Voltage-controlled oscillator and electronic device

Abstract

The application discloses a voltage-controlled oscillator and electronic equipment, the voltage-controlled oscillator comprises a sampling module, a voltage lifting module and an oscillator module; the sampling module is connected with the voltage lifting module, and the voltage lifting module is connected with the oscillator module; wherein the sampling module is used for inputting a clock signal and maintaining a voltage unchanged during a low voltage period of the clock signal; the voltage lifting module is used for lifting an input voltage signal; the oscillator module comprises a frequency control unit and an inverter chain; the frequency control unit is used for controlling an oscillation frequency and performing a one-phase transformation on a signal; the inverter chain is used for performing a signal delay and inversion; and the inverter chain comprises a plurality of inverter devices connected in sequence. The voltage-controlled oscillator does not need to use a power supply voltage as a control voltage, the oscillation amplitude is more stable, and sampling application can be conveniently and efficiently realized. The application can be widely applied in the technical field of electronic equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic devices, and in particular to a voltage-controlled oscillator and an electronic device. BACKGROUND

[0002] A voltage-controlled oscillator (VCO) is an electronic oscillator whose output frequency is controlled by an input voltage. In a circuit, a 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 loop, etc. The working principle of 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 also increases; conversely, when the input voltage decreases, the oscillation frequency decreases. Therefore, the VCO can provide an output frequency proportional to the input voltage. VCO plays an important role in communication systems, such as generating radio frequency signals in wireless communication, 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 oscillator usually uses the power supply voltage as the control voltage. This kind of oscillator has two problems: first, the amplitude of oscillation changes greatly with the change of control voltage; second, if it is used as an analog-to-digital converter based on voltage-controlled oscillator, a sampling module cannot be directly connected at the control voltage, but a buffer must be added in the middle, which makes it inconvenient to use.

[0004] In summary, the problems in the related art need to be solved urgently. SUMMARY

[0005] The present application aims to at least partly solve one of the technical problems in the related art.

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

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

[0008] In one aspect, the present application provides a voltage-controlled oscillator, comprising:

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

[0010] The sampling module is configured to access a clock signal and maintain the voltage unchanged during a low level of the clock signal.

[0011] The voltage lifting module is configured to lift the input voltage signal.

[0012] The oscillator module comprises a frequency control unit and an inverter chain, the frequency control unit is configured to control the frequency of oscillation and perform a phase transformation on the signal, and the inverter chain is configured to perform time delay and inversion on the signal, and the inverter chain comprises a plurality of inverters connected in sequence.

[0013] In addition, the voltage-controlled oscillator according to the above-mentioned embodiments of the present application can further have the following additional technical features.

[0014] Further, in an embodiment of the present application, the sampling module comprises a first capacitor and a fifth transistor.

[0015] The drain of the fifth transistor is connected to an input signal, the gate of the fifth transistor is configured to access a clock signal, and the source of the fifth transistor is grounded through the first capacitor; and the source of the fifth transistor is further connected to the voltage lifting module.

[0016] Further, in an embodiment of the present application, the voltage lifting module comprises 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 further connected to the oscillator module, the drain of the first transistor and the source of the second transistor are connected, the drain of the first transistor and the source of the second transistor are further 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 an embodiment of the present application, the frequency control unit comprises a second capacitor, a third transistor and a fourth transistor; the inverter chain comprises an odd number of first inverters and an even number of second inverters, the sum of the number of the first inverters and the number of the second inverters is greater than or equal to 7, each of the first inverters constitutes a first chain, each of the second inverters constitutes a second chain, the first chain and the second chain are connected, and the connection of the first chain and the second chain is an 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 comprises a second capacitor, a third transistor and a fourth transistor; the inverter chain comprises an even number of first inverters, each of the first inverters constitutes a third chain, and the third chain comprises 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 even.

[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 an embodiment of the present application, the number of first inverters is 6.

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

[0024] Further, in an embodiment of the present application, the first inverter comprises 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 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 the drain of the seventh transistor are connected to the source of the eighth transistor, the gate and the 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 an embodiment of the present application, the second inverter comprises 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 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 the 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 an output port of the second inverter, and the drain of the fourteenth transistor is connected to a power supply.

[0030] In another aspect, the embodiments of the present application provide an electronic device, comprising the voltage-controlled oscillator described above.

[0031] The advantages and beneficial effects of the present application will be partially given in the following description, partially will become obvious from the following description, or will be learned by the practice of the present application:

[0032] The voltage-controlled oscillator and the electronic device disclosed by the embodiments of the present application, the voltage-controlled oscillator comprises a sampling module, a voltage lifting module and an oscillator module; the sampling module is connected to the voltage lifting module, the voltage lifting module is connected to the oscillator module; wherein the sampling module is used to access a clock signal, and the voltage is maintained unchanged during the period when the clock signal is at a low level; the voltage lifting module is used to lift the input voltage signal; the oscillator module comprises a frequency control unit and an inverter chain, the frequency control unit is used to control the frequency of oscillation and to transform the signal by one phase, and the inverter chain is used to delay and invert the signal, and the inverter chain comprises 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. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following introduces the drawings of the related technical solutions in the embodiments of the present application or the prior art. It should be understood that the drawings in the following introduction are only for the convenience of clearly describing part of the embodiments of the technical solutions of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the premise of the drawings.

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

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

[0036] Figure 3 Fig. 2 shows a circuit schematic diagram of another voltage-controlled oscillator provided in the embodiments of the present application;

[0037] Figure 4 Fig. 3 shows a circuit structure schematic diagram of a first inverter provided in the embodiments of the present application;

[0038] Figure 5 Fig. 4 shows a circuit structure schematic diagram of a second inverter provided in the embodiments of the present application;

[0039] Figure 6 Fig. 5 shows a frequency-voltage relationship diagram corresponding to a VCO-odd oscillator module used by a voltage-controlled oscillator provided in the embodiments of the present application;

[0040] Figure 7 Fig. 6 shows a linear error diagram corresponding to a VCO-odd oscillator module used by a voltage-controlled oscillator provided in the embodiments of the present application;

[0041] Figure 8 Fig. 7 shows a frequency-voltage relationship diagram corresponding to a VCO-even oscillator module used by a voltage-controlled oscillator provided in the embodiments of the present application;

[0042] Figure 9 Fig. 8 shows a linear error diagram corresponding to a VCO-even oscillator module used by a voltage-controlled oscillator provided in the embodiments of the present application;

[0043] Figure 10 Fig. 9 shows a waveform schematic diagram of a voltage-controlled oscillator provided in the embodiments of the present application. DETAILED DESCRIPTION

[0044] The present application will be 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 those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0045] In the following description, "some embodiments" are described, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0046] In the description of the present application, it needs to be understood that the terms "length", "upper", "lower", "front", "back", "left", "right", "top", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the features defined as "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0047] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] A voltage-controlled oscillator (VCO) is an electronic oscillator whose output frequency can be controlled by an input voltage. In a circuit, a 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 loop, etc. The working principle of VCO is: by changing the capacitance or inductance value of the internal circuit to adjust the resonant frequency of the oscillator, and this change is controlled by the input voltage. When the input voltage increases, the oscillation frequency usually also increases; conversely, when the input voltage decreases, the oscillation frequency decreases. Therefore, the VCO can provide an output frequency proportional to the input voltage. VCO plays an important role in communication systems, such as generating radio frequency signals in wireless communication, 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. This kind of oscillator has two problems: first, the amplitude of oscillation changes greatly with the change of control voltage; second, if it is used as an analog-to-digital converter based on voltage-controlled oscillator, a sampling module cannot be directly connected at the control voltage, but a buffer must be added in the middle, which makes it inconvenient to use. Exemplarily, Figure 1 A circuit principle diagram of a voltage-controlled oscillator used in the related art is shown. ForFigure 1 The voltage-controlled oscillator shown, to achieve the sampling function of the 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 needed to drive the ring oscillator. Obviously, to achieve the function of sampling, a buffer must be needed between the sampling circuit and the ring oscillator. Such a buffer is not difficult to achieve in CMOS technology, but since only n-type TFT is used to implement the circuit, on the one hand, the buffer will be consumed by the n-type load tube by a threshold voltage, on the other hand, the buffer is also difficult to achieve ideal following characteristics. With the change of the control voltage, the amplitude of the oscillator waveform will also change very obviously, if the control voltage is low, it is possible to cause difficulty in identifying the oscillation waveform, thereby causing errors in the conversion process.

[0050] Therefore, the application provides a voltage-controlled oscillator and an electronic device. The voltage-controlled oscillator comprises a sampling module, a voltage lifting module and an oscillator module; the sampling module is connected to the voltage lifting module, the voltage lifting module is connected to the oscillator module; the sampling module is configured to input a clock signal and maintain a voltage unchanged during a low level of the clock signal; the voltage lifting module is configured to lift an input voltage signal; the oscillator module comprises a frequency control unit and an inverter chain, the frequency control unit is configured to control a frequency of oscillation and perform a phase transformation on a signal, and the inverter chain is configured to perform time delay and inversion on the signal, and the inverter chain comprises a plurality of inverters connected in sequence. The voltage-controlled oscillator does not need to use a power supply voltage as a control voltage, the oscillation amplitude is more stable, and the sampling application can be conveniently and efficiently implemented.

[0051] In the following, the application provides a voltage-controlled oscillator and an electronic device, which will be described in detail in combination with specific drawings.

[0052] Firstly, the voltage-controlled oscillator provided in the application is introduced and described.

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

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

[0055] The sampling module is configured to input a clock signal and maintain a voltage unchanged during a low level of the clock signal;

[0056] The voltage lifting module is configured to lift an input voltage signal;

[0057] The oscillator module comprises a frequency control unit for controlling the frequency of oscillation and providing a phase shift for a signal, and an inverter chain for providing a time delay and an inversion for the signal, and the inverter chain comprises a plurality of inverters connected in sequence.

[0058] In the embodiment of the present application, a low-power consumption voltage-controlled oscillator is provided, which specifically can comprise a sampling module, a voltage lifting module and an oscillator module. The sampling module is connected to the voltage lifting module, and the voltage lifting module is connected to the oscillator module. The sampling module is mainly used for inputting a clock signal, and keeping the voltage unchanged when the clock signal is at a low level. The voltage lifting module can lift the input voltage signal to a higher voltage, so that the frequency control unit of the oscillator can maintain sufficient on and off states, and 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 a time delay and an inversion for a signal, and the frequency control unit is used to control the frequency of oscillation and provide a phase shift for a signal. In the inverter chain, a plurality of inverters are connected in sequence. In the embodiment of the present application, the frequency control unit can be used to isolate the inverter chain and the sampling circuit, so as to avoid using the power supply voltage as the control voltage.

[0059] In the embodiment of the present application, the oscillator module specifically can comprise two kinds, which are respectively denoted as VCO-even and VCO-odd, and the number of inverters in the two kinds of oscillator modules and the phase shift provided by the frequency control unit are different.

[0060] Reference is made to Figure 2 , Figure 2 A circuit principle schematic diagram of a voltage-controlled oscillator provided in the embodiment of the present application is shown, and Figure 2 In the circuit shown in the figure, the oscillator module used is VCO-odd, which can be denoted as the first oscillator module 231. Reference is made to Figure 3 , Figure 3 A circuit principle schematic diagram of another voltage-controlled oscillator provided in the embodiment of the present application is shown, and Figure 3 In the circuit shown in the figure, the oscillator module used is VCO-even, which can be denoted as the second oscillator module 232. The specific circuit structure provided in the embodiment of the present application is introduced below in combination with Figure 2 and Figure 3 .

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

[0062] The drain of the fifth transistor M5 is connected to an input signal, the gate of the fifth transistor M5 is used to access a 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 lifting module 220.

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

[0064] Specifically, in some embodiments, the voltage lifting 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 and the source of the second transistor M2 are connected, 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 the embodiment of the application, the voltage lifting module 220 includes a first transistor M1 and a second transistor M2, and 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, it can lift the lower input voltage to a high voltage value, so as 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 number of the second inverters is greater than or equal to 7, each of the first inverters constitutes a first chain, each of the second inverters constitutes a second chain, the first chain and the second chain are connected, and the connection of 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 the power supply. The gate of the fourth transistor M4 is connected to the second chain.

[0069] In this embodiment of the application, the working principle of the oscillator module VCO-odd is as follows: assuming Figure 2 When Va is high, the second capacitor C2 charges, and Vb rises. When Vb reaches a high level, it triggers the inverter chain to flip, Va goes low, and the second capacitor C2 discharges, causing Vb to fall. When Vb falls low, it triggers the inverter chain to flip again, and Va goes high once more. This cycle repeats, generating oscillation. With proper design, the charging time of the second capacitor C2 and the delay of the inverter chain can be made much smaller than the discharging time. That is, the size of the charging transistor (i.e., the third transistor M3) can be much larger than that of the discharging transistor (i.e., the fourth transistor M4), and the second capacitor C2 can also be a large value. In this case, the oscillation period is approximately equal to the discharging time. The control voltage is connected to the gate of the discharging transistor, avoiding the need for a large current at the control voltage level, which would require an additional buffer, thus reducing 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 the first inverters forming a third chain, the third chain including the 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 even.

[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 the 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. 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 the VCO-odd, the VCO-odd uses two high-power second inverters, and the inverter chain needs an odd number of stages and at least 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) in the oscillation period, the voltages of the nodes thereof are just mirror images of the VCO-odd, the inverter chain is an even number of stages, and the high-power second inverter is not needed any more, only 6 first inverters are needed. The Va and Vb voltages change in the same direction, and the inversion function is realized by the frequency control unit, and the control voltage thereof is connected to the charging tube. Through testing, the power consumptions of the VCO-odd and the VCO-even are 134.3 uW and 71.5 uW respectively. It can be seen that the VCO-even effectively reduces the power consumption of the oscillator.

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

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

[0075] Specifically, referring to Figure 5 , Figure 5 A circuit structure schematic diagram of a second inverter provided in the embodiment of the present application is shown. Based on 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 an 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 connects the source of the twelfth transistor M12 and the gate of the fourteenth transistor M14, the gate and the drain of the twelfth transistor M12 are connected to a power supply; the drain of the thirteenth transistor M13 and the source of the fourteenth transistor M14 connect an 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, the input end of the voltage-controlled oscillator is connected with a voltage, CLK is set to high level, the frequency of the output is detected, and the corresponding frequency-voltage relationship graph and linear error graph under the two oscillator modules are obtained. Figure 6 is the corresponding frequency-voltage relationship graph of the voltage-controlled oscillator using the VCO-odd oscillator module, Figure 7 is the corresponding linear error graph of the voltage-controlled oscillator using the VCO-odd oscillator module; Figure 8 is the corresponding frequency-voltage relationship graph of the voltage-controlled oscillator using the VCO-even oscillator module, Figure 9 is the corresponding linear error graph 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. CLK is set to a 50Hz square wave, and the output is set to a 0.5Hz sine wave, the waveform of the voltage-controlled oscillator is collected, the waveforms under the two oscillator modules are similar, so one is given as an example, as shown in Figure 10 It can be seen that the waveform collected by the voltage-controlled oscillator is normal, thereby proving that the VCO can be connected with the sampling module 210 without a buffer, and the change of the oscillation amplitude is not obvious.

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

[0078] 1) The voltage lifting 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, so as to ensure the linearity of the oscillator, the third transistor M3 works in the linear region, so the control voltage Vctrl needs to be a relatively high voltage value, the use of the level lifting module can make the voltage at the input end be a relatively low value, which is convenient for processing general electrical signals.

[0079] 2) using the frequency control unit, the resistance of the third transistor M3 is changed to change the oscillation frequency, without using the power supply voltage as the control voltage, the frequency control unit controls the oscillation frequency, and at the same time, it plays the role of a buffer.

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

[0081] 4) The power consumption of the oscillator realized in the present application is relatively low, which is 134.3uW and 71.5uW respectively.

[0082] In the embodiments of the present application, an electronic device is also provided, which comprises the voltage-controlled oscillator described above.

[0083] It can be understood that the contents in the foregoing voltage-controlled oscillator embodiments are all applicable to the present electronic device embodiment, the function realized by the present electronic device embodiment is the same as that of the foregoing voltage-controlled oscillator embodiments, and the beneficial effects achieved by the present electronic device embodiment are also the same as those achieved by the foregoing voltage-controlled oscillator embodiments.

[0084] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

[0085] In the description of the present specification, the description of the terms "one embodiment", "another embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can 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 can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A voltage controlled oscillator characterized by, The sampling module, the voltage lifting module and the oscillator module are included. The sampling module is connected to the voltage lifting module, and the voltage lifting module is connected to the oscillator module. The sampling module is used for accessing a clock signal and maintaining a voltage unchanged during a period when the clock signal is at a low level. The voltage lifting module is used for lifting an input voltage signal. The oscillator module includes a frequency control unit and an inverter chain, the frequency control unit is used for controlling a frequency of oscillation and performing a phase transformation on a signal, and the inverter chain is used for performing time delay and inversion on the signal, and the inverter chain includes a plurality of inverters connected in sequence. The sampling module includes a first capacitor and a fifth transistor. The drain of the fifth transistor is connected to an input signal, the gate of the fifth transistor is used for accessing a clock signal, the source of the fifth transistor is grounded through the first capacitor, and the source of the fifth transistor is also connected to the voltage lifting module. The voltage lifting 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. 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 constitutes a third chain, the third chain includes an output port of a voltage-controlled oscillator, and the number of the first inverters on both sides of the output port of the voltage-controlled oscillator is even. 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 a first end of the third chain, a first end of the second capacitor and a drain of the fourth transistor, a second end of the third chain is connected to the gate of the fourth transistor, and the source of the fourth transistor and a second end of the second capacitor are grounded. The number of the first inverters is six.

2. A voltage controlled oscillator as claimed in claim 1, characterized in that Each transistor in the voltage-controlled oscillator is a unipolar thin film transistor.

3. A voltage controlled oscillator according to claim 1 or 2, c h a r a c t e r i z e d in that 4. The voltage-controlled oscillator of claim 1, wherein the first inverter includes 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 for connecting 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 the drain of the seventh transistor are connected to the source of the eighth transistor, and the gate and the 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 an output port of the first inverter, and the drain of the tenth transistor is connected to a power supply.

5. An electronic device, comprising: A voltage controlled oscillator comprising the voltage controlled oscillator of any one of claims 1-4.

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