Multimode resonator, oscillator and chip

Abstract

The present invention discloses a multi-mode resonator, an oscillator and a chip, belonging to the field of wireless communication technology. The multi-mode resonator includes: two switching circuits, the first switching circuit includes ports P1, P2, P3, and P4, and the second switching circuit includes ports P5, P6, P7, and P8; by controlling the working state of the switch, port P1 is connected to port P3 or port P4, and port P5 is connected to port P7 or port P8; the resonant circuit includes inductors L1, L2, L3, and L4, and capacitors C1, C2, C3, and C4; the inductors and capacitors are connected between the two ports, and the inductors are coupled to each other. The present invention can generate four resonant modes by controlling the working state of the switch, and the chip area of the circuit is small; based on the multi-mode resonator, an oscillator with fewer oscillation cores than conventional technologies can be designed, thereby reducing the oscillator power consumption without reducing the tuning range, thereby improving the FOM performance of the oscillator.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a multi-mode resonator, an oscillator and a chip. Background Art

[0002] Modern wireless transmitters and receivers require mixing of oscillating signals for up-conversion and down-conversion. One popular method is to generate oscillating signals using a cross-coupled voltage-controlled oscillator (VCO) with LC resonators. However, due to the need for a wide frequency range, traditional cross-coupled VCOs typically increase the capacitance of the varactors and capacitor arrays in the LC resonators. This reduces the resonator's quality factor (Q), thereby degrading the phase noise of the oscillating signal. To address the trade-off between frequency modulation range and Q, a common approach is to construct a multimode inductor that, combined with the tuning capabilities of the capacitor array and varactor, forms a resonator capable of varying the resonant frequency over a wide range. Oscillators based on this resonator can achieve wide tuning. Furthermore, this structure reduces the variable range of the capacitors and varactors, thereby improving the resonator's Q, enabling the oscillator to maintain a wide tuning range while achieving low phase noise. However, in this structure, N-mode resonators often require N pairs of oscillator cores to function properly, which exponentially increases the oscillator's power consumption and hinders the optimization of the Figure of Merit (FoM) of a multi-core, multimode oscillator. Summary of the Invention

[0003] In order to solve at least one of the technical problems existing in the prior art to a certain extent, an object of the present invention is to provide a multi-mode resonator, an oscillator and a chip.

[0004] The first technical solution adopted by the present invention is:

[0005] A multimode resonator, comprising:

[0006] Two switch circuits, the first switch circuit includes ports P1, P2, P3, and P4, and the second switch circuit includes ports P5, P6, P7, and P8; by controlling the working states of the switches, port P1 is connected to port P3 or port P4, port P5 is connected to port P7 or port P8, and the remaining ports of the same switch circuit are connected;

[0007] A resonant circuit includes inductors L1, L2, L3, and L4, and capacitors C1, C2, C3, and C4; two ends of inductor L1 are connected between port P1 and port P2, two ends of inductor L2 are connected between port P3 and port P4, two ends of inductor L3 are connected between port P5 and port P6, and two ends of inductor L4 are connected between port P7 and port P8; two ends of capacitor C1 are connected between port P1 and port P2, two ends of capacitor C2 are connected between port P3 and port P4, two ends of capacitor C3 are connected between port P1 and port P3, and two ends of capacitor C4 are connected between port P2 and port P4; wherein, inductor L1 and inductor L2 are coupled to each other, inductor L1 and inductor L3 are coupled to each other, inductor L2 and inductor L4 are coupled to each other, and inductor L3 and inductor L4 are coupled to each other.

[0008] Furthermore, the first switching circuit and the second switching circuit have the same structure; the switching circuit includes two switch groups, each switch group includes two switches, and the working states of the two switches are the same, that is, the switches of the same switch group are turned on or off at the same time; each port in the switching circuit is connected to two switch groups.

[0009] Furthermore, the switch is implemented by a transistor; the first switch circuit includes a first transistor, a second transistor, a third transistor and a fourth transistor;

[0010] The drain of the first transistor is connected to the port P1, the source is connected to the port P3, and the gate is connected to the first control signal;

[0011] The drain of the second transistor is connected to the port P2, the source is connected to the port P4, and the gate is connected to the first control signal;

[0012] The drain of the third transistor is connected to the port P2, the source is connected to the port P3, and the gate is connected to the second control signal;

[0013] The fourth transistor has a drain connected to the port P1 , a source connected to the port P4 , and a gate connected to the second control signal.

[0014] Furthermore, the inductor L1 and the inductor L2 are implemented using a T-shaped equivalent structure.

[0015] Furthermore, the capacitors C1 and C2 are variable capacitors.

[0016] Furthermore, the inductors L1, L2, L3, and L4 are all implemented using metal wires;

[0017] The metal wires corresponding to the inductors L1, L2, L3, and L4 are all deployed on the same plane; or,

[0018] The metal wires corresponding to the inductors L1 and L2 are disposed on one plane, and the metal wires corresponding to the inductors L3 and L4 are disposed on another plane.

[0019] The second technical solution adopted by the present invention is:

[0020] A multi-mode multi-core oscillator, comprising:

[0021] A multimode resonator is implemented using the multimode resonator described above;

[0022] Two oscillation core circuits, two ends of one oscillation core circuit are respectively connected to port P1 and port P2 of the first switch circuit, and two ends of the other oscillation core circuit are respectively connected to port P3 and port P4 of the first switch circuit.

[0023] Furthermore, the oscillation core circuit is composed of NMOS transistors; the center taps of the inductor L1 and the inductor L2 are connected to the power supply voltage.

[0024] Furthermore, the oscillation core circuit is composed of PMOS transistors; the center taps of the inductor L1 and the inductor L2 are grounded.

[0025] Furthermore, the multi-mode multi-core oscillator includes four operating modes, corresponding to four resonant frequencies respectively;

[0026] In working mode 1, P1 and P4 are connected, P2 and P3 are connected, P5 and P8 are connected, and P6 and P7 are connected;

[0027] In working mode 2, P1 and P3 are connected, P2 and P4 are connected, P5 and P8 are connected, and P6 and P7 are connected;

[0028] In working mode 3, P1 and P3 are connected, P2 and P4 are connected, P5 and P7 are connected, and P6 and P8 are connected;

[0029] In working mode 4, P1 and P4 are connected, P2 and P3 are connected, P5 and P7 are connected, and P6 and P8 are connected.

[0030] The third technical solution adopted by the present invention is:

[0031] A chip, characterized by comprising a multi-mode resonator as described above, or comprising a multi-mode multi-core oscillator as described above.

[0032] The beneficial effects of the present invention are as follows: the multi-mode resonator provided by the present invention can generate four resonance modes by controlling the working state of the switch, and the chip area of the circuit is small; based on the multi-mode resonator, an oscillator with a smaller oscillation core than conventional technology can be designed, thereby reducing the oscillator power consumption without reducing the tuning range, thereby improving the FOM performance of the oscillator. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following introduction is made to the drawings of the embodiments of the present invention or the related technical solutions in the prior art. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 This is a schematic diagram of a multi-mode resonator provided by an embodiment of the present invention.

[0035] Figure 2 This is a block diagram of a multi-mode multi-core oscillator provided by an embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of the oscillation core principle formed by the NMOS tube in an embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of the oscillation core principle formed by the PMOS tube in an embodiment of the present invention.

[0038] Figure 5 Schematic diagram of the electromagnetic field distribution of the resonator inductance in mode 1 in an embodiment of the present invention.

[0039] Figure 6 Schematic diagram of the electromagnetic field distribution of the resonator inductance in mode 2 in an embodiment of the present invention.

[0040] Figure 7 Schematic diagram of the electromagnetic field distribution of the resonator inductance in mode 3 in an embodiment of the present invention.

[0041] Figure 8 Schematic diagram of the electromagnetic field distribution of the resonator inductance in mode 4 in an embodiment of the present invention.

[0042] Figure 9 Schematic diagram of the input impedance of the resonator in four modes according to an embodiment of the present invention.

[0043] Figure 10 Schematic diagram of the change in resonant frequency of four mode resonators under different capacitances C1 (C2) in an embodiment of the present invention.

[0044] Figure 11 Schematic diagram of an implementation example of capacitor C1 (C2) in an embodiment of the present invention.

[0045] Figure 12 This is a schematic diagram of an implementation example of the switch circuit in an embodiment of the present invention.

[0046] Figure 13This is another implementation layout of the resonator inductor network in an embodiment of the present invention.

[0047] Figure 14 This is another equivalent principle diagram of the multi-mode resonator in the embodiment of the present invention.

[0048] Figure 15 This is another implementation layout of the multi-mode resonator inductor network after T-type equivalent in the embodiment of the present invention. DETAILED DESCRIPTION

[0049] The embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention and are not to be construed as limiting the present invention. The step numbers in the following embodiments are provided for ease of explanation only and do not limit the order of the steps. The order of execution of the steps in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In response to the existing technical problems, the present invention proposes a multi-mode resonator that can generate four resonance modes. Based on the multi-mode resonator, an oscillator with a smaller oscillation core than conventional technology can be designed, thereby reducing the oscillator power consumption without reducing the tuning range, thereby improving the FOM performance of the oscillator.

[0054] Example 1

[0055] like Figure 1 As shown, this embodiment provides a multi-mode resonator, including:

[0056] Two switch circuits, the first switch circuit includes ports P1, P2, P3, and P4, and the second switch circuit includes ports P5, P6, P7, and P8; by controlling the working states of the switches, port P1 is connected to port P3 or port P4, and port P5 is connected to port P7 or port P8;

[0057] A resonant circuit includes inductors L1, L2, L3, and L4, and capacitors C1, C2, C3, and C4; two ends of inductor L1 are connected between port P1 and port P2, two ends of inductor L2 are connected between port P3 and port P4, two ends of inductor L3 are connected between port P5 and port P6, and two ends of inductor L4 are connected between port P7 and port P8; two ends of capacitor C1 are connected between port P1 and port P2, two ends of capacitor C2 are connected between port P3 and port P4, two ends of capacitor C3 are connected between port P1 and port P3, and two ends of capacitor C4 are connected between port P2 and port P4; wherein, inductor L1 and inductor L2 are coupled to each other, inductor L1 and inductor L3 are coupled to each other, inductor L2 and inductor L4 are coupled to each other, and inductor L3 and inductor L4 are coupled to each other.

[0058] Specifically, each switch circuit includes two switch groups, each switch group includes two switches, that is, each switch circuit is composed of four switches, and the switches in the same switch group are turned on or off at the same time. Figure 1 The four switch groups are labeled S1, S2, S3, and S4. When S1 (S3) is on and S2 (S4) is off, P1 (P5) connects to P3 (P7), and P2 (P6) connects to P4 (P8). When S1 (S3) is off and S2 (S4) is on, P1 (P5) connects to P4 (P8), and P2 (P6) connects to P3 (P7). Furthermore, P1 (P3, P5, P7) and P2 (P4, P6, P8) are differential signals.

[0059] In this embodiment, the resonant circuit is composed of four inductors L1-L4 and four capacitors C1-C4. L1 and L2 are directly coupled to each other, with a corresponding coupling coefficient of k1. L1 and L3, and L2 and L4 are mutually coupled, with a corresponding coupling coefficient of k2. L3 and L4 are mutually coupled, with a corresponding coupling coefficient of k3. The resonator's ports P1-P8 are connected to the ports P1-P8 of the two switching circuits, respectively, forming a multi-mode resonator circuit.

[0060] As an optional implementation, see Figure 12The switch is implemented by a transistor. Taking the first switch circuit as an example, the first switch circuit includes a first transistor, a second transistor, a third transistor and a fourth transistor.

[0061] The drain of the first transistor is connected to the port P1, the source is connected to the port P3, and the gate is connected to the first control signal;

[0062] The drain of the second transistor is connected to the port P2, the source is connected to the port P4, and the gate is connected to the first control signal;

[0063] The drain of the third transistor is connected to the port P2, the source is connected to the port P3, and the gate is connected to the second control signal;

[0064] The fourth transistor has a drain connected to the port P1 , a source connected to the port P4 , and a gate connected to the second control signal.

[0065] As an optional implementation, see Figure 5 Inductors L1, L2, L3, and L4 are all implemented using metal wires, and the metal wires corresponding to inductors L1, L2, L3, and L4 are all deployed on the same plane. Inductor L3 is nested inside inductor L1, and inductor L4 is nested inside inductor L2.

[0066] See also Figure 2 Based on the above multi-mode resonator, by adding an oscillation core circuit to its P1P2 (P3P4) port and connecting the middle taps of inductor L1 and inductor L2 to the corresponding power supply or ground, a multi-mode multi-core oscillator circuit can be constructed. Specifically, when the added oscillation core circuit is composed of NMOS transistors, the corresponding L1 and L2 taps need to be connected to the power supply. The specific oscillation core circuit is as follows: Figure 3 When the added oscillator core circuit is composed of PMOS tubes, the corresponding L1 and L2 taps need to be grounded. The specific oscillator core circuit is as follows Figure 4 The oscillator core circuit primarily consists of two cross-coupled MOS transistors and a current source. The cross-coupled MOS transistors provide negative resistance to the resonator circuit, maintaining the oscillator's normal operation. The current source controls the oscillator circuit's power consumption and optimizes the oscillator's phase noise by adjusting the current.

[0067] By controlling the on and off states of switches S1-S4, the resonator can achieve different equivalent resonant frequencies. The following analysis shows the equivalent resonant frequencies for various operating modes, assuming L1 = L2 = La, L3 = L4 = Lb, C1 = C2 = Cr, and C3 = C4 = Cc. "1" indicates that switches S1-S4 are on, and "0" indicates that they are off.

[0068] 1) In working mode 1, S1=0, S2=1, S3=0, S4=1, an example of the corresponding inductor layout is Figure 5 As shown. When S1 = 0 and S2 = 1, P1 (P2) and P4 (P3) are in phase, while P1 (P3) and P2 (P4) are in anti-phase. Assuming the oscillator core output drives current from P2 into L1 and out of P1, a clockwise current will flow in L1's inductor. Simultaneously, this changing current will generate a magnetic field directed inward from the paper. This changing magnetic field will induce a counterclockwise current in L3. Similarly, L2, driven by the oscillator core, will also generate a clockwise current. This changing current will generate a magnetic field directed inward from the paper, which will induce a counterclockwise current in L4. Since S3 = 0 and S4 = 1, P5 (P6) and P8 (P7) are short-circuited, resulting in equal and opposite induced currents in L3 and L4, thus canceling each other out. Since P1 (P2) and P3 (P4) are in opposite phases, a virtual ground point is formed between C3 (C4), and C3 (C4) can be equivalent to two capacitors with a capacitance of 2Cc. Therefore, the corresponding expression for the resonant frequency of operating mode 1 is as follows:

[0069]

[0070] 2) In working mode 2, S1=1, S2=0, S3=0, S4=1, an example of the corresponding inductor layout is Figure 6 As shown. When S1 = 1 and S2 = 0, P1 (P2) and P3 (P4) are in phase, while P1 (P3) and P2 (P4) are in anti-phase. Similarly, assuming the oscillator core output drives current from P2 into L1 and out of P1, a clockwise current will form in the inductor of L1. Simultaneously, this changing current will generate a magnetic field directed inward from the paper. This changing magnetic field will induce a counterclockwise current in L3. Driven by the oscillator core, a counterclockwise current will also form in L2. This changing current will generate a magnetic field directed outward from the paper, which will induce a clockwise current in L4. Since S3 = 0 and S4 = 1, P5 (P6) and P8 (P7) are short-circuited. At this point, the currents in L3 and L4 will form a closed loop, forming a figure-8 current pattern. Since P1 (P2) and P3 (P4) are in anti-phase, a virtual ground point is formed between C3 (C4), and C3 (C4) can be equivalent to two capacitors with a capacitance of 2Cc. In this case, the resonant frequency expression corresponding to operating mode 2 is as follows:

[0071]

[0072] Where M = k2*(L a *L b ) 1 / 2is the mutual inductance between inductors L1 (L2) and L3 (L4).

[0073] 3) In working mode 3, S1=1, S2=0, S3=1, S4=0, an example of the corresponding inductor layout is Figure 7 As shown. When S1 = 1 and S2 = 0, P1 (P2) and P3 (P4) are in phase, while P1 (P3) and P2 (P4) are in antiphase. Similarly, assuming the oscillator core output drives current from P2 into L1 and out of P1, a clockwise current will flow in L1's inductor. Simultaneously, this changing current generates a magnetic field directed inward from the paper. This changing magnetic field will induce a counterclockwise current in L3. Driven by the oscillator core, a counterclockwise current will also flow in L2. This changing current generates a magnetic field directed outward from the paper, which in turn induces a clockwise current in L4. Since S3 = 0 and S4 = 1, P5 (P6) and P7 (P8) are short-circuited, causing the currents in L3 and L4 to cancel each other. Furthermore, since P1 (P2) and P3 (P4) are in phase, the voltages across capacitors C3 (C4) are equal, rendering them ineffective in the resonator. Therefore, the resonant frequency expression corresponding to operating mode 3 is as follows:

[0074]

[0075] 4) In working mode 4, S1=0, S2=1, S3=1, S4=0, an example of the corresponding inductor layout is Figure 8 As shown. When S1 = 0 and S2 = 1, P1 (P2) and P4 (P3) are in phase, while P1 (P3) and P2 (P4) are in antiphase. Similarly, assuming the oscillator core output drives current from P2 into L1 and out of P1, a clockwise current will flow in L1's inductor. Simultaneously, this changing current generates a magnetic field directed inward from the paper. This changing magnetic field will induce a counterclockwise current in L3. Driven by the oscillator core, a clockwise current will also flow in L2. This changing current generates a magnetic field directed inward from the paper, which in turn induces a counterclockwise current in L4. Since S3 = 1 and S4 = 0, P5 (P6) and P7 (P8) are short-circuited, allowing the induced current to form a loop in L3 and L4. Furthermore, since P1 (P2) and P3 (P4) are in phase, the voltages across capacitors C3 (C4) are the same, rendering them ineffective in the resonator. Therefore, the resonant frequency expression corresponding to operating mode 4 is as follows:

[0076]

[0077] Finally, the resonator input impedance corresponding to these four working modes is as follows: Figure 9 shown.

[0078] See also Figure 11 In some embodiments, capacitors C1 and C2 are variable capacitors. By controlling the voltage VC to change the value of C1 (C2), the oscillator composed of the resonator can have a wider operating frequency range. The resonant frequency changes of the four modes under different capacitances C1 (C2) are as follows: Figure 10 shown.

[0079] In summary, this embodiment provides a multi-mode resonator circuit, which has the following beneficial effects: (1) The circuit can form four resonant modes with a relatively small chip area. (2) The resonator proposed in this embodiment is formed by coupling multiple inductors and capacitors with each other. The inductors can be implemented by means of same-layer coupling, stacked-layer coupling, etc., further improving the flexibility of the design. (3) The oscillator based on this resonator design can achieve more operating modes with fewer oscillation cores, saving power while not affecting the tuning range.

[0080] Example 2

[0081] like Figure 14 As shown, the main difference between the multi-mode resonator provided in this embodiment and the multi-mode resonator of embodiment 1 is in the resonant circuit. In this embodiment, L1 and L2 in the resonant circuit can be directly converted into another form using a T-type equivalent. Specifically, the resonant circuit includes inductors L1, L2, L3, L4, L5, L6, and L7. After the inductor L1 and the inductor L3 are connected in series, they are connected between ports P1 and P3. The series node of inductor L1 and inductor L3 is marked as point A; after the inductor L2 and the inductor L4 are connected in series, they are connected between ports P2 and P4. The series node of inductor L2 and inductor L4 is marked as point B; the two ends of inductor L5 are connected between points A and B. The two ends of inductor L6 are connected between ports P5 and P6, and the two ends of inductor L77 are connected between ports P7 and P8. Inductor L1 and inductor L3 are coupled to each other, and the corresponding coupling coefficient is k1; inductor L2 and inductor L4 are coupled to each other, and the corresponding coupling coefficient is k1; inductor L5 is coupled to L1, L2, L3, and L4 respectively, and the corresponding coupling coefficient is k4. Inductor L1 is coupled to L6, and L3 is coupled to L6, and the corresponding coupling coefficient is k2; inductor L2 is coupled to L7, and L4 is coupled to L7, and the corresponding coupling coefficient is k2. In this structure, the equivalent inductor network directly adds new coupling, and the corresponding layout is implemented as follows: Figure 15 shown.

[0082] The multi-mode resonator of this embodiment has the same functions and beneficial effects as the multi-mode resonator of embodiment 1.

[0083] Example 3

[0084] like Figure 13As shown, the multimode resonator of this embodiment differs from the multimode resonator of Example 1 in the layout of the inductors. In this embodiment, inductors L1, L2, L3, and L4 are arranged in an upper and lower layer arrangement. Specifically, inductors L1 and L2 are deployed on the first metal layer, and inductors L3 and L4 are deployed on the second metal layer. The multimode resonator of this embodiment has the same functions and benefits as the multimode resonator of Example 1.

[0085] In the above description of this specification, reference to the terms "one embodiment / example," "another embodiment / example," or "certain embodiments / examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0086] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

[0087] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A multimode resonator, characterized in that: include: Two switch circuits, the first switch circuit includes ports P1, P2, P3, and P4, and the second switch circuit includes ports P5, P6, P7, and P8; by controlling the working states of the switches, port P1 is connected to port P3 or port P4, and port P5 is connected to port P7 or port P8; A resonant circuit includes inductors L1, L2, L3, and L4, and capacitors C1, C2, C3, and C4; two ends of inductor L1 are connected between port P1 and port P2, two ends of inductor L2 are connected between port P3 and port P4, two ends of inductor L3 are connected between port P5 and port P6, and two ends of inductor L4 are connected between port P7 and port P8; two ends of capacitor C1 are connected between port P1 and port P2, two ends of capacitor C2 are connected between port P3 and port P4, two ends of capacitor C3 are connected between port P1 and port P3, and two ends of capacitor C4 are connected between port P2 and port P4; wherein, inductor L1 and inductor L2 are coupled to each other, inductor L1 and inductor L3 are coupled to each other, inductor L2 and inductor L4 are coupled to each other, and inductor L3 and inductor L4 are coupled to each other; The first switch circuit includes a first transistor, a second transistor, a third transistor and a fourth transistor; The drain of the first transistor is connected to the port P1, the source is connected to the port P3, and the gate is connected to the first control signal; The drain of the second transistor is connected to the port P2, the source is connected to the port P4, and the gate is connected to the first control signal; The drain of the third transistor is connected to the port P2, the source is connected to the port P3, and the gate is connected to the second control signal; The drain of the fourth transistor is connected to the port P1, the source is connected to the port P4, and the gate is connected to the second control signal; The capacitors C1 and C2 are variable capacitors; The inductors L1, L2, L3, and L4 are all implemented using metal wires; The metal wires corresponding to the inductors L1, L2, L3, and L4 are all deployed on the same plane; or, The metal wires corresponding to the inductors L1 and L2 are disposed on one plane, and the metal wires corresponding to the inductors L3 and L4 are disposed on another plane.

2. A multimode resonator according to claim 1, characterized in that: The first switching circuit and the second switching circuit have the same structure; the switching circuit includes two switch groups, each switch group includes two switches, and the working states of the two switches are the same, that is, the switches of the same switch group are turned on or off at the same time; each port in the switching circuit is connected to two switch groups.

3. The multimode resonator according to claim 1, characterized in that: The inductor L1 and the inductor L2 are implemented by adopting a T-type equivalent structure.

4. A multi-mode multi-core oscillator, characterized in that: include: A multimode resonator, implemented using the multimode resonator according to any one of claims 1 to 3; Two oscillation core circuits, two ends of one oscillation core circuit are respectively connected to port P1 and port P2 of the first switch circuit, and two ends of the other oscillation core circuit are respectively connected to port P3 and port P4 of the first switch circuit.

5. The multi-mode multi-core oscillator according to claim 4, characterized in that: The oscillation core circuit is composed of NMOS transistors; the center taps of the inductor L1 and the inductor L2 are connected to the power supply voltage.

6. The multi-mode multi-core oscillator according to claim 4, characterized in that: The oscillation core circuit is composed of PMOS transistors; the center taps of the inductor L1 and the inductor L2 are grounded.

7. The multi-mode multi-core oscillator according to claim 4, characterized in that: The multi-mode multi-core oscillator includes four operating modes, corresponding to four resonant frequencies respectively; In working mode 1, P1 and P4 are connected, P2 and P3 are connected, P5 and P8 are connected, and P6 and P7 are connected; In working mode 2, P1 and P3 are connected, P2 and P4 are connected, P5 and P8 are connected, and P6 and P7 are connected; In working mode 3, P1 and P3 are connected, P2 and P4 are connected, P5 and P7 are connected, and P6 and P8 are connected; In working mode 4, P1 and P4 are connected, P2 and P3 are connected, P5 and P7 are connected, and P6 and P8 are connected.

8. A chip, characterized in that: It comprises a multi-mode resonator as described in any one of claims 1 to 5, or comprises a multi-mode multi-core oscillator as described in any one of claims 4 to 7.

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