CN216390912U - High-frequency broadband balun matching converter and radio frequency device - Google Patents
High-frequency broadband balun matching converter and radio frequency device Download PDFInfo
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- CN216390912U CN216390912U CN202122911047.1U CN202122911047U CN216390912U CN 216390912 U CN216390912 U CN 216390912U CN 202122911047 U CN202122911047 U CN 202122911047U CN 216390912 U CN216390912 U CN 216390912U
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/14—Balanced arrangements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
Abstract
The utility model provides a high-frequency broadband balun matching converter and a radio frequency device, which comprise a first-stage balun, a phase compensation capacitor and a second-stage balun which are connected in sequence; the first-stage balun is used for receiving the single-ended unbalanced signal, converting the single-ended unbalanced signal into two paths of balanced differential signals and outputting the two paths of balanced differential signals; the phase compensation capacitor is used for performing phase compensation on the two paths of balanced differential signals and then outputting the two paths of balanced differential signals; and the second-stage balun is used for receiving the two paths of balanced differential signals after phase compensation, improving the insertion loss, amplitude consistency and balance degree of the differential signals and outputting the signals. Compared with the prior art, the utility model can improve the phase balance degree and the amplitude balance degree of the differential signal, so that the phase difference of the finally output differential signal is closer to 180 degrees, the amplitude is more equal, and meanwhile, the output loss is reduced.
Description
Technical Field
The utility model relates to the technical field of radio frequency, in particular to a high-frequency broadband balun matching converter and a radio frequency device.
Background
With the advance of science and technology, the design of balun has also changed greatly, and the application field relates to driving differential antenna, balanced mixer, amplifier, frequency multiplier, etc. Some baluns have even-order signal rejection, which reduces spurious signals in the mixer, some for impedance transformation, and some for connecting transmission lines of different impedances. The balun for impedance variation enables impedance matching, blocking and balancing port to single ended matching.
Key indicators for balun are: insertion loss, amplitude uniformity, phase balance, and common mode rejection ratio.
1) Amplitude consistency refers to the difference between the two output powers;
2) the phase balance degree means that two balanced outputs are equal to power, and the phase difference is 180 degrees;
3) the common mode rejection ratio refers to the attenuation generated in the process of transmitting two identical signals from a balanced port to an unbalanced port, and is determined by the vector addition result of the two signals, and the vector addition result is determined by the amplitude consistency and the phase balance degree of the balun.
In the microwave radio frequency field, a differential circuit and a balun are widely applied to communication base station products, mobile products and chip design, common mode noise is generally eliminated by using differential signals, and conversion between single-ended signals and differential signals is realized by using the balun.
Nowadays, radio frequency and microwave integrated circuits are developing towards broadband and miniaturization, while the development of 5G has become the trend of the times, and in order to meet the communication experience of users, intelligent terminals must have relevant capabilities.
The balun which is an important link needs to be correspondingly improved and advanced, and the traditional balun has loss due to structural limitation, and needs to be improved in matching, so that the problems of phase imbalance, amplitude imbalance and overhigh output loss can occur during differential signal output, and the performance of the balun is seriously influenced.
SUMMERY OF THE UTILITY MODEL
In view of the above deficiencies of the prior art, embodiments of the present invention provide a high-frequency broadband balun matching converter and a radio frequency device for improving phase balance and amplitude balance of a differential signal and reducing output loss.
In a first aspect, an embodiment of the present invention provides a high-frequency broadband balun matching converter, including a first-stage balun, a phase compensation capacitor, and a second-stage balun, which are connected in sequence;
the first-stage balun is used for receiving the single-ended unbalanced signal, converting the single-ended unbalanced signal into two paths of balanced differential signals and outputting the two paths of balanced differential signals;
the phase compensation capacitor is used for performing phase compensation on the two paths of balanced differential signals and then outputting the two paths of balanced differential signals;
and the second-stage balun is used for receiving the two paths of balanced differential signals after phase compensation, improving the insertion loss, amplitude consistency and balance degree of the differential signals and outputting the signals.
Preferably, the first stage balun includes a first coupling unit, the first coupling unit includes a first transmission line and a first coupling line coupled to the first transmission line, the first transmission line and the first coupling line are parallel to each other and are disposed opposite to each other, one end of the first transmission line serves as a first signal input end of the first stage balun and is configured to receive the single-ended unbalanced signal, and the other end of the first transmission line serves as a first output end of the first stage balun and is connected to the phase compensation capacitor; one end of the first coupling line is grounded, and the other end of the first coupling line is used as a second output end of the first-stage balun and is connected to the phase compensation capacitor.
Preferably, the input terminals of the second stage balun include a second signal input terminal and a third signal input terminal; the phase compensation capacitor comprises a first capacitor and a second capacitor, wherein a first end of the first capacitor is connected with the first output end, a second end of the first capacitor is connected with the second signal input end, a first end of the second capacitor is connected with the second output end, and a second end of the second capacitor is connected with the third signal input end.
Preferably, the second-stage balun includes a second coupling unit and a third coupling unit; the second coupling unit comprises two second transmission lines which are parallel to each other and are arranged oppositely and two second coupling lines which are parallel to each other and are arranged oppositely, and the second transmission lines and the second coupling lines are parallel to each other and are arranged oppositely;
one ends of the two second transmission lines, which are positioned on the same side, are connected with each other and are used as second signal input ends, and one ends of the two second transmission lines, which are positioned on the other same side, are connected with each other and are used as third output ends;
one ends of the two second coupling lines which are positioned on the same side are mutually connected and used as a fourth output end; one ends of the two second coupling lines which are positioned on the other same side are grounded together;
the third coupling unit comprises two third transmission lines which are parallel to each other and are arranged oppositely and two third coupling lines which are parallel to each other and are arranged oppositely, and the third transmission lines and the third coupling lines are parallel to each other and are arranged oppositely;
one ends of the two third transmission lines, which are positioned on the same side, are connected with each other and are used as the third signal input ends, and one ends of the two third transmission lines, which are positioned on the other same side, are connected with the fourth output end;
and one ends of the two third coupling lines positioned on the same side are mutually connected and are connected with the third output end, and one ends of the two third coupling lines positioned on the other same side are commonly grounded.
Preferably, the high-frequency broadband balun matching converter further includes a third capacitor, and the third capacitor is connected to the second-stage balun and is used for adjusting a working frequency point of the differential signal, where the balance degree is improved by the second-stage balun.
Preferably, the third capacitor is serially connected between the third output terminal and the fourth output terminal.
Preferably, the first capacitor, the second capacitor and the third capacitor are all adjustable capacitors.
Preferably, the first transmission line and the first coupling line have the same length and the same shape; the second transmission line, the third transmission line, the second coupling line and the third coupling line have the same length and the same shape.
Preferably, the lengths of the first transmission line and the first coupling line are both 1300um at the working frequency of 3.3-4.2G; the lengths of the second transmission line, the second coupling line, the third transmission line and the third coupling line are 650um at the working frequency of 3.3G-4.2G
In a second aspect, an embodiment of the present invention further provides a radio frequency device, where the radio frequency device includes the above-mentioned high-frequency broadband balun matching transformer; the radio frequency device is any one of a mixer, a push-pull amplifier, a duplexer and a frequency multiplier.
Compared with the prior art, in the high-frequency broadband balun matching converter and the radio frequency device, the unbalanced signal is converted into the differential signal through the first-stage balun by arranging the first-stage balun and the second-stage balun, and then the differential signal generated by the first-stage balun is improved through the second-stage balun, so that the phase balance degree and the amplitude balance degree of the differential signal are improved, the phase difference of the finally output differential signal is closer to 180 degrees, the amplitude is more equal, and meanwhile, the output loss is reduced.
Drawings
The present invention will be described in detail below with reference to the accompanying drawings. The foregoing and other aspects of the utility model will become more apparent and more readily appreciated from the following detailed description, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a first circuit block diagram of a high-frequency broadband balun matching converter according to an embodiment of the present invention;
fig. 2 is a circuit block diagram ii of a high-frequency broadband balun matching converter according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a high-frequency broadband balun matching converter according to an embodiment of the present invention;
FIG. 4 is a simulation graph of the insertion loss of balun between 3.3G and 4.2G in the embodiments of the present invention and the prior art;
FIG. 5 is a simulation graph of the amplitude consistency of the balun between 3.3G and 4.2G in the embodiments of the present invention and the prior art;
FIG. 6 is a simulation curve of the phase balance between 3.3G and 4.2G of balun in the embodiment of the present invention and the prior art.
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings.
The embodiments/examples described herein are specific embodiments of the present invention, are intended to be illustrative of the concepts of the present invention, are intended to be illustrative and exemplary, and should not be construed as limiting the embodiments and scope of the utility model. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the utility model claims and the specification, and these technical solutions include those which can make any obvious replacement or modification to the embodiments described herein, and all fall within the scope of the present invention.
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the utility model may be practiced. Directional phrases used herein, such as, for example, upper, lower, front, rear, left, right, inner, outer, lateral, and the like, refer only to the orientation of the appended drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.
Fig. 1 to fig. 3 are schematic circuit diagrams of a high-frequency broadband balun matching converter according to an embodiment of the present invention.
The high-frequency broadband balun matching converter provided by the embodiment of the utility model comprises a first-stage balun 10, a phase compensation capacitor 30 and a second-stage balun 20 which are sequentially connected.
The first-stage balun 10 is configured to receive a single-ended unbalanced signal, convert the single-ended unbalanced signal into two paths of balanced differential signals, and output the two paths of balanced differential signals.
The phase compensation capacitor 30 is configured to perform phase compensation on the two paths of balanced differential signals and then output the two paths of balanced differential signals.
The second-stage balun 20 is configured to receive the two paths of balanced differential signals after phase compensation, improve insertion loss, amplitude consistency, and a balance degree of the differential signals, and output the signals, where the balance degree is mainly represented as a phase balance degree and an amplitude balance degree.
Specifically, the first stage balun 10 includes a first coupling unit 11, the first coupling unit 11 includes a first transmission line 1 and a first coupling line 2 coupled to the first transmission line 1, the first transmission line 1 and the first coupling line 2 are parallel to each other and are disposed opposite to each other, one end of the first transmission line 1 serves as a first signal input terminal T1 of the first stage balun 10 and is configured to receive the single-ended unbalanced signal, and the other end of the first transmission line 1 serves as a first output terminal T2 of the first stage balun 10 and is connected to the phase compensation capacitor 30; one end of the first coupling line 2 is grounded, and the other end of the first coupling line 2 is used as a second output end T3 of the first-stage balun 10 and is connected to the phase compensation capacitor 30.
In particular, the inputs of the second stage balun 20 comprise a second signal input T4 and a third signal input T5; the phase compensation capacitor 30 includes a first capacitor C1 and a second capacitor C2, a first end of the first capacitor C1 is connected to the first output terminal T2, a second end of the first capacitor C1 is connected to the second signal input terminal T4, a first end of the second capacitor C2 is connected to the second output terminal T3, and a second end of the second capacitor C2 is connected to the third signal input terminal T5.
In particular, the second-stage balun 20 comprises a second coupling unit 21 and a third coupling unit 22; the second coupling unit 21 includes two second transmission lines a parallel to each other and disposed opposite to each other, and two second coupling lines b parallel to each other and disposed opposite to each other, and the second transmission lines a and the second coupling lines b are parallel to each other and disposed opposite to each other;
one ends of the two second transmission lines a on the same side are connected with each other and serve as the second signal input end T4, and one ends of the two second transmission lines a on the other same side are connected with each other and serve as a third output end T8;
one ends of the two second coupled lines b on the same side are connected with each other and used as a fourth output end T9; one ends of the two second coupling lines b positioned on the other same side are grounded together;
the third coupling unit 22 includes two third transmission lines c parallel to each other and disposed opposite to each other, and two third coupling lines d parallel to each other and disposed opposite to each other, and the third transmission lines c and the third coupling lines d are parallel to each other and disposed opposite to each other;
one ends of the two third transmission lines c on the same side are connected with each other and serve as the third signal input end T5, and one ends of the two third transmission lines c on the other same side are both connected with the fourth output end T9;
the ends of the two third coupled lines d on the same side are connected to each other and to the third output terminal T8, and the ends of the two third coupled lines d on the other same side are grounded together.
Specifically, the high-frequency broadband balun matching converter further includes a third capacitor C3, and the third capacitor C3 is connected to the second-stage balun 20 and is used for adjusting a working frequency point of the differential signal, which is improved in balance by the second-stage balun 20.
Specifically, the third capacitor C3 is serially disposed between the third output terminal T8 and the fourth output terminal T9. Therefore, the working frequency point of the balun can be adjusted through the third capacitor C3, and the trend is that the larger the capacitor is, the lower the frequency is, and the smaller the capacitor is, the higher the frequency is.
The size of the balun size can cause the change of the working frequency, but the frequency modulation effect can be realized by adjusting the third capacitor C3, and if the balun size is just suitable for the required frequency band, the balun performance can be improved to a certain extent by adjusting the third capacitor C3.
In this embodiment, the second stage balun 20 further includes a first differential output terminal T6 and a second differential output terminal T7, the first differential output terminal T6 is connected to the third output terminal T8, and the second differential output terminal T7 is connected to the fourth output terminal T9. This facilitates the output of the signal.
In this embodiment, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are all adjustable capacitors. Therefore, the working frequency point of the balun can be adjusted, and the insertion loss and the phase of the balun are mainly influenced.
In this embodiment, the first transmission line 1 and the first coupled line 2 have the same length and the same shape; the second transmission line a, the third transmission line c, the second coupling line b and the third coupling line d have the same length and the same shape. Therefore, the phase balance degree and the amplitude balance degree of the balun can be improved.
In this embodiment, the lengths of the first transmission line 1 and the first coupling line 2 are both 1300um at the operating frequency of 3.3G to 4.2G; the lengths of the second transmission line a, the second coupling line b, the third transmission line c and the third coupling line d are 650um at the working frequency of 3.3G-4.2G. Therefore, the area of the balun is smaller, the application range is wider, the phase balance degree and the amplitude balance degree of the differential signals can be improved, the phase difference of the finally output differential signals is closer to 180 degrees, the amplitudes are more equal, and the insertion loss of the output is reduced.
The most important factor influencing the working frequency band and the working bandwidth of the balun is the length of the coupling coil, in other words, the larger the area is, the more the balun can meet the working requirement at low frequency, and the smaller the area is, the higher the working frequency is. The coupling coil is the length of the first coupling line 2, the second coupling line b and the third coupling line d.
In use, an input unbalanced signal is input to the first transmission line 1 from the first signal input terminal T1 of the first coupling unit 11, and is coupled to the first coupled line 2, thereby generating a differential signal. I.e. two signals with phase difference of 180 ° and equal amplitude can be output, a first signal input terminal T1, a first output terminal T2 and a second output terminal T3 are required in the first stage balun 10.
The two balanced differential signals are transmitted from the first output terminal T2 and the second output terminal T3 to the second signal input terminal T4 and the third signal input terminal T5 through the first capacitor C1 and the second capacitor C2, respectively, and then processed by the second coupling unit 21 and the third coupling unit 22, and the processed signals are transmitted to the first differential output terminal T6 and the second differential output terminal T7 through the third output terminal T8 and the fourth output terminal T9, respectively. Therefore, the second signal input terminal T4 and the third signal input terminal T5 need to be arranged in the second stage balun 20, and after the differential signal is processed by the second signal input terminal T4 and the third signal input terminal T5, the bandwidth, insertion loss, amplitude consistency and phase balance of the output differential signal can be greatly improved.
After the input signal of the present invention enters the first stage balun 10 from the first signal input terminal T1, since the coupled line is affected by metal loss, dielectric loss and parasitic parameters in practical applications, the amplitude of the signal may be attenuated and the phase of the signal may be delayed in the transmission process, which may cause a deviation in the consistency of the amplitude and the phase when the signal is transmitted to the first output terminal T2 and the second output terminal T3 through the first coupling unit 11.
After the output signal of the first-stage balun 10 is transmitted to the second-stage balun 20 through the first capacitor C1 and the second capacitor C2, firstly, the introduction of the first capacitor C1 and the second capacitor C2 can compensate the deviation to a certain extent, secondly, the introduction of the second-stage balun 20 enables signal transmission paths in the second coupling unit 21 and the third coupling unit 22 to be completely symmetrical, and the influences of metal loss, dielectric loss and parasitic parameters generated by the signal in the first-stage balun 10 and the influences of metal loss, dielectric loss and parasitic parameters generated in the second-stage balun 20 can be offset, so that the consistency of the amplitude and the phase of the balun structure of the utility model can be greatly improved compared with that of the traditional balun structure, and meanwhile, the performance of the balun structure in a 5G frequency band is guaranteed.
In order to better understand the technical effects brought by the high-frequency broadband balun matching converter of the present invention, this embodiment further provides a simulation curve of the insertion loss of the balun between 3.3G and 4.2G in the embodiments of the present invention and the prior art, a simulation curve of the amplitude consistency of the balun between 3.3G and 4.2G in the embodiments of the present invention and the prior art, and a simulation curve of the phase balance of the balun between 3.3G and 4.2G in the embodiments of the present invention and the prior art.
Wherein, a simulation curve chart of the insertion loss of the balun between 3.3G and 4.2G in the embodiment of the utility model and the prior art is shown in fig. 4; the simulation curve graph of the amplitude consistency of the balun in the embodiment of the utility model and the balun in the prior art is shown in FIG. 5; the simulation curve of the balun in the embodiment of the utility model and the prior art at the phase balance degree of 3.3G-4.2G is shown in fig. 6.
Compared with the prior art, the high-frequency broadband balun matching converter provided by the utility model has the advantages that the first-stage balun 10 and the second-stage balun 20 are arranged, so that after an unbalanced signal is converted into a differential signal through the first-stage balun 10, the differential signal generated by the first-stage balun 10 is improved through the second-stage balun 20, the phase balance degree and the amplitude balance degree of the differential signal are improved, the phase difference of the finally output differential signal is closer to 180 degrees, the amplitude is more equal, and meanwhile, the output loss is reduced.
The high-frequency broadband balun matching converter can be applied to a radio frequency device, wherein the radio frequency device comprises one of a mixer, a push-pull amplifier, a duplexer and a frequency multiplier, and the achieved effect is the same as that achieved by the high-frequency broadband balun matching converter, so that the details are not repeated. Of course, the high-frequency broadband balun matching transformer can also be applied to other radio frequency devices according to actual requirements.
It should be noted that the above-mentioned embodiments described with reference to the drawings are only intended to illustrate the present invention and not to limit the scope of the present invention, and it should be understood by those skilled in the art that modifications and equivalent substitutions can be made without departing from the spirit and scope of the present invention. Furthermore, unless the context indicates otherwise, words that appear in the singular include the plural and vice versa. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.
Claims (10)
1. A high-frequency broadband balun matching converter is characterized by comprising a first-stage balun, a phase compensation capacitor and a second-stage balun which are sequentially connected;
the first-stage balun is used for receiving the single-ended unbalanced signal, converting the single-ended unbalanced signal into two paths of balanced differential signals and outputting the two paths of balanced differential signals;
the phase compensation capacitor is used for performing phase compensation on the two paths of balanced differential signals and then outputting the two paths of balanced differential signals;
and the second-stage balun is used for receiving the two paths of balanced differential signals after phase compensation, improving the insertion loss, amplitude consistency and balance degree of the differential signals and outputting the signals.
2. The high-frequency broadband balun matching transformer according to claim 1, wherein the first stage balun comprises a first coupling unit, the first coupling unit comprises a first transmission line and a first coupling line coupled with the first transmission line, the first transmission line and the first coupling line are parallel to each other and are arranged opposite to each other, one end of the first transmission line is used as a first signal input end of the first stage balun and is used for receiving the single-ended unbalanced signal, and the other end of the first transmission line is used as a first output end of the first stage balun and is connected to the phase compensation capacitor; one end of the first coupling line is grounded, and the other end of the first coupling line is used as a second output end of the first-stage balun and is connected to the phase compensation capacitor.
3. The high frequency broadband balun matched converter of claim 2, wherein the input terminals of the second stage of baluns comprise a second signal input terminal and a third signal input terminal; the phase compensation capacitor comprises a first capacitor and a second capacitor, wherein a first end of the first capacitor is connected with the first output end, a second end of the first capacitor is connected with the second signal input end, a first end of the second capacitor is connected with the second output end, and a second end of the second capacitor is connected with the third signal input end.
4. The high frequency broadband balun matching transformer of claim 3, wherein the second stage balun includes a second coupling element and a third coupling element; the second coupling unit comprises two second transmission lines which are parallel to each other and are arranged oppositely and two second coupling lines which are parallel to each other and are arranged oppositely, and the second transmission lines and the second coupling lines are parallel to each other and are arranged oppositely;
one ends of the two second transmission lines, which are positioned on the same side, are connected with each other and are used as second signal input ends, and one ends of the two second transmission lines, which are positioned on the other same side, are connected with each other and are used as third output ends;
one ends of the two second coupling lines which are positioned on the same side are mutually connected and used as a fourth output end; one ends of the two second coupling lines which are positioned on the other same side are grounded together;
the third coupling unit comprises two third transmission lines which are parallel to each other and are arranged oppositely and two third coupling lines which are parallel to each other and are arranged oppositely, and the third transmission lines and the third coupling lines are parallel to each other and are arranged oppositely;
one ends of the two third transmission lines, which are positioned on the same side, are connected with each other and are used as the third signal input ends, and one ends of the two third transmission lines, which are positioned on the other same side, are connected with the fourth output end;
and one ends of the two third coupling lines positioned on the same side are mutually connected and are connected with the third output end, and one ends of the two third coupling lines positioned on the other same side are commonly grounded.
5. The high-frequency broadband balun matching converter according to claim 4, further comprising a third capacitor connected to the second stage balun for adjusting a working frequency of the differential signal for improving balance via the second stage balun.
6. The high frequency broadband balun matching converter of claim 5, wherein the third capacitor is disposed in series between the third output terminal and the fourth output terminal.
7. The high frequency broadband balun matching transformer of claim 6, wherein the first capacitance, the second capacitance and the third capacitance are all adjustable capacitances.
8. The high frequency broadband balun matching transformer of claim 4, wherein the first transmission line and the first coupled line are the same length and are uniform in shape; the second transmission line, the third transmission line, the second coupling line and the third coupling line have the same length and the same shape.
9. The high-frequency broadband balun matching transformer of claim 8, wherein the lengths of the first transmission line and the first coupling line are 1300um at the working frequency of 3.3G-4.2G; the length of the second transmission line, the second coupling line, the third transmission line and the third coupling line is 650um at the working frequency of 3.3G-4.2G.
10. A radio frequency device, characterized in that the radio frequency device comprises a high-frequency broadband balun matching transformer according to any one of claims 1 to 9; the radio frequency device is any one of a mixer, a push-pull amplifier, a duplexer and a frequency multiplier.
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| CN202122911047.1U CN216390912U (en) | 2021-11-24 | 2021-11-24 | High-frequency broadband balun matching converter and radio frequency device |
| PCT/CN2022/125269 WO2023093349A1 (en) | 2021-11-24 | 2022-10-14 | High-frequency broadband balun matching transformer, and radio frequency device |
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| WO2023093349A1 (en) * | 2021-11-24 | 2023-06-01 | 深圳飞骧科技股份有限公司 | High-frequency broadband balun matching transformer, and radio frequency device |
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| US5867072A (en) * | 1997-07-29 | 1999-02-02 | Merrimac Industries, Inc. | Biphase modulator with balun design |
| CN111130469B (en) * | 2019-11-15 | 2023-03-10 | 西安电子科技大学 | Broadband CMOS second-order active balun amplifier |
| CN112073023A (en) * | 2020-09-02 | 2020-12-11 | 成都芯川电子有限公司 | Novel broadband high-balance balun |
| CN216390912U (en) * | 2021-11-24 | 2022-04-26 | 深圳飞骧科技股份有限公司 | High-frequency broadband balun matching converter and radio frequency device |
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| WO2023093349A1 (en) * | 2021-11-24 | 2023-06-01 | 深圳飞骧科技股份有限公司 | High-frequency broadband balun matching transformer, and radio frequency device |
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