Voltage-controlled oscillator and electronic equipment

Abstract

The invention discloses a voltage-controlled oscillator and electronic equipment. The voltage-controlled oscillator comprises a sampling module, a voltage boosting module and an oscillator module, the sampling module is connected with the voltage boosting module; the voltage boosting module is connected with the oscillator module; wherein the sampling module is used for accessing a clock signal and maintaining the voltage unchanged when the clock signal is at a low level; the voltage boosting module is used for boosting an input voltage signal; the oscillator module comprises a frequency control unit and a phase inverter chain, the frequency control unit is used for controlling oscillation frequency and performing phase conversion on a signal, the phase inverter chain is used for delaying and inverting the signal, and the phase inverter chain comprises a plurality of phase inverters which are connected in sequence. The voltage-controlled oscillator does not need to use power supply voltage as control voltage, the oscillation amplitude is more stable, and sampling application can be conveniently and efficiently achieved. The method can be widely applied to the technical field of electronic equipment.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a voltage-controlled oscillator and electronic equipment. Background Art

[0002] A voltage-controlled oscillator (VCO) is an electronic oscillator whose output frequency can be controlled by an input voltage. In the circuit, the VCO receives a voltage signal as input and converts it into a varying frequency signal as output. This device is widely used in various electronic systems, especially in frequency modulation, phase modulation, phase-locked loops and other application scenarios. The working principle of the VCO is to adjust the resonant frequency of the oscillator by changing the capacitance or inductance value of the internal circuit, and this change is controlled by the input voltage. When the input voltage increases, the oscillation frequency usually increases; conversely, when the input voltage decreases, the oscillation frequency decreases. Therefore, the VCO can provide an output frequency that is proportional to the input voltage. VCO plays an important role in communication systems, such as generating radio frequency signals in wireless communications, generating clock signals in digital circuits, and tracking or locking the frequency of external reference signals in phase-locked loops.

[0003] At present, the existing ring voltage-controlled oscillators usually use the power supply voltage as the control voltage. Firstly, the oscillation amplitude of this type of oscillator changes greatly with the change of the control voltage; secondly, if it is to be used as an analog-to-digital converter based on a voltage-controlled oscillator, a sampling module cannot be directly connected to the control voltage, but a buffer must be added in the middle, which makes it inconvenient to use.

[0004] In summary, the problems existing in related technologies need to be solved urgently. Summary of the invention

[0005] The purpose of this application is to solve one of the technical problems existing in the related art to at least a certain extent.

[0006] To this end, an object of an embodiment of the present application is to provide a voltage-controlled oscillator and an electronic device.

[0007] In order to achieve the above technical objectives, the technical solutions adopted by the embodiments of the present application include:

[0008] On the one hand, an embodiment of the present application provides a voltage-controlled oscillator, including:

[0009] A sampling module, a voltage raising module and an oscillator module; the sampling module is connected to the voltage raising module, and the voltage raising module is connected to the oscillator module;

[0010] Wherein, the sampling module is used to access the clock signal and maintain the voltage unchanged during the period when the clock signal is at a low level;

[0011] The voltage raising module is used to raise the input voltage signal;

[0012] The oscillator module includes a frequency control unit and an inverter chain. The frequency control unit is used to control the frequency of oscillation and perform a phase shift on the signal. The inverter chain is used to delay and invert the signal. The inverter chain includes a plurality of inverters connected in sequence.

[0013] In addition, the voltage-controlled oscillator according to the above embodiment of the present application may also have the following additional technical features:

[0014] Further, in one embodiment of the present application, the sampling module includes a first capacitor and a fifth transistor;

[0015] The drain of the fifth transistor is connected to the input signal, the gate of the fifth transistor is used to access the clock signal, and the source of the fifth transistor is grounded through the first capacitor; the source of the fifth transistor is also connected to the voltage boosting module.

[0016] Further, in one embodiment of the present application, the voltage raising module includes a first transistor and a second transistor;

[0017] The gate of the first transistor is connected to the source of the fifth transistor, the source of the first transistor is grounded, the source of the first transistor is also connected to the oscillator module, the drain of the first transistor is connected to the source of the second transistor, the drain of the first transistor and the source of the second transistor are also connected to the oscillator module, and the drain of the second transistor and the gate of the second transistor are connected to a power supply.

[0018] Further, in one embodiment of the present application, the frequency control unit includes a second capacitor, a third transistor and a fourth transistor; the inverter chain includes an odd number of first inverters and an even number of second inverters, the sum of the number of the first inverters and the second inverters is greater than or equal to 7, each of the first inverters forms a first chain, each of the second inverters forms a second chain, the first chain and the second chain are connected, and the connection between the first chain and the second chain is the output port of the voltage-controlled oscillator;

[0019] The drain of the first transistor and the source of the second transistor are connected to the gate of the third transistor, the source of the third transistor is grounded, the drain of the third transistor and the source of the fourth transistor are grounded through the second capacitor, the drain of the third transistor and the source of the fourth transistor are also connected to the first chain, the drain of the fourth transistor is connected to a power supply, and the gate of the fourth transistor is connected to the second chain.

[0020] Further, in an embodiment of the present application, the frequency control unit includes a second capacitor, a third transistor and a fourth transistor; the inverter chain includes an even number of first inverters, each of the first inverters forms a third chain, the third chain includes an output port of a voltage-controlled oscillator, and the number of first inverters on both sides of the output port of the voltage-controlled oscillator is an even number;

[0021] The drain of the first transistor and the source of the second transistor are connected to the gate of the third transistor, the drain of the third transistor is connected to a power supply, the source of the third transistor is connected to the first end of the third chain, the first end of the second capacitor and the drain of the fourth transistor; the second end of the third chain is connected to the gate of the fourth transistor, and the source of the fourth transistor and the second end of the second capacitor are grounded.

[0022] Further, in one embodiment of the present application, the number of the first inverters is 6.

[0023] Furthermore, in one embodiment of the present application, each transistor in the voltage-controlled oscillator is a unipolar thin-film transistor.

[0024] Further, in one embodiment of the present application, the first inverter includes a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor and a tenth transistor;

[0025] The gate of the sixth transistor and the gate of the ninth transistor are used to connect to an input signal, the source of the sixth transistor and the source of the ninth transistor are grounded, the source of the seventh transistor is connected to the drain of the sixth transistor, the source of the seventh transistor is also connected to the gate of the tenth transistor, the gate and drain of the seventh transistor are connected to the source of the eighth transistor, and the gate and drain of the eighth transistor are connected to a power supply;

[0026] The drain of the ninth transistor and the source of the tenth transistor are connected to the output port of the first inverter, and the drain of the tenth transistor is connected to a power supply.

[0027] Further, in one embodiment of the present application, the second inverter includes an eleventh transistor, a twelfth transistor, a thirteenth transistor and a fourteenth transistor;

[0028] The gate of the eleventh transistor and the gate of the thirteenth transistor are used to connect to an input signal, the source of the eleventh transistor and the source of the thirteenth transistor are grounded, the drain of the eleventh transistor is connected to the source of the twelfth transistor and the gate of the fourteenth transistor, and the gate and drain of the twelfth transistor are connected to a power supply;

[0029] The drain of the thirteenth transistor and the source of the fourteenth transistor are connected to the output port of the second inverter, and the drain of the fourteenth transistor is connected to a power source.

[0030] On the other hand, an embodiment of the present application provides an electronic device, including the aforementioned voltage-controlled oscillator.

[0031] The advantages and benefits of the present application will be partially given in the following description, and partially become apparent from the following description, or be understood through the practice of the present application:

[0032] A voltage-controlled oscillator and electronic device disclosed in an embodiment of the present application, the voltage-controlled oscillator includes a sampling module, a voltage-raising module and an oscillator module; the sampling module is connected to the voltage-raising module, and the voltage-raising module is connected to the oscillator module; wherein the sampling module is used to access a clock signal and maintain the voltage unchanged during a period when the clock signal is at a low level; the voltage-raising module is used to raise the input voltage signal; the oscillator module includes a frequency control unit and an inverter chain, the frequency control unit is used to control the frequency of the oscillation and perform a phase shift on the signal, the inverter chain is used to delay and invert the signal, and the inverter chain includes a plurality of inverters connected in sequence. The voltage-controlled oscillator does not need to use the power supply voltage as the control voltage, the oscillation amplitude is more stable, and sampling applications can be conveniently and efficiently implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following introduction is made to the drawings of the embodiments of the present application 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 paying any creative work.

[0034] Figure 1 A schematic diagram of a circuit principle of a voltage-controlled oscillator used in the related art is shown;

[0035] Figure 2 A schematic diagram of the circuit principle of a voltage-controlled oscillator provided in an embodiment of the present application is shown;

[0036] Figure 3 A schematic diagram of the circuit principle of another voltage-controlled oscillator provided in an embodiment of the present application is shown;

[0037] Figure 4 A schematic diagram of the circuit structure of a first inverter provided in an embodiment of the present application is shown;

[0038] Figure 5 A schematic diagram of the circuit structure of a second inverter provided in an embodiment of the present application is shown;

[0039] Figure 6 A frequency-voltage relationship diagram corresponding to a voltage-controlled oscillator provided in an embodiment of the present application using a VCO-odd oscillator module is shown;

[0040] Figure 7 A linear error diagram corresponding to a voltage-controlled oscillator provided in an embodiment of the present application using a VCO-odd oscillator module is shown;

[0041] Figure 8 A frequency-voltage relationship diagram corresponding to a voltage-controlled oscillator provided in an embodiment of the present application using a VCO-even oscillator module is shown;

[0042] Fig. 9 A linear error diagram corresponding to a voltage-controlled oscillator provided in an embodiment of the present application using a VCO-even oscillator module is shown;

[0043] Fig.10 A waveform diagram of a voltage-controlled oscillator provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0044] The present application is further described below in conjunction with the accompanying drawings and specific embodiments. The described embodiments should not be regarded as limiting the present application, and all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0045] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0046] In the description of the present application, it should be understood that the terms "length", "up", "down", "front", "back", "left", "right", "top", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] A voltage-controlled oscillator (VCO) is an electronic oscillator whose output frequency can be controlled by an input voltage. In the circuit, the VCO receives a voltage signal as input and converts it into a varying frequency signal as output. This device is widely used in various electronic systems, especially in frequency modulation, phase modulation, phase-locked loops and other application scenarios. The working principle of the VCO is to adjust the resonant frequency of the oscillator by changing the capacitance or inductance value of the internal circuit, and this change is controlled by the input voltage. When the input voltage increases, the oscillation frequency usually increases; conversely, when the input voltage decreases, the oscillation frequency decreases. Therefore, the VCO can provide an output frequency that is proportional to the input voltage. VCO plays an important role in communication systems, such as generating radio frequency signals in wireless communications, generating clock signals in digital circuits, and tracking or locking the frequency of external reference signals in phase-locked loops.

[0049] At present, the existing ring voltage-controlled oscillator usually uses the power supply voltage as the control voltage. The oscillation amplitude of this type of oscillator changes greatly with the change of the control voltage. Secondly, if it is used as an analog-to-digital converter based on a voltage-controlled oscillator, a sampling module cannot be directly connected to the control voltage, but a buffer must be added in the middle, which makes it inconvenient to use. For example, Figure 1 FIG. 1 is a schematic diagram showing the circuit principle of a voltage-controlled oscillator used in the related art. Figure 1 The voltage-controlled oscillator shown in the figure, in order to realize the sampling function of ADC, must add a sampling circuit before the control voltage. However, the power supply voltage of the ring oscillator is usually connected to the drain of the transistor, and a certain current is required to drive the ring oscillator. Obviously, to realize the sampling function, a buffer must be required between the sampling circuit and the ring oscillator. Such a buffer is not difficult to realize under CMOS technology, but because only n-type TFTs are used to realize the circuit, on the one hand, the buffer will consume a threshold voltage by the n-type load tube, and on the other hand, it is difficult for the buffer to achieve the ideal following characteristics. With the change of the control voltage, the amplitude of the oscillator waveform will also change significantly. If the control voltage is low, it may be difficult to identify the oscillation waveform, resulting in bit errors in the conversion process.

[0050] In view of this, a voltage-controlled oscillator and an electronic device are provided in an embodiment of the present application, the voltage-controlled oscillator includes a sampling module, a voltage-raising module and an oscillator module; the sampling module is connected to the voltage-raising module, and the voltage-raising module is connected to the oscillator module; wherein the sampling module is used to access the clock signal and maintain the voltage unchanged during the period when the clock signal is at a low level; the voltage-raising module is used to raise the input voltage signal; the oscillator module includes a frequency control unit and an inverter chain, the frequency control unit is used to control the frequency of the oscillation and perform a phase transformation on the signal, the inverter chain is used to delay and invert the signal, and the inverter chain includes a plurality of inverters connected in sequence. The voltage-controlled oscillator does not need to use the power supply voltage as the control voltage, the oscillation amplitude is more stable, and the sampling application can be conveniently and efficiently realized.

[0051] Below, in conjunction with specific drawings, a voltage-controlled oscillator and an electronic device provided in an embodiment of the present application are described in detail.

[0052] First, the voltage-controlled oscillator provided in the embodiments of the present application is introduced and described.

[0053] The present application provides a voltage-controlled oscillator in an embodiment, which can be applied to the technical field of electronic equipment. Specifically, the voltage-controlled oscillator provided in the embodiment of the present application mainly includes:

[0054] A sampling module, a voltage raising module and an oscillator module; the sampling module is connected to the voltage raising module, and the voltage raising module is connected to the oscillator module;

[0055] Wherein, the sampling module is used to access the clock signal and maintain the voltage unchanged during the period when the clock signal is at a low level;

[0056] The voltage raising module is used to raise the input voltage signal;

[0057] The oscillator module includes a frequency control unit and an inverter chain. The frequency control unit is used to control the frequency of oscillation and perform a phase shift on the signal. The inverter chain is used to delay and invert the signal. The inverter chain includes a plurality of inverters connected in sequence.

[0058] In an embodiment of the present application, a low-power voltage-controlled oscillator is provided, which may specifically include a sampling module, a voltage raising module and an oscillator module. Among them, the sampling module is connected to the voltage raising module, and the voltage raising module is connected to the oscillator module. The sampling module is mainly used to access the clock signal and keep the voltage unchanged when the clock signal is at a low level. The voltage raising module can raise the input voltage signal to a higher voltage so that the frequency control unit of the oscillator can maintain a sufficient on and off state to ensure the linearity of the oscillator; the oscillator module is composed of a frequency control unit and an inverter chain, wherein the inverter chain is used to provide signal delay and inversion, and the frequency control unit is used to control the frequency of the oscillation and provide a phase change to the signal, and the inverter chain includes multiple inverters connected in sequence. In an embodiment of the present application, a frequency control unit can be used to isolate the inverter chain and the sampling circuit to avoid using the power supply voltage as the control voltage.

[0059] In the embodiment of the present application, the oscillator module may specifically include two types, respectively denoted as VCO-even and VCO-odd, and the two oscillator modules have different numbers of inverter stages and phase transformations provided by the frequency control unit.

[0060] Reference Figure 2 , Figure 2 A schematic diagram of the circuit principle of a voltage-controlled oscillator provided in an embodiment of the present application is shown. Figure 2 In the circuit shown in FIG. 1 , the oscillator module used is VCO-odd, which can be recorded as the first oscillator module 231. Figure 3 , Figure 3 FIG. 1 shows a schematic diagram of the circuit principle of another voltage-controlled oscillator provided in an embodiment of the present application. Figure 3 In the circuit shown, the oscillator module used is VCO-even, which can be recorded as the second oscillator module 232. Figure 2 and Figure 3 , the specific circuit structure provided in the embodiments of the present application is introduced.

[0061] Specifically, in some embodiments, the sampling module 210 includes a first capacitor C1 and a fifth transistor M5;

[0062] The drain of the fifth transistor M5 is connected to the input signal, the gate of the fifth transistor M5 is used to access the clock signal, and the source of the fifth transistor M5 is grounded through the first capacitor C1; the source of the fifth transistor M5 is also connected to the voltage raising module 220.

[0063] In the embodiment of the present application, the sampling module 210 may include a first capacitor C1 and a fifth transistor M5. The gate of the fifth transistor M5 is used to access the clock signal. When the clock signal is at a high level, the voltage of the first capacitor C1 changes with the input voltage. When the signal is at a low level, the voltage of the first capacitor C1 maintains the voltage input at the last moment when the clock signal is at a high level, and the oscillation frequency of the oscillator remains unchanged.

[0064] Specifically, in some embodiments, the voltage raising module 220 includes a first transistor M1 and a second transistor M2;

[0065] The gate of the first transistor M1 is connected to the source of the fifth transistor M5, the source of the first transistor M1 is grounded, the source of the first transistor M1 is also connected to the oscillator module, the drain of the first transistor M1 is connected to the source of the second transistor M2, the drain of the first transistor M1 and the source of the second transistor M2 are also connected to the oscillator module, and the drain of the second transistor M2 and the gate of the second transistor M2 are connected to a power supply.

[0066] In an embodiment of the present application, the voltage boosting module 220 includes a first transistor M1 and a second transistor M2. The first transistor M1 and the second transistor M2 constitute an inverter. Within a certain voltage range, the inverter can maintain the linearity of the output voltage Vctrl, and at the same time can boost a lower input voltage to a high voltage value to ensure that the charging transistor is fully opened.

[0067] Reference Figure 2 Specifically, in some embodiments, the frequency control unit includes a second capacitor C2, a third transistor M3 and a fourth transistor M4; the inverter chain includes an odd number of first inverters and an even number of second inverters, the sum of the number of the first inverters and the second inverters is greater than or equal to 7, each of the first inverters forms a first chain, each of the second inverters forms a second chain, the first chain and the second chain are connected, and the connection between the first chain and the second chain is the output port of the voltage-controlled oscillator;

[0068] The drain of the first transistor M1 and the source of the second transistor M2 are connected to the gate of the third transistor M3, the source of the third transistor M3 is grounded, the drain of the third transistor M3 and the source of the fourth transistor M4 are grounded through the second capacitor C2, the drain of the third transistor M3 and the source of the fourth transistor M4 are also connected to the first chain, the drain of the fourth transistor M4 is connected to a power supply, and the gate of the fourth transistor M4 is connected to the second chain.

[0069] In the embodiment of the present application, for the oscillator module VCO-odd, its working principle is as follows: Assume Figure 2 Va in is a high level, at this time the second capacitor C2 will be charged, and Vb will rise; when Vb rises to a high level, it triggers the inverter chain level to flip, Va becomes a low level, at this time the second capacitor C2 will discharge, and Vb drops. When Vb drops to a low level, it triggers the inverter chain level to flip, and Va becomes a high level again. The above cycle is repeated in this way, thereby generating oscillations. Through appropriate design, the charging time of the second capacitor C2 and the delay of the inverter chain can be made much shorter than the discharge time, that is, the size of the charging transistor (i.e., the third transistor M3) is much larger than the discharge transistor (i.e., the fourth transistor M4), and the second capacitor C2 also takes a larger value, then the oscillation period is approximately equal to the discharge time, and the control voltage is connected to the gate of the discharge transistor, avoiding the need to provide a larger current at the control voltage, thereby requiring the addition of a buffer, which can reduce the cost of the circuit.

[0070] Reference Figure 3 Specifically, in some embodiments, the frequency control unit includes a second capacitor C2, a third transistor M3 and a fourth transistor M4; the inverter chain includes an even number of first inverters, each of which forms a third chain, and the third chain includes an output port of a voltage-controlled oscillator, and the number of first inverters on both sides of the output port of the voltage-controlled oscillator is an even number;

[0071] The drain of the first transistor M1 and the source of the second transistor M2 are connected to the gate of the third transistor M3, the drain of the third transistor M3 is connected to a power supply, the source of the third transistor M3 is connected to the first end of the third chain, the first end of the second capacitor C2 and the drain of the fourth transistor M4; the second end of the third chain is connected to the gate of the fourth transistor M4, and the source of the fourth transistor M4 and the second end of the second capacitor C2 are grounded.

[0072] In the embodiment of the present application, for the oscillator module VCO-even, it is an improved structure of VCO-odd. VCO-odd uses two second inverters with relatively large power consumption, and its inverter chain requires an odd number of stages and a minimum of 7 stages. In the oscillator module VCO-even, in order to reduce power consumption, the frequency control unit can be set to be dominated by the charging tube (i.e., the third transistor M3) to lead the oscillation cycle, and the voltage of each node thereof is exactly mirrored with that of VCO-odd. The inverter chain is an even number of stages, and there is no need to use a high-power second inverter, only 6 first inverters are required. The Va and Vb voltages change in the same direction, and the inversion function is realized by the frequency control unit, and its control voltage is connected to the charging tube. Through testing, the power consumption of VCO-odd and VCO-even are 134.3uW and 71.5uW, respectively. It can be seen that VCO-even does effectively reduce the power consumption of the oscillator.

[0073] In the embodiment of the present application, each transistor in the above-mentioned voltage-controlled oscillator may be a unipolar thin-film transistor.

[0074] Specifically, refer to Figure 4 , Figure 4 A schematic diagram of the circuit structure of a first inverter provided in an embodiment of the present application is shown. Figure 4 It can be seen that the first inverter includes a sixth transistor M6, a seventh transistor M7, an eighth transistor M8, a ninth transistor M9 and a tenth transistor M10; the gate of the sixth transistor M6 and the gate of the ninth transistor M9 are used to connect the input signal, the source of the sixth transistor M6 and the source of the ninth transistor M9 are grounded, the source of the seventh transistor M7 is connected to the drain of the sixth transistor M6, the source of the seventh transistor M7 is also connected to the gate of the tenth transistor M10, the gate and drain of the seventh transistor M7 are connected to the source of the eighth transistor M8, and the gate and drain of the eighth transistor M8 are connected to the power supply; the drain of the ninth transistor M9 and the source of the tenth transistor M10 are connected to the output port of the first inverter, and the drain of the tenth transistor M10 is connected to the power supply.

[0075] Specifically, refer to Figure 5 , Figure 5 A schematic diagram of the circuit structure of a second inverter provided in an embodiment of the present application is shown. Figure 5It can be seen that the second inverter includes an eleventh transistor M11, a twelfth transistor M12, a thirteenth transistor M13 and a fourteenth transistor M14; the gate of the eleventh transistor M11 and the gate of the thirteenth transistor M13 are used to connect the input signal, the source of the eleventh transistor M11 and the source of the thirteenth transistor M13 are grounded, the drain of the eleventh transistor M11 is connected to the source of the twelfth transistor M12 and the gate of the fourteenth transistor M14, and the gate and drain of the twelfth transistor M12 are connected to the power supply; the drain of the thirteenth transistor M13 and the source of the fourteenth transistor M14 are connected to the output port of the second inverter, and the drain of the fourteenth transistor M14 is connected to the power supply.

[0076] In the embodiment of the present application, a voltage is connected to the input end of the voltage-controlled oscillator, CLK is set to a high level, the output frequency is detected, and the corresponding frequency-voltage relationship diagram and linear error diagram under the two oscillator modules are obtained. Figure 6 This is the frequency-voltage relationship diagram of the voltage-controlled oscillator using the VCO-odd oscillator module. Figure 7 This is the linear error diagram corresponding to the voltage-controlled oscillator using the VCO-odd oscillator module; Figure 8 This is the frequency-voltage relationship diagram of the voltage-controlled oscillator using the VCO-even oscillator module. Fig. 9 This is the linear error diagram of the voltage-controlled oscillator using the VCO-even oscillator module. It can be seen that the performance of the two voltage-controlled oscillators is good, and the oscillation amplitude is more stable when the voltage-controlled oscillator uses the VCO-even oscillator module. Set CLK to a 50Hz square wave and the output to a 0.5Hz sine wave. Collect the waveforms of the voltage-controlled oscillator. The waveforms under the two oscillator modules are similar, so one is given as an example, such as Fig.10 As shown, it can be seen that the waveform collected by the voltage controlled oscillator is normal, which proves that the VCO can be connected to the sampling module 210 without a buffer, and the oscillation amplitude does not change significantly.

[0077] The voltage controlled oscillator in the embodiment of the present application has the following characteristics:

[0078] 1) When the voltage raising module 220 is used, the third transistor M3 needs to work in the deep linear region. The third transistor M3 is equivalent to a linear resistor to ensure the linearity of the oscillator. When the third transistor M3 works in the linear region, the voltage Vctrl needs to be controlled to a higher voltage value. When the level raising module is used, the voltage at the input end can be a lower value, which is convenient for processing general electrical signals.

[0079] 2) A frequency control unit is used. The oscillation frequency can be changed by changing the resistance of the third transistor M3. There is no need to use the power supply voltage as the control voltage. The frequency control unit acts as a buffer while controlling the oscillation frequency.

[0080] 3) The oscillation amplitude of the oscillator is more stable. When the power supply voltage is used as the control voltage, the change of the oscillation amplitude is usually close to 50%, while in this solution, the change of the oscillation amplitude is only about 20%.

[0081] 4) The oscillator implemented in this application has low power consumption, which is 134.3uW and 71.5uW respectively.

[0082] In an embodiment of the present application, an electronic device is also provided, which includes the aforementioned voltage-controlled oscillator.

[0083] It can be understood that the contents of the aforementioned voltage-controlled oscillator embodiment are applicable to the present electronic device embodiment, the functions specifically implemented by the present electronic device embodiment are the same as those of the aforementioned voltage-controlled oscillator embodiment, and the beneficial effects achieved are also the same as those achieved by the aforementioned voltage-controlled oscillator embodiment.

[0084] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the embodiments. Technical personnel familiar with the field can make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "another embodiment" or "certain embodiments" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. 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 the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A voltage-controlled oscillator, characterized in that: include: Sampling module, voltage boosting module and oscillator module; The sampling module is connected to the voltage raising module, and the voltage raising module is connected to the oscillator module; Wherein, the sampling module is used to access the clock signal and maintain the voltage unchanged during the period when the clock signal is at a low level; The voltage raising module is used to raise the input voltage signal; The oscillator module includes a frequency control unit and an inverter chain. The frequency control unit is used to control the frequency of oscillation and perform a phase shift on the signal. The inverter chain is used to delay and invert the signal. The inverter chain includes a plurality of inverters connected in sequence.

2. A voltage controlled oscillator according to claim 1, characterized in that: The sampling module includes a first capacitor and a fifth transistor; The drain of the fifth transistor is connected to the input signal, the gate of the fifth transistor is used to access the clock signal, and the source of the fifth transistor is grounded through the first capacitor; the source of the fifth transistor is also connected to the voltage boosting module.

3. A voltage controlled oscillator according to claim 2, characterized in that: The voltage raising module includes a first transistor and a second transistor; The gate of the first transistor is connected to the source of the fifth transistor, the source of the first transistor is grounded, the source of the first transistor is also connected to the oscillator module, the drain of the first transistor is connected to the source of the second transistor, the drain of the first transistor and the source of the second transistor are also connected to the oscillator module, and the drain of the second transistor and the gate of the second transistor are connected to a power supply.

4. A voltage controlled oscillator according to claim 3, characterized in that: The frequency control unit includes a second capacitor, a third transistor and a fourth transistor; the inverter chain includes an odd number of first inverters and an even number of second inverters, the sum of the number of the first inverters and the second inverters is greater than or equal to 7, each of the first inverters forms a first chain, each of the second inverters forms a second chain, the first chain is connected to the second chain, and the connection between the first chain and the second chain is the output port of the voltage-controlled oscillator; The drain of the first transistor and the source of the second transistor are connected to the gate of the third transistor, the source of the third transistor is grounded, the drain of the third transistor and the source of the fourth transistor are grounded through the second capacitor, the drain of the third transistor and the source of the fourth transistor are also connected to the first chain, the drain of the fourth transistor is connected to a power supply, and the gate of the fourth transistor is connected to the second chain.

5. The voltage controlled oscillator according to claim 3, characterized in that: The frequency control unit includes a second capacitor, a third transistor and a fourth transistor; the inverter chain includes an even number of first inverters, each of the first inverters forms a third chain, the third chain includes an output port of a voltage-controlled oscillator, and the number of first inverters on both sides of the output port of the voltage-controlled oscillator is an even number; The drain of the first transistor and the source of the second transistor are connected to the gate of the third transistor, the drain of the third transistor is connected to a power supply, the source of the third transistor is connected to the first end of the third chain, the first end of the second capacitor and the drain of the fourth transistor; the second end of the third chain is connected to the gate of the fourth transistor, and the source of the fourth transistor and the second end of the second capacitor are grounded.

6. A voltage controlled oscillator according to claim 5, characterized in that: The number of the first inverters is 6.

7. A voltage controlled oscillator according to any one of claims 2 to 6, characterized in that: Each transistor in the voltage-controlled oscillator is a unipolar thin-film transistor.

8. A voltage controlled oscillator according to claim 4 or 5, wherein the first inverter comprises a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor and a tenth transistor; The gate of the sixth transistor and the gate of the ninth transistor are used to connect to an input signal, the source of the sixth transistor and the source of the ninth transistor are grounded, the source of the seventh transistor is connected to the drain of the sixth transistor, the source of the seventh transistor is also connected to the gate of the tenth transistor, the gate and drain of the seventh transistor are connected to the source of the eighth transistor, and the gate and drain of the eighth transistor are connected to a power supply; The drain of the ninth transistor and the source of the tenth transistor are connected to the output port of the first inverter, and the drain of the tenth transistor is connected to a power supply.

9. The voltage controlled oscillator according to claim 4 or 5, wherein the second inverter comprises an eleventh transistor, a twelfth transistor, a thirteenth transistor and a fourteenth transistor; The gate of the eleventh transistor and the gate of the thirteenth transistor are used to connect to an input signal, the source of the eleventh transistor and the source of the thirteenth transistor are grounded, the drain of the eleventh transistor is connected to the source of the twelfth transistor and the gate of the fourteenth transistor, and the gate and drain of the twelfth transistor are connected to a power supply; The drain of the thirteenth transistor and the source of the fourteenth transistor are connected to the output port of the second inverter, and the drain of the fourteenth transistor is connected to a power source.

10. An electronic device, characterized in that: Comprising the voltage controlled oscillator as claimed in any one of claims 1 to 9.

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