CN109004913A - A kind of intermediate frequency balun circuit - Google Patents
A kind of intermediate frequency balun circuit Download PDFInfo
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- CN109004913A CN109004913A CN201710416814.7A CN201710416814A CN109004913A CN 109004913 A CN109004913 A CN 109004913A CN 201710416814 A CN201710416814 A CN 201710416814A CN 109004913 A CN109004913 A CN 109004913A
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- capacitor
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- inductance
- intermediate frequency
- balun circuit
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- 230000005611 electricity Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 description 11
- 230000037431 insertion Effects 0.000 description 11
- 230000009466 transformation Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/42—Balance/unbalance networks
Abstract
The invention discloses a kind of intermediate frequency balun circuits, including first port, second port, third port, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the first inductance and the second inductance；First port is single-ended port；Second port and third port are a pair of of port of differential ends；First capacitor is identical with the capacitance of the second capacitor；The capacitance of third capacitor and the 4th capacitor is identical；The sensibility reciprocal value of first inductance and the second inductance is identical；First capacitor and the latter end ground connection of the first inductance series connection, the other end are connected to first port；Third capacitor, the second inductance and the second capacitor are sequentially connected in series latter end ground connection, and the other end is connected to first port；Second port is connected between the first capacitor and the first inductance after connecting with the 4th capacitor；Third port is connected between second capacitor and the second inductance.Circuit of the invention realizes that circuit form is simple using 2 inductance, 4 capacity cells, at low cost, occupies little space.
Description
Technical field
The present invention relates to circuit fields, and in particular to a kind of intermediate frequency balun circuit used for ETC industry DSRC equipment.
Background technique
Difference channel has that high-gain, electromagnetism interference, anti-power supply noise, anti-Earth noise ability are very high, inhibit even humorous
The advantages that wave.Nowadays, in RF circuit and low-frequency channel, difference channel using more and more extensive.So the importance of balun
Also growing day by day.
Single-ended balanced transformation and resistance between differential configuration may be implemented in balun (Balun:Balance-UnBalance)
Anti- change action.Existing balun form has transformer type balun, micro strip line type balun, these balun prices are more expensive, volume compared with
Greatly.Also, the element of existing balun circuit be it is pre-fixed, utilize the balun circuit carry out impedance transformation when input resistance
Anti- and output impedance is relatively fixed, when using non-rated operation frequency in use, its impedance transformation the effect is unsatisfactory.
Summary of the invention
For the problems of in the prior art, the purpose of the present invention is to provide a kind of intermediate frequency balun circuit, the skills
Art scheme use discrete component, structure is simple, have the advantages that it is at low cost, occupy little space.
To achieve the above object of the invention, technical scheme is as follows:
A kind of intermediate frequency balun circuit, including first port, second port, third port, first capacitor, the second capacitor,
Three capacitors, the 4th capacitor, the first inductance and the second inductance；
The first port is single-ended port；
The second port and third port are a pair of of port of differential ends；
The first capacitor is identical with the capacitance of the second capacitor；
The capacitance of the third capacitor and the 4th capacitor is identical；
The sensibility reciprocal value of first inductance and the second inductance is identical；
The first capacitor and the latter end ground connection of the first inductance series connection, the other end are connected to first port；
The third capacitor, the second inductance and the second capacitor are sequentially connected in series latter end ground connection, and the other end is connected to first end
Mouthful；
The second port is connected between the first capacitor and the first inductance after connecting with the 4th capacitor；
The third port is connected between second capacitor and the second inductance.
Further, above-mentioned intermediate frequency balun circuit, the capacitance C of the first capacitor, the sensibility reciprocal value L of the first inductance,
The capacitance Cb of three capacitors meets following relationship:
W=2 π f；
Above-mentioned formula, Z1 are the impedance of first port, and Z2 is the impedance of second port and third port, XcIt is described first
The capacitive reactance of capacitor, f are the working frequency of the intermediate frequency balun circuit.
Further, the working frequency of above-mentioned intermediate frequency balun circuit, the intermediate frequency balun circuit is not more than 500MHz.
Further, above-mentioned intermediate frequency balun circuit, the working frequency of the intermediate frequency balun circuit are 40MHz, output end
Mouthful impedance Z 1 be 50 Ω, the impedance Z 2 of Differential Input port is 222 Ω, and the sensibility reciprocal value L of the first inductance and the second inductance is
The capacitance C of 560nH, first capacitor and the second capacitor is 27pF, and the capacitance Cb of third capacitor and the 4th capacitor is 1nF.
Further, above-mentioned intermediate frequency balun circuit, the working frequency of the intermediate frequency balun circuit are 500MHz, output end
Mouthful impedance Z 1 be 50 Ω, the impedance Z 2 of Differential Input port is 50 Ω, and the sensibility reciprocal value L of the first inductance and the second inductance is
The capacitance C of 22nH, first capacitor and the second capacitor is 4.5pF, and the capacitance Cb of third capacitor and the 4th capacitor is 300pF.
Further, above-mentioned intermediate frequency balun circuit, the working frequency of the intermediate frequency balun circuit are 10MHz, output end
Mouthful impedance Z 1 be 50 Ω, the impedance Z 2 of Differential Input port is 20 Ω, and the sensibility reciprocal value L of the first inductance and the second inductance is
The capacitance C of 712nH, first capacitor and the second capacitor is 355pF, and the capacitance Cb of third capacitor and the 4th capacitor is 100nF.
Further, above-mentioned intermediate frequency balun circuit, the first capacitor, the second capacitor, third capacitor, the 4th capacitor,
First inductance and the second inductance are set on printed circuit board.
Further, above-mentioned intermediate frequency balun circuit, the first capacitor, the second capacitor, third capacitor, the 4th capacitor,
First inductance and the second inductance are to be detachably connected on a printed circuit.
Further, above-mentioned intermediate frequency balun circuit, the first port and second port are as input port, third end
When mouth is output port, input port signal is that amplitude is equal, phase phase difference 180 degree.
The invention has the following advantages:
1, circuit of the invention realizes that circuit form is simple using 2 inductance, 4 capacity cells, at low cost, occupies empty
Between it is small；
2, the LC element in circuit provided by the invention meets particular kind of relationship, guarantees balance conversion effect, meanwhile, this is discrete
Element be it is replaceable, can be replaced according to the difference of working frequency and demand impedance, guarantee that its conversion effect is optimal.
Detailed description of the invention
Fig. 1 is the intermediate frequency balun circuit figure of one embodiment of the invention.
Fig. 2 is the present invention using 40MHz as the differential input end phase difference value figure of the embodiment of rated operation frequency.
Fig. 3 is that the present invention is damaged by the insertion of the differential input end of the embodiment of rated operation frequency to output end of 40MHz
Consumption figure.
Fig. 4 is the present invention using 40MHz as the output end S11 curve graph of the embodiment of rated operation frequency.
Fig. 5 is the present invention using 500MHz as the differential input end phase difference value figure of the embodiment of rated operation frequency.
Fig. 6 is that the present invention is damaged by the insertion of the differential input end of the embodiment of rated operation frequency to output end of 500MHz
Consumption figure.
Fig. 7 is the present invention using 500MHz as the output end S11 curve graph of the embodiment of rated operation frequency.
The position Fig. 8 present invention is using 10MHz as the differential input end phase difference value picture of the embodiment of rated operation frequency.
Fig. 9 is that the present invention is damaged by the insertion of the differential input end of the embodiment of rated operation frequency to output end of 10MHz
Consumption figure.
Figure 10 is the present invention using 10MHz as the output end S11 curve graph of the embodiment of rated operation frequency.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the invention discloses a kind of intermediate frequency balun circuit, including first port, second port, third end
Mouth, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the first inductance and the second inductance；The first port is single-ended
Port；The second port and third port are a pair of of port of differential ends；The capacitance of the first capacitor and the second capacitor
It is identical；The capacitance of the third capacitor and the 4th capacitor is identical；The sensibility reciprocal value of first inductance and the second inductance is identical；It is described
First capacitor and the latter end ground connection of the first inductance series connection, the other end are connected to first port；The third capacitor, the second inductance and
Second capacitor is sequentially connected in series latter end ground connection, and the other end is connected to first port；The second port and the 4th capacitor string
It is connected to after connection between the first capacitor and the first inductance；The third port is connected to second capacitor and the second inductance
Between.
Foregoing circuit only includes four capacitors and two inductance, and structure is simple, therefore at low cost, is occupied little space, and is solved
Existing balun circuit is expensive and occupied space big problem.
Further, above-mentioned intermediate frequency balun circuit, the capacitance C of the first capacitor, the sensibility reciprocal value L of the first inductance,
The capacitance Cb of three capacitors meets following relationship:
W=2 π f；
Above-mentioned formula, Z1 are the impedance of first port, and Z2 is the impedance of second port and third port, XcIt is described first
The capacitive reactance of capacitor, f are the working frequency of the intermediate frequency balun circuit.The element of this balun circuit meets above-mentioned relation, Neng Goubao
Card impedance transformation and result is best suitable for current working frequency and impedance transformation demand, obtain best effect.
Further, above-mentioned intermediate frequency balun circuit, the first capacitor, the second capacitor, third capacitor, the 4th capacitor,
First inductance and the second inductance are set on printed circuit board.In the inventive solutions, the first capacitor, the second electricity
Appearance, third capacitor, the 4th capacitor, the first inductance and the second inductance are to be detachably connected on a printed circuit, so as to the frequency that works
Rate replaces inductance or capacitor preferably when changing, to guarantee to balance conversion effect.The first port and second port are made
For input port, when third port is output port, input port signal is that amplitude is equal, phase phase difference 180 degree.In addition, this
The balun circuit input and output of embodiment have invertibity, the first port and second port as output port, third end
When mouth is input port, output port signal is that amplitude is equal, phase phase difference 180 degree.
In the present embodiment, the working frequency of the intermediate frequency balun circuit is not more than 500MHz.The following are use institute of the present invention
State several test cases of intermediate frequency balun circuit:
Example 1
The rated operation frequency of intermediate frequency balun circuit is set as 40MHz, the impedance Z 1 of output port is 50 Ω, Differential Input
The impedance Z 2 of port is 222 Ω, the sensibility reciprocal value L of the first inductance being calculated according to the formula of the technical program and the second inductance
For 560nH, the capacitance C of first capacitor and the second capacitor is 27pF, and the capacitance Cb of third capacitor and the 4th capacitor is 1nF.
The circuit in this example is detected under different working frequencies, as a result as follows:
The phase of differential input end in the example is detected (referring to fig. 2), the phase of second port to first port
Poor phase (S (2,1))=93.587 degree, freq=40.00MHz；Third port to first port phase difference phase (S (3,
1) it)=- 84.881 spends, freq=40.00MHz；The phase difference of differential ends is 180 degree or so.
Insertion loss to differential input end in the example to output port as shown in figure 3, third port to first port
Insertion loss be -3.098dB；It can be seen from figure 3, the insertion loss of differential ends is at 40MHz frequency all on the left side 3.1dB
It is right.
The S11 of output port (first port) in the example (S11 is input reflection coefficient, that is, input return loss)
As shown in figure 4, under conditions of freq=32.00MHz, dB (S (1,1))=- 10.261dB；In the item of freq=53.00MHz
Under part, dB (S (1,1))=- 12.110dB；Return loss is greater than 10dB in frequency range 32MHz-53MHz.
Example 2
The rated operation frequency of intermediate frequency balun circuit is set as 500MHz, the impedance Z 1 of output port is 50 Ω, and difference is defeated
The impedance Z 2 of inbound port is 50 Ω, the sensibility reciprocal value of the first inductance and the second inductance that are calculated according to the formula of the technical program
L is 22nH, and the capacitance C of first capacitor and the second capacitor is 4.5pF, and the capacitance Cb of third capacitor and the 4th capacitor is 300pF.?
The circuit in this example is detected under different working frequencies, as a result as follows:
The phase of differential input end in the example is detected (referring to Fig. 5), the phase of second port to first port
Poor phase (S (2,1))=- 86.602 degree, freq=502.0MHz；Phase difference phase (S of the third port to first port
(3,1))=89.879 degree, freq=503.0MHz；The phase difference of differential ends is 180 degree or so.
Insertion loss to differential input end in the example to output port as shown in fig. 6, second port to first port
Insertion loss be -3.126dB；The insertion loss of differential ends is greater than at the frequency of 500MHz it can be seen from Fig. 6
3.1dB。
The S11 of output port (first port) is as shown in Figure 7 in the example.
Example 3
The rated operation frequency of intermediate frequency balun circuit is set as 10MHz, the impedance Z 1 of output port is 50 Ω, Differential Input
The impedance Z 2 of port is 20 Ω, the sensibility reciprocal value L of the first inductance being calculated according to the formula of the technical program and the second inductance
For 712nH, the capacitance C of first capacitor and the second capacitor is 355pF, and the capacitance Cb of third capacitor and the 4th capacitor is 100nF.
The circuit in this example is detected under different working frequencies, as a result as follows:
The phase of differential input end in the example is detected (referring to Fig. 8), the phase of second port to first port
Poor phase (S (2,1))=- 89.608 degree, freq=10.00MHz；Phase difference phase (S of the third port to first port
(3,1))=90.301 degree, freq=10.00MHz；The phase difference of differential ends is 180 degree or so.
Insertion loss to differential input end in the example to output port as shown in figure 9, second port to first port
Insertion loss 2.986dB.The S11 of output port (first port) is as shown in Figure 10 in the example.
The test result of above-mentioned each example is it can be proved that technical solution of the present invention can obtain preferable conversion effect
Fruit.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.If in this way, belonging to the model of the claims in the present invention and its equivalent technology to these modifications and changes of the present invention
Within enclosing, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of intermediate frequency balun circuit, it is characterised in that；Including first port, second port, third port, first capacitor,
Two capacitors, third capacitor, the 4th capacitor, the first inductance and the second inductance；
The first port is single-ended port；
The second port and third port are a pair of of port of differential ends；
The first capacitor is identical with the capacitance of the second capacitor；
The capacitance of the third capacitor and the 4th capacitor is identical；
The sensibility reciprocal value of first inductance and the second inductance is identical；
The first capacitor and the latter end ground connection of the first inductance series connection, the other end are connected to first port；
The third capacitor, the second inductance and the second capacitor are sequentially connected in series latter end ground connection, and the other end is connected to first port；
The second port is connected between the first capacitor and the first inductance after connecting with the 4th capacitor；
The third port is connected between second capacitor and the second inductance.
2. intermediate frequency balun circuit as described in claim 1, it is characterised in that: the capacitance C of the first capacitor, the first inductance
Sensibility reciprocal value L, third capacitor capacitance Cb meet following relationship:
W=2 π f；
Above-mentioned formula, Z1 are the impedance of first port, and Z2 is the impedance of second port and third port, XcFor the first capacitor
Capacitive reactance, f be the intermediate frequency balun circuit working frequency.
3. intermediate frequency balun circuit as claimed in claim 2, it is characterised in that: the working frequency of the intermediate frequency balun circuit is little
In 500MHz.
4. intermediate frequency balun circuit as claimed in claim 2, it is characterised in that: the working frequency of the intermediate frequency balun circuit is
40MHz, the impedance Z 1 of output port are 50 Ω, and the impedance Z 2 of Differential Input port is 222 Ω, the first inductance and the second inductance
Sensibility reciprocal value L is 560nH, and the capacitance C of first capacitor and the second capacitor is 27pF, and the capacitance Cb of third capacitor and the 4th capacitor is
1nF。
5. intermediate frequency balun circuit as claimed in claim 2, it is characterised in that: the working frequency of the intermediate frequency balun circuit is
500MHz, the impedance Z 1 of output port are 50 Ω, and the impedance Z 2 of Differential Input port is 50 Ω, the first inductance and the second inductance
Sensibility reciprocal value L is 22nH, and the capacitance C of first capacitor and the second capacitor is 4.5pF, and the capacitance Cb of third capacitor and the 4th capacitor is
300pF。
6. intermediate frequency balun circuit as claimed in claim 2, it is characterised in that: the working frequency of the intermediate frequency balun circuit is
10MHz, the impedance Z 1 of output port are 50 Ω, and the impedance Z 2 of Differential Input port is 20 Ω, the first inductance and the second inductance
Sensibility reciprocal value L is 712nH, and the capacitance C of first capacitor and the second capacitor is 355pF, and the capacitance Cb of third capacitor and the 4th capacitor is
100nF。
7. the intermediate frequency balun circuit as described in claim 1-6 is any, it is characterised in that: the first capacitor, the second capacitor,
Three capacitors, the 4th capacitor, the first inductance and the second inductance are set on printed circuit board.
8. intermediate frequency balun circuit as claimed in claim 7, it is characterised in that: the first capacitor, the second capacitor, third electricity
Appearance, the 4th capacitor, the first inductance and the second inductance are to be detachably connected on a printed circuit.
9. the intermediate frequency balun circuit as described in claim 1-6 is any, it is characterised in that: the first port and second port are made
For input port, when third port is output port, input port signal is that amplitude is equal, phase phase difference 180 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710416814.7A CN109004913A (en) | 2017-06-06 | 2017-06-06 | A kind of intermediate frequency balun circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710416814.7A CN109004913A (en) | 2017-06-06 | 2017-06-06 | A kind of intermediate frequency balun circuit |
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| CN201710416814.7A Pending CN109004913A (en) | 2017-06-06 | 2017-06-06 | A kind of intermediate frequency balun circuit |
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| CN106209010A (en) * | 2016-07-25 | 2016-12-07 | 宜确半导体（苏州）有限公司 | A kind of intelligent terminal and balun thereof |
| CN206932205U (en) * | 2017-06-06 | 2018-01-26 | 北京握奇智能科技有限公司 | A kind of intermediate frequency balun circuit |
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2017
- 2017-06-06 CN CN201710416814.7A patent/CN109004913A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080100663A (en) * | 2007-05-14 | 2008-11-19 | 광운대학교 산학협력단 | Lattice type lc balun with series lc resonant circuit |
| US20100060376A1 (en) * | 2008-09-10 | 2010-03-11 | Ying-Chieh Shyu | Balun device |
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