Frequency selection circuit, phase-locked loop, chip, and electronic device

Abstract

The present invention provides a frequency selection circuit, a phase-locked loop, a chip, and an electronic device. The frequency selection circuit comprises: a voltage stabilization module, a temperature compensation module, a voltage-controlled oscillation module, a feedback frequency division module, and a frequency selection module; the voltage stabilization module is used for outputting a voltage stabilization signal on the basis of a control signal; the temperature compensation module is used for outputting a compensation voltage signal on the basis of the control signal and a real-time temperature; the voltage-controlled oscillation module is used for outputting a base frequency signal on the basis of the control signal, the voltage stabilization signal, and the compensation voltage signal; the feedback frequency division module is used for performing frequency division on the base frequency signal to obtain a frequency division signal; and the frequency selection module is used for adjusting the control signal on the basis of the frequency division signal and a pre-set frequency reference signal if the frequency division signal and the preset frequency reference signal are outside a preset error range. According to the present invention, a frequency deviation caused by an inductor and a capacitor at different temperatures is compensated by means of a temperature compensation circuit, thereby solving the problem of a certain frequency breakpoint occurring at different temperatures.

Description

Frequency selection circuits, phase-locked loops, chips and electronic equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on October 13, 2023, with application number 202311330813.2 and invention name “Frequency selection circuit, phase-locked loop, chip and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present invention relates to the field of electronic technology, and in particular to a frequency selection circuit, a phase-locked loop, a chip and an electronic device. Background Art

[0004] To meet diverse application requirements, high-speed interface chips require continuous improvement in output frequency coverage and clock quality. LC oscillators offer low-jitter output performance, and the use of capacitor arrays can improve output coverage to meet application requirements. Inductors are metal-based on-chip inductors, while capacitors are passive components. The inductance and capacitance values ​​vary at different temperatures, resulting in inconsistent frequency ranges at high temperatures. Because the entire frequency range is covered by different capacitor arrays, performance varies at high and low temperatures, leading to frequency breakpoints at different temperatures.

[0005] Summary of the Invention

[0006] The present invention provides a frequency selection circuit, a phase-locked loop, a chip and an electronic device, the main purpose of which is to solve the linearity of each capacitor array at different temperatures, optimize the jitter performance, and avoid the problem of a certain frequency breakpoint occurring at different temperatures.

[0007] In a first aspect, an embodiment of the present invention provides a frequency selection circuit, comprising a voltage stabilization module, a temperature compensation module, a voltage-controlled oscillation module, a feedback frequency division module, and a frequency selection module, wherein:

[0008] The voltage stabilization module is used to output a voltage stabilization signal according to the control signal;

[0009] The temperature compensation module is used to output a compensation voltage signal according to the control signal and the real-time temperature;

[0010] The voltage-controlled oscillation module is used to output a basic frequency signal according to the control signal, the voltage stabilization signal and the compensation voltage signal;

[0011] The feedback frequency division module is used to divide the basic frequency signal to obtain a frequency division signal;

[0012] The frequency selection module is configured to adjust the control signal according to the frequency-divided signal and a preset frequency reference signal if the frequency-divided signal and the preset frequency reference signal are outside a preset error range.

[0013] Furthermore, the compensation voltage signal is a positive compensation voltage signal or a negative compensation voltage signal, and the temperature compensation module includes a temperature sensing unit, a positive temperature compensation unit, and a negative temperature compensation unit, wherein:

[0014] The temperature sensing unit is used to output a temperature sensing voltage according to the real-time temperature;

[0015] The positive temperature compensation unit is used to output the positive compensation voltage signal according to the control signal and the temperature sensing voltage;

[0016] The negative temperature compensation unit is configured to output the negative compensation voltage signal according to the control signal and the temperature-sensing voltage.

[0017] Furthermore, the temperature sensing unit includes a first resistor and a transistor, wherein one end of the first resistor is used to connect to a power supply, the other end of the first resistor is connected to the emitter of the transistor, the base of the transistor and the collector of the transistor are both grounded, and the other end of the first resistor is used to output the temperature sensing voltage.

[0018] Furthermore, the positive temperature compensation unit includes a second resistor and a first power tube, wherein one end of the second resistor is used to connect to the power supply, the other end of the second resistor is connected to the source of the first power tube, the gate of the first power tube is connected to the emitter of the triode, and the drain of the first power tube is grounded;

[0019] The second resistor is configured to determine a resistance value according to the control signal, and output the positive compensation voltage signal at the other end of the second resistor.

[0020] Furthermore, the negative temperature compensation unit includes a second power tube, a third power tube, a fourth power tube and a third resistor, wherein:

[0021] The source of the second power tube and the source of the third power tube are both used to connect to the power supply, the gate of the second power tube is connected to the gate of the third power tube, the drain of the second power tube is connected to the drain of the fourth power tube, the gate of the fourth power tube is connected to the gate of the first power tube, the source of the fourth power tube is used to be grounded, the drain of the third power tube is connected to one end of the third resistor, and the other end of the third resistor is grounded;

[0022] The third resistor is used to determine a resistance value according to the control signal, and output the negative compensation voltage signal at one end of the third resistor.

[0023] Furthermore, the voltage-controlled oscillation module includes a coarse adjustment unit, a fine adjustment unit, and a first output unit, the coarse adjustment unit includes a capacitor array, and the fine adjustment unit includes an inductor and a capacitor, wherein:

[0024] The coarse adjustment unit is used to control the number of capacitors connected to the capacitor array according to the control signal;

[0025] The fine adjustment unit is used to perform voltage compensation on the capacitor according to the compensation voltage signal, and to compensate the inductor according to the regulated voltage signal;

[0026] The first output unit is configured to output the fundamental frequency signal according to the capacitor connected to the coarse adjustment unit, the compensated inductor, and the compensated capacitor.

[0027] Furthermore, the voltage stabilizing module includes a voltage dividing unit and a second output unit, and the voltage dividing unit includes a fourth resistor, wherein:

[0028] The voltage dividing unit is used to determine the resistance value of the fourth resistor according to the control signal and output a reference voltage;

[0029] The second output unit is configured to output the regulated voltage signal according to the reference voltage.

[0030] In a second aspect, an embodiment of the present invention provides a phase-locked loop, comprising a frequency selection circuit as provided in the first aspect.

[0031] In a third aspect, an embodiment of the present invention provides a chip, comprising a frequency selection circuit as provided in the first aspect, or a phase-locked loop as provided in the second aspect.

[0032] In a fourth aspect, an embodiment of the present invention provides an electronic device, comprising a frequency selection circuit as provided in the first aspect, or a phase-locked loop as provided in the second aspect, or a chip as provided in the third aspect.

[0033] The present invention proposes a frequency selection circuit, phase-locked loop, chip, and electronic device that compensate for frequency deviations caused by inductance and capacitance at different temperatures through a temperature compensation circuit, thereby improving the linearity of each capacitor array and optimizing jitter performance; and solving the problem of a certain frequency breakpoint occurring at different temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a schematic structural diagram of a frequency selection circuit provided by an embodiment of the present invention;

[0035] FIG2 is a circuit diagram of a temperature compensation module provided by an embodiment of the present invention;

[0036] FIG3 is a circuit diagram of a voltage-controlled oscillation module provided in an embodiment of the present invention;

[0037] FIG4 is a circuit diagram of a voltage stabilizing module provided in an embodiment of the present invention;

[0038] FIG5 is a schematic structural diagram of a phase-locked loop provided by an embodiment of the present invention.

[0039] Reference numerals:

[0040] 100, frequency selection circuit; 200, phase-locked loop;

[0041] 110, voltage stabilizing module; 120, temperature compensation module;

[0042] 130, voltage-controlled oscillator module; 140, feedback frequency division module;

[0043] 150, frequency selection module; 111, temperature sensing unit;

[0044] 112, positive temperature compensation unit; 113, negative temperature compensation unit;

[0045] 114, coarse adjustment unit; 115, fine adjustment unit;

[0046] 116, a first output unit; 117, a voltage dividing unit;

[0047] 118, second output unit; R1, first resistor;

[0048] R2, the second resistor; R3, the third resistor;

[0049] BJT, transistor; Q1, first power tube;

[0050] Q2, the second power tube; Q3, the third power tube;

[0051] Q4, the fourth power tube; R4, the fourth resistor.

[0052] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0053] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0054] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 those skilled in the art without making creative efforts are within the scope of protection of this application.

[0055] In the embodiments of the present application, at least one refers to one or more; a plurality refers to two or more. In the description of the present application, words such as "first", "second", and "third" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, the terms "including," "comprising," "having," and their variations in this specification all mean "including but not limited to," unless otherwise specifically stated.

[0057] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0058] An embodiment of the present invention provides a frequency selection circuit 100, as shown in FIG1 , which includes a voltage stabilization module 110, a temperature compensation module 120, a voltage-controlled oscillation module 130, a feedback frequency division module 140, and a frequency selection module 150, wherein:

[0059] The voltage stabilization module 110 is used to output a voltage stabilization signal according to the control signal;

[0060] The temperature compensation module 120 is used to output a compensation voltage signal according to the control signal and the real-time temperature;

[0061] The voltage-controlled oscillation module 130 is configured to output a fundamental frequency signal according to the control signal, the voltage stabilization signal, and the compensation voltage signal;

[0062] The feedback frequency division module 140 is used to divide the basic frequency signal to obtain a divided frequency signal;

[0063] The frequency selection module 150 is configured to adjust the control signal according to the frequency-divided signal and a preset frequency reference signal, if the frequency-divided signal and the preset frequency reference signal are outside a preset error range.

[0064] An embodiment of the present invention provides a frequency selection circuit 100, which includes a voltage stabilization module 110, a temperature compensation module 120, a voltage-controlled oscillation module 130, a feedback frequency division module 140, and a frequency selection module 150. The input ends of the voltage stabilization module 110 and the temperature compensation module 120 are both connected to the output end of the frequency selection module 150, the output end of the voltage stabilization module 110, the output end of the temperature compensation module 120, and the output end of the frequency selection module 150 are all connected to the input end of the voltage-controlled oscillation module 130, the output end of the voltage-controlled oscillation module 130 is connected to the input end of the feedback frequency division module 140, and the output end of the feedback frequency division module 140 is connected to the input end of the frequency selection module 150.

[0065] When the frequency selection circuit 100 is just powered on, the voltage stabilization module 110 receives a control signal, which is represented by B<4:0> in Figure 1, and outputs a voltage stabilization signal according to the default value of the control signal. The voltage stabilization signal is represented by VIdo in Figure 1, and the voltage stabilization signal is a voltage signal; the temperature compensation module 120 receives the control signal, performs compensation according to the default value of the control signal and the real-time temperature, uses the default value of the control signal to control the resistance value in the temperature compensation module 120, and uses a temperature sensor or other electronic components that change with temperature to output a corresponding compensation voltage signal, which is represented by Vtemp in Figure 1; after the voltage-controlled oscillator receives the control signal, the voltage stabilization signal and the compensation voltage signal, it starts the inductor and capacitor oscillation according to the default value of the control signal, the voltage stabilization signal and the compensation voltage signal, and outputs a basic frequency signal. In the embodiment of the present invention, the basic frequency signal is a high-frequency signal.

[0066] After receiving the base frequency signal, the feedback frequency division module 140 divides the base frequency signal to obtain a frequency division signal, which is converted from a high-frequency base frequency signal to a low-frequency frequency division signal. In FIG1 , the frequency division signal is represented by Fblck. After receiving the frequency division signal, the frequency selection module 150 compares the frequency division signal with a preset frequency reference signal. If the frequency division signal and the preset frequency reference signal are outside a preset error range, the frequency selection module 150 readjusts the control signal based on the difference between the frequency division signal and the preset frequency reference signal, and outputs the adjusted control signal. In FIG1 , the preset frequency reference signal is represented by Refclk. In the embodiment of the present invention, the preset frequency reference signal can be determined according to actual conditions, and the specific value is not specifically limited.

[0067] The voltage stabilization module 110 re-outputs the regulated voltage signal according to the adjusted control signal. Generally, the size of the output regulated voltage signal is different when the size of the control signal is different. The above process is repeated until the difference between the frequency-divided signal received by the frequency selection module 150 and the preset frequency reference signal is within the preset error range. Then, the size of the control signal is no longer adjusted, and the size of the control signal output by the frequency selection module 150 remains unchanged.

[0068] It should be noted that the control signal in the embodiments of the present invention is a digital signal, and its specific value can be determined based on actual conditions. In the embodiments of the present invention, the control signal is represented by a 4-bit binary number, and the control signal has a total of 16 possible values. The preset error range in the embodiments of the present invention can be determined based on actual conditions and is not specifically limited in the embodiments of the present invention.

[0069] In the embodiment of the present invention, the voltage stabilizing module 110, the temperature compensation module 120, the voltage-controlled oscillation module 130, the feedback frequency division module 140 and the frequency selection module 150 can be either analog circuits composed of resistors, switches and other components according to certain rules, or digital circuits composed of processors according to certain programming rules. The specific circuits can be determined according to actual conditions, and the embodiment of the present invention does not make specific limitations on this.

[0070] The frequency selection circuit 100 proposed by the present invention compensates for the frequency deviation caused by inductance and capacitance at different temperatures through a temperature compensation circuit, thereby improving the linearity of each capacitor array and optimizing the jitter performance; and solves the problem of a certain frequency breakpoint appearing at different temperatures.

[0071] In some embodiments, the compensation voltage signal is a positive compensation voltage signal or a negative compensation voltage signal, and the temperature compensation module 120 includes a temperature sensing unit 111, a positive temperature compensation unit 112, and a negative temperature compensation unit 113, wherein:

[0072] The temperature sensing unit 111 is used to output a temperature sensing voltage according to the real-time temperature;

[0073] The positive temperature compensation unit 112 is configured to output the positive compensation voltage signal according to the control signal and the temperature sensing voltage;

[0074] The negative temperature compensation unit 113 is configured to output the negative compensation voltage signal according to the control signal and the temperature-sensing voltage.

[0075] In the embodiment of the present invention, the temperature compensation module 120 can increase or decrease its voltage as the temperature increases. When the voltage increases with temperature, the compensation voltage signal is a positive compensation voltage signal; when the voltage decreases with temperature, the compensation voltage signal is a negative compensation voltage signal. In actual implementation, whether to use positive or negative compensation can be determined based on actual conditions. In the embodiment of the present invention, both positive and negative temperature compensation are implemented, and can be controlled by adjusting the configuration point control signal B<4:0>.

[0076] Accordingly, the temperature compensation module 120 in the embodiment of the present invention includes a temperature sensing unit 111, a positive temperature compensation unit 112 and a negative temperature compensation unit 113, wherein the temperature sensing unit 111 is used to adjust the resistance value of the corresponding component according to the real-time temperature, and output a temperature sensing voltage according to the adjusted resistance value; the positive temperature compensation unit 112 outputs a positive compensation voltage signal based on the temperature sensing voltage according to the control signal; and the negative temperature compensation unit 113 outputs a negative compensation voltage signal based on the temperature sensing voltage according to the control signal.

[0077] As an embodiment, an embodiment of the present invention provides a temperature compensation module 120, as shown in Figure 2, the temperature sensing unit 111 includes a first resistor R1 and a transistor BJT, wherein one end of the first resistor R1 is used to connect to a power supply, the other end of the first resistor R1 is connected to the emitter of the transistor BJT, and the base of the transistor BJT and the collector of the transistor BJT are both grounded.

[0078] Specifically, the positive temperature compensation unit 112 includes a second resistor R2 and a first power tube Q1, wherein one end of the second resistor R2 is used to connect to the power supply, the other end of the second resistor R2 is connected to the source of the first power tube Q1, the gate of the first power tube Q1 is connected to the emitter of the triode BJT, and the drain of the first power tube Q1 is grounded;

[0079] The second resistor R2 is configured to determine a resistance value according to the control signal, and output the positive compensation voltage signal at the other end of the second resistor R2.

[0080] Specifically, the negative temperature compensation unit 113 includes a second power tube Q2, a third power tube Q3, a fourth power tube Q4 and a third resistor R3, wherein:

[0081] The source of the second power tube Q2 and the source of the third power tube Q3 are both used to connect to the power supply, the gate of the second power tube Q2 is connected to the gate of the third power tube Q3, the drain of the second power tube Q2 is connected to the drain of the fourth power tube Q4, the gate of the fourth power tube Q4 is connected to the gate of the first power tube Q1, the source of the fourth power tube Q4 is used to be grounded, the drain of the third power tube Q3 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is grounded;

[0082] The third resistor R3 is configured to determine a resistance value according to the control signal, and output the negative compensation voltage signal at one end of the third resistor R3.

[0083] In the embodiment of the present invention, the temperature sensing unit 111 includes a first resistor R1 and a transistor BJT. The connection method of the first resistor R1 and the transistor BJT is shown in Figure 2. The base and collector of the transistor BJT are both grounded. This connection method is equivalent to a diode. The temperature will affect the size of the PN junction in the transistor BJT. The voltage at the emitter of the transistor BJT is the temperature sensing voltage, thereby changing the size of the temperature sensing voltage and realizing that the temperature sensing voltage changes with temperature.

[0084] In the embodiment of the present invention, the positive temperature compensation unit 112 includes a second resistor R2 and a first power tube Q1. The connection method of the second resistor R2 and the first power tube Q1 is specifically shown in Figure 2. The second resistor R2 is a variable resistor, and its value is determined according to the magnitude of the control signal. After the second resistor R2 is determined, the second resistor R2 outputs a positive compensation voltage signal under the action of the temperature-sensing voltage. The positive compensation voltage signal is represented by vp in Figure 2.

[0085] It should be noted that the first power tube Q1 is a PMOS tube.

[0086] In the embodiment of the present invention, the negative temperature compensation voltage includes a second power tube Q2, a third power tube Q3, a fourth power tube Q4 and a third resistor R3. The connection method thereof is shown in FIG2. The third resistor R3 is also a variable resistor, and its resistance value can be determined according to the magnitude of the control signal. The third resistor R3 outputs a negative compensation voltage signal under the action of the temperature-sensing voltage. The negative compensation voltage signal is represented by vn in the figure.

[0087] It should be noted that the second power tube Q2 and the third power tube Q3 are both PMOS tubes, and the fourth power tube Q4 is an NMOS tube.

[0088] In the embodiment of the present invention, the compensation voltage signal is controlled by a switch SW. When the compensation voltage signal is connected to the positive compensation voltage signal, the compensation signal is a positive compensation voltage signal. When the compensation voltage signal is connected to the negative compensation voltage signal, the compensation signal is a negative compensation voltage signal.

[0089] In some embodiments, an embodiment of the present invention provides a voltage-controlled oscillator module 130, as shown in FIG3 . The voltage-controlled oscillator module 130 includes a coarse adjustment unit 114, a fine adjustment unit 115, and a first output unit 116. The coarse adjustment unit 114 includes a capacitor array, and the fine adjustment unit 115 includes an inductor and a capacitor, wherein:

[0090] The coarse adjustment unit 114 is used to control the number of capacitors connected to the capacitor array according to the control signal;

[0091] The fine adjustment unit 115 is used to perform voltage compensation on the capacitor according to the compensation voltage signal, and to compensate the inductor according to the regulated voltage signal;

[0092] The first output unit 116 is configured to output the fundamental frequency signal according to the capacitor, compensated inductor, and compensated capacitor connected to the coarse adjustment unit 114 .

[0093] The coarse adjustment unit 114 includes a capacitor array, which includes a number of capacitors. The specific number can be determined according to actual conditions. The coarse adjustment unit 114 determines the number of capacitors in the capacitor array connected to the voltage-controlled oscillation module 130 according to the specific value of the control signal. The more capacitors connected, the lower the frequency. C0 and C1 are controlled by variable capacitors. Capacitor C1 achieves frequency change by adjusting Vctrl in the phase-locked loop 200 loop, while capacitor C0 achieves frequency change by adjusting the voltage Vtemp using a temperature compensation circuit.

[0094] It should be noted that Vctrl is an external voltage, and capacitor C0 and capacitor C1 are both variable capacitors.

[0095] In an embodiment of the present invention, the coarse adjustment unit 114 includes a capacitor array C2, which determines the number of capacitors connected to the circuit according to the size of the control signal B<4:0>, including the inductor L, capacitor C0, capacitor C1, power transistor M0, and power transistor M1. The inductor L adjusts its inductance value according to the voltage regulation signal VIdo, and the capacitor C0 adjusts its capacitance value according to the compensation voltage signal Vtemp, thereby completing fine adjustment of the inductance and capacitance values.

[0096] In some embodiments, an embodiment of the present invention provides a voltage stabilizing module 110, as shown in FIG4 , wherein the voltage stabilizing module 110 includes a voltage dividing unit 117 and a second output unit 118 , wherein the voltage dividing unit 117 includes a fourth resistor R4 , wherein:

[0097] The voltage dividing unit 117 is used to determine the resistance value of the fourth resistor R4 according to the control signal and output a reference voltage;

[0098] The second output unit 118 is configured to output the regulated voltage signal according to the reference voltage.

[0099] An embodiment of the present invention provides a voltage stabilizing module 110, which includes a voltage dividing unit 117 and a second output unit 118. The voltage dividing unit 117 includes a current source and a fourth resistor R4. The resistance value of the fourth resistor R4 is determined according to the magnitude of the control signal, and the reference voltage is output. The reference voltage is represented by Vref in Figure 4; the second output unit 118 includes an operational amplifier OP, a power tube M3 and a resistor R5. The resistor R5 is a fixed resistor and the power tube M3 is an NMOS tube.

[0100] For example, in the embodiment of the present invention, the voltage stabilizing module 110 may be a low-dropout linear regulator. When the voltage-controlled oscillator module 130 operates at any control signal value, such as control signal B<4:0>=5b'10000, the voltage deviation of the stabilizing signal Vldo at high and low temperatures causes the variable ranges of the variable capacitors C0 and C1 to change. In addition, the inductance of the on-chip inductor L and the capacitance of the capacitor C will change with high and low temperatures. As a result, under the same control signal value, the frequency ranges at high and low temperatures are different.

[0101] The linearity of each capacitor array at different temperatures is relatively poor, and the jitter performance varies with temperature; in severe cases, a certain frequency breakpoint may appear at different temperatures.

[0102] An embodiment of the present invention provides a frequency selection circuit 100 for compensating for differences in frequency ranges at high and low temperatures. By adjusting the voltage-stabilizing signal Vldo, the specific value of the voltage-stabilizing signal Vldo is made substantially consistent at high and low temperatures. Then, through the temperature compensation module 120, the differences in the inductance of the on-chip inductor L and the capacitances of the capacitors C0 and C1 caused by high and low temperatures are compensated. Due to different processes, the differences may be positive or negative, so a temperature compensation circuit that can achieve positive and negative temperature coefficients is used to cover the differences, so that the frequency ranges at high and low temperatures are substantially consistent.

[0103] An embodiment of the present invention provides a phase-locked loop 200, as shown in FIG5 . The phase-locked loop 200 includes the frequency selection circuit 100 shown above.

[0104] Because the entire frequency range of the phase-locked loop 200 is composed of different control signal values, covered by B<4:0>, the frequency selection circuit 100 loop selects a B<4:0> value, which is then provided to the temperature compensation module 120 and the voltage regulation module 110. Compensation is adjusted proportionally to cover the entire frequency range of the phase-locked loop 200. This improves the linearity of each capacitor array at different temperatures, optimizes jitter performance, and solves the problem of frequency breakpoints occurring at different temperatures.

[0105] An embodiment of the present invention further provides a chip, which includes the frequency selection circuit 100 described above, or the phase-locked loop 200 described above. The chip (Integrated Circuit, IC) can be, but is not limited to, a SOC (System on Chip) chip or a SIP (System in Package) chip.

[0106] An embodiment of the present invention provides a structure of an electronic device, which includes a device body and a frequency selection circuit 100, a phase-locked loop 200, or a chip as described above, disposed within the device body. The electronic device may be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a mobile power supply, a wireless charger, a fast charger, a car charger, an adapter, a display, a USB (Universal Serial Bus) docking station, a stylus, a true wireless headset, a car central console, a car, a smart wearable device, a mobile terminal, or a smart home device. Smart wearable devices include, but are not limited to, smart watches, smart bracelets, and cervical massagers. Mobile terminals include, but are not limited to, smartphones, laptops, tablet computers, and POS (Point of Sales Terminal) machines. Smart home devices include, but are not limited to, smart sockets, smart rice cookers, smart sweepers, and smart lights.

[0107] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0108] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A frequency selection circuit, characterized in that: It includes a voltage stabilization module, a temperature compensation module, a voltage-controlled oscillation module, a feedback frequency division module and a frequency selection module, among which: The voltage stabilization module is used to output a voltage stabilization signal according to the control signal; The temperature compensation module is used to output a compensation voltage signal according to the control signal and the real-time temperature; The voltage-controlled oscillation module is used to output a basic frequency signal according to the control signal, the voltage stabilization signal and the compensation voltage signal; The feedback frequency division module is used to divide the basic frequency signal to obtain a frequency division signal; The frequency selection module is used to adjust the control signal according to the frequency division signal and the preset frequency reference signal if the frequency division signal and the preset frequency reference signal are outside a preset error range.

2. The frequency selection circuit according to claim 1, characterized in that: The compensation voltage signal is a positive compensation voltage signal or a negative compensation voltage signal, and the temperature compensation module includes a temperature sensing unit, a positive temperature compensation unit and a negative temperature compensation unit, wherein: The temperature sensing unit is used to output a temperature sensing voltage according to the real-time temperature; The positive temperature compensation unit is used to output the positive compensation voltage signal according to the control signal and the temperature sensing voltage; The negative temperature compensation unit is used to output the negative compensation voltage signal according to the control signal and the temperature sensing voltage.

3. The frequency selection circuit according to claim 1, characterized in that: The temperature sensing unit includes a first resistor and a transistor, wherein one end of the first resistor is used to connect to a power supply, the other end of the first resistor is connected to the emitter of the transistor, the base of the transistor and the collector of the transistor are both grounded, and the other end of the first resistor is used to output the temperature sensing voltage.

4. The frequency selection circuit according to claim 3, characterized in that: The positive temperature compensation unit includes a second resistor and a first power tube, wherein one end of the second resistor is used to connect to the power supply, the other end of the second resistor is connected to the source of the first power tube, the gate of the first power tube is connected to the emitter of the triode, and the drain of the first power tube is grounded; The second resistor is used to determine a resistance value according to the control signal, and output the positive compensation voltage signal at the other end of the second resistor.

5. The frequency selection circuit according to claim 4, characterized in that: The negative temperature compensation unit includes a second power tube, a third power tube, a fourth power tube and a third resistor, wherein: The source of the second power tube and the source of the third power tube are both used to connect to the power supply, the gate of the second power tube is connected to the gate of the third power tube, the drain of the second power tube is connected to the drain of the fourth power tube, the gate of the fourth power tube is connected to the gate of the first power tube, the source of the fourth power tube is used to be grounded, the drain of the third power tube is connected to one end of the third resistor, and the other end of the third resistor is grounded; The third resistor is used to determine a resistance value according to the control signal, and output the negative compensation voltage signal at one end of the third resistor.

6. The frequency selection circuit according to any one of claims 1 to 5, characterized in that: The voltage-controlled oscillation module includes a coarse adjustment unit, a fine adjustment unit and a first output unit, the coarse adjustment unit includes a capacitor array, and the fine adjustment unit includes an inductor and a capacitor, wherein: The coarse adjustment unit is used to control the number of capacitors connected to the capacitor array according to the control signal; The fine adjustment unit is used to perform voltage compensation on the capacitor according to the compensation voltage signal, and to compensate the inductor according to the voltage stabilization signal; The first output unit is used to output the basic frequency signal according to the capacitor connected to the coarse adjustment unit, the compensated inductor and the compensated capacitor.

7. The frequency selection circuit according to any one of claims 1 to 5, characterized in that: The voltage stabilizing module includes a voltage dividing unit and a second output unit, and the voltage dividing unit includes a fourth resistor, wherein: The voltage dividing unit is used to determine the resistance value of the fourth resistor according to the control signal and output a reference voltage; The second output unit is used to output the voltage-stabilized signal according to the reference voltage.

8. A phase-locked loop, characterized in that: It comprises the frequency selection circuit as claimed in any one of claims 1 to 7.

9. A chip, characterized in that: It comprises the frequency selection circuit as claimed in any one of claims 1 to 7, or the phase-locked loop as claimed in claim 8.

10. An electronic device, characterized in that: include: The frequency selection circuit as claimed in any one of claims 1 to 7; or, a phase-locked loop as claimed in claim 8; Or, the chip as claimed in claim 9.

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