN 201811348670A CN 109510604 A CN109510604 A CN 109510604A
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- filter circuit
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- 239000003990 capacitor Substances 0.000 claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 claims description 37
- 238000005516 engineering process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H5/00—One-port networks comprising only passive electrical elements as network components
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- Filters And Equalizers (AREA)
Abstract
The present invention provides a kind of filter circuit applied to radio-frequency front-end, comprising: first capacitor, the second capacitor, third capacitor, the first inductance, the second inductance and third inductance.Wherein, first capacitor and the first inductance connection form series arm, and series arm and the second capacitor form the first parallel branch, input terminal of the input terminal of the first parallel branch as filter circuit, and output end is grounded by the second inductance.Third capacitor and third inductance form the second parallel branch, and the input terminal of the second parallel branch connects the input terminal of the first parallel branch, output end of the output end as filter circuit.
Description
Technical field
The present invention relates to communication technique fields, more specifically to a kind of filter circuit applied to radio-frequency front-end.
Background technique
Radio-frequency front-end is in the signal processing section in communication system between antenna and baseband circuit, with high-frequency alternating current
Form carry out transmission signal.Radio-frequency front-end includes transmitting path and receiving path.Wherein, receiving path mainly includes low noise
The devices such as amplifier, filter, to ensure that useful radiofrequency signal completely can be picked up and be conveyed from antenna without distortion
To the processing circuit of rear class.Filter plays the effect for eliminating jamming incoherent signal in radio-frequency front-end, allows within the scope of certain frequency
Signal pass through, stop or working frequency range of decaying other than wave, thus realize the wave other than working frequency range is effectively filtered
It removes.As the application of radio-frequency front-end technology is increasing.Correspondingly, it is also presented fastly applied to the dosage of the filter of radio-frequency front-end
Speed increases.Wherein, acoustic filter is more prominent.
Acoustic filter is using the inverse piezoelectric material of piezoelectricity-, and the transfer principle based on acoustoelectric signal may be implemented to inhibit more
The interference of a frequency point, but thus increase production cost, and put forward higher requirements to encapsulation technology, while limitation and low noise
Acoustic amplifier carries out Integrated design.
Therefore, in the case where guaranteeing that cost and encapsulation technology require, the filter applied to radio-frequency front-end how is realized
The interference for inhibiting multiple frequency points becomes those skilled in the art's problem to be solved.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of filter circuit applied to radio-frequency front-end, with realize guarantee at
Inhibit the interference of multiple frequency points under the requirement of this and encapsulation technology.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of filter circuit applied to radio-frequency front-end, comprising: first capacitor, the second capacitor, third capacitor, the first electricity
Sense, the second inductance and third inductance.Wherein,
The first capacitor and first inductance connection form series arm, the series arm and second capacitor
The first parallel branch, input terminal of the input terminal of first parallel branch as the filter circuit are formed, output end leads to
Cross the second inductance ground connection.The third capacitor and the third inductance form the second parallel branch, the described second branch in parallel
The input terminal on road connects the input terminal of first parallel branch, output end of the output end as the filter circuit.
Optionally, the manufacturing process of the filter circuit requires component using integrated distribution.
Optionally, the manufacturing process of the filter circuit includes low-temperature co-fired ceramics technique (Low Temperature
Co-fired Ceramic, LTCC).
Optionally, the manufacturing process of the filter circuit includes integrated passive devices technique (Integrated
Passive Device, IPD).
Optionally, the manufacturing process of the filter circuit includes laminated substrate manufacturing process.
Optionally, the manufacturing process of the filter circuit requires component that can be distributed using patch.
Optionally, the manufacturing process of the filter circuit includes the manufacturing process of discrete device patch.
Optionally, the manufacturing process of the filter circuit can be with CMOS technology
(ComplementaryMetal Oxide Semiconductor, CMOS) is compatible.
In filter circuit provided by the invention applied to radio-frequency front-end, using two kinds of capacitor and inductance less first devices
Part, control product cost, ensure that it is higher can encapsulation.Also, by first capacitor and the composition series connection of the first inductance connection
Branch, the series arm form the first parallel branch with the second capacitor again.Third capacitor and the branch in parallel of third inductance composition second
Road realizes the interference for inhibiting multiple frequency points, finally can be realized and inhibits multiple frequencies under the requirement for guaranteeing cost and encapsulation technology
The interference of point.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structure diagram that the embodiment of the present invention discloses a kind of filter circuit applied to radio-frequency front-end；
Fig. 2 is a kind of frequency for the first parallel branch that the embodiment of the present invention discloses filter circuit applied to radio-frequency front-end
Ring performance plot；
Fig. 3 is that the embodiment of the present invention discloses the first parallel branch of a kind of filter circuit applied to radio-frequency front-end and the
The Frequency Response figure of two inductance；
Fig. 4 is a kind of frequency for the second parallel branch that the embodiment of the present invention discloses filter circuit applied to radio-frequency front-end
Ring performance plot；
Fig. 5 is the Frequency Response figure that the embodiment of the present invention discloses a kind of filter circuit applied to radio-frequency front-end.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of filter circuit applied to radio-frequency front-end, guarantees cost and encapsulation skill to realize
Inhibit the interference of multiple frequency points under the requirement of art.
Referring to Fig. 1, the filter circuit disclosed by the embodiments of the present invention applied to radio-frequency front-end, comprising:
First capacitor C1, the second capacitor C2, third capacitor C3, the first inductance L1, the second inductance L2 and third inductance L3.Its
In,
First capacitor C1 connect composition series arm with the first inductance L1, and series arm and the second capacitor C2 composition first are simultaneously
Join branch, input terminal of the input terminal of the first parallel branch as filter circuit, output end is grounded by the second inductance L2.The
Three capacitor C3 and third inductance L3 form the second parallel branch, and the input terminal of the second parallel branch connects the defeated of the first parallel branch
Enter end, output end of the output end as filter circuit.
Referring to Fig. 2, first capacitor C1 and the first inductance L1 resonance are in frequency point f1, it is in low-resistance band-stop response, the frequency point
Signal is filtered, and the signal of other frequency points can pass through, and realizes the filtering of the interference signal of first frequency point.Passband width and
It is related to the first inductance L1 quality factor with interior degree of suppression.
Also, see also Fig. 2, the series arm of first capacitor C1 and the first inductance L1 are in parallel humorous with the second capacitor C2
Vibration is in high resistant bandpass characteristics in frequency point f2, and the signal of the frequency point can pass through.
First parallel branch is in capacitance characteristic, equivalent capacitance value Cp ', Cp ' and the second inductance L2 in the frequency point higher than f2
Resonance is in frequency point f4, as shown in Figure 3.It is in low-resistance band-stop response in frequency point f4, the signal of the frequency point is filtered, the letter of other frequency points
It number can pass through, realize the filtering of the interference signal of second frequency point.Resistance band and with interior degree of suppression and the second inductance L2,
First inductance L1 quality factor are related.
As shown in figure 4, third capacitor C3, third inductance L3 and low-noise amplifier input capacitance common resonance are in frequency point
F3 is in high resistant band-stop response, and the signal of the frequency point is filtered, and the signal of other frequency points can pass through, and realize third frequency point
Interference signal filtering.It is special to be matched to system work by the frequency point other than f3 frequency point for the characteristic impedance of low-noise amplifier
Impedance is levied, is realized with interior matching and Out-of-band rejection.The resistance band of second parallel branch, with interior degree of suppression and third inductance L3
Inductance quality factor are related.
In filter circuit provided by the invention applied to radio-frequency front-end, using two kinds of capacitor and inductance less first devices
Part, control product cost, ensure that it is higher can encapsulation.Also, by first capacitor and the composition series connection of the first inductance connection
Branch, the series arm form the first parallel branch with the second capacitor again.Third capacitor and the branch in parallel of third inductance composition second
Road realizes the interference for inhibiting multiple frequency points, finally can be realized and inhibits multiple frequencies under the requirement for guaranteeing cost and encapsulation technology
The interference of point.
It should be noted that referring to Fig. 5, the filter circuit provided by the invention applied to radio-frequency front-end can inhibit
The interference of tri- frequency points of f1, f3 and f4 allows the signal near f2 frequency point that can pass through.Frequency range is filter near f2 frequency point
The working frequency range of circuit.At f2 frequency point in working frequency range, the Frequency Response of filter circuit reaches peak value, represents power increasing
It is beneficial maximum.F1, f3, f4 frequency point are Frequency Response low spot, represent power inhibition point.In addition, filter itself is in all frequency ranges
Function without signal amplification, so that entire Frequency Response below X-axis, indicates that Frequency Response is negative.
Optionally, in another embodiment of the application, the manufacturing process of filter circuit of the invention requires component to adopt
It is distributed on manufacture carrier with integrated to realize filter circuit.The coiling inductance on manufacture carrier and arrangement capacitor can be passed through
Assemble a filter circuit.
Optionally, in another embodiment of the application, the manufacturing process of filter circuit of the invention includes LTCC.LTCC
Manufacture carrier can be achieved and carry inductance and capacitor.
Optionally, in another embodiment of the application, the manufacturing process of filter circuit of the invention includes IPD.IPD is
Wire-wound inductor and setting capacitor are on high resistant silicon crystal unit to realize filter circuit.Wire-wound inductor to filter on high resistant silicon crystal unit
Device circuit inductance quality factor with higher can adjust the resistance band of filter circuit and with interior degree of suppression accordingly.It is logical
Distributed inductance and capacitor are confined on the silicon crystal unit of normal IPD.
Optionally, in another embodiment of the application, the manufacturing process of filter circuit of the invention includes laminated substrate
Manufacturing process.Laminated substrate manufacturing process can realize that manufacture carrier carries inductance and capacitor.
Optionally, in another embodiment of the application, the manufacturing process of filter circuit of the invention requires component to adopt
The mode of surface patch realizes the effect of removal of impurities filtering in application scenarios circuit.
Optionally, in another embodiment of the application, the manufacturing process of filter circuit of the invention includes discrete device
The manufacturing process of patch.
Optionally, in another embodiment of the application, the manufacturing process of filter circuit of the invention is compatible with CMOS.Its
In, the manufacturing process with cmos compatible filter circuit includes LTCC, IPD, laminated substrate manufacturing process.Based on filter electricity
The manufacturing process on road is compatible with CMOS's, and the application circuit of filter circuit and CMOS can use identical manufacture carrier, from
And the integrated level of the two is promoted, in order to which the progress of the application circuit of filter circuit and CMOS is integrally disposed.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of filter circuit applied to radio-frequency front-end characterized by comprising first capacitor, the second capacitor, third electricity
Appearance, the first inductance, the second inductance and third inductance；Wherein,
The first capacitor and first inductance connection form series arm, and the series arm and second capacitor form
First parallel branch, input terminal of the input terminal of first parallel branch as the filter circuit, output end pass through institute
State the second inductance ground connection；The third capacitor and the third inductance form the second parallel branch, second parallel branch
Input terminal connects the input terminal of first parallel branch, output end of the output end as the filter circuit.
2. being applied to the filter circuit of radio-frequency front-end as described in claim 1, which is characterized in that the filter circuit
Manufacturing process requires component using integrated distribution.
3. being applied to the filter circuit of radio-frequency front-end as claimed in claim 2, which is characterized in that the filter circuit
Manufacturing process includes low-temperature co-fired ceramics technique LTCC.
4. being applied to the filter circuit of radio-frequency front-end as claimed in claim 2, which is characterized in that the filter circuit
Manufacturing process includes integrated passive devices technique IPD.
5. being applied to the filter circuit of radio-frequency front-end as claimed in claim 2, which is characterized in that the filter circuit
Manufacturing process includes laminated substrate manufacturing process.
6. being applied to the filter circuit of radio-frequency front-end as described in claim 1, which is characterized in that described applied to before radio frequency
The manufacturing process of the filter circuit at end requires component that can be distributed using patch.
7. being applied to the filter circuit of radio-frequency front-end as claimed in claim 6, which is characterized in that the filter circuit
Manufacturing process includes the manufacturing process of discrete device patch.
8. such as the filter circuit described in any one of claim 1 to 5 applied to radio-frequency front-end, which is characterized in that the filter
The manufacturing process of wave device circuit can be compatible with CMOS technology CMOS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811348670.7A CN109510604B (en) | 2018-11-13 | 2018-11-13 | Filter circuit applied to radio frequency front end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811348670.7A CN109510604B (en) | 2018-11-13 | 2018-11-13 | Filter circuit applied to radio frequency front end |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109510604A true CN109510604A (en) | 2019-03-22 |
| CN109510604B CN109510604B (en) | 2023-10-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811348670.7A Active CN109510604B (en) | 2018-11-13 | 2018-11-13 | Filter circuit applied to radio frequency front end |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08237061A (en) * | 1995-02-28 | 1996-09-13 | Tokyo Tsuuki:Kk | Low pass filter |
| CN1369965A (en) * | 2001-02-07 | 2002-09-18 | 株式会社村田制作所 | Elastic surface wave filtering device |
| JP2003008385A (en) * | 2001-06-18 | 2003-01-10 | Murata Mfg Co Ltd | Composite lc filter circuit and composite lc filter component |
| CN101164228A (en) * | 2005-04-20 | 2008-04-16 | Nxp股份有限公司 | A parallel arranged linear amplifier and dc-dc converter |
| CN101277056A (en) * | 2007-03-30 | 2008-10-01 | 艾默生网络能源系统有限公司 | Filter circuit |
| CN101789796A (en) * | 2009-08-10 | 2010-07-28 | 上海闻泰电子科技有限公司 | Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor |
| CN102881981A (en) * | 2012-08-31 | 2013-01-16 | 华南理工大学 | Lumped element power divider integrated with band-pass filtering function |
| CN103138705A (en) * | 2011-12-01 | 2013-06-05 | 西安电子科技大学 | Band-pass filter |
| CN103545582A (en) * | 2012-07-10 | 2014-01-29 | 南京理工大学 | UWB (ultra wide band) band-pass filter |
| CN206461069U (en) * | 2017-02-13 | 2017-09-01 | 石家庄创天电子科技有限公司 | A kind of many transmission zero wave filters |
| CN108736909A (en) * | 2018-05-09 | 2018-11-02 | 深圳市盛路物联通讯技术有限公司 | The radio circuit and terminal of SAW filter combination anti aliasing purposes filter |
| CN208971478U (en) * | 2018-11-13 | 2019-06-11 | 上海艾为电子技术股份有限公司 | A kind of filter circuit applied to radio-frequency front-end |
-
2018
- 2018-11-13 CN CN201811348670.7A patent/CN109510604B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08237061A (en) * | 1995-02-28 | 1996-09-13 | Tokyo Tsuuki:Kk | Low pass filter |
| CN1369965A (en) * | 2001-02-07 | 2002-09-18 | 株式会社村田制作所 | Elastic surface wave filtering device |
| JP2003008385A (en) * | 2001-06-18 | 2003-01-10 | Murata Mfg Co Ltd | Composite lc filter circuit and composite lc filter component |
| CN101164228A (en) * | 2005-04-20 | 2008-04-16 | Nxp股份有限公司 | A parallel arranged linear amplifier and dc-dc converter |
| CN101277056A (en) * | 2007-03-30 | 2008-10-01 | 艾默生网络能源系统有限公司 | Filter circuit |
| CN101789796A (en) * | 2009-08-10 | 2010-07-28 | 上海闻泰电子科技有限公司 | Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor |
| CN103138705A (en) * | 2011-12-01 | 2013-06-05 | 西安电子科技大学 | Band-pass filter |
| CN103545582A (en) * | 2012-07-10 | 2014-01-29 | 南京理工大学 | UWB (ultra wide band) band-pass filter |
| CN102881981A (en) * | 2012-08-31 | 2013-01-16 | 华南理工大学 | Lumped element power divider integrated with band-pass filtering function |
| CN206461069U (en) * | 2017-02-13 | 2017-09-01 | 石家庄创天电子科技有限公司 | A kind of many transmission zero wave filters |
| CN108736909A (en) * | 2018-05-09 | 2018-11-02 | 深圳市盛路物联通讯技术有限公司 | The radio circuit and terminal of SAW filter combination anti aliasing purposes filter |
| CN208971478U (en) * | 2018-11-13 | 2019-06-11 | 上海艾为电子技术股份有限公司 | A kind of filter circuit applied to radio-frequency front-end |
Non-Patent Citations (2)
| Title |
|---|
| L. FANUCCI: "Fully integrated low-noise-amplifier with high quality factor L-C filter for 1.8 GHz wireless applications", ISCAS 2001. THE 2001 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS * |
| 刘祖华: "应用于 WLAN的低噪声放大器设计及射频收发前端集成", 中国优秀硕士学位论文全文数据库 * |
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| CN109510604B (en) | 2023-10-13 |
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Address after: Room 1201, No.2, Lane 908, Xiuwen Road, Minhang District, Shanghai, 201199 Patentee after: SHANGHAI AWINIC TECHNOLOGY Co.,Ltd. Country or region after: China Address before: Room 303-39, building 33, 680 Guiping Road, Xuhui District, Shanghai 200233 Patentee before: SHANGHAI AWINIC TECHNOLOGY Co.,Ltd. Country or region before: China |