CN217590768U - Balance-unbalance converter - Google Patents
Balance-unbalance converter Download PDFInfo
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- CN217590768U CN217590768U CN202221422579.7U CN202221422579U CN217590768U CN 217590768 U CN217590768 U CN 217590768U CN 202221422579 U CN202221422579 U CN 202221422579U CN 217590768 U CN217590768 U CN 217590768U
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Abstract
The utility model discloses a balanced unbalanced transformer belongs to broadband LCBalun technical field, including six inductance, six electric capacity, port 1, 2 and 3 and reference ground, wherein, first, second and third electric capacity are established ties in proper order between terminal 1 and 2, and first inductance is connected between the tie point of first and second electric capacity and reference ground, and the second inductance is connected between the tie point of second and third electric capacity and reference ground, and the third inductance is connected between terminal 2 and reference ground; a fourth, a fifth and a sixth inductance are in turn connected in series between terminals 1 and 3, a fourth capacitance is connected between the junction of the fourth and fifth inductances and the reference ground, a fifth capacitance is connected between the junction of the fifth and sixth inductances and the reference ground, and a sixth capacitance is connected between terminal 3 and the reference ground. Use the relative bandwidth of Balun case of the design of the utility model is 71.9%, realized miniaturized broadband Balun design.
Description
Technical Field
The utility model relates to a broadband LC Balun technical field, in particular to balanced unbalanced transformer.
Background
Balun is a device for converting a balanced signal into an unbalanced (single-ended) signal or converting an unbalanced (single-ended) signal into a balanced signal (differential signal), and has a wide application in modern communication systems, such as balanced mixers, push-pull amplifiers, differential low-noise amplifiers, and antenna feed networksBalun is to be used. Since modern communication systems are developed to have a wide bandwidth and a small size, the design direction of Balun in the industry is also a wide bandwidth, a small size, and a planar structure. The industry generally uses a first-order Lattice LC Balun, and the LC Balun circuit is simple but only at the central frequency point f 0 The best Balun characteristic is achieved, and the bandwidth is very narrow.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a balanced unbalanced transformer to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: the balanced-to-unbalanced converter is characterized by comprising six inductors, six capacitors, ports 1, 2 and 3 and a reference ground G, wherein the ports 1, 2 and 3 are externally connected ports and are all unbalanced ports and respectively composed of terminals 1 and 1', terminals 2 and 2' and terminals 3 and 3 '; terminals 1', 2' and 3' are all connected to a reference ground G; meanwhile, the terminals 2 and 3 form a balance port;
the port 1, the port 2 and the port 3 are connected with a balun formed by an inductor L, a capacitor C and a reference ground G;
the inductor L in the balun comprises an inductor L 1 Inductor L 2 Inductor L 3 Inductor L 4 Inductor L 5 And an inductance L 6 ；
The capacitor C in the balun comprises a capacitor C 1 Capacitor C 2 Capacitor C 3 Capacitor C 4 Capacitor C 5 And a capacitor C 6 ；
Capacitor C 1 Is electrically connected to the terminal 1, and the other end is connected to the capacitor C 2 Is electrically connected to a terminal of a capacitor C 2 Another terminal of (1) and a capacitor C 3 One terminal of the capacitor C is electrically connected 3 The other end of the terminal is electrically connected with the terminal 2;
inductor L 1 One terminal of (A) and a capacitor C 1 And a capacitor C 2 The other end of the connecting point is electrically connected with the ground reference;
inductor L 2 One terminal of and a capacitor C 2 Electrically connected to the connection point of the capacitor C3The other end of the ground is electrically connected with the reference ground;
inductor L 3 One end of which is electrically connected to the terminal 2 and the other end of which is electrically connected to a reference ground;
inductor L 4 Is electrically connected to the terminal 1, and the other end is connected to the inductor L 5 One end of which is electrically connected with an inductor L 5 Another end of (1) and an inductor L 6 One end of which is electrically connected with an inductor L 6 The other end of which is electrically connected with the terminal 3;
capacitor C 4 One end of (1) and an inductor L 4 And an inductance L 5 The other end of the connecting point is electrically connected with the ground reference;
capacitor C 5 One end of (A) and an inductor L 5 And L 6 The other end of the connection point is electrically connected with the ground reference;
capacitor C 6 One end of which is electrically connected to the terminal 3 and the other end of which is electrically connected to a reference ground;
when the balun works, the external load impedance Z of the utility model comprises the balanced load impedance R of the balanced port B And the load impedance R of the unbalanced port UN Wherein R is B And R UN Resistance value R of B And R UN Are all real numbers.
Balanced load impedance R of balanced port B Electrically connected to terminals 2 and 3;
unbalanced port load impedance RUN is electrically connected to terminals 1 and 1'.
Further, the center frequency of the balun to be designed is f 0 . The utility model provides an inductance value and capacitance value must satisfy following relation:
compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a broadband balun that miniaturized, plane, the LC that uses lumped parameter constitutes has only used lumped parameter inductance L and electric capacity C to do not need extra mutual inductance components and parts, simplified the complexity of design, realized the broadband and the miniaturization of component. The utility model discloses have broadband working property, the relative frequency bandwidth of the balun that realizes in the implementation case reaches 71.9%. Additionally, the utility model discloses when realizing balun function, still realized load impedance matching function, consequently, used the utility model discloses a wireless communication system need not extra impedance matching components and parts, and this system size can further reduce.
Drawings
FIG. 1 is a schematic diagram of Balun of the present invention, wherein the unbalanced system connected to the outside by the unbalanced port presents R as the (single-ended) load impedance of the unbalanced port UN A balanced system with balanced ports connected to the outside presents a balanced (differential) load impedance at the balanced ports of R B ；
Fig. 2 is a simulation result of dBS11 of the unbalanced port in the operating band range according to the first embodiment of the present invention;
fig. 3 is a simulation result of the output port balance signal amplitude imbalance in the working frequency band range according to the first embodiment of the present invention;
fig. 4 is a simulation result of the phase difference of the balanced signal at the output port of the first embodiment of the present invention within the operating frequency band.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the balun is characterized by including six inductors, six capacitors, ports 1, 2, and 3, and a reference ground G, where the ports 1, 2, and 3 are external connection ports and are all unbalanced ports, and are respectively formed by terminals 1 and 1', terminals 2 and 2', and terminals 3 and 3 '; terminals 1', 2' and 3' are all connected to a reference ground G; meanwhile, the terminals 2 and 3 form a balance port;
the port 1, the port 2 and the port 3 are connected with a balun formed by an inductor L, a capacitor C and a reference ground G;
the inductor L in the balun comprises an inductor L 1 Inductor L 2 Inductor L 3 Inductor L 4 Inductor L 5 And an inductance L 6 ；
The capacitor C in the balun comprises a capacitor C 1 Capacitor C 2 Capacitor C 3 Capacitor C 4 Capacitor C 5 And a capacitor C 6 ；
Capacitor C 1 Is electrically connected to the terminal 1, and the other end is connected to the capacitor C 2 One terminal of the capacitor C is electrically connected 2 Another terminal of (1) and a capacitor C 3 One terminal of the capacitor C is electrically connected 3 The other end of the terminal is electrically connected with the terminal 2;
inductor L 1 One terminal of and a capacitor C 1 And a capacitor C 2 The other end of the connecting point is electrically connected with the ground reference;
inductor L 2 One terminal of and a capacitor C 2 The other end of the capacitor C3 is electrically connected with the ground reference;
inductor L 3 One end of which is electrically connected to the terminal 2 and the other end of which is electrically connected to a reference ground;
inductor L 4 Is electrically connected to the terminal 1, and the other end is connected to the inductor L 5 One end of which is electrically connected with an inductor L 5 Another end of (1) and an inductor L 6 Terminal electrical performance ofConnection, inductance L 6 The other end of which is electrically connected with the terminal 3;
capacitor C 4 One end of (1) and an inductor L 4 And an inductance L 5 The other end of the connecting point is electrically connected with the ground reference;
capacitor C 5 One end of (1) and an inductor L 5 And L 6 The other end of the connecting point is electrically connected with the ground reference;
capacitor C 6 One end of which is electrically connected to terminal 3 and the other end of which is electrically connected to ground reference;
when the balun works, the external load impedance Z of the utility model comprises the balanced load impedance R of the balanced port B And load impedance R of unbalanced port UN Wherein R is B And R UN Resistance value R of B And R UN Are all real numbers.
Balanced load impedance R of balanced port B Electrically connected to terminals 2 and 3;
unbalanced port load impedance RUN is electrically connected to terminals 1 and 1'.
Use the utility model discloses, treat to design balanced unbalanced transformer central frequency to be f 0 . The utility model provides an inductance value and capacitance value must satisfy following relation:
the first embodiment is as follows: balanced-unbalanced converter with central working frequency of 3.8GHz and balanced and unbalanced port load impedances of 100 omega and 50 omega respectively
The following parameters are calculated according to the design method
L 1 ＝4.1883nH，L 2 ＝L 3 ＝7.1499nH，L 4 ＝L 5 ＝1.2267nH，L 6 ＝2.0941nH，C 1 ＝C 2 ＝1.4300pF，C 3 ＝0.8377pF，C 4 ＝0.4188pF，C 5 ＝C 6 ＝0.2453pF。
From the above parameters, in accordance with the design method, it can be seen from FIG. 2 that dBS (1, 1) < -10dB and the frequency range is 2.608-5.536GHz in accordance with the design method.
As can be seen from fig. 3, | dBS (2, 1) -dBS (3, 1) | <1.5dB, frequency range is 2.566-5.628GHz according to the design method.
As can be seen from fig. 4, | phase (S (2, 1)) -phase (S (3, 1)) | -180 ° | <20 ° in the frequency range of 2.324-6.214GHz according to the design method.
In conclusion: the utility model discloses inductance L and electric capacity C that use lumped parameter constitute miniaturized broadband LC Balun, use the utility model provides a this balanced unbalanced transformer case of design method design, its relative bandwidth reaches 71.9%, has realized the miniaturized Balun of broadband.
The above description is only the specific implementation manner of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the design of the present invention within the technical scope of the present invention.
Claims (2)
1. The balanced-to-unbalanced converter is characterized by comprising six inductors, six capacitors, ports 1, 2 and 3 and a reference ground G, wherein the ports 1, 2 and 3 are externally connected ports and are all unbalanced ports and respectively composed of terminals 1 and 1', terminals 2 and 2' and terminals 3 and 3 '; the terminals 1', 2' and 3' are all connected with a reference ground G; meanwhile, the terminals 2 and 3 form a balance port;
the port 1, the port 2 and the port 3 are connected with a balun consisting of an inductor L, a capacitor C and a reference ground G;
the inductor L in the balun comprises an inductor L 1 An inductor L 2 An inductor L 3 An inductor L 4 An inductor L 5 And an inductance L 6 ；
The capacitor C in the balun comprises a capacitor C 1 Capacitor C 2 Capacitor C 3 Capacitor C 4 Capacitor C 5 And a capacitor C 6 ；
Capacitor C 1 Is electrically connected to terminal 1, and the other end is connected to capacitor C 2 Is electrically connected to a terminal of a capacitor C 2 Another terminal of (2) and a capacitor C 3 One terminal of the capacitor C is electrically connected 3 The other end of the terminal is electrically connected with the terminal 2;
inductor L 1 One terminal of (A) and a capacitor C 1 And a capacitor C 2 The other end of the connecting point is electrically connected with the ground reference;
inductor L 2 One terminal of and a capacitor C 2 The other end of the capacitor C3 is electrically connected with the ground reference;
inductor L 3 One end of which is electrically connected to the terminal 2 and the other end of which is electrically connected to a reference ground;
inductor L 4 Is electrically connected to the terminal 1, and the other end is connected to the inductor L 5 One end of which is electrically connected with an inductor L 5 Another end of (1) and an inductor L 6 Is electrically connected to one end of an inductor L 6 The other end of which is electrically connected with the terminal 3;
capacitor C 4 One end of (1) and an inductor L 4 And an inductance L 5 The other end of the connecting point is electrically connected with the ground reference;
capacitor C 5 One end of (1) and an inductor L 5 And L 6 The other end of the connection point is electrically connected with the ground reference;
capacitor C 6 One end of which is electrically connected to the terminal 3 and the other end of which is electrically connected to a reference ground;
when the balun is in actual operation, the external load impedance Z comprises a balanced load impedance R of a balanced port B And load impedance R of unbalanced port UN Wherein R is B And R UN Resistance value R of B And R UN Are all real numbers;
balanced load impedance R of balanced port B Electrically connected to terminals 2 and 3;
unbalanced port load impedance R UN Electrically connected to terminals 1 and 1'.
2. Balun transformer according to claim 1, characterized in that the central operating frequency f of the balun transformer is 0 Then ω is 0 ＝2×π×f 0 The inductance and capacitance values must satisfy the following relationship:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221422579.7U CN217590768U (en) | 2022-06-08 | 2022-06-08 | Balance-unbalance converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221422579.7U CN217590768U (en) | 2022-06-08 | 2022-06-08 | Balance-unbalance converter |
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| Publication Number | Publication Date |
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| CN217590768U true CN217590768U (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221422579.7U Active CN217590768U (en) | 2022-06-08 | 2022-06-08 | Balance-unbalance converter |
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- 2022-06-08 CN CN202221422579.7U patent/CN217590768U/en active Active
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