Multi-mode resonator, oscillator and chip

Abstract

The invention discloses a multimode resonator, an oscillator and a chip, and belongs to the technical field of wireless communication. The multimode resonator comprises two switching circuits, the first switching circuit comprises ports P1, P2, P3 and P4, and the second switching circuit comprises ports P5, P6, P7 and P8; by controlling the working state of the switch, the port P1 is connected with the port P3 or the port P4, and the port P5 is connected with the port P7 or the port P8; the resonance circuit comprises an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4; the inductors and the capacitors are connected between the two ports, and the inductors are mutually coupled. By controlling the working state of the switch, four resonant modes can be generated, and the chip area of the circuit is small; based on the multi-mode resonator, an oscillator of which the oscillation core is reduced compared with the conventional technology can be designed, so that the power consumption of the oscillator is reduced without reducing the tuning range, and the FOM performance of the oscillator is improved.

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 receivers and transmitters require oscillation signals for up-conversion and down-conversion mixing. One of the most popular methods is to use a cross-coupled voltage-controlled oscillator of an LC resonator to generate an oscillation signal. However, due to the need to be applicable to a wider frequency range, the traditional cross-coupled voltage-controlled oscillator usually increases the capacitance of the varactor and the capacitor array in the LC resonator, which will cause the quality factor Q of the resonator to decrease, thereby deteriorating the phase noise of the oscillation signal. In order to solve the contradiction between the frequency modulation range and the Q value, a common method is to construct a multi-mode inductor, cooperate with the tuning function of the capacitor array and the varactor, and form a resonator that can change the resonant frequency over a wide range. The oscillator based on this resonator can achieve wide-range tuning. In addition, in this structure, the variable range of the capacitor and the varactor can be reduced, thereby increasing the Q value of the resonator, so that the oscillator can have a wide tuning range while achieving lower phase noise. However, in this structure, the N-mode resonator often needs to cooperate with N pairs of oscillator cores to work properly, which will cause the power consumption of the oscillator to increase exponentially, and thus it is impossible to optimize the quality factor (Figure of Merit, FoM) of the multi-core multi-mode 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 state of the switch, 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] The resonant circuit includes inductors L1, L2, L3, L4, and capacitors C1, C2, C3, C4; two ends of the inductor L1 are connected between port P1 and port P2, two ends of the inductor L2 are connected between port P3 and port P4, two ends of the inductor L3 are connected between port P5 and port P6, and two ends of the inductor L4 are connected between port P7 and port P8; two ends of the capacitor C1 are connected between port P1 and port P2, two ends of the capacitor C2 are connected between port P3 and port P4, two ends of the capacitor C3 are connected between port P1 and port P3, and two ends of the capacitor C4 are connected between port P2 and port P4; wherein, the inductor L1 and the inductor L2 are coupled to each other, the inductor L1 and the inductor L3 are coupled to each other, the inductor L2 and the inductor L4 are coupled to each other, and the inductor L3 and the inductor L4 are coupled to each other.

[0008] Furthermore, the first switch circuit and the second switch circuit have the same structure; the switch 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 switch circuit is connected to the 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 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.

[0014] Furthermore, the inductor L1 and the inductor L2 are implemented by adopting a T-type 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 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 multi-mode resonator, implemented using the multi-mode resonator as 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 a PMOS transistor; 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 is connected to P4, P2 is connected to P3, P5 is connected to P8, and P6 is connected to P7;

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

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

[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 in that it includes a multi-mode resonator as described above, or includes 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 power consumption of the oscillator 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 embodiments of the present invention or the drawings of related technical solutions in the prior art are introduced below. 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 creative work.

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

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

[0036] Figure 3 It is a schematic diagram of the oscillation core composed of the NMOS tube in the embodiment of the present invention.

[0037] Figure 4 It is a schematic diagram of the oscillation core formed by the PMOS tube in the 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] Fig. 9 Schematic diagram of the input impedance of the resonator in four modes according to an embodiment of the present invention.

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

[0044] Fig.11 It is a schematic diagram of an implementation example of the C1 (C2) capacitor in the embodiment of the present invention.

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

[0046] Fig.13It is another implementation layout of the resonator inductor network in the embodiment of the present invention.

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

[0048] Fig.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, and 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 only used to explain the present invention, and are not to be construed as limitations of the present invention. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiment 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., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0051] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0052] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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 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;

[0057] The resonant circuit includes inductors L1, L2, L3, L4, and capacitors C1, C2, C3, C4; two ends of the inductor L1 are connected between port P1 and port P2, two ends of the inductor L2 are connected between port P3 and port P4, two ends of the inductor L3 are connected between port P5 and port P6, and two ends of the inductor L4 are connected between port P7 and port P8; two ends of the capacitor C1 are connected between port P1 and port P2, two ends of the capacitor C2 are connected between port P3 and port P4, two ends of the capacitor C3 are connected between port P1 and port P3, and two ends of the capacitor C4 are connected between port P2 and port P4; wherein, the inductor L1 and the inductor L2 are coupled to each other, the inductor L1 and the inductor L3 are coupled to each other, the inductor L2 and the inductor L4 are coupled to each other, and the inductor L3 and the 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 of the same switch group are turned on or off at the same time. Figure 1 , the four switch groups are denoted as S1, S2, S3, and S4. When S1 (S3) is on and S2 (S4) is off, P1 (P5) is connected to P3 (P7), and P2 (P6) is connected to P4 (P8). When S1 (S3) is off and S2 (S4) is on, P1 (P5) is connected to P4 (P8), and P2 (P6) is connected to P3 (P7). At the same time, 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, and L1 and L2 are directly coupled to each other, and the corresponding coupling coefficient is k1. L1 and L3, L2 and L4 are coupled to each other, and the corresponding coupling coefficient is k2. L3 and L4 are coupled to each other, and the corresponding coupling coefficient is k3. The P1-P8 ports derived from the resonator are respectively connected to the P1-P8 of the two sets of switch circuits, and together form a multi-mode resonator circuit.

[0060] As an optional implementation, see Fig.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 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.

[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 sleeved inside inductor L1, and inductor L4 is sleeved inside inductor L2.

[0066] See also Figure 2 Based on the above multi-mode resonator, an oscillation core circuit is added to its P1P2 (P3P4) port, and the middle taps of inductor L1 and inductor L2 are connected to the corresponding power supply or ground, so as to form a multi-mode multi-core oscillator circuit. Specifically, when the added oscillation core circuit is composed of NMOS tubes, 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 a PMOS tube, the corresponding L1 and L2 taps need to be grounded. The specific oscillator core circuit is as follows Figure 4 As shown in the figure, the oscillation core circuit is mainly composed of two corresponding MOS tubes cross-coupled and a current source. The cross-coupled MOS tube provides negative resistance for the resonator circuit to maintain the normal operation of the oscillator. The current source can control the power consumption of the oscillator circuit and optimize the phase noise of the oscillator by adjusting the current size.

[0067] By controlling the on and off of the switch group S1-S4, the resonator can be made equivalent to different resonant frequencies. The following analyzes the equivalent resonant frequencies of various working modes, assuming that L1=L2=La, L3=L4=Lb, C1=C2=Cr, C3=C4=Cc, "1" indicates that the switch group S1-S4 is on, and "0" indicates that the switch group S1-S4 is off.

[0068] 1) In working mode 1, S1 = 0, S2 = 1, S3 = 0, S4 = 1, and an example of the corresponding inductor layout is Figure 5 As shown. When S1=0, S2=1, P1(P2) and P4(P3) are in phase, and P1(P3) and P2(P4) are in anti-phase. Assuming that the oscillation core outputs a driving current that flows from P2 into L1 and out of P1, a clockwise current will be formed in the L1 inductor, and the changing current will generate a magnetic field that is directed inward toward the paper. At this time, the changing magnetic field will cause L3 to generate an induced current in the counterclockwise direction. Similarly, for L2, a clockwise current will be formed under the drive of the oscillation core, and the changing current will generate a magnetic field that is directed inward toward the paper, and the magnetic field will cause L4 to form an induced current in the counterclockwise direction. Since S3=0, S4=1, P5(P6) and P8(P7) are short-circuited, so that the induced currents of L3 and L4 are equal in magnitude and opposite in direction, thereby canceling each other out. Since P1 (P2) and P3 (P4) are in anti-phase, a virtual point is formed between C3 (C4), and C3 (C4) can be equivalent to two capacitors with a capacitance of 2Cc. Therefore, the corresponding expression of the resonant frequency of working mode 1 is as follows:

[0069]

[0070] 2) In working mode 2, S1=1, S2=0, S3=0, S4=1, and an example of the corresponding inductor layout is Figure 6 As shown. When S1=1, S2=0, P1(P2) and P3(P4) are in phase, and P1(P3) and P2(P4) are in anti-phase. Similarly, assuming that the oscillation core outputs a driving current that flows from P2 into L1 and out of P1, a clockwise current will be formed in the L1 inductor, and the changing current will generate a magnetic field, with the direction facing inward from the paper. At this time, the changing magnetic field will cause L3 to generate an induced current in the counterclockwise direction. In L2, a counterclockwise current will also be formed under the drive of the oscillation core, and the changing current will generate a magnetic field facing outward from the paper, and the magnetic field will cause L4 to form an induced current in the clockwise direction. Since S3=0, S4=1, P5(P6) and P8(P7) are short-circuited. At this time, the currents in L3 and L4 will form a closed loop, forming an 8-shaped current direction. Since P1 (P2) and P3 (P4) are in anti-phase, a virtual point is formed between C3 (C4), and C3 (C4) can be equivalent to two capacitors with a capacitance of 2Cc. At this time, the corresponding resonant frequency expression of working 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, and an example of the corresponding inductor layout is Figure 7 As shown. When S1=1, S2=0, P1(P2) and P3(P4) are in phase, and P1(P3) and P2(P4) are in anti-phase. Similarly, assuming that the oscillation core outputs a driving current that flows from P2 into L1 and out of P1, a clockwise current will be formed in the L1 inductor, and the changing current will generate a magnetic field, which is directed inward from the paper. At this time, the changing magnetic field will cause L3 to generate an induced current in the counterclockwise direction. In L2, a counterclockwise current will also be formed under the drive of the oscillation core, and the changing current will generate a magnetic field outward from the paper, and the magnetic field will cause L4 to form an induced current in the clockwise direction. Since S3=0, S4=1, P5(P6) and P7(P8) are short-circuited, and at this time, the currents in L3 and L4 will cancel each other out. In addition, since P1(P2) and P3(P4) are in phase, the voltages across the capacitor C3(C4) are the same, and they cannot function in the resonator. Therefore, the resonant frequency expression corresponding to working mode 3 is as follows:

[0074]

[0075] 4) In working mode 4, S1 = 0, S2 = 1, S3 = 1, S4 = 0, and an example of the corresponding inductor layout is as follows: Figure 8 As shown. When S1=0, S2=1, P1(P2) and P4(P3) are in phase, and P1(P3) and P2(P4) are in anti-phase. Similarly, assuming that the oscillation core outputs a driving current that flows from P2 into L1 and out of P1, a clockwise current will be formed in the L1 inductor, and the changing current will generate a magnetic field that is directed inward from the paper. At this time, the changing magnetic field will cause L3 to generate an induced current in the counterclockwise direction. In L2, a clockwise current will also be formed under the drive of the oscillation core, and the changing current will generate a magnetic field that is directed inward from the paper. The magnetic field causes L4 to form an induced current in the counterclockwise direction. Since S3=1, S4=0, P5(P6) and P7(P8) are short-circuited. At this time, the induced current can form a loop in L3 and L4. In addition, since P1(P2) and P3(P4) are in phase, the voltages across the capacitor C3(C4) are the same, and they cannot function in the resonator. Therefore, the resonant frequency expression corresponding to working mode 4 is as follows:

[0076]

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

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

[0079] In summary, this embodiment provides a multi-mode resonator circuit, and the beneficial effects of the circuit are as follows: (1) The circuit can form four resonance modes with a smaller chip area. (2) The resonator proposed in this embodiment is formed by a plurality of inductors and capacitors coupled to each other, and the inductors can be implemented by same-layer coupling, stacked-layer coupling, etc., further improving the flexibility of the design. (3) The oscillator based on the resonator design can realize more working modes with fewer oscillation cores, saving power consumption without affecting the tuning range.

[0080] Example 2

[0081] like Fig.14 As shown, the main difference between the multi-mode resonator provided in this embodiment and the multi-mode resonator in 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 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 port P1 and port P3, and the series node of inductor L1 and inductor L3 is recorded as point A; after the inductor L2 and the inductor L4 are connected in series, they are connected between port P2 and port P4, and the series node of inductor L2 and inductor L4 is recorded as point B; the two ends of inductor L5 are connected between point A and point B. The two ends of inductor L6 are connected between port P5 and port P6, and the two ends of inductor L77 are connected between port P7 and port 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: Fig.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 Fig.13As shown, the difference between the multi-mode resonator of this embodiment and the multi-mode resonator of embodiment 1 lies in the layout of the inductors in the layout diagram. In this embodiment, the inductors L1, L2, L3, and L4 are arranged in an upper and lower layer manner. Specifically, the inductors L1 and L2 are deployed in the first metal layer, and the inductors L3 and L4 are deployed in the second metal layer. The multi-mode resonator of this embodiment has the same functions and beneficial effects as the multi-mode resonator of embodiment 1.

[0085] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. 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 one or more embodiments or examples in a suitable manner.

[0086] Although 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 present invention, and that the scope of the present 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 may 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 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, L4, and capacitors C1, C2, C3, C4; two ends of the inductor L1 are connected between port P1 and port P2, two ends of the inductor L2 are connected between port P3 and port P4, two ends of the inductor L3 are connected between port P5 and port P6, and two ends of the inductor L4 are connected between port P7 and port P8; two ends of the capacitor C1 are connected between port P1 and port P2, two ends of the capacitor C2 are connected between port P3 and port P4, two ends of the capacitor C3 are connected between port P1 and port P3, and two ends of the capacitor C4 are connected between port P2 and port P4; wherein, the inductor L1 and the inductor L2 are coupled to each other, the inductor L1 and the inductor L3 are coupled to each other, the inductor L2 and the inductor L4 are coupled to each other, and the inductor L3 and the inductor L4 are coupled to each other.

2. A multimode resonator according to claim 1, characterized in that: The first switch circuit and the second switch circuit have the same structure; the switch 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 switch circuit is connected to the two switch groups.

3. A multimode resonator according to claim 2, characterized in that: 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; 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.

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

5. A multimode resonator according to claim 1, characterized in that: 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 L3 and L4 are disposed on another plane.

6. A multi-mode multi-core oscillator, characterized in that: include: A multimode resonator, implemented by using the multimode resonator according to any one of claims 1 to 5; 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.

7. The multi-mode multi-core oscillator according to claim 6, 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.

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

9. The multi-mode multi-core oscillator according to claim 6, characterized in that: The multi-mode multi-core oscillator includes four working modes, corresponding to four resonant frequencies respectively; In working mode 1, P1 is connected to P4, P2 is connected to P3, P5 is connected to P8, and P6 is connected to P7; In working mode 2, P1 is connected to P3, P2 is connected to P4, P5 is connected to P8, and P6 is connected to P7; In working mode 3, P1 is connected to P3, P2 is connected to P4, P5 is connected to P7, and P6 is connected to P8; 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.

10. 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 6 to 9.

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