Temperature controlled and temperature compensated oscillation device and method thereof

Abstract

The application discloses a temperature-controlled and temperature-compensated oscillation device and a method thereof. When an ambient temperature is in a first range between a first temperature and a second temperature higher than the first temperature, a voltage is provided to a frequency source to reduce a frequency variation of the frequency source caused by a variation of the ambient temperature. When the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, a heater is driven to a target temperature to adjust an operating temperature of the frequency source. The first temperature is higher than the third temperature.

Description

Technical Field

[0001] This invention relates to an oscillation device and related methods for temperature control and temperature compensation. Background Technology

[0002] Quartz resonators used in crystal oscillators exhibit a characteristic where their oscillation frequency changes significantly with temperature. Various techniques have been proposed to compensate for this variation and ensure high-precision, stable frequency characteristics. The conventionally known temperature-controlled crystal oscillator is one such technique.

[0003] These thermostatically controlled crystal oscillators compare an actual temperature with a set temperature, which is related to the outside air temperature measured by a temperature sensor. They control a heat source to reduce the difference between the two temperatures, thereby maintaining the temperature of the quartz resonator housed in a thermostatic oven (which serves as the enclosure) at the preset target temperature. Specifically, a thermostatically controlled crystal oscillator typically consists of a temperature sensor, a temperature setting unit with a preset target temperature, a comparator or, for example, a transistor control device, a heater as the heat source, and an oscillation circuit to drive the quartz resonator. This modular design integrates the module with the quartz resonator within the thermostatic oven. The temperature sensor, temperature setting unit, comparator, and heater are integrated into an integrated circuit (IC). When the actual temperature is low, the set temperature is high. However, excessively high set temperatures can degrade the IC's performance.

[0004] Therefore, in order to address the above-mentioned shortcomings, the present invention proposes a temperature control and temperature compensation oscillation device and method to solve the problems caused by the prior art. Summary of the Invention

[0005] This invention provides a temperature control and temperature compensation oscillation device and method, which avoids excessively high target temperatures from reducing the performance of integrated circuits.

[0006] In one embodiment of the present invention, an oscillation device is located in an environment with ambient temperature. The oscillation device includes a heater, a frequency source, a voltage-controlled oscillation circuit, and a temperature control circuit. The frequency of the frequency source is temperature-dependent on the ambient temperature, and the voltage-controlled oscillation circuit is coupled to the frequency source. When the ambient temperature is in a first range between a first temperature and a second temperature higher than the first temperature, the voltage-controlled oscillation circuit drives the frequency source to reduce the frequency change caused by the change in ambient temperature. The temperature control circuit is coupled to the heater and the voltage-controlled oscillation circuit. When the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, the temperature control circuit drives the heater to rise to a target temperature to adjust the operating temperature of the frequency source. The first temperature is higher than the third temperature.

[0007] In one embodiment of the present invention, an oscillation device is located in an environment with ambient temperature. The oscillation device includes a heater, a temperature control circuit, a frequency source, a first temperature sensor, and a voltage-controlled oscillation circuit. The temperature control circuit is coupled to the heater, and the frequency of the frequency source is temperature-dependent on the ambient temperature. When the ambient temperature is in a first range between a first temperature and a second temperature higher than the first temperature, the temperature control circuit drives the heater to a target temperature to adjust the operating temperature of the frequency source. The first temperature sensor is used to sense the ambient temperature. When the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, the first temperature sensor generates a first detection voltage based on the ambient temperature. The voltage-controlled oscillation circuit is coupled to the frequency source and the first temperature sensor. The voltage-controlled oscillation circuit receives the first detection voltage to drive the frequency source and reduce frequency changes of the frequency source caused by changes in ambient temperature. The third temperature is higher than the first temperature.

[0008] In one embodiment of the present invention, a temperature control and temperature compensation method is used for a frequency source, the frequency of which is temperature-dependent with respect to ambient temperature. The method includes the following steps: when the ambient temperature is in a first range between a first temperature and a second temperature higher than the first temperature, driving a heater to a target temperature to adjust the operating temperature of the frequency source; and when the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, providing a voltage to the frequency source to reduce frequency changes of the frequency source caused by changes in ambient temperature; wherein the third temperature is higher than the first temperature. Attached Figure Description

[0009] Figure 1 This is a circuit diagram of the oscillation device according to the first embodiment of the present invention.

[0010] Figure 2 This is a circuit diagram of the oscillation device according to the second embodiment of the present invention.

[0011] Figure 3 This is a circuit diagram of the oscillation device according to the third embodiment of the present invention.

[0012] Figures 4(a)-4(d) This is a schematic diagram showing the distribution of the first, second, third, and fourth temperatures in the first, second, and third embodiments of the present invention.

[0013] Figure 5 This is a circuit diagram of the oscillation device according to the fourth embodiment of the present invention.

[0014] Figures 6(a)-6(d) This is a schematic diagram showing the distribution of the first temperature, second temperature, third temperature and fourth temperature according to the fourth embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1-Oscillating device; 10-Heater; 11-Frequency source; 12-Voltage-controlled oscillator circuit; 121-Drive comparator; 122-Voltage generator; 123-Voltage-controlled variable capacitor; 13-Temperature control circuit; 131-Second temperature sensor; 132-Target temperature setting circuit; 133-Heating comparator; 14-First temperature sensor; 2-Oscillating device; 20-Heater; 21-Frequency source; 22-Voltage-controlled oscillator circuit; 221-Drive comparator; 222-Voltage generator; 223-Voltage-controlled variable capacitor; 23-Temperature control circuit; 231-Temperature sensor; 232-Target temperature setting circuit; 233-Heating comparator; 3-Oscillating device; 30-Heater; 31-Frequency source; 32-Voltage-controlled oscillator circuit; 322-Voltage generator; 323-Voltage-controlled variable capacitor; 33-Temperature control circuit; 331-Temperature sensor; 332-Target temperature setting circuit; 333-Comparator; 4-Oscillation device; 40-Heater; 41-Frequency source; 42-Voltage-controlled oscillator circuit; 422-Voltage generator; 423-Voltage-controlled variable capacitor; 43-Temperature control circuit; 431-Second temperature sensor; 432-Target temperature setting circuit; 433-Comparator; 44-First temperature sensor; D1-First detection voltage; C1-First control voltage; D2-Second detection voltage; C2-Second control voltage; DV-Drive voltage; OV-Operating voltage; C-Control voltage. Detailed Implementation

[0016] Embodiments of the present invention will be further explained below with reference to the accompanying drawings. Wherever possible, the same reference numerals in the drawings and description represent the same or similar components. In the drawings, shapes and thicknesses may be exaggerated for simplicity and convenience. It is understood that elements not specifically shown in the drawings or described in the description are forms known to those skilled in the art. Those skilled in the art can make various changes and modifications based on the content of this invention.

[0017] Unless otherwise specified, certain conditional clauses or words, such as "can," "could," "might," or "may," are generally intended to express features, elements, or steps that are present in the embodiments of this invention, but may also be interpreted as features, elements, or steps that may not be necessary. In other embodiments, these features, elements, or steps may not be necessary.

[0018] In the following description of "one embodiment" or "an embodiment," the term refers to a specific element, structure, or feature associated with at least one embodiment. Therefore, the multiple descriptions of "one embodiment" or "an embodiment" appearing in various places below do not refer to the same embodiment. Furthermore, specific components, structures, and features in one or more embodiments may be combined in a suitable manner.

[0019] Throughout this specification and claims, certain terms are used to refer to specific elements. Those skilled in the art will understand that electronic device manufacturers may use different names to refer to the same element. This document is not intended to distinguish between elements that have the same function but different names. In the following specification and claims, words such as "comprising" and "including" are open-ended terms and should therefore be interpreted as "containing but not limited to...". When the terms "comprising," "including," and / or "having" are used in this specification, they specify the presence of the stated features, areas, steps, operations, and / or elements, but do not exclude the presence or addition of one or more other features, areas, steps, operations, elements, and / or combinations thereof. When an element or layer is referred to as being "on" or "connected" to another element or layer, it may be directly on or directly connected to that other element or layer, or there may be an intervening element or layer between them, such as an electrical connection, wireless communication, optical communication, or other signal connection. Conversely, when a component is referred to as being "directly on" or "directly connected to" another component or layer, there is no intervening component or layer between them.

[0020] The following description provides a temperature-controlled and temperature-compensated oscillation device and method. In the oscillation device, when the ambient temperature is high, a voltage-controlled oscillator circuit drives a frequency source to reduce the frequency variation of the frequency source caused by changes in the ambient temperature, thereby avoiding excessively high target temperatures that could degrade the performance of the integrated circuit. The oscillation device described below can also be applied to other circuit architectures.

[0021] Figure 1 This is a circuit diagram of the oscillation device according to the first embodiment of the present invention. Please refer to [link / reference]. Figure 1The oscillation device 1 is located in an environment with ambient temperature. The oscillation device 1 includes a heater 10, a frequency source 11, a voltage-controlled oscillation circuit 12, and a temperature control circuit 13. The voltage-controlled oscillation circuit 12 and the temperature control circuit 13 can be implemented using integrated circuits. The frequency of the frequency source 11 is temperature-dependent on the ambient temperature. The voltage-controlled oscillation circuit 12 is coupled to the frequency source 11. When the ambient temperature is in a first range between a first temperature and a second temperature higher than the first temperature, the voltage-controlled oscillation circuit 12 drives the frequency source 11 to reduce the frequency change of the frequency source 11 caused by changes in the ambient temperature. The temperature control circuit 13 is coupled to the heater 10 and the voltage-controlled oscillation circuit 12. When the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, the temperature control circuit 13 drives the heater 10 to rise to a target temperature to adjust the operating temperature of the frequency source 11. The temperature control circuit 13 can transmit temperature information to the voltage-controlled oscillation circuit 12. The first temperature is higher than the third temperature. The target temperature has a correlation with the ambient temperature as a first-order polynomial, a higher-order polynomial, or a combination of first-order and higher-order polynomials.

[0022] In some embodiments of the present invention, the oscillation device 1 may further include a first temperature sensor 14 coupled to a voltage-controlled oscillator circuit 12. When the ambient temperature is within a first range, the first temperature sensor 14 senses the ambient temperature to generate a first detection voltage D1. When the ambient temperature is within the first range, the temperature control circuit 13 generates a first control voltage C1 based on the ambient temperature and the target temperature. The voltage-controlled oscillator circuit 12 receives the first control voltage C1 and the first detection voltage D1, and drives the frequency source 11 according to the first control voltage C1 and the first detection voltage D1.

[0023] In some embodiments of the present invention, the temperature control circuit 13 may include a second temperature sensor 131, a target temperature setting circuit 132, and a heating comparator 133. The second temperature sensor 131 senses the ambient temperature. When the ambient temperature is within a second range, the second temperature sensor 131 generates a second detection voltage D2 based on the ambient temperature. The target temperature setting circuit 132 senses the ambient temperature. When the ambient temperature is within the second range, the target temperature setting circuit 132 generates a second control voltage C2 based on the ambient temperature and the target temperature. When the ambient temperature is within a first range, the target temperature setting circuit 132 generates a first control voltage C1 based on the ambient temperature and the target temperature. The heating comparator 133 is coupled to the heater 10, the second temperature sensor 131, and the target temperature setting circuit 132. The heating comparator 133 receives the second detection voltage D2 and the second control voltage C2, and drives the heater 10 to the target temperature based on the second detection voltage D2 and the second control voltage C2.

[0024] In some embodiments of the present invention, the voltage-controlled oscillator circuit 12 may include a drive comparator 121, a voltage generator 122, and at least one voltage-controlled variable capacitor 123. The drive comparator 121 is coupled to a first temperature sensor 14 and a target temperature setting circuit 132. The drive comparator 121 receives a first control voltage C1 and a first detection voltage D1 to generate a drive voltage DV. The voltage generator 122 is coupled to the drive comparator 121 and receives the drive voltage DV, generating at least one operating voltage OV based on the drive voltage DV. The voltage-controlled variable capacitor 123 is coupled to a frequency source 11 and a voltage generator 122, and receives the operating voltage OV to adjust its capacitance value, thereby reducing frequency variations in the frequency source 11.

[0025] Figure 2 This is a circuit diagram of the oscillation device according to a second embodiment of the present invention. Please refer to [link / reference]. Figure 2 The oscillation device 2 is located in an environment with ambient temperature. The oscillation device 2 includes a heater 20, a frequency source 21, a voltage-controlled oscillation circuit 22, and a temperature control circuit 23. The voltage-controlled oscillation circuit 22 and the temperature control circuit 23 can be implemented using integrated circuits. The frequency of the frequency source 21 is temperature-dependent on the ambient temperature. The voltage-controlled oscillation circuit 22 is coupled to the frequency source 21. When the ambient temperature is in a first range between a first temperature and a second temperature higher than the first temperature, the voltage-controlled oscillation circuit 22 drives the frequency source 21 to reduce the frequency change of the frequency source 21 caused by changes in the ambient temperature. The temperature control circuit 23 is coupled to the heater 20 and the voltage-controlled oscillation circuit 22. When the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, the temperature control circuit 23 drives the heater 20 to rise to a target temperature to adjust the operating temperature of the frequency source 21. The temperature control circuit 23 can transmit temperature information to the voltage-controlled oscillation circuit 22. The first temperature is higher than the third temperature. When the ambient temperature is within a first range, the temperature control circuit 23 can sense the ambient temperature to generate a first detection voltage D1. When the ambient temperature is within the first range, the temperature control circuit 23 can generate a first control voltage C1 based on the ambient temperature and the target temperature. The voltage-controlled oscillator circuit 22 can receive the first control voltage C1 and the first detection voltage D1, and drive the frequency source 21 based on the first control voltage C1 and the first detection voltage D1. The target temperature has a correlation with the ambient temperature as a first-order polynomial, a higher-order polynomial, or a combination of first-order and higher-order polynomials.

[0026] In some embodiments of the present invention, the temperature control circuit 23 may include a temperature sensor 231, a target temperature setting circuit 232, and a heating comparator 233. The temperature sensor 231 senses the ambient temperature. When the ambient temperature is within a first range, the temperature sensor 231 generates a first detection voltage D1 based on the ambient temperature. When the ambient temperature is within a second range, the temperature sensor 231 generates a second detection voltage D2 based on the ambient temperature. The target temperature setting circuit 232 senses the ambient temperature. When the ambient temperature is within the first range, the target temperature setting circuit 232 generates a first control voltage C1 based on the ambient temperature and the target temperature. When the ambient temperature is within the second range, the target temperature setting circuit 232 generates a second control voltage C2 based on the ambient temperature and the target temperature. The heating comparator 233 is coupled to the heater 20, the temperature sensor 231, and the target temperature setting circuit 232. The heating comparator 233 receives the second detection voltage D2 and the second control voltage C2, and drives the heater 20 to the target temperature based on the second detection voltage D2 and the second control voltage C2.

[0027] In some embodiments of the present invention, the voltage-controlled oscillator circuit 22 may include a drive comparator 221, a voltage generator 222, and at least one voltage-controlled variable capacitor 223. The drive comparator 221 is coupled to a temperature sensor 231 and a target temperature setting circuit 232. The drive comparator 221 receives a first control voltage C1 and a first detection voltage D1 to generate a drive voltage DV. The voltage generator 222 is coupled to the drive comparator 221. The voltage generator 222 receives the drive voltage DV and generates at least one operating voltage OV based on the drive voltage DV. The voltage-controlled variable capacitor 223 is coupled to a frequency source 21 and a voltage generator 222. The voltage-controlled variable capacitor 223 receives the operating voltage OV to adjust its capacitance value, thereby reducing the frequency variation of the frequency source 21.

[0028] Figure 3 This is a circuit diagram of the oscillation device according to a third embodiment of the present invention. Please refer to [link / reference]. Figure 3The oscillation device 3 is located in an environment with ambient temperature. The oscillation device 3 includes a heater 30, a frequency source 31, a voltage-controlled oscillation circuit 32, and a temperature control circuit 33. The voltage-controlled oscillation circuit 32 and the temperature control circuit 33 can be implemented using integrated circuits. The frequency of the frequency source 31 is temperature-dependent on the ambient temperature. The voltage-controlled oscillation circuit 32 is coupled to the frequency source 31. When the ambient temperature is in a first range between a first temperature and a second temperature higher than the first temperature, the voltage-controlled oscillation circuit 32 drives the frequency source 31 to reduce the frequency change of the frequency source 31 caused by the change in ambient temperature. The temperature control circuit 33 is coupled to the heater 30 and the voltage-controlled oscillation circuit 32. When the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, the temperature control circuit 33 drives the heater 30 to rise to a target temperature to adjust the operating temperature of the frequency source 31. The temperature control circuit 33 can transmit temperature information to the voltage-controlled oscillation circuit 32. The first temperature is higher than the third temperature. The target temperature has a correlation with the ambient temperature using a first-order polynomial, a higher-order polynomial, or a combination of first-order and higher-order polynomials. When the ambient temperature is within a first range, the temperature control circuit 33 senses the ambient temperature to generate a first detection voltage D1. The voltage-controlled oscillator circuit 32 receives the first detection voltage D1 and drives the frequency source 31 according to the first detection voltage D1.

[0029] In some embodiments of the present invention, the temperature control circuit 33 may include a temperature sensor 331, a target temperature setting circuit 332, and a comparator 333. The temperature sensor 331 senses the ambient temperature. When the ambient temperature is within a first range, the temperature sensor 331 generates a first detection voltage D1 based on the ambient temperature. When the ambient temperature is within a second range, the temperature sensor 331 generates a second detection voltage D2 based on the ambient temperature. The target temperature setting circuit 332 senses the ambient temperature. When the ambient temperature is within the second range, the target temperature setting circuit 332 generates a control voltage C based on the ambient temperature and the target temperature. The comparator 333 is coupled to the heater 30, the temperature sensor 331, and the target temperature setting circuit 332. The comparator 333 receives the second detection voltage D2 and the control voltage C, and drives the heater 30 to the target temperature based on the second detection voltage D2 and the control voltage C.

[0030] In some embodiments of the present invention, the voltage-controlled oscillator circuit 32 may include a voltage generator 322 and at least one voltage-controlled variable capacitor 323. The voltage generator 322 is coupled to a temperature sensor 331 and is used to receive a first detected voltage D1 and generate at least one operating voltage OV based on the first detected voltage D1. The voltage-controlled variable capacitor 323 is coupled to a frequency source 31 and the voltage generator 322, and is used to receive the operating voltage OV to adjust its capacitance value, thereby reducing frequency variations in the frequency source 31.

[0031] Figures 4(a)-4(d) This is a schematic diagram showing the distribution of the first, second, third, and fourth temperatures in the first, second, and third embodiments of the present invention.

[0032] Figure 5 This is a circuit diagram of the oscillation device according to the fourth embodiment of the present invention. Figures 6(a)-6(d) This is a schematic diagram showing the distribution of the first, second, third, and fourth temperatures according to the fourth embodiment of the present invention. Please refer to [link / reference]. Figure 5 and Figures 6(a)-6(d) The oscillation device 4 is located in an environment with ambient temperature. The oscillation device 4 includes a heater 40, a frequency source 41, a voltage-controlled oscillation circuit 42, a temperature control circuit 43, and a first temperature sensor 44. The voltage-controlled oscillation circuit 42 and the temperature control circuit 43 can be implemented using integrated circuits. The temperature control circuit 43 is coupled to the heater 40, and the frequency of the frequency source 41 is temperature-dependent. When the ambient temperature is in a first range between a first temperature and a second temperature higher than the first temperature, the temperature control circuit 43 drives the heater 40 to a target temperature to adjust the operating temperature of the frequency source 41. The first temperature sensor 44 senses the ambient temperature. When the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, the first temperature sensor 44 generates a first detection voltage D1 based on the ambient temperature. The voltage-controlled oscillation circuit 42 is coupled to the frequency source 41 and the first temperature sensor 44. The voltage-controlled oscillation circuit 42 receives the first detection voltage D1 to drive the frequency source 41 and reduce frequency changes in the frequency source 41 caused by changes in ambient temperature. Furthermore, the third temperature is higher than the first temperature. The target temperature has a correlation with the ambient temperature as a first-order polynomial, a higher-order polynomial, or a combination of first-order and higher-order polynomials.

[0033] In some embodiments of the present invention, the temperature control circuit 43 may include a second temperature sensor 431, a target temperature setting circuit 432, and a comparator 433. The second temperature sensor 431 senses the ambient temperature. When the ambient temperature is within a first range, the second temperature sensor 431 generates a second detection voltage D2 based on the ambient temperature. The target temperature setting circuit 432 senses the ambient temperature. When the ambient temperature is within the first range, the target temperature setting circuit 432 generates a control voltage C based on the ambient temperature and the target temperature. The comparator 433 is coupled to the heater 40, the second temperature sensor 431, and the target temperature setting circuit 432. The comparator 433 receives the second detection voltage D2 and the control voltage C, and drives the heater 40 to the target temperature based on the second detection voltage D2 and the control voltage C.

[0034] In some embodiments of the present invention, the voltage-controlled oscillator circuit 42 may include a voltage generator 422 and at least one voltage-controlled variable capacitor 423. The voltage generator 422 is coupled to a first temperature sensor 44 and is used to receive a first detected voltage D1 and generate at least one operating voltage OV based on the first detected voltage D1. The voltage-controlled variable capacitor 423 is coupled to a frequency source 41 and the voltage generator 422, and receives the operating voltage OV to adjust its capacitance value, thereby reducing frequency variations in the frequency source 41.

[0035] According to the above embodiments, the oscillation device avoids excessively high target temperatures that could degrade the performance of the integrated circuit.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, all equivalent variations and modifications made in accordance with the shape, structure, features and spirit described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A temperature-controlled and temperature-compensated oscillation device, characterized in that, Located in an environment with ambient temperature, the oscillation device includes: A heater; A frequency source whose frequency is temperature-dependent on the ambient temperature; A voltage-controlled oscillator circuit coupled to the frequency source, wherein when the ambient temperature is within a first range between a first temperature and a second temperature higher than the first temperature, the voltage-controlled oscillator circuit drives the frequency source to reduce the frequency variation of the frequency source caused by changes in the ambient temperature; and A temperature control circuit is coupled to the heater and the voltage-controlled oscillator circuit, wherein when the ambient temperature is in a second range between a third temperature and a fourth temperature higher than the third temperature, the temperature control circuit drives the heater to rise to a target temperature to adjust the operating temperature of the frequency source. Wherein the first temperature is higher than the third temperature; The second temperature is higher than the fourth temperature; The temperature control circuit generates two voltages based on the ambient temperature, and transmits one of the voltages to the voltage-controlled oscillator circuit to drive the frequency source, and drives the heater in response to the other voltage.

2. The oscillation device as described in claim 1, characterized in that, It also includes a first temperature sensor coupled to the voltage-controlled oscillator circuit, wherein when the ambient temperature is within the first range, the first temperature sensor senses the ambient temperature to generate a first detection voltage; when the ambient temperature is within the first range, the temperature control circuit generates a first control voltage based on the ambient temperature and the target temperature; the voltage-controlled oscillator circuit receives the first control voltage and the first detection voltage, and drives the frequency source based on the first control voltage and the first detection voltage.

3. The oscillation device as described in claim 2, characterized in that, The temperature control circuit includes: A second temperature sensor is provided for sensing the ambient temperature, wherein when the ambient temperature is within the second range, the second temperature sensor generates a second detection voltage based on the ambient temperature; A target temperature setting circuit is configured to sense the ambient temperature, wherein when the ambient temperature is within a second range, the target temperature setting circuit generates a second control voltage based on the ambient temperature and the target temperature; and when the ambient temperature is within a first range, the target temperature setting circuit generates a first control voltage based on the ambient temperature and the target temperature. A heating comparator is coupled to the heater, the second temperature sensor and the target temperature setting circuit. The heating comparator is used to receive the second detection voltage and the second control voltage, and drive the heater to the target temperature according to the second detection voltage and the second control voltage.

4. The oscillation device as described in claim 3, characterized in that, The voltage-controlled oscillator circuit includes: A drive comparator is coupled to the first temperature sensor and the target temperature setting circuit. The drive comparator is used to receive the first control voltage and the first detection voltage to generate a drive voltage. A voltage generator coupled to the drive comparator, the voltage generator being configured to receive the drive voltage and generate at least one operating voltage based on the drive voltage; and At least one voltage-controlled variable capacitor coupled to the frequency source and the voltage generator, the at least one voltage-controlled variable capacitor being used to receive the at least one operating voltage to adjust the capacitance value, thereby reducing the frequency variation of the frequency source.

5. The oscillation device as described in claim 1, characterized in that, When the ambient temperature is within the first range, the temperature control circuit senses the ambient temperature to generate a first detection voltage. When the ambient temperature is within the first range, the temperature control circuit generates a first control voltage based on the ambient temperature and the target temperature. The voltage-controlled oscillator circuit receives the first control voltage and the first detection voltage, and drives the frequency source based on the first control voltage and the first detection voltage.

6. The oscillation device as described in claim 5, characterized in that, The temperature control circuit includes: A temperature sensor is used to sense the ambient temperature, wherein when the ambient temperature is within a first range, the temperature sensor generates a first detection voltage based on the ambient temperature, and when the ambient temperature is within a second range, the temperature sensor generates a second detection voltage based on the ambient temperature. A target temperature setting circuit is configured to sense the ambient temperature, wherein when the ambient temperature is within a first range, the target temperature setting circuit generates a first control voltage based on the ambient temperature and the target temperature; and when the ambient temperature is within a second range, the target temperature setting circuit generates a second control voltage based on the ambient temperature and the target temperature. A heating comparator is coupled to the heater, the temperature sensor and the target temperature setting circuit. The heating comparator is used to receive the second detection voltage and the second control voltage, and drive the heater to the target temperature according to the second detection voltage and the second control voltage.

7. The oscillation device as described in claim 6, characterized in that, The voltage-controlled oscillator circuit includes: A drive comparator is coupled to the temperature sensor and the target temperature setting circuit. The drive comparator is used to receive the first control voltage and the first detection voltage to generate a drive voltage. A voltage generator coupled to the drive comparator, the voltage generator being configured to receive the drive voltage and generate at least one operating voltage based on the drive voltage; and At least one voltage-controlled variable capacitor coupled to the frequency source and the voltage generator, the at least one voltage-controlled variable capacitor being used to receive the at least one operating voltage to adjust the capacitance value, thereby reducing the frequency variation of the frequency source.

8. The oscillation device as claimed in claim 1, characterized in that, When the ambient temperature is within the first range, the temperature control circuit senses the ambient temperature to generate a first detection voltage, and the voltage-controlled oscillator circuit receives the first detection voltage and drives the frequency source according to the first detection voltage.

9. The oscillation device as described in claim 8, characterized in that, The temperature control circuit includes: A temperature sensor is used to sense the ambient temperature, wherein when the ambient temperature is within a first range, the temperature sensor generates a first detection voltage based on the ambient temperature, and when the ambient temperature is within a second range, the temperature sensor generates a second detection voltage based on the ambient temperature. A target temperature setting circuit is used to sense the ambient temperature, wherein when the ambient temperature is within a second range, the target temperature setting circuit generates a control voltage based on the ambient temperature and the target temperature; and A comparator is coupled to the heater, the temperature sensor and the target temperature setting circuit. The comparator is used to receive the second detection voltage and the control voltage, and drive the heater to the target temperature according to the second detection voltage and the control voltage.

10. The oscillation device as claimed in claim 9, characterized in that, The voltage-controlled oscillator circuit includes: A voltage generator coupled to the temperature sensor, the voltage generator being configured to receive the first detected voltage and generate at least one operating voltage based on the first detected voltage; and At least one voltage-controlled variable capacitor coupled to the frequency source and the voltage generator, the at least one voltage-controlled variable capacitor being used to receive the at least one operating voltage to adjust the capacitance value, thereby reducing the frequency variation of the frequency source.

11. The oscillation device as claimed in claim 1, characterized in that, The target temperature has a correlation with the ambient temperature using a first-order polynomial, a higher-order polynomial, or a combination of first-order and higher-order polynomials.

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