CN206932205U - A kind of intermediate frequency balun circuit - Google Patents
A kind of intermediate frequency balun circuit Download PDFInfo
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- CN206932205U CN206932205U CN201720645917.6U CN201720645917U CN206932205U CN 206932205 U CN206932205 U CN 206932205U CN 201720645917 U CN201720645917 U CN 201720645917U CN 206932205 U CN206932205 U CN 206932205U
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Abstract
The utility model discloses a kind of intermediate frequency balun circuit, including first port, second port, the 3rd port, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first inductance and the second inductance；First port is single-ended port；Second port and a pair of ports that the 3rd port is differential ends；The capacitance of first electric capacity and the second electric capacity is identical；The capacitance of 3rd electric capacity and the 4th electric capacity is identical；The sensibility reciprocal value of first inductance and the second inductance is identical；First electric capacity and the latter end ground connection of the first inductance series connection, the other end are connected to first port；3rd electric capacity, the second inductance and the second electric capacity are sequentially connected in series latter end ground connection, and the other end is connected to first port；Second port is connected to after being connected with the 4th electric capacity between first electric capacity and the first inductance；3rd port is connected between second electric capacity and the second inductance.Circuit of the present utility model realizes that circuit form is simple, and cost is low, occupies little space using 2 inductance, 4 capacity cells.
Description
Technical field
It the utility model is related to circuit field, and in particular to a kind of intermediate frequency balun electricity used for ETC industry DSRC equipment
Road.
Background technology
Difference channel have high-gain, electromagnetism interference, anti-power supply noise, anti-Earth noise ability it is very high, suppress even it is humorous
The advantages that ripple.Nowadays, in RF circuits and low-frequency channel, the use of difference channel is more and more extensive.So importance of balun
Also it is growing day by day.
Balun (Balun：Balance-UnBalance single-ended balanced transformation and resistance between differential configuration can) be realized
Anti- change action.Existing balun form has transformer type balun, micro strip line type balun, and these baluns are expensive, volume compared with
Greatly.Also, the element of existing balun circuit is pre-fixed, inputs and hinders when carrying out impedance transformation using the balun circuit
Anti- and output impedance is relatively fixed, when the non-rated operation frequency of use is in use, its impedance transformation effect is unsatisfactory.
Utility model content
For the problems of in the prior art, the purpose of this utility model is to provide a kind of intermediate frequency balun circuit,
The technical scheme uses discrete component, simple in construction, has the advantages of cost is low, occupies little space.
To reach above-mentioned purpose of utility model, the technical solution of the utility model is as follows：
A kind of intermediate frequency balun circuit, including first port, second port, the 3rd port, the first electric capacity, the second electric capacity,
Three electric capacity, the 4th electric capacity, the first inductance and the second inductance；
The first port is single-ended port；
The second port and a pair of ports that the 3rd port is differential ends；
The capacitance of first electric capacity and the second electric capacity is identical；
The capacitance of 3rd electric capacity and the 4th electric capacity is identical；
The sensibility reciprocal value of first inductance and the second inductance is identical；
The latter end ground connection of first electric capacity and the first inductance series connection, the other end are connected to first port；
3rd electric capacity, the second inductance and second electric capacity are sequentially connected in series latter end ground connection, and the other end is connected to first end
Mouthful；
The second port is connected to after being connected with the 4th electric capacity between first electric capacity and the first inductance；
3rd port is connected between second electric capacity and the second inductance.
Further, above-mentioned intermediate frequency balun circuit, the capacitance C of first electric capacity, the sensibility reciprocal value L of the first inductance,
The capacitance Cb of three electric capacity meets following relation：
W=2 π f；
Above-mentioned formula, Z1 are the impedance of first port, and Z2 is the impedance of second port and the 3rd port, XcFor described first
The capacitive reactance of electric capacity, f are the working frequency of the intermediate frequency balun circuit.
Further, above-mentioned intermediate frequency balun circuit, the working frequency of the intermediate frequency balun circuit are 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, the first electric capacity and the second electric capacity is 27pF, and the capacitance Cb of the 3rd electric capacity and the 4th electric capacity 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, the first electric capacity and the second electric capacity is 4.5pF, and the capacitance Cb of the 3rd electric capacity and the 4th electric capacity 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, the first electric capacity and the second electric capacity is 355pF, and the capacitance Cb of the 3rd electric capacity and the 4th electric capacity is 100nF.
Further, above-mentioned intermediate frequency balun circuit, first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity,
First inductance and the second inductance are arranged on printed circuit board (PCB).
Further, above-mentioned intermediate frequency balun circuit, first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity,
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, the 3rd end
When mouth is output port, input port signal is that amplitude is equal, phase difference 180 degree.
The utility model has the advantages that：
1st, circuit of the present utility model realizes that circuit form is simple, and cost is low, accounts for using 2 inductance, 4 capacity cells
It is small with space；
2nd, the LC elements in circuit provided by the utility model meet particular kind of relationship, ensure balance conversion effect, meanwhile, should
Discrete component is replaceable, can be changed according to the difference of working frequency and demand impedance, ensure its conversion effect most
It is excellent.
Brief description of the drawings
Fig. 1 is the intermediate frequency balun circuit figure of the utility model one embodiment.
Fig. 2 is differential input end phase difference value figure of the utility model using 40MHz as the embodiment of rated operation frequency.
Fig. 3 is differential input end inserting to output end of the utility model using 40MHz as the embodiment of rated operation frequency
Enter loss figure.
Fig. 4 is output end S11 curve map of the utility model using 40MHz as the embodiment of rated operation frequency.
Fig. 5 is differential input end phase difference value figure of the utility model using 500MHz as the embodiment of rated operation frequency.
Fig. 6 is differential input end inserting to output end of the utility model using 500MHz as the embodiment of rated operation frequency
Enter loss figure.
Fig. 7 is output end S11 curve map of the utility model using 500MHz as the embodiment of rated operation frequency.
Differential input end phase difference value picture of Fig. 8 positions the utility model using 10MHz as the embodiment of rated operation frequency.
Fig. 9 is differential input end inserting to output end of the utility model using 10MHz as the embodiment of rated operation frequency
Enter loss figure.
Figure 10 is output end S11 curve map of the utility model using 10MHz as the embodiment of rated operation frequency.
Embodiment
The utility model is described in detail with reference to the accompanying drawings and examples.
As shown in figure 1, the utility model discloses a kind of intermediate frequency balun circuit, including first port, second port, the 3rd
Port, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first inductance and the second inductance；The first port is single
The port at end；The second port and a pair of ports that the 3rd port is differential ends；The appearance of first electric capacity and the second electric capacity
It is worth identical；The capacitance of 3rd electric capacity and the 4th electric capacity is identical；The sensibility reciprocal value of first inductance and the second inductance is identical；Institute
The first electric capacity and the latter end ground connection of the first inductance series connection are stated, the other end is connected to first port；3rd electric capacity, the second inductance
Latter end ground connection is sequentially connected in series with the second electric capacity, the other end is connected to first port；The second port and the 4th electric capacity
It is connected to after series connection between first electric capacity and the first inductance；3rd port is connected to second electric capacity and the second electricity
Between sense.
Foregoing circuit only includes four electric capacity and two inductance, simple in construction, therefore cost is low, occupies little space, and solves
Existing balun circuit is expensive and the problem of space-consuming is big.
Further, above-mentioned intermediate frequency balun circuit, the capacitance C of first electric capacity, the sensibility reciprocal value L of the first inductance,
The capacitance Cb of three electric capacity meets following relation：
W=2 π f；
Above-mentioned formula, Z1 are the impedance of first port, and Z2 is the impedance of second port and the 3rd port, XcFor described first
The capacitive reactance of electric capacity, 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 conversion and result best suit current working frequency and impedance conversion demand, obtain best effect.
Further, above-mentioned intermediate frequency balun circuit, first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity,
First inductance and the second inductance are arranged on printed circuit board (PCB).In the technical solution of the utility model, first electric capacity,
Two electric capacity, the 3rd electric capacity, the 4th electric capacity, the first inductance and the second inductance are on a printed circuit to be detachably connected, so as to work
Working frequency changes inductance or electric capacity preferably when changing, so as to ensure to balance conversion effect.The first port and the second end
Mouth is used as input port, and when the 3rd port is output port, input port signal is that amplitude is equal, phase difference 180 degree.Separately
Outside, the balun circuit input and output of the present embodiment have an invertibity, and the first port and second port are as output port, and
When three ports are input port, output port signal is that amplitude is equal, phase difference 180 degree.
In the present embodiment, the working frequency of the intermediate frequency balun circuit is not more than 500MHz.It is new using this practicality below
Several test cases of intermediate frequency balun circuit described in type：
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 first inductance being calculated according to the formula of the technical program and the second inductance sensibility reciprocal value L
For 560nH, the capacitance C of the first electric capacity and the second electric capacity is 27pF, and the capacitance Cb of the 3rd electric capacity and the 4th electric capacity is 1nF.
Under different working frequencies to this example in circuit detect, it is 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；3rd port to first port phase difference phase (S (3,
1))=- 84.881 spend, 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, the 3rd port to first port
Insertion loss be -3.098dB；The insertion loss of differential ends is all left in 3.1dB at 40MHz frequencies it can be seen from Fig. 3
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 freq=53.00MHz bar
Under part, dB (S (1,1))=- 12.110dB；Return loss is more 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 first inductance and the sensibility reciprocal value of the second inductance being calculated according to the formula of the technical program
L is 22nH, and the capacitance C of the first electric capacity and the second electric capacity is 4.5pF, and the capacitance Cb of the 3rd electric capacity and the 4th electric capacity is 300pF.
The circuit in this example is detected under different working frequencies, it is 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 3rd 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 more than at 500MHz frequency 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 first inductance being calculated according to the formula of the technical program and the second inductance sensibility reciprocal value L
For 712nH, the capacitance C of the first electric capacity and the second electric capacity is 355pF, and the capacitance Cb of the 3rd electric capacity and the 4th electric capacity is 100nF.
Under different working frequencies to this example in circuit detect, it is 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 3rd 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 can prove that the technical solution of the utility model can obtain preferable conversion
Effect.
Obviously, those skilled in the art can carry out various changes and modification without departing from this practicality to the utility model
New spirit and scope.So, if belonging to the utility model claims to these modifications and variations of the present utility model
And its within the scope of equivalent technology, then the utility model is also intended to comprising including these changes and modification.
Claims (9)
- A kind of 1. intermediate frequency balun circuit, it is characterised in that；Including first port, second port, the 3rd port, the first electric capacity, Two electric capacity, the 3rd electric capacity, the 4th electric capacity, the first inductance and the second inductance；The first port is single-ended port；The second port and a pair of ports that the 3rd port is differential ends；The capacitance of first electric capacity and the second electric capacity is identical；The capacitance of 3rd electric capacity and the 4th electric capacity is identical；The sensibility reciprocal value of first inductance and the second inductance is identical；The latter end ground connection of first electric capacity and the first inductance series connection, the other end are connected to first port；3rd electric capacity, the second inductance and second electric capacity are sequentially connected in series latter end ground connection, and the other end is connected to first port；The second port is connected to after being connected with the 4th electric capacity between first electric capacity and the first inductance；3rd port is connected between second electric capacity and the second inductance.
- 2. intermediate frequency balun circuit as claimed in claim 1, it is characterised in that：The capacitance C of first electric capacity, the first inductance Sensibility reciprocal value L, the capacitance Cb of the 3rd electric capacity meet following relation：<mrow> <mi>W</mi> <mi>L</mi> <mo>=</mo> <msqrt> <mrow> <mn>2</mn> <mo>&times;</mo> <mi>Z</mi> <mn>1</mn> <mo>&times;</mo> <mi>Z</mi> <mn>2</mn> </mrow> </msqrt> <mo>;</mo> </mrow><mrow> <mi>W</mi> <mi>C</mi> <mo>=</mo> <mfrac> <mn>1</mn> <msqrt> <mrow> <mn>2</mn> <mo>&times;</mo> <mi>Z</mi> <mn>1</mn> <mo>&times;</mo> <mi>Z</mi> <mn>2</mn> </mrow> </msqrt> </mfrac> <mo>;</mo> </mrow><mrow> <msub> <mi>X</mi> <mi>c</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mrow> <mi>W</mi> <mi>C</mi> <mi>b</mi> </mrow> </mfrac> <mo>;</mo> </mrow>W=2 π f；Above-mentioned formula, Z1 are the impedance of first port, and Z2 is the impedance of second port and the 3rd port, XcFor first electric capacity 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 the first electric capacity and the second electric capacity is 27pF, and the capacitance Cb of the 3rd electric capacity and the 4th electric capacity 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 the first electric capacity and the second electric capacity is 4.5pF, and the capacitance Cb of the 3rd electric capacity and the 4th electric capacity 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 the first electric capacity and the second electric capacity is 355pF, and the capacitance Cb of the 3rd electric capacity and the 4th electric capacity is 100nF。
- 7. the intermediate frequency balun circuit as described in claim 1-6 is any, it is characterised in that：First electric capacity, the second electric capacity, Three electric capacity, the 4th electric capacity, the first inductance and the second inductance are arranged on printed circuit board (PCB).
- 8. intermediate frequency balun circuit as claimed in claim 7, it is characterised in that：First electric capacity, the second electric capacity, the 3rd electricity Appearance, the 4th electric capacity, 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 the 3rd port is output port, input port signal is that amplitude is equal, phase difference 180 degree.
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| CN201720645917.6U CN206932205U (en) | 2017-06-06 | 2017-06-06 | A kind of intermediate frequency balun circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004913A (en) * | 2017-06-06 | 2018-12-14 | 北京握奇智能科技有限公司 | A kind of intermediate frequency balun circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004913A (en) * | 2017-06-06 | 2018-12-14 | 北京握奇智能科技有限公司 | A kind of intermediate frequency balun circuit |
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