Butterfly-shaped cross main tail inductor for voltage-controlled oscillator

Abstract

The invention provides a butterfly-shaped cross main tail inductor for a voltage-controlled oscillator, relates to the technical field of phase noise optimization of the voltage-controlled oscillator, and aims to realize phase noise optimization of the voltage-controlled oscillator on the premise of not occupying more area. The butterfly-shaped crossed main and tail inductor comprises a main inductor formed by winding a splayed metal wire, a tail inductor formed by winding a splayed metal wire, two metal interlayer through holes, two main inductor ports and two tail inductor ports; the main inductor is used for providing an inductance value required by resonance of the LC voltage-controlled oscillator; the tail inductor is used for filtering noise generated by the tail current source and improving the impedance of a common mode point, so that the overall phase noise performance of the voltage-controlled oscillator is improved; and the metal interlayer through hole, the main inductor port and the tail inductor port are used for providing inductor wiring and circuit interfaces. The voltage-controlled oscillator is simple in structure, phase noise can be reduced without improving the design of the voltage-controlled oscillator, meanwhile, occupied area is reduced, and the voltage-controlled oscillator has very high cost performance.

Description

Technical Field

[0001] This invention belongs to the field of phase noise optimization technology for voltage-controlled oscillators, and particularly relates to a butterfly-shaped cross tail inductor for voltage-controlled oscillators. Background Technology

[0002] Voltage-controlled oscillators (VCOs) are widely used in modern communication, radar, and electronic systems, such as 5G communication, satellite navigation, and automotive electronics, to provide adjustable frequencies controlled by the input voltage. As the demands of wireless communication increase, oscillators must possess low phase noise. Because the phase noise performance of ring VCOs is significantly worse than that of LC VCOs, LC VCOs are typically chosen in modern RF systems.

[0003] Inductors are a crucial component of LC voltage-controlled oscillators (VCOs), occupying a significant portion of their area. Introducing an additional tail inductor is a popular method to further suppress phase noise in LC VCOs, including second harmonic resonance filtering and source-level inductor negative feedback, among other approaches. However, this often comes at the cost of sacrificing a substantial amount of area. For example, using source-level inductor negative feedback to reduce phase noise can ideally reduce it by approximately 10 dB, but this requires introducing three additional filter inductors, resulting in an unacceptable waste of area in practical applications.

[0004] Therefore, the urgent problem to be solved for LC voltage-controlled oscillators is to minimize phase noise within a limited area, thereby ensuring the low-noise performance of LC voltage-controlled oscillators. Summary of the Invention

[0005] The purpose of this invention is to provide a butterfly-shaped cross-tail inductor for voltage-controlled oscillators (VCOs), which can reduce the phase noise of VCOs within a limited area. This solves the technical problem in the prior art where reducing phase noise comes at the cost of sacrificing area.

[0006] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows:

[0007] A butterfly-shaped cross-tail inductor for a voltage-controlled oscillator, the butterfly-shaped cross-tail inductor comprising a main inductor wound with a figure-eight metal wire, a tail inductor wound with a figure-eight metal wire, two metal interlayer vias, two main inductor ports and two tail inductor ports.

[0008] The main inductor, which is made of figure-eight shaped metal wire, includes two main inductor loops and a main inductor connecting line. The two ends of the main inductor connecting line are respectively connected to one end of a main inductor loop, and the other end of each main inductor loop is connected to the main inductor port.

[0009] The tail inductance formed by winding the eight-shaped metal wire comprises two tail inductance rings and a tail inductance connecting line, two ends of the tail inductance connecting line are connected to one end of one tail inductance ring respectively, and the other end of each tail inductance ring is connected to a tail inductance port.

[0010] The main inductance formed by winding the eight-shaped metal wire and the tail inductance formed by winding the eight-shaped metal wire are centrally symmetric and are arranged in the same process multi-layer metal, wherein the main inductance formed by winding the eight-shaped metal wire, two main inductance ports and two tail inductance ports are arranged in the top layer of the metal layer, and the tail inductance formed by winding the eight-shaped metal wire is arranged in the second layer of the metal layer.

[0011] The metal layer through hole is used for connecting the tail inductance ring and the tail inductance port of two metal layers.

[0012] The main inductance port and the tail inductance port are used for connecting the inductance and the voltage-controlled oscillator circuit.

[0013] Further, the main inductance formed by winding the eight-shaped metal wire comprises an eight-shaped main inductance first ring, an eight-shaped main inductance second ring and a main inductance connecting line.

[0014] The eight-shaped main inductance first ring and the eight-shaped main inductance second ring are connected through the main inductance connecting line, the eight-shaped main inductance first ring is arranged in the first quadrant of the coordinate system with the center as the origin, the eight-shaped main inductance second ring is arranged in the third quadrant of the coordinate system, and the main inductance connecting line is located on the longitudinal coordinate axis of the coordinate system.

[0015] The main inductance port comprises a main inductance first port and a main inductance second port.

[0016] The main inductance first port is located on the side close to the horizontal coordinate axis in the fourth quadrant, is connected to the eight-shaped main inductance first ring and is bent to the outside of the eight-shaped main inductance; and the main inductance second port is located on the side close to the horizontal coordinate axis in the second quadrant, is connected to the eight-shaped main inductance second ring and is bent to the outside of the eight-shaped main inductance.

[0017] Further, the tail inductance formed by winding the eight-shaped metal wire comprises an eight-shaped tail inductance first ring, an eight-shaped tail inductance second ring and a tail inductance connecting line.

[0018] The eight-shaped tail inductance first ring and the eight-shaped tail inductance second ring are connected through the tail inductance connecting line, the eight-shaped tail inductance first ring is arranged in the second quadrant of the coordinate system, the eight-shaped tail inductance second ring is arranged in the fourth quadrant of the coordinate system, and the tail inductance connecting line is located on the horizontal coordinate axis of the coordinate system.

[0019] The tail inductance port comprises a tail inductance first port and a tail inductance second port.

[0020] The first port of the tail inductor is located near the longitudinal coordinate axis on the second quadrant side, and is bent to the inside of the eight-shaped tail inductor.

[0021] Further, the first ring of the eight-shaped main inductor, the second ring of the eight-shaped main inductor, the first port of the main inductor, the second port of the main inductor, the main inductor connecting line, the first port of the tail inductor and the second port of the tail inductor are located on the top layer of the metal layer; the first ring of the eight-shaped tail inductor, the second ring of the eight-shaped tail inductor and the tail inductor connecting line are located on the second layer of the metal layer.

[0022] The metal interlayer via hole includes a first metal interlayer via hole and a second metal interlayer via hole, the first metal interlayer via hole is located in the second quadrant of the coordinate system, and the second metal interlayer via hole is located in the fourth quadrant of the coordinate system.

[0023] The first metal interlayer via hole connects the first ring of the eight-shaped tail inductor and the first port of the tail inductor, and the second metal interlayer via hole connects the second ring of the eight-shaped tail inductor and the second port of the tail inductor.

[0024] Further, the main inductor wound by the eight-shaped metal wire includes the first ring of the eight-shaped main inductor, the second ring of the eight-shaped main inductor and the main inductor connecting line.

[0025] Optionally, the first ring of the eight-shaped main inductor and the second ring of the eight-shaped main inductor are connected by the main inductor connecting line, the first ring of the eight-shaped main inductor is arranged in the second quadrant of the coordinate system with the center as the origin, the second ring of the eight-shaped main inductor is arranged in the fourth quadrant of the coordinate system, and the main inductor connecting line is located on the horizontal coordinate axis of the coordinate system.

[0026] The main inductor port includes the first port of the main inductor and the second port of the main inductor.

[0027] The first port of the main inductor is located near the horizontal coordinate axis on the second quadrant side, connected to the first ring of the eight-shaped main inductor and bent to the inside of the eight-shaped main inductor; and the second port of the main inductor is located near the horizontal coordinate axis on the fourth quadrant side, connected to the second ring of the eight-shaped main inductor and bent to the inside of the eight-shaped main inductor.

[0028] Further, the tail inductor wound by the eight-shaped metal wire includes the first ring of the eight-shaped tail inductor, the second ring of the eight-shaped tail inductor and the tail inductor connecting line.

[0029] Optionally, the first ring of the eight-shaped tail inductor and the second ring of the eight-shaped tail inductor are connected by the tail inductor connecting line, the first ring of the eight-shaped tail inductor is arranged in the first quadrant of the coordinate system, the second ring of the eight-shaped tail inductor is arranged in the third quadrant of the coordinate system, and the tail inductor connecting line is located on the longitudinal coordinate axis of the coordinate system.

[0030] The tail inductance ports comprise a tail inductance first port and a tail inductance second port.

[0031] The tail inductance first port is located on the side close to the horizontal coordinate axis in the fourth quadrant and is bent to the outside of the eight-shaped tail inductance.

[0032] Further, the eight-shaped main inductance first ring, the eight-shaped main inductance second ring, the main inductance first port, the main inductance second port, the main inductance connecting line, the tail inductance first port and the tail inductance second port are located on the top layer of the metal layer. The eight-shaped tail inductance first ring, the eight-shaped tail inductance second ring and the tail inductance connecting line are located on the second layer of the metal layer.

[0033] The metal layer interconnection holes comprise a first metal layer interconnection hole and a second metal layer interconnection hole. The first metal layer interconnection hole is located in the fourth quadrant of the coordinate system, and the second metal layer interconnection hole is located in the second quadrant of the coordinate system.

[0034] The first metal layer interconnection hole connects the eight-shaped tail inductance first ring and the tail inductance first port, and the second metal layer interconnection hole connects the eight-shaped tail inductance second ring and the tail inductance second port.

[0035] Further, the eight-shaped main inductance first ring and the eight-shaped main inductance second ring are symmetrically distributed about the origin of the coordinate system, and the eight-shaped tail inductance first ring and the eight-shaped tail inductance second ring are symmetrically distributed about the origin of the coordinate system.

[0036] Further, the main inductance first port and the main inductance second port are symmetrically distributed about the origin of the coordinate system, and the tail inductance first port and the tail inductance second port are symmetrically distributed about the origin of the coordinate system.

[0037] Further, the main inductance wound by the eight-shaped metal wire is connected to the resonant loop of any LC voltage-controlled oscillator through the main inductance port to provide the frequency required for resonance, and the tail inductance wound by the eight-shaped metal wire is connected to the common mode point of the tail current of the voltage-controlled oscillator through the tail inductance port. The frequency generated by the butterfly-shaped cross main-tail inductance in the resonant loop can be expressed as:

[0038]

[0039]

[0040] wherein, f is the resonant frequency of the main inductance in the butterfly-shaped cross main-tail inductance, L is the inductance value of the main inductance wound by the eight-shaped metal wire, C is the main capacitance value of the voltage-controlled oscillator, The resonant frequency of the tail inductance of the butterfly-shaped cross main tail inductance is provided with a filter function at the frequency value of the second harmonic, The inductance value of the tail inductance wound in the shape of an eight-character metal line, The filter capacitance value.

[0041] Compared with the prior art, the present application has the following beneficial technical effects:

[0042] 1) The present application optimizes the inductance structure distribution on the basis of the conventional inductance used for the LC voltage-controlled oscillator, introduces tail inductance, and realizes the optimization of the phase noise of the LC voltage-controlled oscillator through simple improvement.

[0043] 2) The present application sets two groups of symmetrical eight-character-shaped inductances, which helps to improve the utilization efficiency of the chip area and further realize the reduction of the phase noise of the voltage-controlled oscillator under the effective area.

[0044] 3) The present application uses intermetallic vias to realize the wiring of the main inductance and the tail inductance in different metal layers, avoids short circuit and interference between inductances, and at the same time, the eight-character-shaped inductance winding method can make the magnetic fields of the inductances offset each other, reducing the interference on other circuit modules.

[0045] 4) The present application has reasonable design and simple structure, and can reduce the phase noise without improving the design of the voltage-controlled oscillator itself, while reducing the area occupation as much as possible, is easy to manufacture, and has high cost performance. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0047] Figure 1 A structure schematic diagram of a butterfly-shaped cross main tail inductance for a voltage-controlled oscillator is provided.

[0048] Figure 2 A circuit structure schematic diagram of the butterfly-shaped cross main tail inductance applied to a voltage-controlled oscillator is provided.

[0049] Figure 3 Another structure schematic diagram of a butterfly-shaped cross main tail inductance for a voltage-controlled oscillator is provided.

[0050] Marked description in the figure: 101 - main inductance first ring of eight-shaped, 102 - main inductance second ring of eight-shaped, 103 - main inductance first port, 104 - main inductance second port, 105 - main inductance connecting line, 201 - tail inductance first ring of eight-shaped, 202 - tail inductance second ring of eight-shaped, 203 - tail inductance first port, 204 - tail inductance second port, 205 - tail inductance connecting line, 206 - first metal interlayer via, 207 - second metal interlayer via. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0052] Embodiment 1

[0053] The embodiment provides a butterfly-shaped cross main-tail inductance for a voltage-controlled oscillator, as shown in the figure, the butterfly-shaped cross main-tail inductance comprises a main inductance wound by an eight-shaped metal wire, a tail inductance wound by an eight-shaped metal wire, two metal interlayer vias, two main inductance ports and two tail inductance ports. Figure 1

[0054] The main inductance wound by the eight-shaped metal wire comprises two main inductance rings and a main inductance connecting line, two ends of the main inductance connecting line are respectively connected to one end of one main inductance ring, and the other end of each main inductance ring is connected to a main inductance port.

[0055] The tail inductance wound by the eight-shaped metal wire comprises two tail inductance rings and a tail inductance connecting line, two ends of the tail inductance connecting line are respectively connected to one end of one tail inductance ring, and the other end of each tail inductance ring is connected to a tail inductance port.

[0056] The main inductance wound by the eight-shaped metal wire and the tail inductance wound by the eight-shaped metal wire are centrally symmetric and are arranged in the same process multi-layer metal, wherein the main inductance wound by the eight-shaped metal wire, the two main inductance ports and the two tail inductance ports are arranged in the top layer of the metal layer, and the tail inductance wound by the eight-shaped metal wire is arranged in the second layer of the metal layer.

[0057] The metal interlayer via is used for connecting the tail inductance ring and the tail inductance port of two metal layers.

[0058] The main inductance port and the tail inductance port are used for connecting the inductance and the voltage-controlled oscillator circuit.

[0059] ​The main inductor formed by winding the eight-shaped metal wire comprises an eight-shaped main inductor first ring 101, an eight-shaped main inductor second ring 102 and a main inductor connecting line 105.

[0060] The eight-shaped main inductor first ring 101 and the eight-shaped main inductor second ring 102 are connected through the main inductor connecting line 105, the eight-shaped main inductor first ring 101 is arranged in the first quadrant of the coordinate system with the center as the origin, the eight-shaped main inductor second ring 102 is arranged in the third quadrant of the coordinate system, and the main inductor connecting line 105 is located on the longitudinal coordinate axis of the coordinate system.

[0061] The main inductor port comprises a main inductor first port 103 and a main inductor second port 104; and the tail inductor port comprises a tail inductor first port 203 and a tail inductor second port 204.

[0062] The main inductor first port 103 is located on the side close to the horizontal coordinate axis in the fourth quadrant, is connected to the eight-shaped main inductor first ring 101 and is bent to the outside of the eight-shaped main inductor; and the main inductor second port 104 is located on the side close to the horizontal coordinate axis in the second quadrant, is connected to the eight-shaped main inductor second ring 102 and is bent to the outside of the eight-shaped main inductor.

[0063] The eight-shaped main inductor first ring 101, the eight-shaped main inductor second ring 102, the main inductor first port 103, the main inductor second port 104, the main inductor connecting line 105, the tail inductor first port 203 and the tail inductor second port 204 are located on the topmost layer of the metal layer. The eight-shaped tail inductor first ring 201, the eight-shaped tail inductor second ring 202 and the tail inductor connecting line 205 are located on the second layer of the metal layer.

[0064] The tail inductor formed by winding the eight-shaped metal wire comprises an eight-shaped tail inductor first ring 201, an eight-shaped tail inductor second ring 202 and a tail inductor connecting line 205.

[0065] The eight-shaped tail inductor first ring 201 and the eight-shaped tail inductor second ring 202 are connected through the tail inductor connecting line 205, the eight-shaped tail inductor first ring 201 is arranged in the second quadrant of the coordinate system, the eight-shaped tail inductor second ring 202 is arranged in the fourth quadrant of the coordinate system, and the tail inductor connecting line 205 is located on the horizontal coordinate axis of the coordinate system.

[0066] The tail inductor first port 203 is located on the side close to the longitudinal coordinate axis in the second quadrant and is bent to the inside of the eight-shaped tail inductor; and the tail inductor second port 204 is located on the side close to the longitudinal coordinate axis in the fourth quadrant and is bent to the inside of the eight-shaped tail inductor.

[0067] The metal interlayer via includes a first metal interlayer via 206 and a second metal interlayer via 207, the first metal interlayer via 206 is located in the second quadrant of the coordinate system, and the second metal interlayer via 207 is located in the fourth quadrant of the coordinate system.

[0068] The first metal interlayer via 206 connects the first loop 201 of the eight-shaped tail inductor and the first port 203 of the tail inductor, and the second metal interlayer via 207 connects the second loop 202 of the eight-shaped tail inductor and the second port 204 of the tail inductor.

[0069] The first loop 101 of the eight-shaped main inductor and the second loop 102 of the eight-shaped main inductor are symmetrically distributed about the origin of the coordinate system.

[0070] The first loop 201 of the eight-shaped tail inductor and the second loop 202 of the eight-shaped tail inductor are symmetrically distributed about the origin of the coordinate system.

[0071] The first port 103 of the main inductor and the second port 104 of the main inductor are symmetrically distributed about the origin of the coordinate system, and the first port 203 of the tail inductor and the second port 204 of the tail inductor are symmetrically distributed about the origin of the coordinate system.

[0072] Based on the technical solution of the embodiment, the first port 103 of the main inductor and the second port 104 of the main inductor are connected to the resonant loop of any LC voltage-controlled oscillator to provide the required frequency for resonance, and the first port 203 of the tail inductor and the second port 204 of the tail inductor are connected to the common mode point of the tail current of the voltage-controlled oscillator to form a resonant loop with the tail current filter capacitor of the voltage-controlled oscillator and resonate at the second harmonic of the resonant frequency of the voltage-controlled oscillator. Since the main inductor wound by the eight-shaped metal wire and the tail inductor wound by the eight-shaped metal wire are cross-symmetrically arranged about the coordinate system, the magnetic fields of the inductors do not interfere with each other, and the area is saved. The frequency generated by the butterfly-shaped cross main-tail inductor in the resonant loop can be expressed as:

[0073]

[0074]

[0075] wherein, f is the resonant frequency of the main inductor in the butterfly-shaped cross main-tail inductor, L is the inductance value of the main inductor wound by the eight-shaped metal wire, C is the main capacitance value of the voltage-controlled oscillator, f is the resonant frequency of the tail inductor in the butterfly-shaped cross main-tail inductor, and the frequency value is located at the second harmonic to provide a filtering function, L is the inductance value of the tail inductor wound by the eight-shaped metal wire, C is the filter capacitance value.

[0076] Based on the above, the butterfly-shaped cross main-tail inductance can be used for low phase noise and low area requirement of the voltage-controlled oscillator, and helps to improve the noise performance of the voltage-controlled oscillator.

[0077] Based on the above butterfly-shaped cross main-tail inductance, how the butterfly-shaped cross main-tail inductance is applied to the voltage-controlled oscillator is further described. Figure 2 A principle diagram of a voltage-controlled oscillator based on the butterfly-shaped cross main-tail inductance provided by the embodiment of the application is shown. The voltage-controlled oscillator includes a main inductance of a resonant loop composed of a first ring of a main inductance 101, a second ring of a main inductance 102, a first port of a main inductance 103, a second port of a main inductance 104, and a connection line of a main inductance 105, a tail inductance of a resonant loop composed of a first ring of a tail inductance 201, a second ring of a tail inductance 202, a first port of a tail inductance 203, a second port of a tail inductance 204, a connection line of a tail inductance 205, a first metal interlayer via 206, and a second metal interlayer via 207, and a voltage-controlled oscillator component.

[0078] It should be noted that in the present application, the internal structure of the voltage-controlled oscillator component is not specifically limited, and can be specifically adjusted according to the actual application scenario.

[0079] The method for realizing voltage-controlled oscillation of the butterfly-shaped cross main-tail inductance for the voltage-controlled oscillator is as follows:

[0080] The main inductance formed by winding the main inductance of the eight-shaped metal line is connected to the LC oscillation loop of the voltage-controlled oscillator through the first port of the main inductance and the second port of the main inductance, and provides the required main inductance value, and the capacitance value changes according to the voltage control:

[0081]

[0082] wherein, is the capacitance value after voltage control, is the intrinsic capacitance value without voltage control, is a nonlinear index, is an external voltage control signal, is the potential required for the capacitance to reach the maximum value.

[0083] The oscillation frequency after voltage control is obtained as follows:

[0084]

[0085] wherein is the inductance value of the main inductance of the resonant loop, is the oscillation frequency output by the voltage-controlled oscillator.

[0086] The tail inductor, formed by winding the figure-eight metal wire, is connected to the common mode point of the voltage-controlled oscillator through the first and second ports of the tail inductor. Together with the tail current filter capacitor of the voltage-controlled oscillator, it forms a resonant circuit that resonates at the second harmonic of the voltage-controlled oscillator's resonant frequency. This increases the impedance of the common mode point, suppresses the decrease in the quality factor of the inductor-capacitor resonant circuit caused by the negative resistance pair, and achieves resonant filtering.

[0087] Example 2

[0088] Figure 3 Another butterfly-shaped cross tail inductor for voltage-controlled oscillators is shown.

[0089] The main inductor, formed by winding the figure-eight shaped metal wire, includes a first ring 101 of the figure-eight shaped main inductor, a second ring 102 of the figure-eight shaped main inductor, and a main inductor connecting wire 105.

[0090] The figure-eight shaped main inductor first ring 101 and figure-eight shaped main inductor second ring 102 are connected by main inductor connecting line 105. The figure-eight shaped main inductor first ring 101 is set in the second quadrant of the coordinate system with the center as the origin, and the figure-eight shaped main inductor second ring 102 is set in the fourth quadrant of the coordinate system. The main inductor connecting line 105 is located on the horizontal coordinate axis of the coordinate system.

[0091] The main inductor port includes a first main inductor port 103 and a second main inductor port 104; the tail inductor port includes a first tail inductor port 203 and a second tail inductor port 204.

[0092] The first port 103 of the main inductor is located in the second quadrant near the lateral coordinate axis and is connected to the first ring 101 of the figure-eight main inductor, bending towards the inside of the figure-eight main inductor; the second port 104 of the main inductor is located in the fourth quadrant near the lateral coordinate axis and is connected to the second ring 102 of the figure-eight main inductor, bending towards the inside of the figure-eight main inductor.

[0093] The first ring 101 of the figure-eight main inductor, the second ring 102 of the figure-eight main inductor, the first port 103 of the main inductor, the second port 104 of the main inductor, the main inductor connecting wire 105, and the first port 203 and the second port 204 of the tail inductor are located on the top layer of the metal layer. The first ring 201 of the figure-eight tail inductor, the second ring 202 of the figure-eight tail inductor, and the tail inductor connecting wire 205 are located on the second layer of the metal layer.

[0094] The tail inductor, formed by winding the figure-eight metal wire, includes a first ring 201 of the figure-eight tail inductor, a second ring 202 of the figure-eight tail inductor, and a tail inductor connecting wire 205.

[0095] The first ring 201 and the second ring 202 of the figure-eight tail inductor are connected by a tail inductor connecting line 205. The first ring 201 of the figure-eight tail inductor is located in the first quadrant of the coordinate system, and the second ring 202 of the figure-eight tail inductor is located in the third quadrant of the coordinate system. The tail inductor connecting line 205 is located on the longitudinal coordinate axis of the coordinate system.

[0096] The first port 203 of the tail inductor is located in the fourth quadrant near the lateral coordinate axis and bends outward towards the outside of the figure-eight tail inductor; the second port 204 of the tail inductor is located in the second quadrant near the lateral coordinate axis and bends outward towards the outside of the figure-eight tail inductor.

[0097] The interlayer metal via includes a first interlayer metal via 206 and a second interlayer metal via 207. The first interlayer metal via 206 is located in the fourth quadrant of the coordinate system, and the second interlayer metal via 207 is located in the second quadrant of the coordinate system.

[0098] The first metal interlayer via 206 connects the first ring 201 of the figure-eight tail inductor and the first port 203 of the tail inductor, and the second metal interlayer via 207 connects the second ring 202 of the figure-eight tail inductor and the second port 204 of the tail inductor.

[0099] The first ring 101 and the second ring 102 of the figure-eight main inductor are symmetrically distributed about the origin of the coordinate system.

[0100] The first ring 201 and the second ring 202 of the figure-eight tail inductor are symmetrically distributed about the origin of the coordinate system.

[0101] The first port 103 and the second port 104 of the main inductor are symmetrically distributed about the origin of the coordinate system, and the first port 203 and the second port 204 of the tail inductor are symmetrically distributed about the origin of the coordinate system.

[0102] The butterfly-shaped cross-tail inductor can be used for low phase noise and low area requirements of voltage-controlled oscillators, which helps to improve the noise performance of voltage-controlled oscillators.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A butterfly-shaped cross-tail inductor for a voltage-controlled oscillator, characterized in that, The butterfly-shaped cross main and tail inductor includes a main inductor wound with a figure-eight metal wire, a tail inductor wound with a figure-eight metal wire, two metal interlayer vias, two main inductor ports and two tail inductor ports. The main inductor, formed by winding the figure-eight metal wire, includes two main inductor loops and a main inductor connecting line. The two ends of the main inductor connecting line are respectively connected to one end of a main inductor loop, and the other end of each main inductor loop is connected to the main inductor port. The tail inductor, which is made of figure-eight shaped metal wire, includes two tail inductor rings and a tail inductor connecting line. The two ends of the tail inductor connecting line are respectively connected to one end of a tail inductor ring, and the other end of each tail inductor ring is connected to the tail inductor port. The main inductor and the tail inductor wound with the figure-eight metal wire are centrally symmetrical and are arranged in a multi-layer metal layer under the same process. The main inductor, two main inductor ports and two tail inductor ports are arranged in the top layer of the metal layer, and the tail inductor is arranged in the second layer of the metal layer. The interlayer vias are used to connect the tail inductor ring and the tail inductor port of the two metal layers. The main inductor port and the tail inductor port are used for the connection between the inductor and the voltage-controlled oscillator circuit.

2. The butterfly-shaped cross-tail inductor for a voltage-controlled oscillator according to claim 1, characterized in that, The main inductor, formed by winding the figure-eight metal wire, includes a first ring (101) of the figure-eight main inductor, a second ring (102) of the figure-eight main inductor, and a main inductor connecting wire (105). The first loop (101) and the second loop (102) of the figure-eight main inductor are connected by a main inductor connecting line (105). The first loop (101) of the figure-eight main inductor is located in the first quadrant of the coordinate system with the center as the origin, and the second loop (102) of the figure-eight main inductor is located in the third quadrant of the coordinate system. The main inductor connecting line (105) is located on the longitudinal coordinate axis of the coordinate system. The main inductor port includes a first main inductor port (103) and a second main inductor port (104). The first port (103) of the main inductor is located in the fourth quadrant near the lateral coordinate axis and is connected to the first ring (101) of the figure-eight main inductor, bending outwards towards the outside of the figure-eight main inductor; the second port (104) of the main inductor is located in the second quadrant near the lateral coordinate axis and is connected to the second ring (102) of the figure-eight main inductor, bending outwards towards the outside of the figure-eight main inductor.

3. The butterfly-shaped cross-tail inductor for a voltage-controlled oscillator according to claim 2, characterized in that, The tail inductor, which is made of figure-eight metal wire, includes a first ring (201) of figure-eight tail inductor, a second ring (202) of figure-eight tail inductor, and a tail inductor connecting wire (205). The first ring (201) and the second ring (202) of the figure-eight tail inductor are connected by a tail inductor connecting line (205). The first ring (201) of the figure-eight tail inductor is located in the second quadrant of the coordinate system, and the second ring (202) of the figure-eight tail inductor is located in the fourth quadrant of the coordinate system. The tail inductor connecting line (205) is located on the horizontal coordinate axis of the coordinate system. The tail inductor port includes a tail inductor first port (203) and a tail inductor second port (204). The first port (203) of the tail inductor is located in the second quadrant near the longitudinal coordinate axis and bends inward toward the inside of the figure-eight tail inductor; the second port (204) of the tail inductor is located in the fourth quadrant near the longitudinal coordinate axis and bends inward toward the inside of the figure-eight tail inductor.

4. The butterfly-shaped cross-tail inductor for a voltage-controlled oscillator according to claim 3, characterized in that, The first ring (101) of the figure-eight main inductor, the second ring (102) of the figure-eight main inductor, the first port (103) of the main inductor, the second port (104) of the main inductor, the main inductor connecting line (105), the first port (203) and the second port (204) of the tail inductor are located on the top layer of the metal layer; the first ring (201) of the figure-eight tail inductor, the second ring (202) of the figure-eight tail inductor and the tail inductor connecting line (205) are located on the second layer of the metal layer; The interlayer metal via includes a first interlayer metal via (206) and a second interlayer metal via (207), wherein the first interlayer metal via (206) is located in the second quadrant of the coordinate system and the second interlayer metal via (207) is located in the fourth quadrant of the coordinate system. The first metal interlayer via (206) connects the first ring (201) of the figure-eight tail inductor and the first port (203) of the tail inductor, and the second metal interlayer via (207) connects the second ring (202) of the figure-eight tail inductor and the second port (204) of the tail inductor.

5. The butterfly-shaped cross-tail inductor for a voltage-controlled oscillator according to claim 1, characterized in that, The main inductor, formed by winding the figure-eight metal wire, includes a first ring (101) of the figure-eight main inductor, a second ring (102) of the figure-eight main inductor, and a main inductor connecting wire (105). Optionally, the first loop (101) and the second loop (102) of the figure-eight main inductor are connected by a main inductor connecting line (105). The first loop (101) of the figure-eight main inductor is located in the second quadrant of the coordinate system with the center as the origin, and the second loop (102) of the figure-eight main inductor is located in the fourth quadrant of the coordinate system. The main inductor connecting line (105) is located on the horizontal coordinate axis of the coordinate system. The main inductor port includes a first main inductor port (103) and a second main inductor port (104). The first port (103) of the main inductor is located in the second quadrant near the lateral coordinate axis and is connected to the first ring (101) of the figure-eight main inductor, bending towards the inside of the figure-eight main inductor; the second port (104) of the main inductor is located in the fourth quadrant near the lateral coordinate axis and is connected to the second ring (102) of the figure-eight main inductor, bending towards the inside of the figure-eight main inductor.

6. The butterfly-shaped cross-tail inductor for a voltage-controlled oscillator according to claim 5, characterized in that, The tail inductor, which is made of figure-eight metal wire, includes a first ring (201) of figure-eight tail inductor, a second ring (202) of figure-eight tail inductor, and a tail inductor connecting wire (205). Optionally, the first ring (201) and the second ring (202) of the figure-eight tail inductor are connected by a tail inductor connecting line (205). The first ring (201) of the figure-eight tail inductor is located in the first quadrant of the coordinate system, and the second ring (202) of the figure-eight tail inductor is located in the third quadrant of the coordinate system. The tail inductor connecting line (205) is located on the longitudinal coordinate axis of the coordinate system. The tail inductor ports include the tail inductor first port (203) and the tail inductor second port (204). The first port (203) of the tail inductor is located in the fourth quadrant near the lateral coordinate axis and bends outward towards the outside of the figure-eight tail inductor; the second port (204) of the tail inductor is located in the second quadrant near the lateral coordinate axis and bends outward towards the outside of the figure-eight tail inductor.

7. The butterfly-shaped cross-tail inductor for a voltage-controlled oscillator according to claim 6, characterized in that, The first ring (101) of the figure-eight main inductor, the second ring (102) of the figure-eight main inductor, the first port (103) of the main inductor, the second port (104) of the main inductor, the main inductor connecting line (105), the first port (203) and the second port (204) of the tail inductor are located on the top layer of the metal layer; the first ring (201) of the figure-eight tail inductor, the second ring (202) of the figure-eight tail inductor and the tail inductor connecting line (205) are located on the second layer of the metal layer; The interlayer metal via includes a first interlayer metal via (206) and a second interlayer metal via (207), wherein the first interlayer metal via (206) is located in the fourth quadrant of the coordinate system and the second interlayer metal via (207) is located in the second quadrant of the coordinate system; Optionally, the first metal interlayer via (206) connects the first ring (201) of the figure-eight tail inductor and the first port (203) of the tail inductor, and the second metal interlayer via (207) connects the second ring (202) of the figure-eight tail inductor and the second port (204) of the tail inductor.

8. The butterfly-shaped cross-tail inductor for a voltage-controlled oscillator according to any one of claims 3-4 and 6-7, characterized in that, The first ring (101) and the second ring (102) of the figure-eight main inductor are symmetrically distributed about the origin of the coordinate system; the first ring (201) and the second ring (202) of the figure-eight tail inductor are symmetrically distributed about the origin of the coordinate system.

9. The butterfly-shaped cross-tail inductor for a voltage-controlled oscillator according to any one of claims 3-4 and 6-7, characterized in that, The first port (103) and the second port (104) of the main inductor are symmetrically distributed about the origin of the coordinate system, and the first port (203) and the second port (204) of the tail inductor are symmetrically distributed about the origin of the coordinate system.

10. The butterfly-shaped cross-tail inductor for a voltage-controlled oscillator according to any one of claims 1-7, characterized in that, The main inductor, wound with a figure-eight shaped metal wire, is connected to the resonant circuit of any LC voltage-controlled oscillator through the main inductor port to provide the frequency required for resonance. The tail inductor, wound with a figure-eight shaped metal wire, is connected to the common-mode point of the tail current of the voltage-controlled oscillator through the tail inductor port. The frequency generated by the butterfly-shaped crossed main and tail inductors in the resonant circuit is expressed as: in, The resonant frequency of the main inductor in the butterfly-shaped cross-tail inductor is... The inductance value of the main inductor is made of figure-eight shaped metal wire. This refers to the main capacitor value of the voltage-controlled oscillator. The resonant frequency of the tail inductor in the butterfly-shaped cross-type main tail inductor, located at the second harmonic, provides a filtering function. The inductance value of the tail inductor, which is made of figure-eight shaped metal wire. This is the value of the filter capacitor.

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