Transformer feedback-based voltage-controlled oscillator, and assembling method and apparatus

Abstract

The present invention provides a transformer feedback-based voltage-controlled oscillator, comprising: external coils, the external coils comprising a first coil, a second coil, a third coil, and a fourth coil, the first coil and the third coil forming a first transformer, and the second coil and the fourth coil forming a second transformer; and internal coils, the internal coils being placed in the external coils, the internal coils being coupled to the external coils, the internal coils comprising a fifth coil, a sixth coil, a seventh coil, and an eighth coil, the fifth coil and the eighth coil forming a third transformer, and the sixth coil and the seventh coil forming a fourth transformer. By coupling the internal coils and the external coils, the internal coils generate two symmetrical and opposite magnetic fields, so as to offset a coupling effect between the external coils and the internal coils. An extra transformer does not need to be additionally added inside the voltage-controlled oscillator to ensure the electrical performance, so that the circuit area in the voltage-controlled oscillator is reduced, and therefore the area of a chip of the voltage-controlled oscillator is reduced.

Description

Voltage-controlled oscillator based on transformer feedback, assembly method and device Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to a voltage-controlled oscillator based on transformer feedback and an implementation method thereof. Background Art

[0002] In traditional LC oscillators in the prior art, in order to meet the requirements of oscillation startup and maintain low phase noise performance, the core transistor of the oscillation circuit needs to provide sufficient gain, that is, transconductance. The effect of increasing the gain of the transformer circuit is achieved by introducing transformer feedback in the core tube. However, when the transformer feedback circuit is introduced in the core tube, multiple transformers need to be added, which makes the passive area larger, resulting in the area of ​​the oscillator chip increasing exponentially.

[0003] Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a voltage-controlled oscillator based on transformer feedback and its implementation method. This ensures that the circuits of the primary and secondary coils are connected in a manner that saves circuit area when multiple transformers are required, thereby reducing the area of ​​the oscillator chip.

[0005] In a first aspect, an embodiment of the present invention provides a voltage-controlled oscillator based on transformer feedback, comprising:

[0006] an external coil, the external coil comprising an external primary coil and an external secondary coil, the external primary coil comprising a first coil and a second coil, the external secondary coil comprising a third coil and a fourth coil, the first coil and the third coil being fixedly connected to form a first transformer, the second coil and the fourth coil being fixedly connected to form a second transformer, wherein one end of the first coil and one end of the third coil, as well as one end of the second coil and one end of the fourth coil, constitute like-named ends of the external coil;

[0007] An internal coil, the internal coil is placed inside the external coil, the internal coil and the external coil are coupled to each other, the internal coil includes an internal primary coil and an internal secondary coil, the internal primary coil includes a fifth coil and a sixth coil, the internal secondary coil includes a seventh coil and an eighth coil, the fifth coil and the eighth coil are fixedly connected to form a third transformer, the sixth coil and the seventh coil are fixedly connected to form a fourth transformer, wherein one end of the fifth coil and one end of the seventh coil, as well as one end of the sixth coil and one end of the eighth coil, constitute the same-name ends of the internal coil.

[0008] In some embodiments of the present invention, the third transformer and the fourth transformer are both placed inside the external coil in a figure eight structure.

[0009] In some embodiments of the present invention, the first transformer and the second transformer in the external coil are placed symmetrically to each other.

[0010] In some embodiments of the present invention, the first coil is wound along the inner circumference toward the outer circumference, and the third coil is wound along the inner circumference toward the outer circumference and is stacked on the first coil.

[0011] In some embodiments of the present invention, the fifth coil is placed along the left side of the lower half of the figure-eight structure and the right side of the upper half of the figure-eight structure, and then overlapped with the eighth coil. The eighth coil is placed along the left side of the upper half of the figure-eight structure and the right side of the lower half of the figure-eight structure to complete the placement of the third transformer.

[0012] In some embodiments of the present invention, the sixth coil is placed along the right side of the lower half of the figure-eight structure and the left side of the upper half of the figure-eight structure, and then overlapped with the seventh coil. The seventh coil is placed along the right side of the upper half of the figure-eight structure and the left side of the lower half of the figure-eight structure to complete the placement of the fourth transformer.

[0013] In some embodiments of the present invention, the third transformer and the fourth transformer are symmetrically placed along a center line of the figure eight structure.

[0014] In some embodiments of the present invention, the external primary coil, the external secondary coil, the internal primary coil, and the internal secondary coil are all made of the same layer of metal wires.

[0015] In a second aspect, an embodiment of the present invention provides a method for assembling a voltage-controlled oscillator based on transformer feedback, comprising:

[0016] The first coil and the third coil are fixedly connected to form a first transformer, and the second coil and the fourth coil are fixedly connected to form a second transformer, wherein the first transformer and the second transformer constitute an external coil, one end of the first coil and one end of the third coil are the same end, and one end of the second coil and one end of the fourth coil are the same end;

[0017] The fifth coil and the eighth coil are fixedly connected to form a third transformer, and the sixth coil and the seventh coil are fixedly connected to form a fourth transformer, wherein the third transformer and the fourth transformer constitute internal coils, one end of the fifth coil and one end of the eighth coil are the same end, and one end of the sixth coil and one end of the seventh coil are the same end;

[0018] The inner coil is placed inside the outer coil, wherein the first coil is wound along the inner circumference toward the outer circumference, the third coil is wound along the inner circumference toward the outer circumference and is stacked on the first coil, the fifth coil is placed along the left side of the lower half of the figure-eight structure and the right side of the upper half of the figure-eight structure, and then stacked with the eighth coil, and the eighth coil is placed along the left side of the upper half of the figure-eight structure and the right side of the lower half of the figure-eight structure, thereby completing the placement of the third transformer;

[0019] After the sixth coil is placed along the right side of the lower half of the figure-eight structure and the left side of the upper half of the figure-eight structure, it is overlapped with the seventh coil. The seventh coil is placed along the right side of the upper half of the figure-eight structure and the left side of the lower half of the figure-eight structure, completing the placement of the fourth transformer.

[0020] In a third aspect, an embodiment of the present invention provides a voltage-controlled oscillator device based on transformer feedback, which is used to execute the assembly method of the voltage-controlled oscillator based on transformer feedback as described in the second aspect above.

[0021] The voltage-controlled oscillator based on transformer feedback according to the embodiment of the present invention has at least the following beneficial effects:

[0022] The external coil includes an external primary coil and an external secondary coil, the external primary coil includes a first coil and a second coil, the external secondary coil includes a third coil and a fourth coil, the first coil and the third coil are fixedly connected to form a first transformer, the second coil and the fourth coil are fixedly connected to form a second transformer, wherein one end of the first coil and one end of the third coil, as well as one end of the second coil and one end of the fourth coil constitute the same-named ends of the external coil; the internal coil is placed inside the external coil, the internal coil and the external coil are coupled to each other, the internal coil includes an internal primary coil and an internal secondary coil, the internal primary coil includes a fifth coil and a sixth coil, the internal secondary coil includes a seventh coil and an eighth coil, the fifth coil and the eighth coil are fixedly connected to form a third transformer, the sixth coil and the seventh coil are fixedly connected to form a fourth transformer, wherein one end of the fifth coil and one end of the seventh coil, as well as one end of the sixth coil and one end of the eighth coil constitute the same-named ends of the internal coil. By coupling the first transformer and the second transformer of the external coil with the third transformer and the fourth transformer of the internal coil, the fifth coil and the eighth coil are fixedly connected to form a third transformer, the sixth coil and the seventh coil are fixedly connected to form a fourth transformer, one end of the fifth coil and one end of the seventh coil, as well as one end of the sixth coil and one end of the eighth coil, forming the same-name ends of the internal coil, the internal coil generates two symmetrical and opposite magnetic fields, thereby offsetting the coupling effect between the primary coil and the secondary coil, so that there is no need to add an additional transformer inside the voltage-controlled oscillator to ensure electrical performance, saving circuit area within the voltage-controlled oscillator, and thus reducing the area of ​​the voltage-controlled oscillator chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a structural diagram of an internal coil placed inside an external coil according to an embodiment of the present invention;

[0024] FIG2 is a circuit diagram of an internal coil and an external coil provided by one embodiment of the present invention;

[0025] FIG3 is a flow chart of a method for assembling a voltage-controlled oscillator based on transformer feedback according to an embodiment of the present invention.

[0026] FIG4 is a structural diagram of a load transfer device provided in another embodiment of the present invention.

[0027] Reference numerals:

[0028] 100, external coil; 110, external primary coil; 120, external secondary coil; 200, internal coil; 210, internal primary coil; 220, internal secondary coil. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] 1 and 2 , an embodiment of the present invention provides a voltage-controlled oscillator based on transformer feedback, including:

[0034] The external coil 100 includes an external primary coil 110 and an external secondary coil 120. The external primary coil 110 includes a first coil Q1 and a second coil Q2. The external secondary coil 120 includes a third coil Q3 and a fourth coil Q4. The first coil Q1 and the third coil Q3 are fixedly connected to form a first transformer. The second coil Q2 and the fourth coil Q4 are fixedly connected to form a second transformer. One end of the first coil Q1 and one end of the third coil Q3, as well as one end of the second coil Q2 and one end of the fourth coil Q4, constitute the same-named ends of the external coil 100. The internal coil 200 is placed on the external coil. Within the coil 100, the internal coil 200 is coupled to the external coil 100. The internal coil 200 includes an internal primary coil 210 and an internal secondary coil 220. The internal primary coil 210 includes a fifth coil Q5 and a sixth coil Q6. The internal secondary coil 220 includes a seventh coil Q7 and an eighth coil Q8. The fifth coil Q5 and the eighth coil Q8 are fixedly connected to form a third transformer, and the sixth coil Q6 and the seventh coil Q7 are fixedly connected to form a fourth transformer. One end of the fifth coil Q5 and one end of the seventh coil Q7, as well as one end of the sixth coil Q6 and one end of the eighth coil Q8, form like-named ends of the internal coil 200. By coupling the first and second transformers of the external coil 100 with the third and fourth transformers of the internal coil 200, the fifth coil Q5 and the eighth coil Q8 are fixedly connected to form a third transformer, and the sixth coil Q6 and the seventh coil Q7 are fixedly connected to form a fourth transformer. One end of the fifth coil Q5 and one end of the seventh coil Q7, as well as one end of the sixth coil Q6 and one end of the eighth coil Q8, form the same-name ends of the internal coil 200. This allows the internal coil 200 to generate two symmetrical and opposite magnetic fields, thereby offsetting the coupling effect between the external coil 100 and the internal coil 200. This eliminates the need for an additional transformer within the voltage-controlled oscillator to ensure electrical performance, saves circuit area within the voltage-controlled oscillator, and thus reduces the area of ​​the voltage-controlled oscillator chip.

[0035] It is worth noting that the embodiment of the present application places the internal coil 200 inside the external coil 100, but this placement often produces a coupling effect, making it difficult to maintain the loop relationship in the circuit. In this embodiment, the fifth coil Q5 and the eighth coil Q8 in the internal coil are fixedly connected to form a third transformer, and the sixth coil Q6 and the seventh coil Q7 are fixedly connected to form a fourth transformer. Specifically, the internal primary coil 210 and the internal secondary coil 220 of the third transformer and the fourth transformer are placed in the external coil 100 in an eight-shaped structure. At this time, the current flow directions of the upper and lower parts of the eight-shaped structure of the internal coil 200 are opposite, and two symmetrical and opposite magnetic fields are generated, thereby offsetting the coupling effect generated after the internal coil is placed in the external coil, ensuring that the internal coil and the external coil can work relatively independently. Among them, the twisted topology of the eight-shaped transformer has the ability to resist interference from the magnetic coupling of adjacent inductors, allowing the eight-shaped transformer to work in an environment with strong magnetic induction.

[0036] The third transformer and the fourth transformer are both placed inside the external coil 100 in a figure-eight structure. By placing the third transformer and the fourth transformer inside the external coil 100 in a figure-eight structure, magnetic field leakage during transformer operation is reduced, and the impact of external electromagnetic interference on the transformer is reduced. In addition, the figure-eight structure can effectively utilize space and arrange the coils of the third transformer and the fourth transformer more compactly. In a limited installation space or a high-density wiring environment, the power density and assembly efficiency of the internal and external coils are improved.

[0037] Furthermore, the first transformer and the second transformer in the external coil 100 are placed symmetrically with each other. By placing the first transformer and the second transformer symmetrically with each other, a balanced distribution of the magnetic field of the external coil 100 and the symmetry of the coil are achieved, thereby improving the conversion efficiency, power transmission capability and voltage stability of the external coil 100. In addition, the symmetrical placement of the first transformer and the second transformer can reduce the interference of the same source signals between the voltage-controlled oscillators, further improving the stability and operating efficiency of the external coil 100.

[0038] It is worth noting that by placing the first transformer and the second transformer symmetrically with each other, disturbances can be reduced. For example, asymmetry of external current or external voltage may increase the instability of the transformer output. Symmetrical placement can improve the stability and reliability of the transformer.

[0039] As a further optional embodiment, the first coil Q1 is wound from the inner circumference toward the outer circumference, and the third coil Q3 is wound from the inner circumference toward the outer circumference and stacked on the first coil Q1. By stacking the third coil Q3 with the first coil Q1, the mutual inductance effect between the first coil Q1 and the third coil Q3 is enhanced, thereby achieving higher energy transmission efficiency and signal coupling. Furthermore, by stacking the third coil Q3 on the first coil Q1, a compact coil layout is achieved, thereby reducing the number of transformers in the voltage-controlled oscillator and the layout area of ​​the external coils.

[0040] Specifically, after one end of the first coil Q1 is placed, it is wound along the inner circumference of the external coil 100, and the winding shape is adapted to the outer circumference shape of the internal coil 200. After the first coil Q1 is wound around one circle, the other end of the first coil Q1 is stacked and placed on one end of the second coil Q2; after one end of the second coil Q2 is fixed, it is placed along the outer edge of the first coil Q1, and after winding half a circle, the other end of the second coil Q2 is fixed; after one end of the third coil Q3 is placed, it is wound along the inner circumference of the external coil 100, and the winding shape is adapted to the outer circumference shape of the internal coil 200. After the third coil Q3 is wound around one circle, the other end of the third coil Q3 is stacked and placed on one end of the fourth coil Q4; after one end of the fourth coil Q4 is fixed, it is placed along the outer edge of the third coil Q3, and after winding half a circle, the other end of the fourth coil Q4 is fixed, thereby completing the placement of the external coil 100.

[0041] After the fifth coil Q5 is placed along the left side of the lower half and the right side of the upper half of the figure-eight structure, it is stacked with the eighth coil Q8. The eighth coil Q8 is also stacked along the left side of the upper half and the right side of the lower half of the figure-eight structure, completing the placement of the third transformer. By stacking the fifth coil Q5 and the eighth coil Q8 at different locations along the figure-eight structure, the mutual inductance between the fifth coil Q5 and the eighth coil Q8 is enhanced, the compact layout of the internal coil 200 is strengthened, and the flexibility of the transformer arrangement within the internal coils is increased. By optimizing the layout and stacking of the fifth coil Q5 and the eighth coil Q8, the electromagnetic characteristics of the voltage-controlled oscillator are further improved, thereby enhancing the stability of the transformer circuit.

[0042] Specifically, when placing the internal coil 200, one end of the fifth coil Q5 is fixed, and the fifth coil Q5 is placed along the left side of the lower half of the figure-eight structure and the right side of the upper half of the figure-eight structure, and the other end of the fifth coil Q5 is placed, and one end of the eighth coil Q8 is stacked with the other end of the fifth coil Q5. After one end of the eighth coil Q8 is placed, the eighth coil Q8 is placed along the left side of the upper half of the figure-eight structure and the right side of the lower half of the figure-eight structure, and the other end of the eighth coil Q8 is placed, thereby completing the placement of the third transformer.

[0043] After the sixth coil Q6 is placed along the right side of the lower half of the figure-eight structure and the left side of the upper half of the figure-eight structure, it is stacked with the seventh coil Q7. The seventh coil Q7 is then placed along the right side of the upper half of the figure-eight structure and the left side of the lower half of the figure-eight structure, completing the placement of the fourth transformer. It is worth noting that one end of the sixth coil Q6 is fixed, and the sixth coil Q6 is placed along the right side of the lower half of the figure-eight structure and the left side of the upper half of the figure-eight structure. The other end of the sixth coil Q6 is then placed, and one end of the seventh coil Q7 is stacked with the other end of the sixth coil Q6. After one end of the seventh coil Q7 is placed, the seventh coil Q7 is placed along the right side of the upper half of the figure-eight structure and the left side of the lower half of the figure-eight structure, and the other end of the seventh coil Q7 is placed, thus completing the placement of the fourth transformer.

[0044] Among them, the third transformer and the fourth transformer are symmetrically placed along the center line of the figure-eight structure, so that the magnetic fields of the third transformer and the fourth transformer are evenly distributed in the figure-eight structure, reducing the magnetic field imbalance caused by leakage magnetic flux. In addition, when placing multiple transformers, they can be placed at a time along the left and right sides of the upper and lower parts of the figure-eight structure. When the transformer circuit needs to use multiple transformers, the area of ​​the transformer circuit is saved to the maximum extent, thereby reducing the chip area of ​​the voltage-controlled oscillator.

[0045] It is worth noting that the external coil 100 and the internal coil 200 are mutually coupled, and the internal coil 200 is a same-layer metal figure-eight transformer coil, which has obvious features and is easy to identify.

[0046] As a further optional embodiment, the external primary coil 110, the external secondary coil 120, the internal primary coil 210 and the internal secondary coil 220 are all made of the same layer of metal wires. The same layer of metal wires has lower metal properties, can effectively reduce resistance loss, improve the efficiency of energy transmission between transformers, reduce transmission loss in the transformer, and make the coils have a higher quality factor and symmetry.

[0047] 3 , an embodiment of the present application further provides a method for assembling a voltage-controlled oscillator based on transformer feedback, comprising:

[0048] S100: Fixedly connect the first coil and the third coil to form a first transformer, and fixedly connect the second coil and the fourth coil to form a second transformer, wherein the first transformer and the second transformer constitute an external coil, one end of the first coil and one end of the third coil are the same-named ends, and one end of the second coil and one end of the fourth coil are the same-named ends;

[0049] S200: Fixedly connect the fifth coil and the eighth coil to form a third transformer, and fixedly connect the sixth coil and the seventh coil to form a fourth transformer, wherein the third transformer and the fourth transformer constitute internal coils, one end of the fifth coil and one end of the eighth coil are the same end, and one end of the sixth coil and one end of the seventh coil are the same end;

[0050] S300: Placing the inner coil inside the outer coil, wherein the first coil is wound from the inner circumference toward the outer circumference, the third coil is wound from the inner circumference toward the outer circumference and stacked on the first coil, the fifth coil is placed along the left side of the lower half of the figure-eight structure and the right side of the upper half of the figure-eight structure, and then stacked with the eighth coil. The eighth coil is placed along the left side of the upper half of the figure-eight structure and the right side of the lower half of the figure-eight structure, completing the placement of the third transformer;

[0051] S400, after the sixth coil is placed along the right side of the lower half of the figure-eight structure and the left side of the upper half of the figure-eight structure, it is overlapped with the seventh coil. The seventh coil is placed along the right side of the upper half of the figure-eight structure and the left side of the lower half of the figure-eight structure, completing the placement of the fourth transformer.

[0052] The above-mentioned assembly method of the voltage-controlled oscillator based on transformer feedback is as follows: the first transformer and the second transformer of the external coil are coupled with the third transformer and the fourth transformer of the internal coil, the fifth coil and the eighth coil are fixedly connected to form a third transformer, the sixth coil and the seventh coil are fixedly connected to form a fourth transformer, one end of the fifth coil and one end of the seventh coil, and one end of the sixth coil and one end of the eighth coil form the same-name ends of the internal coil, so that the internal coil generates two symmetrical and opposite magnetic fields, thereby offsetting the coupling effect between the primary coil and the secondary coil, so that there is no need to add an additional transformer inside the voltage-controlled oscillator to ensure electrical performance, saving the circuit area inside the voltage-controlled oscillator, and thus reducing the area of ​​the voltage-controlled oscillator chip.

[0053] In the third aspect, as shown in FIG4 , FIG4 is a structural diagram of a voltage-controlled oscillator based on transformer feedback provided by an embodiment of the present invention. The present invention also provides a voltage-controlled oscillator based on transformer feedback, comprising:

[0054] The processor 401 may be implemented as a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is configured to execute relevant programs to implement the technical solutions provided in the embodiments of the present application.

[0055] The memory 402 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 402 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 402 and is called by the processor 401 to execute the assembly method of the voltage-controlled oscillator based on transformer feedback according to the embodiments of this application.

[0056] Input / output interface 403, used to implement information input and output;

[0057] Communication interface 404, used to implement communication interaction between the apparatus and other devices, which can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WiFi, Bluetooth, etc.);

[0058] Bus 405 , which transmits information between various components of the device (e.g., processor 401 , memory 402 , input / output interface 403 , and communication interface 404 );

[0059] The processor 401 , the memory 402 , the input / output interface 403 and the communication interface 404 are connected to each other in communication within the device via a bus 405 .

[0060] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation. Those skilled in the art can also make various equivalent modifications or substitutions under the shared conditions that do not violate the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A voltage-controlled oscillator based on transformer feedback, characterized in that: include: An external coil, the external coil comprising an external primary coil and an external secondary coil, the external primary coil comprising a first coil and a second coil, the external secondary coil comprising a third coil and a fourth coil, the first coil and the third coil are fixedly connected to form a first transformer, the second coil and the fourth coil are fixedly connected to form a second transformer, wherein one end of the first coil and one end of the third coil, and one end of the second coil and one end of the fourth coil constitute the same-named ends of the external coil; An internal coil, wherein the internal coil is placed inside the external coil, the internal coil and the external coil are coupled to each other, the internal coil comprises an internal primary coil and an internal secondary coil, the internal primary coil comprises a fifth coil and a sixth coil, the external secondary coil comprises a seventh coil and an eighth coil, the fifth coil and the eighth coil are fixedly connected to form a third transformer, the sixth coil and the seventh coil are fixedly connected to form a fourth transformer, wherein one end of the fifth coil and one end of the seventh coil, as well as one end of the sixth coil and one end of the eighth coil constitute the same-name ends of the internal coil.

2. The voltage controlled oscillator based on transformer feedback according to claim 1, characterized in that: The third transformer and the fourth transformer are both placed inside the external coil in an eight-shaped structure.

3. The voltage controlled oscillator based on transformer feedback according to claim 1, characterized in that: The first transformer and the second transformer in the external coil are placed symmetrically to each other.

4. The voltage controlled oscillator based on transformer feedback according to claim 1, characterized in that: The first coil is wound from the inner circumference to the outer circumference, and the third coil is wound from the inner circumference to the outer circumference and is stacked on the first coil.

5. The voltage controlled oscillator based on transformer feedback according to claim 2, characterized in that: After the fifth coil is placed along the left side of the lower half of the figure-eight structure and the right side of the upper half of the figure-eight structure, it is overlapped with the eighth coil, and the eighth coil is placed along the left side of the upper half of the figure-eight structure and the right side of the lower half of the figure-eight structure, completing the placement of the third transformer.

6. The voltage controlled oscillator based on transformer feedback according to claim 2, characterized in that: After the sixth coil is placed along the right side of the lower half of the figure-eight structure and the left side of the upper half of the figure-eight structure, it is overlapped with the seventh coil. The seventh coil is placed along the right side of the upper half of the figure-eight structure and the left side of the lower half of the figure-eight structure, completing the placement of the fourth transformer.

7. The voltage controlled oscillator based on transformer feedback according to claim 2, characterized in that: The third transformer and the fourth transformer are symmetrically placed along a center line of the figure eight structure.

8. The voltage controlled oscillator based on transformer feedback according to claim 1, characterized in that: The external primary coil, the external secondary coil, the internal primary coil and the internal secondary coil are all made of metal wires of the same layer.

9. A method for assembling a voltage-controlled oscillator based on transformer feedback, characterized in that: include: The first coil and the third coil are fixedly connected to form a first transformer, and the second coil and the fourth coil are fixedly connected to form a second transformer, the first transformer and the second transformer constitute an external coil, one end of the first coil and one end of the third coil are the same end, and one end of the second coil and one end of the fourth coil are the same end; The fifth coil and the eighth coil are fixedly connected to form a third transformer, and the sixth coil and the seventh coil are fixedly connected to form a fourth transformer, wherein the third transformer and the fourth transformer constitute internal coils, one end of the fifth coil and one end of the eighth coil are the same end, and one end of the sixth coil and one end of the seventh coil are the same end; The inner coil is placed inside the outer coil, wherein the first coil is wound along the inner circumference toward the outer circumference, the third coil is wound along the inner circumference toward the outer circumference and is stacked on the first coil, the fifth coil is placed along the left side of the lower half of the figure-eight structure and the right side of the upper half of the figure-eight structure, and then is stacked with the eighth coil, the eighth coil is placed along the left side of the upper half of the figure-eight structure and the right side of the lower half of the figure-eight structure, and the third transformer is placed; After the sixth coil is placed along the right side of the lower half of the figure-eight structure and the left side of the upper half of the figure-eight structure, it is overlapped with the seventh coil. The seventh coil is placed along the right side of the upper half of the figure-eight structure and the left side of the lower half of the figure-eight structure, completing the placement of the fourth transformer.

10. A voltage-controlled oscillator device based on transformer feedback, characterized in that: It includes at least one control processor and a memory for communicating with the at least one control processor; the memory stores instructions that can be executed by the at least one control processor, and the instructions are executed by the at least one control processor to enable the at least one control processor to execute the voltage-controlled oscillator assembly method based on transformer feedback as described in claim 9.

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