CN103338019B - Balun circuit - Google Patents
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- CN103338019B CN103338019B CN201310219046.8A CN201310219046A CN103338019B CN 103338019 B CN103338019 B CN 103338019B CN 201310219046 A CN201310219046 A CN 201310219046A CN 103338019 B CN103338019 B CN 103338019B
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Abstract
Embodiments provide a kind of balun circuit, including: first group of quarter-wave balanced transmission line, second group of quarter-wave balanced transmission line and double-layer four-line compensating for coupling transmission line, described first group of quarter-wave balanced transmission line includes that the first quarter-wave transmission line and the second quarter-wave transmission line, described second group of quarter-wave balanced transmission line include the 3rd quarter-wave transmission line and the 4th quarter-wave transmission line；It is connected by double-layer four-line compensating for coupling transmission line between first group of quarter-wave balanced transmission line and second group of quarter-wave balanced transmission line.Therefore, inputted by quarter-wave transmission line single-ended signal, export at double-layer four-line compensating for coupling transmission line both-end differential signal, it is possible to realize high even modular character impedance and low strange modular character impedance, even modular character impedance is increased with the ratio of strange modular character impedance, is effectively improved balance.
Description
Technical field
The present invention relates to communication technical field, especially relate to a kind of balun circuit.
Background technology
Balun circuit (Balun), is also called balanced-to-unblanced transformer, has a wide range of applications in a communications system.When
Front microwave/millimeter wave Point-to-Point Communication System needs to cover multiple frequency band and standard, in addition it is also necessary to realize high rate data transmission.Accordingly
Ground, balun circuit is also faced with miniaturization and high performance design challenge.
The balance of existing integrated chip balun circuit is poor, causes performance low.Therefore, it is impossible to meet ultra broadband point pair
Point communication standards mandate.
Summary of the invention
The embodiment provides a kind of balun circuit, it is possible to realize high even modular character impedance and hinder with low strange modular character
Anti-, it is effectively improved balance.
On the one hand, it is provided that a kind of balun circuit, including: first group of quarter-wave balanced transmission line, second group four
/ mono-wavelength balance transmission line and double-layer four-line compensating for coupling transmission line, described first group of quarter-wave balanced transmission line
Including the first quarter-wave transmission line and the second quarter-wave transmission line, described second group of quarter-wave balance
Transmission line includes the 3rd quarter-wave transmission line and the 4th quarter-wave transmission line；Described first quarter-wave
One end of transmission line is connected with one end of the first transmission line in described double-layer four-line compensating for coupling transmission line；Described 2nd 4
One end of/mono-wavelength transmission line is connected with one end of the second transmission line in described double-layer four-line compensating for coupling transmission line；
One end of described 3rd quarter-wave transmission line and the 3rd transmission line in described double-layer four-line compensating for coupling transmission line
One end is connected；And one end of described 4th quarter-wave transmission line with in described double-layer four-line compensating for coupling transmission line
One end of the 4th transmission line be connected；The other end of described first quarter-wave transmission line and the described 1st/4th
The equal ground connection of the other end of wavelength transmission line, the other end of described second transmission line is connected with the other end of described 3rd transmission line
Connecing, the other end of described second quarter-wave transmission line is single-ended signal input port, described double-layer four-line compensating for coupling
The other end of described first transmission line in transmission line and the other end of described 4th transmission line are both-end differential signal outputs
Mouthful.
In a kind of possible implementation, described balun circuit uses complementary metal oxide semiconductors (CMOS) CMOS or bipolar
Complementary metal oxide semiconductors (CMOS) BiCMOS manufacturing process or GaAs and benzocyclobutene BCB integrated process.
In conjunction with any one implementation in above-mentioned implementation, in another kind of implementation, when described balun circuit
When using CMOS or BiCMOS manufacturing process, described double-layer four-line compensating for coupling transmission line is positioned at described CMOS or described BiCMOS
At least two metal level of manufacturing process；Described second transmission line in described double-layer four-line compensating for coupling transmission line and described
Three transmission lines are respectively positioned on the first metal layer in described at least two metal level；And described double-layer four-line compensating for coupling transmission line
In described first transmission line and described 4th transmission line be respectively positioned on the second metal level in described at least two metal level.
In conjunction with any one implementation in above-mentioned implementation, in another kind of implementation, described one or four/
One wavelength transmission line and described 4th quarter-wave transmission line be positioned at described the first metal layer, and described two or four point
One of wavelength transmission line and described 3rd quarter-wave transmission line be respectively positioned on described second metal level.
In conjunction with any one implementation in above-mentioned implementation, in another kind of implementation, when described balun circuit
When using CMOS technology or BiCMOS technique, described the first metal layer is MA layer, and described second metal level is E1 layer.
In conjunction with any one implementation in above-mentioned implementation, in another kind of implementation, described first group four points
One of wavelength transmission line include that the first screen layer, described first screen layer are positioned at described first group of quarter-wave transmission line
Lower section, and described first shielding layer grounding；Described second group of quarter-wave transmission line includes secondary shielding layer, described second
Screen layer is positioned at the lower section of described second group of quarter-wave transmission line, and described secondary shielding layer ground connection.
In conjunction with any one implementation in above-mentioned implementation, in another kind of implementation, described first screen layer
It is floating shape screen layer with described secondary shielding layer.
In conjunction with any one implementation in above-mentioned implementation, in another kind of implementation, described floating shape screen layer
Having centre cap, described floating shape screen layer passes through described centre cap ground connection.
In conjunction with any one implementation in above-mentioned implementation, in another kind of implementation, described first group four points
One of wavelength balance transmission line and described second group of quarter-wave balanced transmission line be spiral type stacked structures
In conjunction with any one implementation in above-mentioned implementation, in another kind of implementation, described first group four points
One of wavelength balance transmission line and described second group of quarter-wave balanced transmission line be the same Rotating fields of spiral type.
Embodiments of the invention provide balun circuit include first group of quarter-wave balanced transmission line, second group four
/ mono-wavelength balance transmission line and double-layer four-line compensating for coupling transmission line.First group of quarter-wave balanced transmission line and
It is connected by double-layer four-line compensating for coupling transmission line between two groups of quarter-wave balanced transmission lines.Therefore, by four points
One of wavelength transmission line single-ended signal input, double-layer four-line compensating for coupling transmission line both-end differential signal export, it is possible to realize
High even modular character impedance and low strange modular character impedance so that even modular character impedance increases, effectively with the ratio of strange modular character impedance
Ground improves balance.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, will make required in the embodiment of the present invention below
Accompanying drawing be briefly described, it should be apparent that, drawings described below is only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
It it is the structural schematic block diagram of a kind of balun circuit that the embodiment of the present invention provides shown in Fig. 1.
It it is the structural schematic block diagram of the balun circuit of one embodiment of the invention shown in Fig. 2.
Fig. 3 is the schematic diagram of the coupled characteristic of the balun circuit of one embodiment of the invention.
Fig. 4 is the schematic diagram of the non-equilibrium property of the balun circuit of one embodiment of the invention.
Fig. 5 is the schematic diagram of the balun circuit manufacturing process of one embodiment of the invention.
Fig. 6 is the schematic section structure chart of the balun circuit manufacturing process of one embodiment of the invention.
Fig. 7 is the double-layer four-line compensating for coupling transmission line of one embodiment of the invention position in balun circuit manufacturing process
Put schematic diagram.
Fig. 8 is that the quarter-wave balanced transmission line of one embodiment of the invention is in balun circuit manufacturing process
Position view.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly retouched
State, it is clear that described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, all
Belong to the scope of protection of the invention.
Firstly the need of explanation, in broad sense from the point of view of, the essence of balun circuit is that a unbalanced input is divided into two
The output that individual constant amplitude is reverse, in numerous balun circuit structures, Marchand balun circuit is the one being most widely used
Balun circuit, Marchand balun circuit is developed by coaxial balun circuit, generally comprises three parts: a balance end
Mouthful, a pair unbalanced difference port and one end coupling circuit, theoretical according to Marchand balun circuit, in Marchand balun
In the structure of circuit, need to meet following condition to obtain suitable balun circuit structure:
Here, k is the coefficient of coup, and θ is the electrical length of balanced transmission line, It is the unit in the S parameter matrix of Marchand balun circuit
Element, specifically may refer to discussion theoretical about Marchand in prior art, and here is omitted, thus, it is known that
Marchand balun circuit is counted as phase shifter A and the combination of phase shifter B.
It it is the structural schematic block diagram of a kind of balun circuit that the embodiment of the present invention provides shown in Fig. 1.
As it is shown in figure 1, balun circuit 100 includes two groups of quarter-wave balanced transmission lines, it is first group four points respectively
One of wavelength balance transmission line 101 and second group of quarter-wave balanced transmission line 102, and double-layer four-line compensating for coupling pass
Defeated line 103.First group of quarter-wave balanced transmission line 101 includes the first quarter-wave transmission line 111 and the 2nd 4
/ mono-wavelength transmission line 112；Second group of quarter-wave balanced transmission line 102 includes the 3rd quarter-wave transmission line
121 and the 4th quarter-wave transmission line 122.
One end of first quarter-wave transmission line 111 and the first biography in double-layer four-line compensating for coupling transmission line 103
One end of defeated line 131 is connected；One end of second quarter-wave transmission line 112 and double-layer four-line compensating for coupling transmission line
One end of the second transmission line 132 in 103 is connected；One end of 3rd quarter-wave transmission line 121 and described double-deck four
One end of the 3rd transmission line 133 in line compensating for coupling transmission line 103 is connected；4th quarter-wave transmission line 122
One end is connected with one end of the 4th transmission line 134 in double-layer four-line compensating for coupling transmission line 103.
The other end of the first quarter-wave transmission line 112 and the other end of the 4th quarter-wave transmission line 122
All ground connection, the other end of the second transmission line 132 is connected with the other end of described 3rd transmission line 133, the second quarter-wave
The other end of long transmission line 112 is single-ended signal input port, the first transmission line in double-layer four-line compensating for coupling transmission line 103
The other end of 131 and the other end of the 4th transmission line 134 are both-end differential signal outputs mouth.
Should be understood that balun circuit is inputted and both-end difference letter by the embodiment of the present invention as the single-ended signal of three port devices
Number output description be comparatively speaking, for example, it is also possible to be that the other end of the 3rd quarter-wave transmission line 121 is as list
End signal input port.Should be understood that this is not limited by the embodiment of the present invention, any conception based on the embodiment of the present invention, enter
The balun circuit device that the operations such as row simple replacement, reciprocity obtain, within broadly falling into protection scope of the present invention.
Embodiments of the invention provide balun circuit include first group of quarter-wave balanced transmission line, second group four
/ mono-wavelength balance transmission line and double-layer four-line compensating for coupling transmission line.First group of quarter-wave balanced transmission line and
It is connected by double-layer four-line compensating for coupling transmission line between two groups of quarter-wave balanced transmission lines.Pass through quarter-wave
Long transmission line single-ended signal inputs, and exports at double-layer four-line compensating for coupling transmission line both-end differential signal, it is possible to realize high even mould
Characteristic impedance and low strange modular character impedance so that even modular character impedance increases with the ratio of strange modular character impedance, is effectively improved
Balance.
Alternatively, schematically as in figure 2 it is shown, first group of quarter-wave balanced transmission line 101 and second group four points
One of wavelength balance transmission line 102 can be all quarter-wave spiral type stack balanced transmission line.Quarter-wave
Balanced transmission line uses spiral type stacked structures to be capable of the high coefficient of coup (Coupling Coefficient), it is thus achieved that
Broadside coupled (Tight Coupling) characteristic, i.e. relative bandwidth (Fraction Bandwidth) are more than 1(100%).Need
Bright, in fig. 2, in described double-layer four-line compensating for coupling transmission line 103, the reticule between adjacent two transmission lines represents
For the relation of the transmission that intercouples between this two transmission lines, such as: between the first transmission line 131 and the second transmission line 132
It is coupled relation that reticule i.e. represents between the first transmission line 131 and the second transmission line 132, and other is similar, further,
For first shown in Fig. 2 group quarter-wave balanced transmission line 101 and second group of quarter-wave balanced transmission line 102
In reticule, represent coupled relation equally, those skilled in the art can understand technical scheme with reference to the accompanying drawings, this
Place repeats the most one by one.
As it is shown on figure 3, obtain when satisfied shake index is 0.5dB, 1.0dB, 1.5dB and 2.0dB by training, can be real
Existing relative bandwidth is more than 1.On the premise of shaking index in satisfied band, the coefficient of coup is the biggest, and relative bandwidth is the biggest, accordingly, it is capable to
Enough meet the requirement of ultra-wide band point-to-point communication standard.
It addition, quarter-wave balanced transmission line uses spiral type stacked structures can reduce the face of balun circuit
Long-pending, for instance, it is possible to the whole circuit area realizing balun circuit is 265um × 115um, meet balun in Point-to-Point Communication System
The design requirement of circuit miniaturization.
Should be understood that the embodiment of the present invention is not limited to this, quarter-wave balanced transmission line can also use other to tie
Structure, Rotating fields as same in spiral type.
Theoretical according to Marchand, the output of both-end differential signal can characterize by equation below:
Wherein, ZoeFor equivalence idol modular character impedance, ZooFor equivalence strange modular character impedance, it is known that, in order to improve balun circuit
Balance, then need to make ZoeAs far as possible more than Zoo, so that S31/S21Ratio close to 1.
Based on this, alternatively, the balun circuit in the present embodiment can also include screen layer.Specifically, including the first screen
Covering layer and secondary shielding layer, the first screen layer is positioned at the lower section of first group of quarter-wave transmission line 101, and the first screen layer
Ground connection；Secondary shielding layer is positioned at the lower section of second group of quarter-wave transmission line 102, and secondary shielding layer ground connection.Alternatively,
First screen layer and secondary shielding layer can be floating shape screen layer, and further, floating shape screen layer has centre cap, floating shape
Screen layer passes through centre cap ground connection.Should be understood that the pattern of screen layer is not limited by the embodiment of the present invention.
Specifically, pass at first group of quarter-wave balanced transmission line 101 and second group of quarter-wave balance
The underface of defeated line 102 all has floating shape screen layer, and floating shape screen layer has centre cap, and floating shape screen layer is by this center
It is connected tap and chip.Therefore, it is possible to reduce balanced transmission line to chip medium ground longitudinal electric field effect, obtain relatively low very
Modular character impedance, as in Figure 4 (a), uses screen layer, when frequency is about at 15-45GHz, all achieves difference in band
The non-equilibrium property of amplitude of output is in the interval of [-1dB, 1dB].‘
As in Figure 4 (b), wcRepresent the live width of double-layer four-line compensating for coupling transmission line, gcRepresent double-layer four-line coupling
Compensate transmission line with the spacing between layer two-wire, lcBeing the line length of four line compensating for coupling transmission lines, l is first group or second group four points
One of the line length of wavelength balance transmission line.Obtained by training: at wc/gc=2, work as lcWhen/l is approximately greater than or equal to 8%, it is achieved that
In band, the non-equilibrium property of phase place of difference output is less than 1.13 °.
Therefore, the present invention can reduce the non-equilibrium property of amplitude and the non-equilibrium property of phase place simultaneously, thus is effectively improved balance
Property.
Alternatively, balun circuit can use complementary metal oxide semiconductors (CMOS) (Complementary Metal Oxide
Semiconductor, CMOS) or bipolar complementary metal oxide semiconductor (Bipolar Complementary Metal
Oxide Semiconductor, BiCMOS) manufacturing process, balun circuit can also use GaAs and BCB
(Benzocyclobutene, BCB) integrated process, etc..Should be understood that the embodiment of the present invention is to the manufacturing process of balun circuit also
Do not limit.Alternatively, when balun circuit uses CMOS or BiCMOS manufacturing process, double-layer four-line compensating for coupling transmission line 103
It is positioned at least two metal level of CMOS or BiCMOS manufacturing process.The second biography in double-layer four-line compensating for coupling transmission line 103
Defeated line 132 and the 3rd transmission line 133 are respectively positioned on the first metal layer at least two metal level；And double-layer four-line compensating for coupling
The second metal level that the first transmission line 131 in transmission line 103 and the 4th transmission line 134 are respectively positioned at least two metal level.
Further, the first quarter-wave transmission line 111 and the 4th quarter-wave transmission line 122 are respectively positioned on the first metal
Layer, and the second quarter-wave transmission line 112 and the 3rd quarter-wave transmission line 121 be respectively positioned on second layer metal
Layer.
Preferably, balun circuit uses CMOS or BiCMOS manufacturing process, as shown in Figure 5.Correspondingly, Fig. 6 is schematically
Show the structure chart of various piece in Fig. 5, (a) be the first metal layer MA layer (also referred to as " top layer metallic layer "), (b) be second
Metal level E1 layer, (c) be the 3rd metal level LY layer, (d) be the 4th metal level MQ layer, (e) be fifth metal layer M2 layer and (f)
For bottom metal layer M1 layer.
Specifically, double-deck compensating for coupling transmission line 103 may be located at the first metal layer of CMOS or BiCMOS manufacturing process
MA layer and the second metal level E1 layer.
Such as, the second transmission line 132 in double-layer four-line compensating for coupling transmission line 103 and the 3rd transmission line 133 are respectively positioned on
The first metal layer MA layer, alternatively, the first quarter-wave transmission line 111 and the 4th quarter-wave transmission line 122 are also
It is respectively positioned on the first metal layer MA layer, as shown in Figure 7.And the first transmission line 131 He in double-layer four-line compensating for coupling transmission line 103
4th transmission line 134 is respectively positioned on the first metal layer MA layer, alternatively, the second quarter-wave transmission line 112 and the three or four point
One of wavelength transmission line 121 be also respectively positioned on the second metal level E1 layer.As shown in Figure 8.
Should be understood that the embodiment of the present invention double-layer four-line compensating for coupling transmission line is positioned at manufacturing process which or which
Metal level does not limit.
Those of ordinary skill in the art are it is to be appreciated that combine the list of each example that the embodiments described herein describes
Unit and algorithm steps, it is possible to being implemented in combination in of electronic hardware or computer software and electronic hardware.These functions are actually
Perform with hardware or software mode, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel
Each specifically should being used for can be used different methods to realize described function, but this realization is it is not considered that exceed
The scope of the present invention.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, the system of foregoing description,
The specific works process of device and unit, is referred to the corresponding process in preceding method embodiment, does not repeats them here.
In several embodiments provided herein, it should be understood that disclosed balun circuit, can be passed through other
Mode realize.Such as, device embodiment described above is only schematically, such as, and the division of described unit, only
Dividing for a kind of logic function, actual can have when realizing other dividing mode, the most multiple unit or the assembly can be in conjunction with
Or it is desirably integrated into another system, or some features can be ignored, or do not perform.Another point, shown or discussed phase
Coupling between Hu or direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, device or unit or communication
Connect, can be electrical, machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, shows as unit
The parts shown can be or may not be physical location, i.e. may be located at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected according to the actual needs to realize the mesh of the present embodiment scheme
's.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.
If described function is using the form realization of SFU software functional unit and as independent production marketing or use, permissible
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is the most in other words
The part contributing prior art or the part of this technical scheme can embody with the form of software product, this meter
Calculation machine software product is stored in a storage medium, including some instructions with so that a computer equipment (can be individual
People's computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.
And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-Only Memory), random access memory are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic disc or CD.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with scope of the claims.
Claims (9)
1. a balun circuit, it is characterised in that including: first group of quarter-wave balanced transmission line, second group four/
One wavelength balance transmission line and double-layer four-line compensating for coupling transmission line, described first group of quarter-wave balanced transmission line includes
First quarter-wave transmission line and the second quarter-wave transmission line, described second group of quarter-wave balance transmission
Line includes the 3rd quarter-wave transmission line and the 4th quarter-wave transmission line；
One end of described first quarter-wave transmission line and the first transmission in described double-layer four-line compensating for coupling transmission line
One end of line is connected；
One end of described second quarter-wave transmission line and the second transmission in described double-layer four-line compensating for coupling transmission line
One end of line is connected；
One end of described 3rd quarter-wave transmission line and the 3rd transmission in described double-layer four-line compensating for coupling transmission line
One end of line is connected；And
One end of described 4th quarter-wave transmission line and the 4th transmission in described double-layer four-line compensating for coupling transmission line
One end of line is connected；
The other end of described first quarter-wave transmission line and the other end of described 4th quarter-wave transmission line are equal
Ground connection, the other end of described second transmission line is connected with the other end of described 3rd transmission line, described second quarter-wave
The other end of long transmission line is single-ended signal input port, described first transmission in described double-layer four-line compensating for coupling transmission line
The other end of line and the other end of described 4th transmission line are both-end differential signal outputs mouth.
Balun circuit the most according to claim 1, it is characterised in that described balun circuit uses CMOS (Complementary Metal Oxide Semiconductor) half
Conductor CMOS technology or bipolar complementary metal oxide semiconductor BiCMOS technique or GaAs or benzocyclobutene BCB technique system
Make.
Balun circuit the most according to claim 2, it is characterised in that when described balun circuit use CMOS technology or
When BiCMOS technique or BCB technique manufacture,
Under described CMOS technology or described BiCMOS technique or described BCB technique, described double-layer four-line compensating for coupling transmission line
It is positioned at least two metal level；
Wherein, described second transmission line and described 3rd transmission line are respectively positioned on the first metal in described at least two metal level
Layer；And
Described first transmission line and described 4th transmission line are respectively positioned on the second metal level in described at least two metal level.
Balun circuit the most according to claim 3, it is characterised in that
Described first quarter-wave transmission line and described 4th quarter-wave transmission line be positioned at described first metal
Layer, and described second quarter-wave transmission line and described 3rd quarter-wave transmission line be respectively positioned on described second gold medal
Belong to layer.
5. according to the balun circuit described in any one of claim 1-4, it is characterised in that
Described balun circuit also includes the first screen layer and secondary shielding layer；Described first screen layer is positioned at described first group four points
One of the lower section of wavelength transmission line, and described first shielding layer grounding, to reduce described first group of quarter-wave transmission line
Longitudinal electric field effect over the ground；
Described secondary shielding layer is positioned at the lower section of described second group of quarter-wave transmission line, and described secondary shielding layer connects
Ground, to reduce described second group of quarter-wave transmission line longitudinal electric field effect over the ground.
Balun circuit the most according to claim 5, it is characterised in that described first screen layer and described secondary shielding layer are equal
For floating shape screen layer.
Balun circuit the most according to claim 6, it is characterised in that
Described floating shape screen layer has centre cap, and described floating shape screen layer passes through described centre cap ground connection.
8. according to the balun circuit described in any one of claim 1-4, it is characterised in that described first group of quarter-wave is put down
Weighing apparatus transmission line and described second group of quarter-wave balanced transmission line are spiral type stacked structures.
9. according to the balun circuit described in any one of claim 1-4, it is characterised in that described first group of quarter-wave is put down
Weighing apparatus transmission line and described second group of quarter-wave balanced transmission line are the same Rotating fields of spiral type.
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| CN201310219046.8A CN103338019B (en) | 2013-06-04 | 2013-06-04 | Balun circuit |
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| CN201310219046.8A CN103338019B (en) | 2013-06-04 | 2013-06-04 | Balun circuit |
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| CN103595366B (en) * | 2013-10-17 | 2016-05-11 | 天津大学 | A kind of 0.6～1.2GHz CMOS second order dot matrix Ba Lun |
| CN103716010B (en) * | 2013-12-30 | 2017-11-17 | 宇龙计算机通信科技(深圳)有限公司 | A kind of balun circuit and terminal |
| CN108768337A (en) * | 2014-08-19 | 2018-11-06 | 华为技术有限公司 | A kind of balun power amplifier |
| CN106100602A (en) * | 2016-08-11 | 2016-11-09 | 宜确半导体（苏州）有限公司 | A kind of wideband balun impedance transformer |
| US10666231B2 (en) * | 2016-10-27 | 2020-05-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Balun arrangement |
| CN111129681B (en) | 2018-10-31 | 2021-05-07 | 华为技术有限公司 | Balance-unbalance conversion device, communication device and communication system |
| CN110854496B (en) * | 2019-09-11 | 2021-06-29 | 西安电子科技大学 | Compact three-dimensional Murphy balun based on through silicon via |
| CN111029701A (en) * | 2019-12-31 | 2020-04-17 | 成都蓝大科技有限公司 | Novel branch line balun |
| CN113972457B (en) * | 2021-09-14 | 2022-12-27 | 北京邮电大学 | Frequency-independent broadband phase-inverting phase shifter and filtering full-passband isolation balun |
| CN117080704A (en) * | 2022-05-09 | 2023-11-17 | 华为技术有限公司 | Balun and differential amplifier |
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| CN1377100A (en) * | 2001-03-22 | 2002-10-30 | 财团法人工业技术研究院 | Multi-layer inductor-capacitor resonance type converter from balance to unbalance |
| CN102332632A (en) * | 2010-06-25 | 2012-01-25 | Tdk株式会社 | The film balanced-to-unblanced transformer |
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| CN103338019A (en) | 2013-10-02 |
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