A detection circuit and device for a temperature compensated crystal oscillator

Abstract

The utility model discloses a detection circuit and device of temperature compensation crystal oscillator, and the detection circuit includes first branch, second branch, first switch module and control module, first branch and second branch connect the output of temperature compensation crystal oscillator, first switch module's first input is connected with first branch, and first switch module's second input is connected with second branch, and first switch module's output is connected with control module, and first switch module switches control module and is connected with temperature compensation crystal oscillator through first branch or second branch, and first branch provides the load for temperature compensation crystal oscillator, and the load capacitance characteristic of first switch module is cut off and is used to temperature compensation crystal oscillator, and second branch communicates and connects control module and temperature compensation crystal oscillator, and the technical scheme provided by this embodiment has effectively suppressed the load characteristic of first switch module, has improved the anti -interference ability, has improved the accuracy of detection result.

Description

Technical Field

[0001] This utility model relates to the field of temperature-compensated crystal oscillators, and in particular to a detection circuit and device for a temperature-compensated crystal oscillator. Background Technology

[0002] Temperature-compensated crystal oscillators (TCXOs) use internal temperature compensation circuits to correct the frequency of the crystal oscillator, maintaining it within a stable frequency range. Due to their high frequency accuracy and stability, excellent performance-price ratio, low power consumption, small size, and strong environmental adaptability, they are widely used in various fields.

[0003] In mass production and user-end unit testing, output frequency is one of the most important indicators of temperature-compensated crystal oscillators. Existing frequency testing systems generally use high-speed switching to make corresponding function switching, but this introduces the load characteristics of high-speed switches. In particular, the equivalent resistance and equivalent capacitance of high-speed switches are generally large, and if applied to high-temperature environments, their load characteristics will be further deteriorated, seriously affecting the output frequency of the temperature-compensated crystal oscillator and resulting in large errors in the output frequency detection results. Utility Model Content

[0004] This invention provides a detection circuit and device for a temperature-compensated crystal oscillator to solve the problem that existing frequency detection circuits cause significant interference to the output frequency of the temperature-compensated crystal oscillator, resulting in poor output frequency detection results.

[0005] According to one aspect of the present invention, a detection circuit for a temperature-compensated crystal oscillator is provided, comprising: a first branch, a second branch, a first switching module, and a control module;

[0006] The first branch and the second branch are used to connect to the output terminal of the temperature-compensated crystal oscillator;

[0007] The first input terminal of the first switch module is connected to the first branch, the second input terminal of the first switch module is connected to the second branch, and the output terminal of the first switch module is connected to the control module. The first switch module is used to switch the control module to be connected to the temperature-compensated crystal oscillator through the first branch or the second branch.

[0008] The first branch is used to provide a load for the temperature-compensated crystal oscillator and to isolate the load capacitance characteristics of the first switching module from acting on the temperature-compensated crystal oscillator; the second branch is used to connect the control module and the temperature-compensated crystal oscillator for communication.

[0009] Optionally, the communication speed of the second branch is greater than that of the first branch.

[0010] Optionally, the first branch includes: an isolation module and an impedance module;

[0011] The first end of the isolation module is connected to the output end of the temperature-compensated crystal oscillator, and the second end of the isolation module is connected to the first input end of the first switch module. The isolation module is used to isolate the load capacitance characteristics of the first switch module from acting on the temperature-compensated crystal oscillator.

[0012] The first end of the impedance module is connected to the second end of the isolation module, and the second end of the impedance module is grounded. The impedance module, together with the isolation module, provides a load for the temperature-compensated crystal oscillator.

[0013] Optionally, the isolation module includes a first resistor, and the impedance module includes a second resistor;

[0014] The resistance of the first resistor is less than the resistance of the second resistor.

[0015] Optionally, both the first resistor and the second resistor are adjustable resistors.

[0016] Optionally, the second branch includes: a high-speed buffer module;

[0017] The first end of the high-speed buffer module is connected to the output end of the temperature-compensated crystal oscillator, and the second end of the high-speed buffer module is connected to the second input end of the first switch module; the high-speed buffer module is used to connect the control module and the temperature-compensated crystal oscillator for communication and to enhance the transmission speed of the output signal of the temperature-compensated crystal oscillator.

[0018] Optionally, the high-speed buffer module includes a high-speed buffer with an enable pin or a tri-state buffer.

[0019] Optionally, the detection circuit of the temperature-compensated crystal oscillator further includes: a capacitive reactance module;

[0020] The first terminal of the capacitive reactance module is connected to the output terminal of the temperature-compensated crystal oscillator, and the second terminal of the capacitive reactance module is grounded.

[0021] Optionally, the detection circuit of the temperature-compensated crystal oscillator further includes: a second switching module;

[0022] The output terminal of the second switch module is connected to the control terminal of the temperature-compensated crystal oscillator, the first input terminal of the second switch module is connected to the control signal, and the second input terminal of the second switch module is connected to the clock signal.

[0023] According to another aspect of the present invention, a detection device for a temperature-compensated crystal oscillator is provided, comprising: a detection circuit for the temperature-compensated crystal oscillator as described above.

[0024] The technical solution of this utility model embodiment realizes the communication function between the control module and the temperature-compensated crystal oscillator through the first branch. The output frequency detection function is realized through the second branch. The first branch provides a load for the temperature-compensated crystal oscillator on the one hand, and on the other hand, isolates the influence of the load characteristics of the first switching module on the detection result. Since the first branch provides a load for the temperature-compensated crystal oscillator, the temperature-compensated crystal oscillator has sufficient load resistance to operate normally. On the other hand, by setting up the first branch, the first switching module and the temperature-compensated crystal oscillator are effectively isolated, so that the load capacitance characteristics of the first switching module do not directly affect the temperature-compensated crystal oscillator. When the load capacitance characteristics of the first switching module act on the temperature-compensated crystal oscillator, it will cause fluctuations in the output frequency of the temperature-compensated crystal oscillator. By setting up the first branch to provide a load for the temperature-compensated crystal oscillator and isolating the first switching module and the temperature-compensated crystal oscillator through the first branch, the load capacitance characteristics of the first switching module are effectively blocked, improving the anti-interference capability of the temperature-compensated crystal oscillator, ensuring that the temperature-compensated crystal oscillator operates in a better detection environment, and improving the stability of the output frequency of the temperature-compensated crystal oscillator. This configuration improves the accuracy of the temperature-compensated crystal oscillator's output frequency detection by the detection circuit of the temperature-compensated crystal oscillator provided in this embodiment, thus enhancing the accuracy of the temperature-compensated crystal oscillator's output frequency detection.

[0025] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the detection circuit of a temperature-compensated crystal oscillator provided in an embodiment of this utility model;

[0028] Figure 2 A schematic diagram of the detection circuit of another temperature-compensated crystal oscillator provided in this embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the detection circuit of another temperature-compensated crystal oscillator provided in this embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the detection circuit of another temperature-compensated crystal oscillator provided in this embodiment of the present invention. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] As described in the background section, the equivalent resistance and equivalent capacitance parameters of the high-speed switches in existing frequency detection circuits are relatively large. This introduces the influence of the load capacitance characteristics of the high-speed switches into the frequency detection circuit. The load of the high-speed switches shifts at different temperatures, and the load capacitance characteristics deteriorate further, especially in high-temperature environments. When the temperature-compensated crystal oscillator is at different temperatures, the load capacitance characteristics of the high-speed switch 1 affect the output frequency of the temperature-compensated crystal oscillator 2 during detection, ultimately impacting the detection results.

[0034] To solve the above-mentioned technical problems, this utility model provides a detection circuit for a temperature-compensated crystal oscillator. Figure 1 This is a schematic diagram of the detection circuit for a temperature-compensated crystal oscillator provided in an embodiment of the present invention. See also... Figure 1The detection circuit 100 of the temperature-compensated crystal oscillator includes: a first branch 10, a second branch 20, a first switch module 30, and a control module 40; the first branch 10 and the second branch 20 are used to connect to the output terminal of the temperature-compensated crystal oscillator 200; the first input terminal of the first switch module 30 is connected to the first branch 10, the second input terminal of the first switch module 30 is connected to the second branch 20, and the output terminal of the first switch module 30 is connected to the control module 40; the first switch module 30 is used to switch the control module 40 to connect to the temperature-compensated crystal oscillator 200 through the first branch 10 or the second branch 20; the first branch 10 is used to provide a load for the temperature-compensated crystal oscillator 200 and to isolate the load capacitance characteristic of the first switch module 30 from acting on the temperature-compensated crystal oscillator; the second branch 20 is used to connect the control module 40 and the temperature-compensated crystal oscillator 200 for communication.

[0035] Specifically, in this embodiment of the invention, the first branch 10 of the detection circuit 200 of the temperature-compensated crystal oscillator is connected to the output terminal of the detection circuit 200 and the first input terminal of the first switching module 30, respectively. The first branch 10 is a circuit with a certain impedance; for example, the first branch 10 may include at least one resistor. On one hand, the first branch 10 provides a load for the detection circuit 200 of the temperature-compensated crystal oscillator. On the other hand, the first branch 10 can also isolate the load capacitance characteristic of the first switching module 30. The second branch 20 is connected to the output terminal of the detection circuit 200 and the second input terminal of the first switching module 30, respectively. The second branch 20 is a circuit that can improve the signal transmission speed of the temperature-compensated crystal oscillator 200; for example, the second branch 20 may include a buffer. The output terminal of the first switching module 30 is connected to the control module 40. The first switching module 30 is a switch with switching and selection branches; for example, the first switching module 30 may include a single-pole double-throw switch. The second branch 20 is used to connect the detection circuit 200 of the temperature-compensated crystal oscillator to the control module 40 during frequency detection. The first switch module 30 is used to switch the connection between the control module 40 and the detection circuit 200 of the temperature-compensated crystal oscillator via the first branch 10 or the second branch 20. The control module 40 performs output frequency detection of the temperature-compensated crystal oscillator 200 through the second branch 20, and also performs communication with the temperature-compensated crystal oscillator 200 through the first branch 10.

[0036] If the first switch module 30 switches to a connection between the control module 40 and the detection circuit 200 of the temperature-compensated crystal oscillator via the first branch 10, then the control module 40 and the detection circuit 200 of the temperature-compensated crystal oscillator communicate via the first branch 10. If the first switch module 30 switches to a connection between the control module 40 and the detection circuit 200 of the temperature-compensated crystal oscillator via the second branch 20, then the control module 40 detects the output frequency of the temperature-compensated crystal oscillator 200 via the second branch 20. The first branch 10 provides a load for the detection circuit 200 of the temperature-compensated crystal oscillator on one hand, and on the other hand, isolates the influence of the load capacitance characteristics of the first switch module 30 on the detection circuit 200 of the temperature-compensated crystal oscillator on the detection circuit 200 of the temperature-compensated crystal oscillator on the other hand.

[0037] The technical solution provided by this utility model embodiment realizes the communication function between the control module and the temperature-compensated crystal oscillator through the first branch. The output frequency detection function is realized through the second branch. The first branch provides a load for the temperature-compensated crystal oscillator on the one hand, and on the other hand, it isolates the influence of the load characteristics of the first switching module on the detection result. Since the first branch provides a load for the temperature-compensated crystal oscillator 200, the temperature-compensated crystal oscillator has sufficient load resistance to operate normally. On the other hand, by setting up the first branch, the first branch effectively isolates the first switching module and the temperature-compensated crystal oscillator, thus preventing the load capacitance characteristics of the first switching module from directly affecting the temperature-compensated crystal oscillator. When the load capacitance characteristics of the first switching module act on the temperature-compensated crystal oscillator, it will cause fluctuations in the output frequency of the temperature-compensated crystal oscillator. By setting up the first branch to provide a load for the temperature-compensated crystal oscillator and isolating the first switching module and the temperature-compensated crystal oscillator through the first branch, the effect of the load capacitance characteristics of the first switching module on the temperature-compensated crystal oscillator is effectively blocked. This configuration improves the anti-interference capability of the temperature-compensated crystal oscillator, ensures it operates in a more optimal detection environment, and enhances the stability of its output frequency. Furthermore, this configuration improves the accuracy of the output frequency detection by the detection circuit of the temperature-compensated crystal oscillator provided in this embodiment.

[0038] Optionally, based on the above embodiments, see also... Figure 1 The communication speed of the second branch 20 is greater than that of the first branch 10.

[0039] Specifically, when the control module 40 is connected to the temperature-compensated crystal oscillator 200 via the second branch 20, the second branch 20 transmits the output frequency of the temperature-compensated crystal oscillator 200 to the control module 40, and the control module 40 detects the output frequency of the temperature-compensated crystal oscillator 200. At this time, the first branch 10 serves as both a load for the temperature-compensated crystal oscillator 200 and an isolation function for the load capacitance of the first switching module 10. When detecting the output frequency of the temperature-compensated crystal oscillator 200, the output frequency is transmitted to the control module 40 via the second branch 20, while the first branch 10 provides both load and isolation for the temperature-compensated crystal oscillator 200. Setting the communication speed of the second branch 20 to be greater than that of the first branch 10 ensures that the output frequency of the temperature-compensated crystal oscillator 200 is completely transmitted to the control module 40, reducing the attenuation of the output frequency during transmission and improving the accuracy and precision of the detection.

[0040] Optional, Figure 2 This is a schematic diagram of the detection circuit for another temperature-compensated crystal oscillator provided as an embodiment of the present invention. Based on the above embodiments, see [link to other embodiments]. Figure 2 The first branch 10 includes an isolation module 11 and an impedance module 12. The first end of the isolation module 11 is connected to the output end of the temperature-compensated crystal oscillator 200, and the second end of the isolation module 11 is connected to the first input end of the first switch module 30. The isolation module 11 is used to isolate the load capacitance characteristic of the first switch module 30 from the temperature-compensated crystal oscillator 200. The first end of the impedance module 12 is connected to the second end of the isolation module 11, and the second end of the impedance module 12 is grounded. The impedance module 12 is used together with the isolation module 11 to provide a load for the temperature-compensated crystal oscillator.

[0041] Specifically, during the detection of the output frequency of the temperature-compensated crystal oscillator 200, the first branch 10 provides a load resistance to the temperature-compensated crystal oscillator 200 and also isolates the load capacitance of the first switching module 30. The isolation module 11 in the first branch 10 isolates the influence of the load capacitance of the first switching module 30 on the output frequency of the temperature-compensated crystal oscillator 200 during the detection process. For example, the isolation module 11 may include at least one resistor. The impedance module 12 in the first branch, together with the isolation module 11, provides a stable load for the temperature-compensated crystal oscillator 200. For example, the impedance module 12 may include at least one resistor. The isolation module 11 and the impedance module 12 are connected in series and together serve as the load for the temperature-compensated crystal oscillator 200 during the detection process.

[0042] Optionally, based on the above embodiments, see also... Figure 2 The isolation module 11 includes a first resistor R1, and the impedance module 12 includes a second resistor R2; the resistance value of the first resistor R1 is less than the resistance value of the second resistor R2.

[0043] Specifically, the isolation module 11 may include a first resistor R1, and the impedance module 12 may include a second resistor R2. The first resistor R1 and the second resistor R2 together provide a fixed load for the temperature-compensated crystal oscillator 200 in detecting its output frequency. Since the first input terminal of the first switching module 30 is connected to the second terminal of the isolation module 11, the first switching module 30 and the temperature-compensated crystal oscillator 200 are isolated by the first resistor R1. The first resistor R1 acts as an isolation element in detecting the output frequency of the temperature-compensated crystal oscillator 200, and the load capacitance characteristic of the first switching module 30 is isolated by the first resistor R1. The load capacitance characteristic of the first switching module 30 does not directly affect the temperature-compensated crystal oscillator 200, ensuring the accuracy of the output frequency of the temperature-compensated crystal oscillator 200.

[0044] In this circuit, the first resistor R1 and the second resistor R2 can be adjustable resistors, and the resistance of the first resistor R1 is less than the resistance of the second resistor R2. Since the first branch 10 also needs to support the communication function between the control module 40 and the temperature-compensated crystal oscillator 200, when the first switch module 30 opens the first branch 10, the control module 40 and the temperature-compensated crystal oscillator 200 communicate through the first resistor R1. The communication method can be IIC communication. Because the communication between the control module 40 and the temperature-compensated crystal oscillator 200 requires the passage of the first resistor R1, the resistance of the first resistor R1 is set to a relatively small value to ensure normal communication between the control module 40 and the temperature-compensated crystal oscillator 200.

[0045] When detecting the output frequency of the temperature-compensated crystal oscillator 200, the first branch 10 provides a fixed load resistor for the temperature-compensated crystal oscillator 200, with a fixed resistance of 10kΩ. The first resistor R1 and the second resistor R2 are set as adjustable resistors, allowing their values ​​to be switched at any time to achieve different functions. When implementing communication functions through the first branch 10, the resistance of the first resistor R1 can be adjusted to a smaller value to avoid excessive resistance affecting communication. The resistance of the first resistor R1 can be between 1-3kΩ, and the resistance of the second resistor R2 can be between 7-10kΩ. For example, the resistance of the first resistor R1 can be adjusted to 2.5kΩ, and the resistance of the second resistor R2 to 7.5kΩ. For the communication signal of the temperature-compensated crystal oscillator 200, communication is normal when the voltage exceeds 70% of the standard voltage.

[0046] Optional, Figure 3This is a schematic diagram of the detection circuit for another temperature-compensated crystal oscillator provided as an embodiment of the present invention. Based on the above embodiments, see [link to other embodiments]. Figure 3 The second branch 20 includes: a high-speed buffer module 21; the first end of the high-speed buffer module 21 is connected to the output end of the temperature-compensated crystal oscillator 200, and the second end of the high-speed buffer module 21 is connected to the second input end of the first switch module 30; the high-speed buffer module 21 is used to connect the control module 40 and the temperature-compensated crystal oscillator 200 for communication and to enhance the transmission speed of the output signal of the temperature-compensated crystal oscillator 200.

[0047] Specifically, the second branch 20 is mainly used to connect the control module 40 and the temperature-compensated crystal oscillator 200, and realizes the function of detecting the output frequency of the temperature-compensated crystal oscillator 200 through the second branch 20. The high-speed buffer module 21 set on the second branch 20 can enhance the transmission speed of the temperature-compensated crystal oscillator 200, prevent the output signal of the temperature-compensated crystal oscillator 200 from being distorted and attenuated during transmission, and improve the accuracy of the detection results of the temperature-compensated crystal oscillator's detection circuit. The high-speed buffer 21 can include a high-speed buffer with an enable pin or a tri-state buffer. When the first switch module 30 switches to the first branch 10, the second branch 20 is in the open state. Using a high-speed buffer with an enable pin or a tri-state buffer, when the second branch 20 is in the open state, the high-speed buffer 21 can present a high-impedance state, disconnecting from the first switch unit 30 and eliminating the influence of the first switch unit 30 on the temperature-compensated crystal oscillator 200.

[0048] Optionally, based on the above embodiments, see also... Figure 2 and Figure 3 The detection circuit of the temperature-compensated crystal oscillator also includes: a capacitive reactance module 50; the first terminal of the capacitive reactance module 50 is connected to the output terminal of the temperature-compensated crystal oscillator 200, and the second terminal of the capacitive reactance module 50 is grounded.

[0049] Specifically, in order to realize the function of detecting the output frequency of the temperature-compensated crystal oscillator 200, a stable capacitive reactance needs to be provided for the temperature-compensated crystal oscillator 200. The capacitive reactance module 50 is connected to the output terminal of the temperature-compensated crystal oscillator 200, and can provide a fixed capacitance to the temperature-compensated crystal oscillator 200 when detecting the output frequency. The capacitive reactance module 50 may include a first capacitor CL, the value of which can be between 8-12pF; for example, the value of the first capacitor CL is 10pF.

[0050] Optional, Figure 4This is a schematic diagram of the detection circuit for another temperature-compensated crystal oscillator provided as an embodiment of the present invention. Based on the above embodiments, see [link to other embodiments]. Figure 4 The detection circuit of the temperature-compensated crystal oscillator also includes: a second switch module 60; the output terminal of the second switch module 60 is connected to the control terminal of the temperature-compensated crystal oscillator 200, the first input terminal of the second switch module 60 is connected to the control signal VC, and the second input terminal of the second switch module is connected to the clock signal SCL.

[0051] Specifically, the detection circuit of the temperature-compensated crystal oscillator also includes a second switch module 60. The output terminal of the second switch module 60 is connected to the control terminal of the temperature-compensated crystal oscillator. The first input terminal of the second switch module 60 is connected to the control signal VC, and the second output terminal is connected to the clock signal SCL. When the second switch module 60 switches to the first input terminal, the control signal VC is transmitted to the temperature-compensated crystal oscillator 200. Only after receiving the control signal VC can the output terminal of the temperature-compensated crystal oscillator 200 output a fixed frequency. Only then can the detection circuit of the temperature-compensated crystal oscillator complete the function of detecting the output frequency. When the first switching module 10 switches to the first branch 10, and the control module 40 communicates with the temperature-compensated crystal oscillator 200 via IIC, the second switch module 60 switches to the second input terminal, and the control terminal of the temperature-compensated crystal oscillator 200 receives the clock signal SCL. The temperature-compensated crystal oscillator 200 realizes the IIC communication function with the control module 40 based on the received clock signal SCL. The first switch module 30 and the second switch module 60 can be single-pole double-throw high-speed switches.

[0052] This utility model embodiment also provides a detection device for a temperature-compensated crystal oscillator, which includes the detection circuit for the temperature-compensated crystal oscillator provided in any of the above embodiments. Since the detection device for the temperature-compensated crystal oscillator provided in this utility model embodiment includes the detection circuit for the temperature-compensated crystal oscillator provided in this utility model embodiment, it also has the same beneficial effects, and will not be described again here.

[0053] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A detection circuit for a temperature-compensated crystal oscillator, characterized in that, include: First branch circuit, second branch circuit, first switch module and control module; The first branch and the second branch are used to connect to the output terminal of the temperature-compensated crystal oscillator; The first input terminal of the first switch module is connected to the first branch, the second input terminal of the first switch module is connected to the second branch, and the output terminal of the first switch module is connected to the control module. The first switch module is used to switch the control module to be connected to the temperature-compensated crystal oscillator through the first branch or the second branch. The first branch is used to provide a load for the temperature-compensated crystal oscillator and to isolate the load capacitance characteristics of the first switching module from acting on the temperature-compensated crystal oscillator; the second branch is used to connect the control module and the temperature-compensated crystal oscillator for communication.

2. The detection circuit of the temperature-compensated crystal oscillator according to claim 1, characterized in that, The communication speed of the second branch is greater than that of the first branch.

3. The detection circuit of the temperature-compensated crystal oscillator according to claim 1, characterized in that, The first branch includes: an isolation module and an impedance module; The first end of the isolation module is connected to the output end of the temperature-compensated crystal oscillator, and the second end of the isolation module is connected to the first input end of the first switch module. The isolation module is used to isolate the load capacitance characteristics of the first switch module from acting on the temperature-compensated crystal oscillator. The first end of the impedance module is connected to the second end of the isolation module, and the second end of the impedance module is grounded. The impedance module, together with the isolation module, provides a load for the temperature-compensated crystal oscillator.

4. The detection circuit of the temperature-compensated crystal oscillator according to claim 3, characterized in that, The isolation module includes a first resistor, and the impedance module includes a second resistor; The resistance of the first resistor is less than the resistance of the second resistor.

5. The detection circuit of the temperature-compensated crystal oscillator according to claim 4, characterized in that, Both the first resistor and the second resistor are adjustable resistors.

6. The detection circuit of the temperature-compensated crystal oscillator according to claim 1, characterized in that, The second branch includes: a high-speed buffer module; The first end of the high-speed buffer module is connected to the output end of the temperature-compensated crystal oscillator, and the second end of the high-speed buffer module is connected to the second input end of the first switch module; the high-speed buffer module is used to connect the control module and the temperature-compensated crystal oscillator for communication and to enhance the transmission speed of the output signal of the temperature-compensated crystal oscillator.

7. The detection circuit of the temperature-compensated crystal oscillator according to claim 6, characterized in that, The high-speed buffer module includes a high-speed buffer with an enable pin or a tri-state buffer.

8. The detection circuit of the temperature-compensated crystal oscillator according to claim 1, characterized in that, Also includes: Capacitive reactance module; The first terminal of the capacitive reactance module is connected to the output terminal of the temperature-compensated crystal oscillator, and the second terminal of the capacitive reactance module is grounded.

9. The detection circuit of the temperature-compensated crystal oscillator according to claim 1, characterized in that, Also includes: Second switch module; The output terminal of the second switch module is connected to the control terminal of the temperature-compensated crystal oscillator, the first input terminal of the second switch module is connected to the control signal, and the second input terminal of the second switch module is connected to the clock signal.

10. A detection device for a temperature-compensated crystal oscillator, characterized in that, The detection circuit includes the temperature-compensated crystal oscillator as described in any one of claims 1-9.

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