A broadband impedance converter and electronic equipment

Abstract

The present invention relates to a broadband impedance converter and electronic equipment, belonging to the technical field of integrated circuits. It includes N coupling units, each coupling unit includes at least two coupling coil pairs; the first input ends of the N coupling units are connected as the first differential signal input end, and the second input ends of the N coupling units are connected as the second differential signal input end; the i-th coupling unit and the N+1-i-th coupling unit are the i-th group of coupling unit pairs with completely the same performance; the first output end of one coupling unit in the k-th group of coupling unit pairs is used as the first differential signal output end, and the second output end of the other coupling unit is used as the second differential signal output end; the output ends of the coupling units that are not used as the first differential signal output end and the second differential signal output end in the N coupling units are connected as a common end; the broadband impedance converter provided by the present invention has good broadband performance.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to a wide-band impedance converter and electronic equipment. Background Art

[0002] Impedance transformers have high stability and are better suited for demanding application scenarios, such as high-frequency signal processing and high-power signal transmission. Therefore, they play a key role in modern wireless communications, radar systems, and satellite communications.

[0003] Traditional impedance converters are designed with passive components such as LC, and use inductors and capacitors to build impedance converters. Different impedance conversion ratios are achieved by adjusting the parameters of inductors and capacitors. However, due to the response changes of components such as inductors and capacitors at different frequencies, the impedance matching performance of the device will fail in certain frequency bands, which will lead to a narrow working frequency band and poor bandwidth performance of the device. In order to solve this problem, coupled coils are gradually being used to design impedance converters. Different impedance conversion ratios are achieved by changing the characteristic impedance of the coupled coils. Since the coupled coils have smaller parasitic effects and good electromagnetic compatibility, this type of impedance converter has better bandwidth performance than the LC type impedance converter. However, the coupled coil type impedance converter is limited by electromagnetics and structure in design. The number and connection relationship of the coupled coils will affect the coupling effect between the coupled coils, thereby affecting the working frequency band of the device, and then affecting its bandwidth performance. The coupled coil type impedance converter in the prior art still has the problem of narrow working frequency band and poor bandwidth performance, which results in the impedance converter being unable to provide a stable impedance conversion ratio in high-frequency applications.

[0004] In summary, the existing wide-band impedance transformer has the problem of poor bandwidth performance and cannot provide a stable impedance transformation ratio in high-frequency applications. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the impedance transformer in the prior art has poor bandwidth performance and cannot provide a stable impedance transformation ratio in high-frequency applications.

[0006] In order to solve the above technical problems, the present invention provides a wideband impedance converter, comprising:

[0007] coupling units, each coupling unit includes at least two coupling coil pairs, each coupling coil pair includes a first coupling coil and a second coupling coil; in each coupling unit, the first end of the first coupling coil in the first coupling coil pair is the first input end of the coupling unit, the first end of the second coupling coil in the first coupling coil pair is the second input end of the coupling unit, the second end of the first coupling coil in the last coupling coil pair is the first output end of the coupling unit, and the second end of the second coupling coil in the last coupling coil pair is the second output end of the coupling unit; wherein, is an even number;

[0008] The first input ends of the N coupling units are connected to serve as the first differential signal input end of the wide-band impedance converter; the second input ends of the N coupling units are connected to serve as the second differential signal input end of the wide-band impedance converter;

[0009] The i-th coupling unit and the N+1-i-th coupling unit are the i-th coupling unit pair with completely identical performance; wherein, ;

[0010] Coupling unit pair In the coupling unit The first output end of the coupling unit is used as the first differential signal output end of the broadband impedance converter. The second output end of is used as the second differential signal output end of the wide-band impedance converter; wherein, ;

[0011] The output ends of the coupling units among the N coupling units that are not used as the first differential signal output end and the second differential signal output end are connected to serve as the common end of the wide-band impedance converter.

[0012] Preferably, the coupling unit pair middle,

[0013] Coupling unit In the embodiment, the first coupling coils in all the coupling coil pairs are connected in series, the first ends of the second coupling coils in all the coupling coil pairs are connected to the second input end of the coupling unit, and the second ends of the second coupling coils in all the coupling coil pairs are connected to the second output end of the coupling unit;

[0014] Coupling unit In the embodiment, the second coupling coils in all coupling coil pairs are connected in series, the first ends of the first coupling coils in all coupling coil pairs are connected to the first input end of the coupling unit, and the second ends of the first coupling coils in all coupling coil pairs are connected to the first output end of the coupling unit.

[0015] Preferably, in the coupling unit pair group k,

[0016] The first end of the first coupling coil in all the coupling coil pairs in each coupling unit is connected to the first input end of the coupling unit, the second end of the first coupling coil in all the coupling coil pairs is connected to the first output end of the coupling unit, the first end of the second coupling coil in all the coupling coil pairs is connected to the second input end of the coupling unit, and the second end of the second coupling coil in all the coupling coil pairs is connected to the second output end of the coupling unit;

[0017] in, and .

[0018] Preferably, each coupling unit is composed of dielectric layers stacked up and down, wherein each coupling coil pair in the coupling unit is composed of four dielectric layers stacked up and down, and each dielectric layer is provided with a metal routing layer and a through hole;

[0019] The first dielectric layer and the third dielectric layer in each coupling coil pair are connected in parallel through a through hole as a first coupling coil in the coupling coil pair, and the second dielectric layer and the fourth dielectric layer are connected in parallel through a through hole as a second coupling coil in the coupling coil pair;

[0020] Arrange the 1st to N / 2nd coupling units horizontally from small to large according to the serial numbers of the coupling units as the first dielectric layer group, and arrange the N / 2+1st to Nth coupling units horizontally from small to large according to the serial numbers of the coupling units as the second dielectric layer group; the first dielectric layer group and the second dielectric layer group are arranged side by side on the same horizontal plane, and the positions of the first dielectric layer group and the second dielectric layer group are axially symmetrical.

[0021] Preferably, the even-mode impedances of the N coupling units are all equal, the odd-mode impedances of the N coupling units are all equal, the electrical lengths of the coupling coil pairs in the N coupling units are all equal, and the widths of the coupling coil pairs in the N coupling units are all equal;

[0022] The even-mode impedances of the coupling coil pairs in the N coupling units are all equal, and the odd-mode impedances of the coupling coil pairs in the N coupling units are all equal.

[0023] Preferably, .

[0024] Preferably, a common terminal of the wide-band impedance transformer is grounded.

[0025] Preferably, the common end of the wide-band impedance converter is connected to the positive electrode of a decoupling capacitor, the negative electrode of the decoupling capacitor is grounded, and the positive electrode of the decoupling capacitor is connected to a power supply.

[0026] Preferably, when N is 2 and each coupling unit includes two coupling coil pairs,

[0027] The first end of the first coupling coil in the first coupling coil pair in the two coupling units is connected as the first differential signal input end of the wide-band impedance converter; the first end of the second coupling coil in the first coupling coil pair in the two coupling units is connected as the second differential signal input end of the wide-band impedance converter;

[0028] In the first coupling unit, the first coupling coils of the two coupling coil pairs are connected in series, the first end of the second coupling coil in the first coupling coil pair is connected to the first end of the second coupling coil in the second coupling coil pair, the second end of the second coupling coil in the first coupling coil pair is connected to the second end of the second coupling coil in the second coupling coil pair, and the second end of the first coupling coil in the second coupling coil pair serves as the first differential signal output end of the wide-band impedance converter;

[0029] In the second coupling unit, the second coupling coils in the two coupling coil pairs are connected in series, the first end of the first coupling coil in the first coupling coil pair is connected to the first end of the first coupling coil in the second coupling coil pair, the second end of the first coupling coil in the first coupling coil pair is connected to the second end of the first coupling coil in the second coupling coil pair, and the second end of the second coupling coil in the second coupling coil pair serves as the second differential signal output end of the wide-band impedance converter;

[0030] The second end of the second coupling coil in the second coupling coil pair in the first coupling unit and the second end of the first coupling coil in the second coupling coil pair in the second coupling unit are connected as a common end of the wide-band impedance converter.

[0031] Preferably, the first coupling unit and the second coupling unit are both composed of eight dielectric layers stacked up and down, and each dielectric layer is provided with a metal wiring layer and a connecting hole;

[0032] The first dielectric layer and the third dielectric layer in each coupling unit are connected in parallel through the connecting hole as the first coupling coil in the first coupling coil pair, the second dielectric layer and the fourth dielectric layer are connected in parallel through the connecting hole as the second coupling coil in the first coupling coil pair, the fifth dielectric layer and the seventh dielectric layer are connected in parallel through the connecting hole as the first coupling coil in the second coupling coil pair, and the sixth dielectric layer and the eighth dielectric layer are connected in parallel through the connecting hole as the second coupling coil in the second coupling coil pair;

[0033] The first coupling unit is used as a first dielectric layer group, and the second coupling unit is used as a second dielectric layer group. The first dielectric layer group and the second dielectric layer group are arranged side by side on the same horizontal plane, and the positions of the first dielectric layer group and the second dielectric layer group are axially symmetrical.

[0034] Preferably, the even-mode impedance of the first coupling unit is equal to the even-mode impedance of the second coupling unit;

[0035] The odd-mode impedance of the first coupling unit is equal to the odd-mode impedance of the second coupling unit;

[0036] The electrical length of the coupling coil pair in the first coupling unit is equal to the electrical length of the coupling coil pair in the second coupling unit;

[0037] The width of the coupling coil pair in the first coupling unit is equal to the width of the coupling coil pair in the second coupling unit;

[0038] The even-mode impedance of the coupling coil pair in the first coupling unit is equal to the even-mode impedance of the coupling coil pair in the second coupling unit;

[0039] The odd-mode impedance of the coupled coil pair in the first coupling unit is equal to the odd-mode impedance of the coupled coil pair in the second coupling unit.

[0040] The present invention also provides an electronic device, comprising the above-mentioned wide-band impedance converter.

[0041] The wide-band impedance converter provided by the present invention is composed of an even number of coupling units, each of which includes at least two coupling coil pairs. By increasing the number of coupling coil pairs in a single coupling unit, the coupling effect of each coupling unit can be increased, thereby improving the coupling efficiency of the entire device, thereby widening the working frequency band of the device and improving the bandwidth performance of the device; at the same time, the multiple coupling coil pairs in each coupling unit help to disperse the influence of parasitic capacitance and inductance, reduce the attenuation of the high frequency band, and thus reduce the interference of the parasitic capacitance in the device on signal transmission; the present application uses multiple coupling coil pairs to design coupling units, and then uses multiple coupling units to design the impedance converter with a high coupling effect, and its working frequency band range reaches 5.5GHz, and there is almost no insertion loss in the entire frequency band range, which can realize efficient and stable transmission of signals. At the same time, by adjusting the impedance characteristic parameters of the coupling unit, the device can realize different impedance transformation ratios in a wider frequency band, so that it can be better applied to high-frequency and high-transmission-efficiency communication systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0043] Figure 1 A schematic diagram of the circuit structure of a wide-band impedance converter provided by the present invention;

[0044] Figure 2 A schematic diagram of the circuit structure of a second wide-band impedance converter provided by the present invention;

[0045] Figure 3A schematic diagram of the circuit structure of a third wide-band impedance converter provided by the present invention;

[0046] Figure 4 A schematic diagram of the circuit structure of a fourth wide-band impedance converter provided by the present invention;

[0047] Figure 5 for Figure 2 The schematic diagram of the curve of return loss and insertion loss of the wideband impedance transformer as a function of frequency is shown;

[0048] Figure 6 for Figure 2 The schematic diagram of the structure of the wide-band impedance converter shown in FIG. Figure 6 (a) is a schematic diagram of the 3D structure of a broadband impedance transformer. Figure 6 (b) is the side view of the broadband impedance transformer. Figure 6 (c) is a top view of the broadband impedance transformer;

[0049] Figure 7 for Figure 6 The connection diagram of the wideband impedance transformer shown;

[0050] Figure 8 for Figure 6 The schematic diagram of the curve of return loss and insertion loss of the wideband impedance transformer as a function of frequency is shown;

[0051] Fig. 9 A schematic diagram of the circuit structure of an impedance converter provided as a comparative example of the present invention;

[0052] Fig.10 for Fig. 9 The schematic diagram of the change of return loss and insertion loss of the impedance transformer with frequency is shown. DETAILED DESCRIPTION

[0053] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0054] The embodiment of the present application provides a broadband impedance converter, which specifically includes:

[0055] coupling units, each coupling unit includes at least two coupling coil pairs, each coupling coil pair includes a first coupling coil and a second coupling coil; in each coupling unit, the first end of the first coupling coil in the first coupling coil pair is the first input end of the coupling unit, the first end of the second coupling coil in the first coupling coil pair is the second input end of the coupling unit, the second end of the first coupling coil in the last coupling coil pair is the first output end of the coupling unit, and the second end of the second coupling coil in the last coupling coil pair is the second output end of the coupling unit; wherein, is an even number;

[0056] The first input ends of the N coupling units are connected to serve as the first differential signal input end of the wide-band impedance converter; the second input ends of the N coupling units are connected to serve as the second differential signal input end of the wide-band impedance converter;

[0057] The i-th coupling unit and the N+1-i-th coupling unit are the i-th coupling unit pair with completely identical performance; wherein, ;

[0058] Coupling unit pair In the coupling unit The first output end of the coupling unit is used as the first differential signal output end of the broadband impedance converter. The second output end of is used as the second differential signal output end of the wide-band impedance converter; wherein, ;

[0059] The output ends of the coupling units among the N coupling units that are not used as the first differential signal output end and the second differential signal output end are connected to serve as the common end of the wide-band impedance converter.

[0060] The wide-band impedance converter provided by the present invention is composed of an even number of coupling units, each of which includes at least two coupling coil pairs. By increasing the number of coupling coil pairs in a single coupling unit, the coupling effect of each coupling unit can be increased, thereby improving the coupling efficiency of the entire device, thereby widening the working frequency band of the device and improving the bandwidth performance of the device; at the same time, the multiple coupling coil pairs in each coupling unit help to disperse the influence of parasitic capacitance and inductance, reduce the attenuation of the high frequency band, and thus reduce the interference of the parasitic capacitance in the device on signal transmission; the present application uses multiple coupling coil pairs to design coupling units, and then uses multiple coupling units to design the impedance converter with a high coupling effect, and its working frequency band range reaches 5.5GHz, and there is almost no insertion loss in the entire frequency band range, which can realize efficient and stable transmission of signals. At the same time, by adjusting the impedance characteristic parameters of the coupling unit, the device can realize different impedance transformation ratios in a wider frequency band, so that it can be better applied to high-frequency and high-transmission-efficiency communication systems.

[0061] Specifically, in some embodiments of the present application, the coupling unit pair is middle,

[0062] Coupling unit In the embodiment, the first coupling coils in all the coupling coil pairs are connected in series, the first ends of the second coupling coils in all the coupling coil pairs are connected to the second input end of the coupling unit, and the second ends of the second coupling coils in all the coupling coil pairs are connected to the second output end of the coupling unit;

[0063] Coupling unit In the embodiment, the second coupling coils in all coupling coil pairs are connected in series, the first ends of the first coupling coils in all coupling coil pairs are connected to the first input end of the coupling unit, and the second ends of the first coupling coils in all coupling coil pairs are connected to the first output end of the coupling unit.

[0064] In some embodiments of the present application, in the coupling unit pair group k,

[0065] The first end of the first coupling coil in all the coupling coil pairs in each coupling unit is connected to the first input end of the coupling unit, the second end of the first coupling coil in all the coupling coil pairs is connected to the first output end of the coupling unit, the first end of the second coupling coil in all the coupling coil pairs is connected to the second input end of the coupling unit, and the second end of the second coupling coil in all the coupling coil pairs is connected to the second output end of the coupling unit;

[0066] in, and .

[0067] By connecting multiple coupling coil pairs in each coupling unit according to the connection method provided in the embodiment of the present application, the coupling effect between the coupling coils can be enhanced, thereby more accurately matching the input and output impedances, reducing reflection losses and frequency response deviations caused by parasitic parameters, allowing signals to be effectively transmitted over a wider frequency range, expanding the operating frequency band of the device, and further improving the bandwidth performance of the device.

[0068] Based on the wide-band impedance transformer provided in the above-mentioned embodiment, a 3D stacking packaging method is adopted in the embodiment of the present application to integrate the above-mentioned wide-band impedance transformer into a multi-layer substrate, and the multi-layer substrate is connected together by tin welding, thereby improving the space area utilization rate inside the product, reducing the electromagnetic interference and parasitic effects of the complex RF components of the product, improving the flexibility of circuit design, and reducing manufacturing costs.

[0069] Specifically, the implementation method is:

[0070] Each coupling unit is composed of dielectric layers stacked up and down, wherein each coupling coil pair in the coupling unit is composed of four dielectric layers stacked up and down, and each dielectric layer is provided with a metal routing layer and a through hole;

[0071] The first dielectric layer and the third dielectric layer in each coupling coil pair are connected in parallel through a through hole as a first coupling coil in the coupling coil pair, and the second dielectric layer and the fourth dielectric layer are connected in parallel through a through hole as a second coupling coil in the coupling coil pair;

[0072] Arrange the 1st to N / 2nd coupling units horizontally from small to large according to the serial numbers of the coupling units as the first dielectric layer group, and arrange the N / 2+1st to Nth coupling units horizontally from small to large according to the serial numbers of the coupling units as the second dielectric layer group; the first dielectric layer group and the second dielectric layer group are arranged side by side on the same horizontal plane, and the positions of the first dielectric layer group and the second dielectric layer group are axially symmetrical.

[0073] In the embodiment of the present application, each coupling coil pair is composed of only four dielectric layers, the preparation process is simple, and the cost is lower. At the same time, the electromagnetic interference and coupling effect introduced by the metal lines in the multi-layer dielectric layers are reduced, and the performance of the device is effectively improved. At the same time, all coupling units are divided into two dielectric layer groups, and the two dielectric layer groups are symmetrically arranged to ensure the balance of the device.

[0074] In some embodiments of the present application, the first output end of one coupling unit and the second output end of another coupling unit in any pair of coupling units with completely identical performance can be used as the first differential signal output end and the second differential signal output end of the wide-band impedance converter; preferably, , that is, the first output end of the first coupling unit and the second output end of the Nth coupling unit are used as the first differential signal output end and the second differential signal output end of the wide-band impedance converter, thereby further improving the bandwidth performance of the device.

[0075] Furthermore, different impedance transformation ratios from input signal to output signal can be achieved by changing the characteristic impedance of the coupling unit and the coupling coil pair:

[0076] In some embodiments of the present application, the even-mode impedances of the N coupling units are all equal, the odd-mode impedances of the N coupling units are all equal, the electrical lengths of the coupling coil pairs in the N coupling units are all equal, and the widths of the coupling coil pairs in the N coupling units are all equal;

[0077] The even-mode impedances of the coupling coil pairs in the N coupling units are all equal, and the odd-mode impedances of the coupling coil pairs in the N coupling units are all equal.

[0078] Based on the limitations of the even-mode impedance, odd-mode impedance, electrical length and width of the coupling unit and the coupling coil pair, the broadband impedance transformer can achieve an impedance transformation ratio of 1:9 from the input end to the output end.

[0079] Optionally, the common end of the wideband impedance converter may be grounded, or connected to the positive electrode of a decoupling capacitor, the negative electrode of the decoupling capacitor is grounded, and the positive electrode of the decoupling capacitor is connected to a power supply.

[0080] Grounding the common end of the wide-band impedance converter can reduce electromagnetic interference between different ports and enhance the isolation effect of differential signals and common-mode signals; connecting the common end of the wide-band impedance converter to the power supply and grounding it through a decoupling capacitor can not only complete the impedance conversion, but also act as a choke inductor to filter out the AC ripple of the power supply and provide a stable DC voltage.

[0081] An embodiment of the present application further provides an electronic device, which includes the above-mentioned wide-band impedance converter.

[0082] Optionally, the number N of coupling units can be 2, 4, 6 or other even numbers. The wide-band impedance transformer with a completely symmetrical structure designed with an even number of coupling units has good balance and can provide a good phase relationship, ensuring that the device provides symmetrical impedance matching within the operating frequency range and avoiding impedance mismatch problems caused by phase differences. At the same time, an even number of coupling units can reduce frequency response fluctuations and instability caused by asymmetry in high-frequency applications, thereby improving the bandwidth performance of the device.

[0083] Each coupling unit includes at least two coupling coil pairs. By increasing the number of coupling coil pairs, the frequency response characteristics of the device can be optimized and impedance matching in a wider range can be achieved, so that the device maintains good impedance matching characteristics in a wider frequency range.

[0084] The above broadband impedance converter is further explained below through multiple embodiments and comparative examples: Example 1

[0085] See also Figure 1 , Figure 1 A wideband impedance transformer composed of four coupling units is provided in an embodiment of the present application, each coupling unit includes three coupling coil pairs, which specifically include:

[0086] A first coupling unit 1 , a second coupling unit 2 , a third coupling unit 3 and a fourth coupling unit 4 .

[0087] The first coupling unit 1 includes a first coupling coil pair 11, a second coupling coil pair 12 and a third coupling coil pair 13; the second coupling unit 2 includes a first coupling coil pair 21, a second coupling coil pair 22 and a third coupling coil pair 23; the third coupling unit 3 includes a first coupling coil pair 31, a second coupling coil pair 32 and a third coupling coil pair 33; the fourth coupling unit 4 includes a first coupling coil pair 41, a second coupling coil pair 42 and a third coupling coil pair 43;

[0088] A first end of the first coupling coil 111 in the first coupling coil pair 11 in the first coupling unit 1, a first end of the first coupling coil 211 in the first coupling coil pair 21 in the second coupling unit 2, a first end of the first coupling coil 311 in the first coupling coil pair 31 in the third coupling unit 3, and a first end of the first coupling coil 411 in the first coupling coil pair 41 in the fourth coupling unit 4 are connected as a first differential signal input terminal P1 of the wide-band impedance converter;

[0089] The first end of the second coupling coil 112 in the first coupling coil pair 11 in the first coupling unit 1, the first end of the second coupling coil 212 in the first coupling coil pair 21 in the second coupling unit 2, the first end of the second coupling coil 312 in the first coupling coil pair 31 in the third coupling unit 3, and the first end of the second coupling coil 412 in the first coupling coil pair 41 in the fourth coupling unit 4 are connected as the second differential signal input terminal P2 of the wide-band impedance converter;

[0090] In the first coupling unit 1, the first coupling coils of the three coupling coil pairs are connected in series, the first end of the second coupling coil 112 in the first coupling coil pair 11, the first end of the second coupling coil 122 in the second coupling coil pair 12, and the first end of the second coupling coil 132 in the third coupling coil pair 13 are connected, the second end of the second coupling coil 112 in the first coupling coil pair 11, the second end of the second coupling coil 122 in the second coupling coil pair 12, and the second end of the second coupling coil 132 in the third coupling coil pair 13 are connected, and the second end of the first coupling coil 131 in the third coupling coil pair 13 serves as the first differential signal output end P3 of the wide-band impedance converter;

[0091] In the second coupling unit 2, the first end of the first coupling coil 221 in the second coupling coil pair 22 and the first end of the first coupling coil 231 in the third coupling coil pair 23 are connected to the first end of the first coupling coil 211 in the first coupling coil pair 21; the first end of the second coupling coil 222 in the second coupling coil pair 22 and the first end of the second coupling coil 232 in the third coupling coil pair 23 are connected to the first end of the second coupling coil 212 in the first coupling coil pair 21; the second end of the first coupling coil 211 in the first coupling coil pair 21 and the second end of the first coupling coil 221 in the second coupling coil pair 22 are connected to the second end of the first coupling coil 231 in the third coupling coil pair 23; the second end of the second coupling coil 212 in the first coupling coil pair 21 and the second end of the second coupling coil 222 in the second coupling coil pair 22 are connected to the second end of the second coupling coil 232 in the third coupling coil pair 23;

[0092] In the third coupling unit 3, the first end of the first coupling coil 321 in the second coupling coil pair 32 and the first end of the first coupling coil 331 in the third coupling coil pair 33 are connected to the first end of the first coupling coil 311 in the first coupling coil pair 31; the first end of the second coupling coil 322 in the second coupling coil pair 32 and the first end of the second coupling coil 332 in the third coupling coil pair 33 are connected to the first end of the second coupling coil 312 in the first coupling coil pair 31; the second end of the first coupling coil 311 in the first coupling coil pair 31 and the second end of the first coupling coil 321 in the second coupling coil pair 32 are connected to the second end of the first coupling coil 331 in the third coupling coil pair 33; the second end of the second coupling coil 312 in the first coupling coil pair 31 and the second end of the second coupling coil 322 in the second coupling coil pair 32 are connected to the second end of the second coupling coil 332 in the third coupling coil pair 33;

[0093] In the fourth coupling unit 4, the second coupling coils in the three coupling coil pairs are connected in series, the first end of the first coupling coil 411 in the first coupling coil pair 41, the first end of the first coupling coil 421 in the second coupling coil pair 42, and the first end of the first coupling coil 431 in the third coupling coil pair 43 are connected, the second end of the first coupling coil 411 in the first coupling coil pair 41, the second end of the first coupling coil 421 in the second coupling coil pair 42, and the second end of the first coupling coil 431 in the third coupling coil pair 43 are connected, and the second end of the second coupling coil 432 in the third coupling coil pair 43 serves as the second differential signal output end P4 of the wide-band impedance converter;

[0094] The second end of coupling coil 132, the second end of coupling coil 231, the second end of coupling coil 232, the second end of coupling coil 331, the second end of coupling coil 332 and the second end of coupling coil 431 are connected as a common end of the wideband impedance transformer. Example 2

[0095] Although increasing the number of coupled coil pairs will improve the bandwidth performance of the device, each coupled coil pair will introduce certain parasitic parameters. Therefore, the more coupled coil pairs there are, the larger the parasitic parameters in the circuit will be, thereby causing parasitic resonance or poor frequency response, affecting the bandwidth of the device.

[0096] Therefore, preferably, the number N of coupling units is 2, and the number of coupling coil pairs in each coupling unit is 2, which can ensure that the device has good bandwidth performance and balance performance while taking into account the volume and cost of the device.

[0097] See also Figure 2 , Figure 2 A wideband impedance converter composed of two coupling units is provided in an embodiment of the present application, each coupling unit includes two coupling coil pairs, which specifically include:

[0098] a first coupling unit 1 and a second coupling unit 2;

[0099] The first coupling unit 1 includes a first coupling coil pair 11 and a second coupling coil pair 12 ; the second coupling unit 2 includes a first coupling coil pair 21 and a second coupling coil pair 22 .

[0100] The first end of the first coupling coil 111 in the first coupling coil pair 11 in the first coupling unit 1 and the first end of the first coupling coil 211 in the first coupling coil pair 21 in the second coupling unit 2 are connected as the first differential signal input end P1 of the wide-band impedance converter; the first end of the second coupling coil 112 in the second coupling coil pair 11 in the first coupling unit 1 and the first end of the second coupling coil 212 in the first coupling coil pair 21 in the second coupling unit 2 are connected as the second differential signal input end P2 of the wide-band impedance converter;

[0101] In the first coupling unit 1, the first end of the first coupling coil 121 in the second coupling coil pair 12 is connected to the second end of the first coupling coil 111 in the first coupling coil pair 11, the second end of the first coupling coil 121 in the second coupling coil pair 12 serves as the first differential signal output end P3 of the wide-band impedance converter, the first end of the second coupling coil 112 in the first coupling coil pair 11 is connected to the first end of the second coupling coil 122 in the second coupling coil pair 12, and the second end of the second coupling coil 112 in the first coupling coil pair 11 is connected to the second end of the second coupling coil 122 in the second coupling coil pair 12;

[0102] In the second coupling unit 2, the first end of the second coupling coil 222 in the second coupling coil pair 22 is connected to the second end of the second coupling coil 212 in the first coupling coil pair 21, the second end of the second coupling coil 222 in the second coupling coil pair 22 serves as the second differential signal output end P4 of the wide-band impedance converter, the first end of the first coupling coil 211 in the first coupling coil pair 21 is connected to the first end of the first coupling coil 221 in the second coupling coil pair 22, and the second end of the first coupling coil 211 in the first coupling coil pair 21 is connected to the second end of the first coupling coil 221 in the second coupling coil pair 22;

[0103] The second end of the coupling coil 122 and the second end of the coupling coil 221 are connected to serve as a common end Common of the wide-band impedance converter.

[0104] In some embodiments of the present application, the even-mode impedance Ze of the first coupling unit 1 is equal to the even-mode impedance Ze of the second coupling unit 2; the odd-mode impedance Zo of the first coupling unit 1 is equal to the odd-mode impedance Zo of the second coupling unit 2; the electrical length of the first coupling coil pair 11 in the first coupling unit 1, the electrical length of the second coupling coil pair 12, the electrical length of the first coupling coil pair 21 in the second coupling unit 2, and the electrical length of the second coupling coil pair 22 are all equal; the width of the first coupling coil pair 11 in the first coupling unit 1, the width of the second coupling coil pair 12, the width of the first coupling coil pair 21 in the second coupling unit 2, and the width of the second coupling coil pair 22 are all equal;

[0105] The even-mode impedance Ze of the first coupling coil pair 11 in the first coupling unit 1, the even-mode impedance Ze of the second coupling coil pair 12, the even-mode impedance Ze of the first coupling coil pair 21 in the second coupling unit 2, and the even-mode impedance Ze of the second coupling coil pair 22 are all equal; the odd-mode impedance Zo of the first coupling coil pair 11 in the first coupling unit 1, the odd-mode impedance Zo of the second coupling coil pair 12, the odd-mode impedance Zo of the first coupling coil pair 21 in the second coupling unit 2, and the odd-mode impedance Zo of the second coupling coil pair 22 are all equal.

[0106] Based on the above-mentioned limitations on the odd-mode impedance, even-mode impedance, electrical length and width of the coupled coil pair, the wide-band impedance transformer provided in this embodiment can achieve an impedance transformation ratio of 1:9.

[0107] For example, in some application scenarios, the common terminal of the wideband impedance transformer may be grounded, such as Figure 3 As shown, connecting the common end to the symmetrical center of the structure and grounding it is beneficial to improve the balance of the structure and enhance the isolation effect of differential signals and common-mode signals.

[0108] In other application scenarios, the common end can also be used as a power supply end for feeding, such as Figure 4 As shown, the common end of the wideband impedance converter is connected to the positive electrode of the decoupling capacitor C1, the negative electrode of the decoupling capacitor C1 is grounded, and the positive electrode of the decoupling capacitor C1 is connected to the power supply VDD.

[0109] Based on different application scenarios, the common end of the wide-band impedance converter is connected to different loads, which not only meets the application requirements in different scenarios, but also simplifies the circuit design and layout.

[0110] See also Figure 5 , Figure 5 Provided in the embodiments of this application Figure 2 The schematic diagram of the curve of return loss and insertion loss of the wide-band impedance transformer versus frequency is shown. It can be seen from the figure that within the frequency range of 3.500GHz~5.800GHz, the return loss S((1,1)) of the wide-band impedance transformer is less than -20dB, which indicates that the wide-band impedance transformer provided in this embodiment has a very low signal reflection degree within the entire frequency band, which can not only effectively match the impedance of the input source, but also maximize the absorption of the signal to achieve efficient energy transmission. The insertion loss S((2,1)) is close to 0dB, which indicates that the wide-band impedance transformer provided in this embodiment has almost no loss in the entire signal transmission process, maintaining the strength and quality of the signal.

[0111] Table 1 shows the impedance transformation ratio of the wideband impedance converter provided by the above embodiment as a function of frequency, wherein freq is the operating frequency, Zin1 is the impedance of the differential signal input terminal, and Zin2 is the impedance of the differential signal output terminal;

[0112] Table 1

[0113] freq Zin1 Zin2 3.000GHz 5.828+j1.383 52.489+j12.613 3.100GHz 5.819+j1.304 52.983+j11.844 3.200GHz 5.805+j1.231 53.444+j11.079 3.300GHz 5.787+j1.163 53.876+j10.315 3.400GHz 5.764+j1.100 54.279+j9.553 3.500GHz 5.738+j1.042 54.654+j8.792 3.600GHz 5.709+j0.989 55.003+j8.030 3.700GHz 5.677+j0.941 55.326+j7.268 3.800GHz 5.643+j0.897 55.623+j6.503 3.900GHz 5.606+j0.857 55.895+j5.737 4.000GHz 5.568+j0.822 56.141+j4.969 4.100GHz 5.528+j0.791 56.362+j4.198 4.200GHz 5.487+j0.764 56.558+j3.425 4.300GHz 5.445+j0.741 56.729+j2.648 4.400GHz 5.402+j0.721 56.873+j1.869 4.500GHz 5.359+j0.706 56.991+j1.088 4.600GHz 5.315+j0.693 57.082+j0.304 4.700GHz 5.270+j0.684 57.147-j0.481 4.800GHz 5.225+j0.678 57.184-j1.267 4.900GHz 5.180+j0.675 57.192-j2.054 5.000GHz 5.135+j0.675 57.173-j2.841 5.100GHz 5.091+j0.677 57.125-j3.626 5.200GHz 5.046+j0.683 57.047-j4.410 5.300GHz 5.002+j0.691 56.941-j5.190 5.400GHz 4.958+j0.702 56.805-j5.966 5.500GHz 4.914+j0.715 56.639-j6.737 5.600GHz 4.871+j0.730 56.443-j7.502 5.700GHz 4.828+j0.747 56.218-j8.258 5.800GHz 4.786+j0.767 55.963-j9.005 5.900GHz 4.745+j0.789 55.678-j9.742

[0114] It can be seen from the data in Table 1 that the wideband impedance transformer provided by the present application can achieve an impedance transformation ratio of 1:9 from the input end to the output end within the frequency range of 3.500 GHz to 5.800 GHz.

[0115] It can be seen from the above data that the wide-band impedance transformer provided in this embodiment has a frequency band range of 3.500GHz~5.800GHz, has excellent bandwidth characteristics and extremely small insertion loss, can better process signals with a wide bandwidth range, and is suitable for applications requiring high-quality transmission, such as wireless communication systems and high-speed data transmission. Example 3

[0116] Based on the broadband impedance transformer provided in the above-mentioned embodiment 2, the present embodiment adopts a 3D stacking packaging method to integrate it into a multi-layer substrate, and uses a tin soldering method to connect the multi-layer substrates together, such as Figure 6 FIG. 1 is a schematic diagram of the structure of the prepared differential impedance transformer, wherein: Figure 6 (a) shows the 3D structure schematic diagram of the prepared wide-band impedance transformer. Figure 6 (b) and Figure 6 (c) in the figure shows the side view and top view of the wide-band impedance transformer respectively.

[0117] Specifically, see Figure 7 , Figure 7 for Figure 6 The specific connection diagram of the broadband impedance converter is shown in FIG.

[0118] The first coupling unit 1 is composed of eight dielectric layers LM1, LM2, LM3, LM4, LM5, LM6, LM7, and LM8 stacked up and down, wherein the first coupling coil pair 11 is composed of the dielectric layers LM1, LM2, LM3, and LM4, LM1 and LM3 are connected in parallel through a connecting hole as a first coupling coil 111 in the first coupling coil pair 11, and LM2 and LM4 are connected in parallel through a connecting hole as a second coupling coil 112 in the first coupling coil pair 11; the second coupling coil pair 12 is composed of the dielectric layers LM5, LM6, LM7, and LM8, LM5 and LM7 are connected in parallel through a connecting hole as a first coupling coil 121 in the second coupling coil pair 12, and LM6 and LM8 are connected in parallel through a connecting hole as a second coupling coil 122 in the second coupling coil pair 12;

[0119] The second coupling unit 2 is composed of eight dielectric layers RM1, RM2, RM3, RM4, RM5, RM6, RM7, and RM8 stacked up and down, wherein the first coupling coil pair 21 is composed of dielectric layers RM1, RM2, RM3, and RM4, RM1 and RM3 are connected in parallel through connecting holes as the first coupling coil 211 in the first coupling coil pair 21, and RM2 and RM4 are connected in parallel through connecting holes as the second coupling coil 212 in the first coupling coil pair 21; the second coupling coil pair 22 is composed of dielectric layers RM5, RM6, RM7, and RM8, RM5 and RM7 are connected in parallel through connecting holes as the first coupling coil 221 in the second coupling coil pair 22, and RM6 and RM8 are connected in parallel through connecting holes as the second coupling coil 222 in the second coupling coil pair 22.

[0120] Specifically, the wideband impedance transformer provided in the embodiment of the present application is formed by stacking multiple dielectric layers and also adopts an axisymmetric structure, which not only takes into account small size and low cost, but also improves the balance of the device.

[0121] See also Figure 8 , Figure 8 Provided for the embodiments of this application Figure 6 The diagram shows a curve of the return loss and insertion loss of the wideband impedance transformer changing with frequency. It can be seen from the figure that within the frequency range of 3.500GHz~5.800GHz, the return loss of the wideband impedance transformer is less than -20dB and the insertion loss is close to 0.

[0122] Table 2 shows the impedance transformation ratio of the wideband impedance converter provided by the above embodiment as a function of frequency, wherein freq is the operating frequency, Zin1 is the impedance of the differential signal input terminal, and Zin2 is the impedance of the differential signal output terminal;

[0123] Table 2

[0124] freq Zin1 Zin2 3.000GHz 7.941+j0.603 39.798+j6.028 3.100GHz 7.782+j0.537 51.059+j6.386 3.200GHz 7.633+j0.487 42.302+j6.644 3.300GHz 7.494+j0.451 43.525+j6.804 3.400GHz 7.363+j0.427 44.726+j6.867 3.500GHz 7.240+j0.411 45.901+j6.837 3.600GHz 7.125+j0.404 47.047+j6.715 3.700GHz 7.016+j0.404 48.159+j6.502 3.800GHz 6.913+j0.410 49.235+j6.202 3.900GHz 6.816+j0.421 50.267+j5.815 4.000GHz 6.724+j0.437 51.250+j5.343 4.100GHz 6.636+j0.456 52.179+j4.792 4.200GHz 6.533+j0.479 53.050+j4.163 4.300GHz 6.474+j0.505 53.855+j3.463 4.400GHz 6.398+j0.534 54.590+j2.695 4.500GHz 6.326+j0.565 55.246+j1.864 4.600GHz 6.257+j0.598 55.825+j0.979 4.700GHz 6.191+j0.633 56.319+0.046 4.800GHz 6.128+j0.671 56.725-j0.928 4.900GHz 6.067+j0.709 57.039-j1.934 5.000GHz 6.009+j0.750 57.260-j2.965 5.100GHz 5.953+j0.791 57.386-j4.011 5.200GHz 5.899+j0.834 57.417-j5.063 5.300GHz 5.847+j0.878 57.354-j6.114 5.400GHz 5.797+j0.924 57.198-j7.154 5.500GHz 5.749+j0.970 56.952-j8.176 5.600GHz 5.702+j1.017 56.619-j9.170 5.700GHz 5.657+j1.065 56.204-j10.130 5.800GHz 5.614+j1.114 55.712-j11.050 5.900GHz 5.573+j1.164 55.148-j11.923 6.000GHz 5.533+j1.214 54.518-j12.744

[0125] It can be seen from the data in Table 2 that the relative bandwidth of the wide-band impedance transformer integrated by the substrate provided in this embodiment reaches 49%, indicating that the wide-band impedance transformer can provide the required impedance transformation ratio within a wider frequency range and has better practicality and practical value. Comparative Example

[0126] See also Fig. 9 , Fig. 9 A schematic diagram of an existing impedance converter circuit structure provided as a comparative example of the present application;

[0127] The impedance transformer includes four coupling coil pairs, each coupling coil pair includes a first coupling coil and a second coupling coil;

[0128] The first end of the first coupling coil among the four coupling coil pairs is connected as the first differential signal input end P1 of the impedance converter, and the first end of the second coupling coil among the four coupling coil pairs is connected as the second differential signal input end P2 of the impedance converter;

[0129] The second end of the first coupling coil 111 in the first coupling coil pair 11 serves as the first differential signal output end P3 of the impedance converter, and the second end of the second coupling coil 142 in the fourth coupling coil pair 14 serves as the second differential signal output end P4 of the impedance converter;

[0130] The second end of the second coupling coil 112 in the first coupling coil pair 11, the second end of the first coupling coil 121 and the second end of the second coupling coil 122 in the second coupling coil pair 12, the second end of the first coupling coil 131 and the second end of the second coupling coil 132 in the third coupling coil pair 13, and the second end of the first coupling coil 141 in the fourth coupling coil pair 14 are connected as a common end of the impedance transformer.

[0131] See also Fig.10 , Fig.10 For the comparative example of this application Fig. 9 The schematic diagram of the curve of the return loss and insertion loss of the impedance converter as a function of frequency is shown. It can be seen from the figure that in the frequency range of 4.600GHz~5.200GHz, the return loss S((1,1)) of the impedance converter is less than -20dB, and the insertion loss S((2,1)) is greater than -0.1dB.

[0132] In the impedance converter, the even-mode impedance Ze of the first coupling coil pair 11 is equal to the even-mode impedance Ze of the fourth coupling coil pair 14; the even-mode impedance Ze of the second coupling coil pair 12 is equal to the even-mode impedance Ze of the third coupling coil pair 13;

[0133] The odd-mode impedance Zo of the first coupling coil pair 11 is equal to the odd-mode impedance Zo of the fourth coupling coil pair 14; the odd-mode impedance Zo of the second coupling coil pair 12 is equal to the odd-mode impedance Zo of the third coupling coil pair 13; and the odd-mode impedance Zo of the second coupling coil pair 12 is twice the odd-mode impedance Zo of the first coupling coil pair 11;

[0134] The electrical length and width of the coupling coil in the first coupling coil pair 11 are equal to the electrical length and width of the coupling coil in the fourth coupling coil pair 14; the electrical length and width of the coupling coil in the second coupling coil pair 12 are equal to the electrical length and width of the coupling coil in the third coupling coil pair 13; and the width of the coupling coil in the first coupling coil pair 11 is twice the width of the coupling coil in the second coupling coil pair 12.

[0135] Table 3 shows the impedance conversion ratio of the impedance converter provided in the above comparative example as a function of frequency, wherein freq is the operating frequency, Zin1 is the impedance of the differential signal input terminal, and Zin2 is the impedance of the differential signal output terminal;

[0136] Table 3

[0137] freq Zin1 Zin2 4.000GHz 8.337+j2.520 39.307+j22.423 4.100GHz 8.176+j1.921 41.545+j20.733 4.200GHz 7.922+j1.400 43.624+j18.740 4.300GHz 7.603+j0.967 45.487+j16.462 4.400GHz 7.244+j0.624 47.080+j13.933 4.500GHz 6.867+j0.365 48.355+j11.201 4.600GHz 6.489+j0.182 49.277+j8.321 4.700GHz 6.120+j0.064 49.826+j5.361 4.800GHz 5.769+j0.002 49.995+j2.388 4.900GHz 5.439-j0.015 49.797-j0.533 5.000GHz 5.134+j0.004 49.257-j3.340 5.100GHz 4.852+j0.054 48.410-j5.984 5.200GHz 4.594+j0.127 47.301-j8.425 5.300GHz 4.359+j0.218 45.978-j10.638 5.400GHz 4.145+j0.325 44.491-j12.608 5.500GHz 3.951+j0.444 42.884-j14.331 5.600GHz 3.776+j0.571 41.202-j15.816 5.700GHz 3.616+j0.706 39.479-j17.058 5.800GHz 3.472+j0.847 37.748-j18.089 5.900GHz 3.342+j0.993 36.033-j18.922

[0138] By comparing the bandwidth ranges of the impedance transformers provided in Example 2, Example 3 and the comparative example, it can be seen that the broadband impedance transformers provided in Example 2 and Example 3 can achieve an impedance transformation ratio of 1:9 from the input end to the output end in the range of 3.500 GHz to 5.800 GHz, while the impedance transformer in the comparative example can only achieve an impedance transformation ratio of 1:9 from the input end to the output end in the range of 4.600 GHz to 5.200 GHz, which indicates that the broadband impedance transformer provided by the present application has excellent bandwidth performance compared with the impedance transformer in the comparative example; and the insertion loss and return loss of the broadband impedance transformer in Example 2 and Example 3 are both less than the impedance transformer in the comparative example; in addition, by comparing the data in Table 1, Table 2 and Table 3, it can also be seen that within the same operating frequency range, the broadband impedance transformers in Example 2 and Example 3 have a better impedance transformation ratio than the impedance transformer in the comparative example, indicating that the broadband impedance transformer designed in the present application not only has better bandwidth performance and impedance transformation ratio, but also has lower insertion loss and return loss.

[0139] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A broadband impedance converter, characterized in that: include: coupling units, each coupling unit includes at least two coupling coil pairs, each coupling coil pair includes a first coupling coil and a second coupling coil; in each coupling unit, the first end of the first coupling coil in the first coupling coil pair is the first input end of the coupling unit, the first end of the second coupling coil in the first coupling coil pair is the second input end of the coupling unit, the second end of the first coupling coil in the last coupling coil pair is the first output end of the coupling unit, and the second end of the second coupling coil in the last coupling coil pair is the second output end of the coupling unit; wherein, is an even number; The first input ends of the N coupling units are connected to serve as the first differential signal input end of the wide-band impedance converter; the second input ends of the N coupling units are connected to serve as the second differential signal input end of the wide-band impedance converter; The i-th coupling unit and the N+1-i-th coupling unit are the i-th coupling unit pair with completely identical performance; wherein, ; Coupling unit pair In the coupling unit The first output end of the coupling unit is used as the first differential signal output end of the broadband impedance converter. The second output end of is used as the second differential signal output end of the wide-band impedance converter; wherein, ; Coupling unit In the coupling unit, the first coupling coils in all the coupling coil pairs are connected in series, the first ends of the second coupling coils in all the coupling coil pairs are connected to the second input end of the coupling unit, and the second ends of the second coupling coils in all the coupling coil pairs are connected to the second output end of the coupling unit; the coupling unit In the embodiment, the second coupling coils in all the coupling coil pairs are connected in series, the first ends of the first coupling coils in all the coupling coil pairs are connected to the first input end of the coupling unit, and the second ends of the first coupling coils in all the coupling coil pairs are connected to the first output end of the coupling unit; In the coupling unit pair group k, the first end of the first coupling coil in all the coupling coil pairs in each coupling unit is connected to the first input end of the coupling unit, the second end of the first coupling coil in all the coupling coil pairs is connected to the first output end of the coupling unit, the first end of the second coupling coil in all the coupling coil pairs is connected to the second input end of the coupling unit, and the second end of the second coupling coil in all the coupling coil pairs is connected to the second output end of the coupling unit; wherein, and ; The output ends of the coupling units among the N coupling units that are not used as the first differential signal output end and the second differential signal output end are connected to serve as the common end of the wide-band impedance converter.

2. The broadband impedance converter according to claim 1, characterized in that: Each coupling unit is composed of dielectric layers stacked up and down, wherein each coupling coil pair in the coupling unit is composed of four dielectric layers stacked up and down, and each dielectric layer is provided with a metal routing layer and a through hole; The first dielectric layer and the third dielectric layer in each coupling coil pair are connected in parallel through a through hole as a first coupling coil in the coupling coil pair, and the second dielectric layer and the fourth dielectric layer are connected in parallel through a through hole as a second coupling coil in the coupling coil pair; Arrange the 1st to N / 2nd coupling units horizontally from small to large according to the serial numbers of the coupling units as the first dielectric layer group, and arrange the N / 2+1st to Nth coupling units horizontally from small to large according to the serial numbers of the coupling units as the second dielectric layer group; the first dielectric layer group and the second dielectric layer group are arranged side by side on the same horizontal plane, and the positions of the first dielectric layer group and the second dielectric layer group are axially symmetrical.

3. The broadband impedance converter according to claim 1, characterized in that: The even-mode impedances of the N coupling units are all equal, the odd-mode impedances of the N coupling units are all equal, the electrical lengths of the coupling coil pairs in the N coupling units are all equal, and the widths of the coupling coil pairs in the N coupling units are all equal; The even-mode impedances of the coupling coil pairs in the N coupling units are all equal, and the odd-mode impedances of the coupling coil pairs in the N coupling units are all equal.

4. The broadband impedance converter according to claim 1, characterized in that: 。 5. The broadband impedance converter according to claim 1, characterized in that: The common end of the broadband impedance converter is grounded.

6. The broadband impedance converter according to claim 1, characterized in that: The common end of the broadband impedance converter is connected to the positive electrode of the decoupling capacitor, the negative electrode of the decoupling capacitor is grounded, and the positive electrode of the decoupling capacitor is connected to a power supply.

7. The broadband impedance converter according to claim 1, characterized in that: When N is 2 and each coupling unit includes two coupling coil pairs, The first end of the first coupling coil in the first coupling coil pair in the two coupling units is connected as the first differential signal input end of the wide-band impedance converter; the first end of the second coupling coil in the first coupling coil pair in the two coupling units is connected as the second differential signal input end of the wide-band impedance converter; In the first coupling unit, the first coupling coils of the two coupling coil pairs are connected in series, the first end of the second coupling coil in the first coupling coil pair is connected to the first end of the second coupling coil in the second coupling coil pair, the second end of the second coupling coil in the first coupling coil pair is connected to the second end of the second coupling coil in the second coupling coil pair, and the second end of the first coupling coil in the second coupling coil pair serves as the first differential signal output end of the wide-band impedance converter; In the second coupling unit, the second coupling coils in the two coupling coil pairs are connected in series, the first end of the first coupling coil in the first coupling coil pair is connected to the first end of the first coupling coil in the second coupling coil pair, the second end of the first coupling coil in the first coupling coil pair is connected to the second end of the first coupling coil in the second coupling coil pair, and the second end of the second coupling coil in the second coupling coil pair serves as the second differential signal output end of the wide-band impedance converter; The second end of the second coupling coil in the second coupling coil pair in the first coupling unit and the second end of the first coupling coil in the second coupling coil pair in the second coupling unit are connected as a common end of the wide-band impedance converter.

8. The broadband impedance converter according to claim 7, characterized in that: The first coupling unit and the second coupling unit are both composed of eight dielectric layers stacked up and down, and each dielectric layer is provided with a metal wiring layer and a connecting hole; The first dielectric layer and the third dielectric layer in each coupling unit are connected in parallel through the connecting hole as the first coupling coil in the first coupling coil pair, the second dielectric layer and the fourth dielectric layer are connected in parallel through the connecting hole as the second coupling coil in the first coupling coil pair, the fifth dielectric layer and the seventh dielectric layer are connected in parallel through the connecting hole as the first coupling coil in the second coupling coil pair, and the sixth dielectric layer and the eighth dielectric layer are connected in parallel through the connecting hole as the second coupling coil in the second coupling coil pair; The first coupling unit is used as a first dielectric layer group, and the second coupling unit is used as a second dielectric layer group. The first dielectric layer group and the second dielectric layer group are arranged side by side on the same horizontal plane, and the positions of the first dielectric layer group and the second dielectric layer group are axially symmetrical.

9. The broadband impedance converter according to claim 7, characterized in that: The even-mode impedance of the first coupling unit is equal to the even-mode impedance of the second coupling unit; The odd-mode impedance of the first coupling unit is equal to the odd-mode impedance of the second coupling unit; The electrical length of the coupling coil pair in the first coupling unit is equal to the electrical length of the coupling coil pair in the second coupling unit; The width of the coupling coil pair in the first coupling unit is equal to the width of the coupling coil pair in the second coupling unit; The even-mode impedance of the coupling coil pair in the first coupling unit is equal to the even-mode impedance of the coupling coil pair in the second coupling unit; The odd-mode impedance of the coupled coil pair in the first coupling unit is equal to the odd-mode impedance of the coupled coil pair in the second coupling unit.

10. An electronic device, characterized in that: A wide-band impedance transformer comprising the device described in any one of claims 1 to 9.

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