An oscillator circuit and a voltage-controlled oscillator

Abstract

The present application relates to the field of power electronics, and discloses an oscillation circuit, which includes: a first inductive reactance circuit for providing a first inductive reactance, a second inductive reactance circuit for providing a second inductive reactance, a first bias circuit for providing a first bias voltage, a second bias circuit for providing a second bias voltage, a first switch tube, and a second switch tube; the first inductive reactance circuit and the second inductive reactance circuit both include a third switch tube, a fourth switch tube, and a first capacitor. Compared with the traditional LC oscillation circuit, the purpose of outputting an oscillation signal is achieved through the combination of a switch tube and a capacitor, which can significantly reduce the area occupied by the oscillation circuit while ensuring the oscillation performance, and is convenient for designing and using an oscillation chip. In addition, the present application also provides a voltage-controlled oscillator, including the above-mentioned oscillation circuit, with the same effect as above.

Description

Technical Field

[0001] The present application relates to the field of power electronics, and in particular to an oscillation circuit and a voltage-controlled oscillator. Background Art

[0002] In signal generators, communication equipment and some DC electronic devices, an oscillation circuit is needed to generate an AC signal to control the operating frequency of the device. The commonly used oscillation circuit is the LC oscillation circuit. Figure 1 A structural diagram of an LC oscillator circuit provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the LC oscillation circuit includes an inductive reactance circuit for providing inductive reactance and a bias circuit for providing bias voltage. It uses the resonance of inductance and capacitance to generate oscillation, is not easily affected by noise signals, and has a low phase noise of the output oscillation signal. However, the LC oscillation circuit needs to integrate the inductive device in the chip of the electronic device, which will occupy a large amount of chip area and bring inconvenience to the design and use of the electronic chip.

[0003] It can be seen that how to provide a new oscillation circuit and reduce the area occupied by the circuit is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0004] The purpose of the present application is to provide an oscillation circuit and a voltage-controlled oscillator to reduce the area occupied by the oscillation circuit.

[0005] In order to solve the above technical problems, the present application provides an oscillation circuit, comprising: a first inductive reactance circuit 1 for providing a first inductive reactance, a second inductive reactance circuit 2 for providing a second inductive reactance, a first bias circuit 3 for providing a first bias voltage, a second bias circuit 4 for providing a second bias voltage, a first switch tube, and a second switch tube;

[0006] The first inductive reactance circuit 1 and the second inductive reactance circuit 2 both include a third switch tube, a fourth switch tube, and a first capacitor;

[0007] The control end of the third switch tube is connected to the second end of the first capacitor, the first end of the third switch tube is connected to the second end of the fourth switch tube, the first end of the fourth switch tube is connected to the second end of the first capacitor, the first end of the first capacitor and the second end of the third switch tube are both grounded, the control end of the fourth switch tube is connected to the signal source, and the connection point between the first end of the third switch tube and the second end of the fourth switch tube serves as the output end of the first inductive reactance circuit 1;

[0008] The input end of the first bias circuit 3 is connected to a power supply, and the output end of the first bias circuit is connected to the output end of the first inductive reactance circuit 1 to serve as a first differential signal output end of the oscillator circuit; the input end of the second bias circuit 4 is connected to a power supply, and the output end of the second bias circuit is connected to the output end of the second inductive reactance circuit 2 to serve as a second differential signal output end of the oscillator circuit;

[0009] The control end of the first switch tube is connected to the second differential signal output end, the control end of the second switch tube is connected to the first differential signal output end, the first end of the first switch tube is connected to the first differential signal output end, the first end of the second switch tube is connected to the second differential signal output end, and the second end of the first switch tube and the second end of the second switch tube are both grounded.

[0010] Preferably, the first bias circuit 3 and the second bias circuit 4 both include a fifth switch tube, a sixth switch tube, and a second capacitor;

[0011] The first end and the control end of the fifth switch tube are both connected to the first end of the sixth switch tube, and the connection point is the output end of the first bias circuit 3 and the second bias circuit 4; the control end of the sixth switch tube is connected to the second end of the fifth switch tube and the first end of the second capacitor; the second end of the sixth switch tube is connected to the second end of the second capacitor, and the connection point is the input end of the first bias circuit 3 and the second bias circuit 4.

[0012] Preferably, the first bias circuit 3 and the second bias circuit 4 both include resistors and inductors;

[0013] The first end of the inductor is connected to the power supply and serves as an input end of the first bias circuit 3 and the second bias circuit 4, and the second end of the inductor is connected to the first end of the resistor;

[0014] The second end of the resistor is connected to the output ends of the first inductive reactance circuit 1 and the second inductive reactance circuit 2 to serve as the output end of the first bias circuit 3 and the second bias circuit 4 .

[0015] Preferably, it further comprises a first filtering circuit 5 and a second filtering circuit 6;

[0016] The first end of the first filter circuit 5 is connected to the first end of the first switch tube, the first end of the second filter circuit 6 is connected to the first end of the second switch tube, and the second end of the first filter circuit 5 and the second end of the second filter circuit 6 are both grounded.

[0017] Preferably, the first filter circuit 5 is a filter capacitor.

[0018] Preferably, the second filter circuit 6 is a filter capacitor.

[0019] Preferably, the inductor is a variable inductor.

[0020] Preferably, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube are all MOS tubes.

[0021] In order to solve the above technical problems, the present application also provides a voltage-controlled oscillator, including the above oscillation circuit.

[0022] The present application provides an oscillation circuit, including: a first inductive reactance circuit for providing a first inductive reactance, a second inductive reactance circuit for providing a second inductive reactance, a first bias circuit for providing a first bias voltage, a second bias circuit for providing a second bias voltage, a first switch, and a second switch tube; the first inductive reactance circuit and the second inductive reactance circuit both include a third switch tube, a fourth switch tube, and a first capacitor, and the connection relationship thereof is as described above. In the scheme provided in the present application, the combination of the switch tube and the capacitor provides an inductive reactance for the load structure formed by the first switch tube and the second switch tube, so that the oscillation circuit can output an oscillation signal. It can be seen that, compared with the traditional LC oscillation circuit, the purpose of outputting an oscillation signal is achieved by the combination of the switch tube and the capacitor, which can significantly reduce the area occupied by the oscillation circuit on the basis of ensuring the oscillation performance, and is convenient for the design and use of the oscillation chip.

[0023] In addition, the present application also provides a voltage-controlled oscillator, including the oscillation circuit described above, with the same effect as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A structural diagram of an LC oscillation circuit provided in an embodiment of the present application;

[0026] FIG. 2( a ) is a structural diagram of an oscillation circuit provided in an embodiment of the present application;

[0027] FIG2( b ) is a structural diagram of another oscillation circuit provided in an embodiment of the present application;

[0028] The reference numerals are as follows: 1 is a first inductive reactance circuit, 2 is a second inductive reactance circuit, 3 is a first bias circuit, 4 is a second bias circuit, 5 is a first filtering circuit, and 6 is a second filtering circuit. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] The core of this application is to provide an oscillation circuit and a voltage-controlled oscillator.

[0031] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] In the application scenario of the oscillation circuit, the LC oscillation circuit uses LC resonance to make the circuit oscillate, and the frequency of its output signal is:

[0033]

[0034] Among them, L is the value of the inductor in the oscillation circuit, C is the value of the capacitor in the oscillation circuit, the frequency of the output signal is not easily affected by the noise signal in the circuit, and the output oscillation signal has low phase noise, which is suitable for high-performance applications. However, the inductor needs to be integrated in the chip, which will occupy a large amount of chip area.

[0035] FIG. 2( a ) is a structural diagram of an oscillation circuit provided in an embodiment of the present application, and FIG. 2( b ) is a structural diagram of another oscillation circuit provided in an embodiment of the present application. As shown in FIG. 2( a ) or FIG. 2( b ), the oscillation circuit includes: a first inductive reactance circuit 1 for providing a first inductive reactance, a second inductive reactance circuit 2 for providing a second inductive reactance, a first bias circuit 3 for providing a first bias voltage, a second bias circuit 4 for providing a second bias voltage, a first switch tube M1, and a second switch tube M2;

[0036] The first inductive reactance circuit 1 and the second inductive reactance circuit 2 both include a third switch tube M3, a fourth switch tube M4, and a first capacitor C1;

[0037] The control end of the third switch tube M3 is connected to the second end of the first capacitor C1, the first end of the third switch tube M3 is connected to the second end of the fourth switch tube M4, the first end of the fourth switch tube M4 is connected to the second end of the first capacitor C1, the first end of the first capacitor C1 and the second end of the third switch tube M3 are both grounded, the control end of the fourth switch tube M4 is connected to the signal source, and the connection point between the first end of the third switch tube M3 and the second end of the fourth switch tube M4 serves as the output end of the first inductive reactance circuit 1;

[0038] The input end of the first bias circuit 3 is connected to the power supply, and the output end of the first bias circuit 3 is connected to the output end of the first inductive reactance circuit 1 to serve as the first differential signal output end of the oscillation circuit; the input end of the second bias circuit 4 is connected to the power supply, and the output end of the second bias circuit 4 is connected to the output end of the second inductive reactance circuit 2 to serve as the second differential signal output end of the oscillation circuit;

[0039] The control end of the first switch tube M1 is connected to the second differential signal output end, the control end of the second switch tube M2 is connected to the first differential signal output end, the first end of the first switch tube M1 is connected to the first differential signal output end, the first end of the second switch tube M2 is connected to the second differential signal output end, and the second end of the first switch tube M1 and the second end of the second switch tube M2 are both grounded.

[0040] In this embodiment, only the first inductive reactance circuit 1 and the second inductive reactance circuit 2 are limited, and the first bias circuit 3 and the second bias circuit 4 can be bias circuits including a switch tube and a capacitor, or can provide a bias voltage through a combination of an inductor and a capacitor, which is not limited here. It should be noted that the first bias circuit 3 and the second bias circuit 4 have the same structure to ensure that the frequency and amplitude of the output signal of the first differential signal output terminal and the second differential signal output terminal of the oscillation circuit are the same.

[0041] It can be understood that when the first bias circuit 3 and the second bias circuit 4 are bias circuits including switching tubes and capacitors, the models of the switching tubes and capacitors in the bias circuits can be the same as or different from the models of the corresponding electronic devices in the inductive reactance circuit. There is no limitation here, and the capacitance range of the capacitor is 1-100pF.

[0042] As shown in FIG2(a), the output end of the oscillation circuit is the first differential signal output end and the second differential signal output end, the control end of the oscillation circuit is the connection point of the control end of the fourth switch tube M4 of the first inductive reactance circuit 1 and the second inductive reactance circuit 2, and the input signal of the control end is V c In a specific implementation, the signal strength outputted from the differential signal output terminal can be controlled by adjusting the voltage amplitude of the input signal at the control terminal. It can be understood that when a combination of a switch tube and a capacitor is used as an inductive reactance circuit or a bias circuit, the circuit unit is equivalent to a structure in which an inductor and a resistor are connected in series in a traditional oscillation circuit.

[0043] It is understandable that the switch tube may be a triode or a MOS tube. In this embodiment, the MOS tube is taken as an example to illustrate the oscillation circuit.

[0044] During the operation of the oscillation circuit, a test voltage V is applied to the drain of the third switch tube M3. x At this time, the gate voltage V g3 satisfy:

[0045]

[0046] Wherein, C1 is the capacitance of the first capacitor C1, s is the Laplace operator, and rds4 is the equivalent voltage between the drain and the source of the fourth switch tube M4.

[0047] Since the drain of the fourth switch tube M4 has no DC path, the DC current flowing through the fourth switch tube M4 is 0 at this time. c The voltage difference between the source and gate of the fourth switch tube M4 is greater than the on-state voltage V th4 When (that is, to ensure V c The difference between the voltage at the source of the fourth switch tube M4 and V th4 ), the fourth switch tube M4 is in a deep triode state, and the current flowing through the fourth switch tube M4 is proportional to the voltage across the fourth switch tube M4. In a specific implementation, V c The value of is usually 1V. At this time, the equivalent voltage rds4 between the drain and source of the fourth switch tube M4 satisfies:

[0048]

[0049] Wherein, β4 is the transconductance parameter of the fourth switch tube M4, which is a constant determined by the process and size of the fourth switch tube M4. s4 is the source voltage of the fourth switch tube M4.

[0050] At the test voltage V x Under the action of the test current I flowing through the third switch tube M3 x satisfy:

[0051] I x =V g3 *gm3;

[0052] At this time, the equivalent impedance Z3 viewed from the drain of the third switch tube M3 satisfies:

[0053]

[0054]

[0055] Among them, L m is the inductance value, R m is the resistance value, and gm3 is the transconductance parameter of the third switch tube.

[0056] It can be seen from the above formula that the first inductive reactance circuit 1 and the second inductive reactance circuit 2 composed of the third switch tube M3, the fourth switch tube M4, and the first capacitor C1 can be equivalent to an inductance value of L m The inductive device and a resistor value R mseries connection of resistive devices.

[0057] In a specific implementation, the first switch tube M1 and the second switch tube M2 form a negative resistance structure, and their equivalent impedances are respectively and The impedance of the equivalent resistor Rm in the above formula can be offset, wherein gm1 is the transconductance parameter of the first switch tube M1, and gm2 is the transconductance parameter of the second switch tube M2.

[0058] It can be understood that, as shown in FIG2(a), when the first bias circuit 3 and the second bias circuit 4 are both circuits composed of an inductor Ln and a resistor Rn, the first bias circuit 3 and the second bias circuit 4 provide a bias voltage for the negative resistance structure composed of the first switch tube M1 and the second switch tube M2. In addition, the inductor Ln has the property of isolating AC, which can remove the clutter AC signal in the power supply, and can make the bias voltage provided to the load structure more stable.

[0059] In a specific implementation, the inductance of the equivalent inductance of the inductive reactance circuit is determined by the control terminal input signal V c The negative resistance structure formed by the first switch tube M1 and the second switch tube M2 offsets the impedance R of the inductive reactance circuit. m , the signal frequency output by the oscillation circuit is:

[0060]

[0061] Wherein, C2 is the capacitance value of the second capacitor C2,

[0062] It can be understood that the source voltage V s4 Determined by the common mode current of the oscillation circuit, its magnitude is basically unchanged. Therefore, the frequency of the oscillation circuit output signal is the same as the control terminal input signal V c Inversely proportional to the control input signal V c The smaller the output signal frequency F out The larger the value, the greater the V c The purpose of adjusting the output signal of the oscillation circuit can be achieved, thereby realizing the function of the voltage-controlled oscillator.

[0063] In the present embodiment, an oscillation circuit is provided, which includes: a first inductive reactance circuit for providing a first inductive reactance, a second inductive reactance circuit for providing a second inductive reactance, a first bias circuit for providing a first bias voltage, a second bias circuit for providing a second bias voltage, a first switch tube, and a second switch tube; the first inductive reactance circuit and the second inductive reactance circuit both include a third switch tube, a fourth switch tube, a first capacitor, and / or a first bias circuit, and the second bias circuit both include a third switch tube, a fourth switch tube, and a first capacitor; wherein the connection relationship between the first capacitor, the third switch tube, and the fourth switch tube is as described above. Compared with the traditional LC oscillation circuit, the purpose of outputting an oscillation signal is achieved by combining a switch tube and a capacitor, which can significantly reduce the area occupied by the oscillation circuit on the basis of ensuring the oscillation performance, and is convenient for designing and using oscillation chips.

[0064] In a specific implementation, the structure of the oscillation circuit can be that the first bias circuit 3, the second bias circuit 4, the first inductive reactance circuit 1, and the second inductive reactance circuit 2 all include switch tubes and capacitors, and the switch tubes and capacitors are used to provide bias voltage and inductive reactance; or the first bias circuit 3 and the second bias circuit 4 all include switch tubes and capacitors, and the first inductive reactance circuit 1 and the second inductive reactance circuit 2 all include inductive devices and resistive devices. It should be noted that in order to ensure the stability of the output signal of the oscillation circuit, the first inductive reactance circuit 1 and the second inductive reactance circuit 2 are mirror circuits of each other, and the first bias circuit 3 and the second bias circuit 4 are mirror circuits of each other.

[0065] In a specific implementation, the first bias circuit 3 and the second bias circuit 4 are used to provide a bias voltage for the negative resistance circuit formed by the first switch tube M1 and the second switch tube M2 (provide a gate voltage for the first switch tube M1 and the second switch tube M2). As shown in FIG2(a), when the first bias circuit 3 and the second bias circuit 4 both include an inductor Ln and a resistor Rn, the first end of the inductor Ln is connected to the power supply as the input end of the first bias circuit 3 and the second bias circuit 4, and the second end of the inductor Ln is connected to the first end of the resistor Rn; the second end of the resistor Rn is connected to the output ends of the first inductive reactance circuit 1 and the second inductive reactance circuit 2 as the output end of the first bias circuit 3 and the second bias circuit 4.

[0066] It can be understood that, since the chip area occupied by the inductor Ln is relatively large, in order to further reduce the area occupied by the oscillation circuit, the structure of the oscillation circuit can be: the first bias circuit 3 and the second bias circuit 4 both include the third switch tube M3, the fourth switch tube M4 and the first capacitor C1, and the first inductive reactance circuit 1 and the second inductive reactance circuit 2 both include the fifth switch tube M5, the sixth switch tube M6 and the second capacitor C2. As shown in FIG2(b), the first end and the control end of the fifth switch tube M5 are both connected to the first end of the sixth switch tube M6, and the connection point is the output end of the first bias circuit 3 and the second bias circuit 4; the control end of the sixth switch tube M6 is connected to the second end of the fifth switch tube M5 and the first end of the second capacitor C2; the second end of the sixth switch tube M6 is connected to the second end of the second capacitor C2, and the connection point is the input end of the first bias circuit 3 and the second bias circuit 4.

[0067] As shown in FIG. 2( b ), the bias circuit composed of the fifth switch tube M5 , the sixth switch tube M6 and the second capacitor C2 can be equivalent to a combination of an inductive device and a resistive device. The inductance value L of the inductive device is n satisfy:

[0068]

[0069] Wherein, C2 is the capacitance value of the second capacitor C2, gm5 is the transconductance parameter of the fifth switch tube M5, gm6 is the transconductance parameter of the sixth switch tube M6, and the resistance value R of the resistive device is n satisfy:

[0070]

[0071] In a specific implementation, the fifth switch tube M5 and the sixth switch tube M6 are selected appropriately so that the negative resistance structure circuit composed of the first switch tube M1 and the second switch tube M2 can offset the equivalent impedance Rn, thereby providing a bias voltage for the negative resistance structure circuit.

[0072] In this embodiment, a bias circuit including an inductor and a resistor or a bias circuit including a switch tube and a capacitor is selected to provide a bias voltage for the oscillation circuit, thereby ensuring that the oscillation circuit can output an AC signal. Furthermore, a bias circuit including a fifth switch tube M5, a sixth switch tube M6 and a second capacitor C2 is used to reduce the chip area occupied by the oscillation circuit, making it easier for R&D personnel to design and generate chips.

[0073] In a specific implementation, the voltage signal outputted at the output end has signals of different frequencies. In order to screen the voltage signal to remove clutter, based on the above embodiment, the oscillation circuit further includes: a first filter circuit 5 and a second filter circuit 6;

[0074] The first end of the first filter circuit 5 is connected to the first end of the first switch tube M1 , the first end of the second filter circuit 6 is connected to the first end of the second switch tube M2 , and the first end of the first filter circuit 5 and the second end of the second filter circuit 6 are both grounded.

[0075] Furthermore, in order to reduce the cost of the filter circuit and the area occupied by the oscillation circuit, the first filter circuit 5 and the second filter circuit 6 are both filter capacitors C3.

[0076] In this embodiment, a filter circuit is connected to the output end to filter out clutter interference signals in the common terminal voltage signal.

[0077] During the operation of the oscillation circuit, when the first inductive circuit 1 and the second inductive circuit 2 are both inductive circuits composed of inductors and resistors, in order to enable the oscillation circuit to meet the working requirements of different situations, it is necessary to adjust the output signal of the oscillation circuit, usually by adjusting the bias value of the inductor and the capacitance of the capacitor.

[0078] In order to prevent the increase of circuit cost caused by frequent replacement of circuit components and to make the adjustment process simpler, based on the above embodiment, the inductor is a variable inductor.

[0079] In this embodiment, by selecting a variable inductor as the inductor, the circuit cost is reduced and the adjustment process is made simpler.

[0080] In a specific implementation, the switch tube includes a MOS tube and a triode, wherein the triode is mostly used in current drive circuits, while the MOS tube is a voltage control device and is often used in voltage drive circuits. The MOS tube has the advantages of low power consumption and high output impedance, and has good temperature characteristics and noise characteristics, which can make the circuit more stable. In a specific implementation, the MOS tube has a much higher upper frequency limit than the triode, and is safer and more stable, so the MOS tube is usually selected as the switch device.

[0081] On the basis of the above embodiment, the first switch tube M1, the second switch tube M2, the third switch tube M3, the fourth switch tube M4, the fifth switch tube M5, and the sixth switch tube M6 are all MOS tubes. The MOS tube used in this embodiment can be an NMOS tube or a PMOS tube. The user can select a suitable MOS tube according to the actual situation. In this embodiment, a PMOS tube is selected as the switch device.

[0082] It should be noted that each switch tube can be a MOS tube with a built-in freewheeling diode, or a MOS tube that requires an external freewheeling diode, which is not limited here.

[0083] In this embodiment, MOS tubes are selected as switch tubes, which can reduce the power consumption of the circuit and make the circuit more stable and reliable.

[0084] In addition, this embodiment also provides a voltage-controlled oscillator, which, in addition to the above oscillation circuit, also includes a control unit, external voltage and other components and other subsequent circuits, etc. The specific implementation of the oscillation circuit is described above and will not be repeated here.

[0085] This embodiment provides a voltage-controlled oscillator, including an oscillation circuit, the oscillation circuit including: a first inductive reactance circuit for providing a first inductive reactance, a second inductive reactance circuit for providing a second inductive reactance, a first bias circuit for providing a first bias voltage, a second bias circuit for providing a second bias voltage, a first switch tube, and a second switch tube; the first inductive reactance circuit and the second inductive reactance circuit both include a third switch tube, a fourth switch tube, and a first capacitor, wherein the connection relationship between the first capacitor, the third switch tube, and the fourth switch tube is shown in FIG2(a) or FIG2(b). Compared with the traditional LC oscillation circuit, the purpose of outputting an oscillation signal is achieved by combining a switch tube and a capacitor, which can significantly reduce the area occupied by the oscillation circuit while ensuring the oscillation performance, and is convenient for designing and using the oscillation chip.

[0086] An oscillation circuit and a voltage-controlled oscillator provided by the present application are described in detail above. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can refer to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0087] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. An oscillator circuit, characterized in that: include: A first inductive reactance circuit (1) for providing a first inductive reactance, a second inductive reactance circuit (2) for providing a second inductive reactance, a first bias circuit (3) for providing a first bias voltage, a second bias circuit (4) for providing a second bias voltage, a first switch tube, and a second switch tube; The first inductive reactance circuit (1) and the second inductive reactance circuit (2) both comprise a third switch tube, a fourth switch tube, and a first capacitor; The control end of the third switch tube is connected to the second end of the first capacitor, the first end of the third switch tube is connected to the second end of the fourth switch tube, the first end of the fourth switch tube is connected to the second end of the first capacitor, the first end of the first capacitor and the second end of the third switch tube are both grounded, the control ends of the two fourth switch tubes are connected to a signal source, and the connection point between the first end of the third switch tube and the second end of the fourth switch tube serves as the output end of the first inductive reactance circuit (1); The input end of the first bias circuit (3) is connected to a power supply, and the output end of the first bias circuit (3) is connected to the output end of the first inductive reactance circuit (1) to serve as a first differential signal output end of the oscillator circuit; the input end of the second bias circuit (4) is connected to a power supply, and the output end of the second bias circuit (4) is connected to the output end of the second inductive reactance circuit (2) to serve as a second differential signal output end of the oscillator circuit; The control end of the first switch tube is connected to the second differential signal output end, the control end of the second switch tube is connected to the first differential signal output end, the first end of the first switch tube is connected to the first differential signal output end, the first end of the second switch tube is connected to the second differential signal output end, and the second end of the first switch tube and the second end of the second switch tube are both grounded.

2. The oscillation circuit according to claim 1, characterized in that: The first bias circuit (3) and the second bias circuit (4) both include a fifth switch tube, a sixth switch tube, and a second capacitor; The first end and the control end of the fifth switch tube of the first bias circuit (3) are both connected to the first end of the sixth switch tube, and the connection point is the output end of the first bias circuit (3); The first end and the control end of the fifth switch tube of the second bias circuit (4) are both connected to the first end of the sixth switch tube, and the connection point is the output end of the second bias circuit (4); The control end of the sixth switch tube is connected to the second end of the fifth switch tube and the first end of the second capacitor; The second end of the sixth switch tube of the first bias circuit (3) is connected to the second end of the second capacitor, and the connection point is the input end of the first bias circuit (3); The second end of the sixth switch tube of the second bias circuit (4) is connected to the second end of the second capacitor, and the connection point is the input end of the second bias circuit (4).

3. The oscillation circuit according to claim 1, characterized in that: The first bias circuit (3) and the second bias circuit (4) both include a resistor and an inductor; The first end of the inductor of the first bias circuit is connected to the power supply as an input end of the first bias circuit (3); The first end of the inductor of the second bias circuit is connected to the power supply as an input end of the second bias circuit (4); the second end of the inductor is connected to the first end of the resistor; The second end of the resistor of the first bias circuit (3) is connected to the output ends of the first inductive reactance circuit (1) and the second inductive reactance circuit (2), serving as the output end of the first bias circuit (3). The second end of the resistor of the second bias circuit (4) is connected to the output ends of the first inductive reactance circuit (1) and the second inductive reactance circuit (2) to serve as the output end of the second bias circuit (4).

4. The oscillator circuit according to any one of claims 1 to 3, characterized in that: It also includes a first filtering circuit (5) and a second filtering circuit (6); The first end of the first filter circuit (5) is connected to the first end of the first switch tube, the first end of the second filter circuit (6) is connected to the first end of the second switch tube, and the second end of the first filter circuit (5) and the second end of the second filter circuit (6) are both grounded.

5. The oscillation circuit according to claim 4, characterized in that: The first filter circuit (5) is a filter capacitor.

6. The oscillation circuit according to claim 4, characterized in that: The second filter circuit (6) is a filter capacitor.

7. The oscillation circuit according to claim 3, characterized in that: The inductor is a variable inductor.

8. The oscillation circuit according to claim 2, characterized in that: The first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube are all MOS tubes.

9. A voltage-controlled oscillator, characterized in that: An oscillator circuit comprising any one of claims 1 to 8.

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