Temperature compensation circuit and power amplifier

Abstract

The present application discloses a temperature compensation circuit and a power amplifier, wherein the temperature compensation circuit is used to provide a compensation signal to a target circuit, and the temperature compensation circuit includes at least one first temperature compensation module, at least one second temperature compensation module and a switch module connecting the first temperature compensation module and the second temperature compensation module; the first temperature compensation module is used to output a first compensation signal to a compensation node within a first temperature range, and the first compensation signal has a first correlation with the temperature; the second temperature compensation module is used to output a second compensation signal to the compensation node within a third temperature range, and the second compensation signal has a second correlation with the temperature; wherein the switch module is at least used to conduct a connection path between the first temperature compensation module and the second temperature compensation module within the first temperature range, and to disconnect the connection path between the first temperature compensation module and the second temperature compensation module within the third temperature range.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a temperature compensation circuit and a power amplifier. Background Art

[0002] In radio frequency microwave systems such as wireless communications and radar, PAs (Power Amplifiers) are widely used in various signal transmission links, responsible for amplifying and outputting the power of radio frequency signals.

[0003] With the advancement of mobile communication technology, the requirements for power amplifiers in communication systems are becoming increasingly stringent. Gain linearity is a key performance indicator for power amplifiers, directly impacting the communication quality of mobile terminals. Because power amplifier performance (such as gain) is easily affected by external temperature, proper temperature compensation is crucial to ensure optimal performance and improve thermal stability. Summary of the Invention

[0004] Based on this, the embodiments of the present application provide a temperature compensation circuit and a power amplifier, which are designed to output a more accurate compensation signal under different temperature environments.

[0005] In a first aspect, an embodiment of the present application provides a temperature compensation circuit for providing a compensation signal to a target circuit, the temperature compensation circuit comprising at least one first temperature compensation module, at least one second temperature compensation module, and a switch module connecting the first temperature compensation module and the second temperature compensation module;

[0006] The first temperature compensation module is used to output a first compensation signal to the compensation node within a first temperature range, and the first compensation signal has a first correlation with the temperature;

[0007] The second temperature compensation module is configured to output a second compensation signal to the compensation node within a third temperature range, the second compensation signal has a second correlation with the temperature, and a minimum value of the third temperature range is greater than a maximum value of the first temperature range;

[0008] The switch module is configured to connect the first temperature compensation module and the second temperature compensation module at least within the first temperature range, and disconnect the first temperature compensation module and the second temperature compensation module at least within the third temperature range.

[0009] Optionally, the compensation signals output by the first temperature compensation module and the second temperature compensation module in a second temperature interval are independent of temperature, and the second temperature interval is located between the first temperature interval and the third temperature interval.

[0010] Optionally, the first temperature compensation module includes a first positive temperature compensation unit and a first zero temperature compensation unit connected to the first positive temperature compensation unit, the first positive temperature compensation unit is used to receive a first positive temperature coefficient current, and the first zero temperature compensation unit is used to receive a first zero temperature coefficient current; and in the first temperature range, the first temperature compensation module outputs the first compensation signal to the compensation node.

[0011] Optionally, the first positive temperature compensation unit includes a first transistor and a second transistor, and the first zero temperature compensation unit includes a third transistor and a fourth transistor, wherein the controlled ends of the first transistor and the second transistor are used to receive the first positive temperature coefficient current output by the first positive temperature coefficient power supply; and the controlled ends of the third transistor and the fourth transistor are used to receive the first zero temperature coefficient current output by the first zero temperature coefficient power supply;

[0012] In addition, the first end of the first transistor is used to connect to the power supply, the second end of the first transistor is connected to the first end of the second transistor, the second end of the second transistor is connected to the second end of the third transistor and the first end of the fourth transistor, the second end of the fourth transistor is grounded, and the first end of the third transistor is connected to the switch module and is connected to the branch where the compensation point is located through the switch module.

[0013] Optionally, in the first temperature range, the first transistor, the second transistor, the third transistor and the fourth transistor are in an on state, and the first temperature compensation module outputs the first compensation signal to the compensation node via the third transistor.

[0014] Optionally, in the second temperature range and the third temperature range, the third transistor is in an off state.

[0015] Optionally, the first transistor and the second transistor are first-type transistors, the third transistor and the fourth transistor are second-type transistors different from the first-type transistors, the first-type transistor is a PMOS transistor, and the second-type transistor is an NMOS transistor.

[0016] Optionally, the second temperature compensation module includes a second positive temperature compensation unit and a second zero temperature compensation unit connected to the second positive temperature compensation unit, the second positive temperature compensation unit is used to receive a second positive temperature coefficient current, and the second zero temperature compensation unit is used to receive a second zero temperature coefficient current; in the third temperature range, the second temperature compensation module outputs the second compensation signal to the compensation node.

[0017] Optionally, the second positive temperature compensation unit includes a fifth transistor and a sixth transistor, and the second zero temperature compensation unit includes a seventh transistor and an eighth transistor, wherein the controlled ends of the fifth transistor and the sixth transistor are used to receive the second positive temperature coefficient current output by the second positive temperature coefficient power supply; and the controlled ends of the seventh transistor and the eighth transistor are used to receive the first zero temperature coefficient current output by the first zero temperature coefficient power supply;

[0018] In addition, the first end of the seventh transistor is used to connect to the power supply, the second end of the seventh transistor is connected to the first end of the eighth transistor, the second end of the eighth transistor is connected to the second end of the fifth transistor and the first end of the sixth transistor, the second end of the sixth transistor is grounded, and the first end of the fifth transistor is connected to the switch module and the branch where the compensation point is located.

[0019] Optionally, in the third temperature range, the fifth transistor, the sixth transistor, the seventh transistor and the eighth transistor are in an on state, and the second temperature compensation module outputs the second compensation signal to the compensation node via the seventh transistor.

[0020] Optionally, in the first temperature range and the second temperature range, the fifth transistor is in an off state.

[0021] Optionally, the switch module includes a switch tube, a first end of the switch tube is connected to the first temperature compensation module, and a second end of the switch tube is connected to the second temperature compensation module, and the controlled end of the switch tube is used to receive a control signal to conduct the connection path between the first temperature compensation module and the second temperature compensation module within the first temperature range, and to disconnect the connection path between the first temperature compensation module and the second temperature compensation module within the third temperature range.

[0022] Optionally, the switching module includes a switching tube, a first end of the switching tube is connected to the first zero temperature compensation unit of the first temperature compensation module, a second end of the switching tube is connected to the second positive temperature compensation unit of the second temperature compensation module, and a controlled end of the switching tube is used to receive a control signal.

[0023] Optionally, the switch tube is a MOS tube, and the first end of the switch tube is the source of the MOS tube, the second end of the switch tube is the drain of the MOS tube, and the controlled end of the switch tube is the gate of the MOS tube.

[0024] Optionally, the temperature compensation circuit also includes a switch control module, which is connected to the switch module and is used to output a first control signal to the switch module within the first temperature range to control the switch module to turn on the connection path between the first temperature compensation module and the second temperature compensation module; and output a second control signal to the switch module within the third temperature range to control the switch module to disconnect the connection path between the first temperature compensation module and the second temperature compensation module.

[0025] Optionally, in the first correlation, the magnitude of the first compensation signal is negatively correlated with temperature, and in the second correlation, the magnitude of the second compensation signal is positively correlated with temperature.

[0026] Optionally, the compensation signals output by the first temperature compensation module and the second temperature compensation module are zero within the second temperature range.

[0027] Optionally, the temperature compensation circuit includes at least two first temperature compensation modules, and at least some of the first temperature compensation modules include a first switch, and the first switch is used to adjust the number of the first temperature compensation modules connected to the temperature compensation circuit;

[0028] In the first temperature range, when the number of the first temperature compensation modules connected to the temperature compensation circuit increases, the compensation signal value corresponding to the first compensation signal increases; when the number of the first temperature compensation modules connected to the temperature compensation circuit decreases, the compensation signal value corresponding to the first compensation signal decreases;

[0029] And / or, the temperature compensation circuit includes at least two second temperature compensation modules, and at least some of the second temperature compensation modules include a second switch, and the second switch is used to adjust the number of the second temperature compensation modules connected to the temperature compensation circuit;

[0030] In the third temperature range, when the number of the second temperature compensation modules connected to the temperature compensation circuit increases, the compensation signal value corresponding to the second compensation signal increases; when the number of the second temperature compensation modules connected to the temperature compensation circuit decreases, the compensation signal value corresponding to the second compensation signal decreases.

[0031] Optionally, by increasing the number of the first temperature compensation modules connected to the temperature compensation circuit, the amount of change of the first compensation signal per unit time in the first correlation increases; and by reducing the number of the first temperature compensation modules connected to the temperature compensation circuit, the amount of change of the first compensation signal per unit time in the first correlation decreases;

[0032] By increasing the number of the second temperature compensation modules connected to the temperature compensation circuit, the amount of change of the second compensation signal per unit time in the second correlation increases; by reducing the number of the second temperature compensation modules connected to the temperature compensation circuit, the amount of change of the second compensation signal per unit time in the second correlation decreases.

[0033] Optionally, the switch module is further configured to disconnect a connection path between the first temperature compensation module and the second temperature compensation module within the second temperature range.

[0034] In a second aspect, the present application further provides a temperature compensation circuit for providing a compensation signal to a target circuit, wherein the temperature compensation circuit includes at least one first temperature compensation module and at least one second temperature compensation module;

[0035] The first temperature compensation module is used to output a first compensation signal to the compensation node within a first temperature range, and the first compensation signal has a first correlation with the temperature;

[0036] The second temperature compensation module is configured to output a second compensation signal to the compensation node within a third temperature range, the second compensation signal having a second correlation with temperature, and the compensation signals output by the first temperature compensation module and the second temperature compensation module within the second temperature range are independent of temperature, the second temperature range being between the first temperature range and the third temperature range;

[0037] In the first correlation, the magnitude of the first compensation signal is negatively correlated with the temperature, and in the second correlation, the magnitude of the second compensation signal is positively correlated with the temperature.

[0038] In a third aspect, the present application further provides a temperature compensation circuit for providing a compensation signal to a target circuit, the temperature compensation circuit comprising at least one first temperature compensation module, at least one second temperature compensation module, and a switch module connecting the first temperature compensation module and the second temperature compensation module;

[0039] The first temperature compensation module is used to output a first compensation signal to the compensation node within a first temperature range, and the first compensation signal has a first correlation with the temperature;

[0040] The second temperature compensation module is configured to output a second compensation signal to the compensation node within a third temperature range, the second compensation signal has a second correlation with the temperature, and a minimum value of the third temperature range is greater than a maximum value of the first temperature range;

[0041] The compensation signals output by the first temperature compensation module and the second temperature compensation module in a second temperature range are independent of temperature, and the second temperature range is between the first temperature range and the third temperature range;

[0042] The switch module is configured to connect the first temperature compensation module and the second temperature compensation module when the temperature is less than or equal to a first threshold, and disconnect the first temperature compensation module and the second temperature compensation module when the temperature is greater than the first threshold;

[0043] The first threshold is smaller than the maximum temperature value of the third temperature interval and larger than the maximum temperature value of the first temperature interval.

[0044] In a fourth aspect, the present application further provides a power amplifier, which includes the aforementioned temperature compensation circuit and a power amplifier circuit, wherein the input end of the power amplifier circuit is connected to the output end of the temperature compensation circuit.

[0045] As can be seen from the above technical solution, the temperature compensation circuit provided in this application is used to provide a compensation signal to a target circuit (e.g., a bias circuit). The compensation signal output by the temperature compensation circuit to the target circuit can change with changes in temperature. Therefore, the electrical signal (e.g., the bias signal) output by the target circuit (e.g., the bias circuit) will change with changes in the compensation signal output by the temperature compensation circuit to the compensation node.

[0046] Therefore, in a scenario where a temperature compensation circuit is applied to a power amplifier, after connecting the bias circuit to the compensation node, a compensation signal that changes with temperature can be received through the compensation node as a bias pre-signal (e.g., a bias source signal or a bias control signal), so that the bias circuit can output a bias signal that changes with temperature to the power amplifier. That is, the bias signal output by the bias circuit is adapted to the current temperature, thereby avoiding the performance degradation of the power amplifier due to excessive temperature compensation.

[0047] In order to achieve the accuracy of the compensation signal output by the temperature compensation circuit to the compensation node under different temperature conditions, the temperature compensation circuit provided in the present application has a first temperature compensation module outputting a first compensation signal to the compensation node at least in a first temperature range, and a second temperature compensation module outputting a second compensation signal to the compensation node in a third temperature range, and the first compensation signal has a first correlation with the temperature, and the second compensation signal has a second correlation with the temperature, and the first correlation and the second correlation have different correlations with the temperature, so that the temperature compensation circuit can achieve compensation effects with different temperature correlations in different temperature ranges, making the application scenarios of the temperature compensation circuit more diverse.

[0048] Furthermore, under high temperature conditions, such as the third temperature range, the first temperature compensation module may leak the compensation signal to the compensation node. This signal leakage may affect the accuracy of the electrical signal at the compensation node of the temperature compensation circuit in the third temperature range. Therefore, a switch module is provided in the temperature compensation circuit of the present application, which connects the first temperature compensation module and the second temperature compensation module via the switch module. The switch module conducts the connection path between the first temperature compensation module and the second temperature compensation module in the first temperature range, and disconnects the connection path between the first temperature compensation module and the second temperature compensation module in the third temperature range. This effectively prevents the first temperature compensation module from leaking the compensation signal to the compensation node in the third temperature range, thereby affecting the accuracy of the compensation signal output by the temperature compensation circuit to the compensation node in the third temperature range. This improves the accuracy and reliability of the compensation signal output by the temperature compensation circuit to the compensation node, thereby achieving higher-precision temperature compensation.

[0049] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0051] Figure 1 This is a block diagram of a power amplifier provided in an embodiment of the present application;

[0052] Figure 2 It is a schematic diagram of the relationship between the compensation signal provided by the temperature compensation circuit to the compensation node and the temperature in different temperature ranges;

[0053] Figure 3 This is a schematic diagram of a circuit structure of a temperature compensation circuit provided in an embodiment of the present application;

[0054] Figure 4 Schematic diagram of the relationship between the current flowing through multiple transistors and the compensation signal and temperature in the temperature compensation circuit provided by an embodiment of the present application;

[0055] Figure 5 This is a schematic diagram of the relationship between the current flowing through multiple transistors and the compensation signal and temperature in a modified structure of a temperature compensation circuit;

[0056] Figure 6 It is a specific circuit structure diagram of the switch control module;

[0057] Figure 7 This is a schematic diagram of a modified circuit structure of the temperature compensation circuit provided in an embodiment of the present application;

[0058] Figure 8 yes Figure 7 Schematic diagram of changes in the compensation signal output to the compensation node in the deformed circuit structure;

[0059] Figure 9 It is a schematic diagram of the relationship between the compensation voltage and compensation current of the compensation node;

[0060] Figure 10 and Figure 11 1 is a schematic diagram of a circuit structure of different variations of the temperature compensation circuit provided in an embodiment of the present application;

[0061] Figure 12 yes Figure 11 A schematic diagram illustrating the relationship between currents flowing through multiple transistors and compensation signals and temperature in a temperature compensation circuit is provided. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] It should be noted that the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections. They can refer to mechanical connections or electrical connections. They can refer to direct connections or indirect connections through an intermediary. They can refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0065] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, combined, or partially merged, so the actual execution order may vary depending on the actual situation.

[0066] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0067] See also Figure 1 , Figure 1 A circuit structure block diagram of a power amplifier provided in an embodiment of the present application.

[0068] like Figure 1 As shown, the power amplifier 1 includes a temperature compensation circuit 100, a bias circuit 200, and a power amplifier circuit 300. The temperature compensation circuit 100 is configured to output a target compensation signal adapted to the temperature within the target temperature range to a target object within the target temperature range. The target object includes, but is not limited to, a target circuit and a target component. For example, the target object includes the bias circuit 200. The temperature compensation circuit 100 outputs the target compensation signal to a compensation node of the temperature compensation circuit 100 within the target temperature range. The bias circuit 200 is connected to the compensation node or to a branch where the compensation node is located, so that the temperature compensation circuit 100 can output the corresponding target compensation signal to the bias circuit 200 through the compensation node within the target temperature range.

[0069] The bias circuit 200 is connected to the temperature compensation circuit 100 and the power amplifier circuit 300. The bias circuit 200 is further configured to receive the target compensation signal output by the temperature compensation circuit 100 and output a corresponding bias signal. Optionally, the magnitude of the bias signal output by the bias circuit 200 is related to the magnitude of the target compensation signal output by the temperature compensation circuit 100. For example, the magnitude of the bias signal output by the bias circuit 200 is positively correlated with the magnitude of the target compensation signal output by the temperature compensation circuit 100. That is, the larger the target compensation signal output by the temperature compensation circuit 100, the larger the bias signal output by the bias circuit 200.

[0070] The power amplifier circuit 300 is configured to receive a bias signal and an RF input signal and output an RF output signal. The amplification factor of the RF input signal by the power amplifier circuit 300 is related to the magnitude of the bias signal output by the bias circuit 200. For example, within the effective amplification range of the power amplifier circuit 300, the amplification factor of the RF input signal by the power amplifier circuit 300 is positively correlated with the magnitude of the bias signal.

[0071] It can be understood that the compensation signal can be a compensation voltage or a compensation current, and the bias signal can be a bias voltage or a bias current, which is not limited here.

[0072] In some embodiments, the target temperature range includes at least a first temperature range and a third temperature range. The maximum value of the first temperature range is less than the minimum value of the third temperature range, and the temperature compensation circuit 100 outputs a first compensation signal to the compensation node in the first temperature range, wherein the first compensation signal has a first correlation with the temperature. The temperature compensation circuit 100 outputs a second compensation signal to the compensation node in the third temperature range, wherein the second compensation signal has a second correlation with the temperature, which is different from the first correlation.

[0073] Optionally, the second correlation is different from the first correlation. In the first correlation, the magnitude of the first compensation signal may be negatively correlated with temperature, i.e., the lower the temperature, the larger the first compensation signal outputted to the compensation node by the temperature compensation circuit 100; conversely, the higher the temperature, the smaller the first compensation signal outputted to the compensation node by the temperature compensation circuit 100. In the second correlation, the magnitude of the second compensation signal may be positively correlated with temperature, i.e., the lower the temperature, the smaller the second compensation signal outputted to the compensation node by the temperature compensation circuit 100; conversely, the higher the temperature, the larger the second compensation signal outputted to the compensation node by the temperature compensation circuit 100.

[0074] In some embodiments, the target temperature range further includes a second temperature range, and the second temperature range is between the first temperature range and the third temperature range. The compensation signal output by the temperature compensation circuit 100 to the compensation node in the second temperature range is independent of temperature. For example, the compensation signal output by the temperature compensation circuit 100 to the compensation node in the second temperature range is zero, and the temperature compensation circuit 100 does not output a compensation signal to the compensation node in the second temperature range.

[0075] For example, the minimum value of the first temperature interval is t0 and the maximum value is t1. The minimum value of the third temperature interval is t2 and the maximum value is t3, then, t3>t2>t1>t0.

[0076] For example, the interval temperature value corresponding to the first temperature interval is (t0-t1], the interval temperature value corresponding to the second temperature interval is (t1-t2), and the interval temperature value corresponding to the third temperature interval is [t2-t3]. Among them, the values ​​corresponding to t0, t1, t2, and t3 can be set as needed. Optionally, t1 can be set to any value between -40°C and 20°C, and t2 can be set to any value between 30°C and 125°C. For example, t1 can be -5°C, 0°C, or 10°C, and t2 can be 35°C, 40°C, or 50°C. It can be understood that the values ​​corresponding to t0, t1, t2, and t3 can also be set as needed.

[0077] See also Figure 2 , the compensation signal outputted by the temperature compensation circuit 100 to the compensation node is a compensation current as an example for description.

[0078] The temperature value corresponding to the first temperature interval is (t0-t1]. At this time, the compensation current output by the temperature compensation circuit 100 to the compensation node is negatively correlated with the temperature. That is, within the first temperature interval, the higher the temperature value, the smaller the compensation current output by the temperature compensation circuit 100 to the compensation node.

[0079] The temperature value corresponding to the second temperature range is (t1-t2). At this time, the compensation current output by the temperature compensation circuit 100 to the compensation node is independent of the temperature. For example, in the second temperature range, the temperature compensation circuit 100 does not output a compensation signal to the compensation node.

[0080] The temperature value corresponding to the third temperature interval is [t2-t3). At this time, the compensation current output by the temperature compensation circuit 100 to the compensation node is positively correlated with the temperature, that is, in the third temperature interval, the higher the temperature value, the greater the compensation current output by the temperature compensation circuit 100 to the compensation node.

[0081] See also Figure 3 In some embodiments, the temperature compensation circuit 100 is provided with a compensation node (such as compensation node D) for connecting a target object, and the temperature compensation circuit 100 includes at least one first temperature compensation module 10, at least one second temperature compensation module 20, a switch module 30 connecting the first temperature compensation module 10 and the second temperature compensation module 20, and a power supply module 40.

[0082] The first temperature compensation module 10 is configured to output a first compensation signal to the compensation node within a first temperature range, wherein the first compensation signal has a first correlation with the temperature. The second temperature compensation module 20 is configured to output a second compensation signal to the compensation node within a third temperature range, wherein the second compensation signal has a second correlation with the temperature.

[0083] The switch module 30 is at least used to connect the connection path between the first temperature compensation module 10 and the second temperature compensation module 20 in a first temperature range, and disconnect the connection path between the first temperature compensation module 10 and the second temperature compensation module 20 in a third temperature range.

[0084] The output end of the power module 40 is connected to the compensation node or the branch where the compensation node is located, and is used to provide a basic electrical signal to the supplementary node. The basic electrical signal can be a basic voltage or a basic current.

[0085] In some embodiments, the compensation signals output by the first temperature compensation module 10 and the second temperature compensation module 20 of the temperature compensation circuit 100 in a second temperature range are independent of temperature, and the second temperature range is between the first temperature range and the third temperature range.

[0086] Optionally, the compensation signals output by the first temperature compensation module 10 and the second temperature compensation module 20 in the second temperature range are zero.

[0087] like Figure 3 As shown, for example, the first temperature compensation module 10 is further configured to receive a first positive temperature coefficient current and a first zero temperature coefficient current. The first positive temperature coefficient current and the first zero temperature coefficient current enable the first temperature compensation module 10 to output a first compensation signal to the compensation node within a first temperature range. The second temperature compensation module 20 is further configured to receive a second positive temperature coefficient current and a second zero temperature coefficient current. The second positive temperature coefficient current and the second zero temperature coefficient current enable the second temperature compensation module 20 to output a second compensation signal to the compensation node within a third temperature range.

[0088] The first positive temperature coefficient current is the current output by a first positive temperature coefficient power supply A1 connected to the first temperature compensation module 10. The first positive temperature coefficient power supply A1 may be a positive temperature coefficient current source. The first zero temperature coefficient current is the current output by a first zero temperature coefficient power supply B1 connected to the first temperature compensation module 10. The first zero temperature coefficient power supply B1 may be a zero temperature coefficient current source. The magnitude of the first positive temperature coefficient current is positively correlated with temperature. The magnitude of the first zero temperature coefficient current is independent of temperature.

[0089] The second positive temperature coefficient current is the current output by a second positive temperature coefficient power supply A2 connected to the second temperature compensation module 20. The second positive temperature coefficient power supply A2 may be a positive temperature coefficient current source. The second zero temperature coefficient current is the current output by a second zero temperature coefficient power supply B2 connected to the second temperature compensation module 20. The second zero temperature coefficient power supply B2 may be a zero temperature coefficient current source. The magnitude of the second positive temperature coefficient current is positively correlated with temperature. The magnitude of the second zero temperature coefficient current is independent of temperature.

[0090] like Figure 3As shown, the first positive temperature coefficient current output by the first positive temperature coefficient power supply A1 and the first zero temperature coefficient current output by the first zero temperature coefficient power supply B1 are controllable, and the second positive temperature coefficient current output by the second positive temperature coefficient power supply A2 and the second zero temperature coefficient current output by the second zero temperature coefficient power supply B2 are controllable. It is only necessary to ensure that within the first temperature range, the first temperature compensation module 10 can output a first compensation signal to the compensation node after receiving the first positive temperature coefficient current and the first zero temperature coefficient current. Within the third temperature range, the second temperature compensation module 20 can output a second compensation signal to the compensation node after receiving the second positive temperature coefficient current and the second zero temperature coefficient current.

[0091] In this embodiment, the magnitudes of the first positive temperature coefficient current and the second positive temperature coefficient current are both positively correlated with temperature, and the magnitudes of the first zero temperature coefficient current and the second zero temperature coefficient current are both independent of temperature.

[0092] In the first temperature interval (t0-t1], the first temperature compensation module 10 outputs a first compensation signal to the compensation node after receiving the first positive temperature coefficient current and the first zero temperature coefficient current, and the second temperature compensation module 20 does not output a compensation signal to the compensation node after receiving the second positive temperature coefficient current and the second zero temperature coefficient current.

[0093] In the second temperature range (t1-t2), the first temperature compensation module 10 does not output a compensation signal to the compensation node after receiving the first positive temperature coefficient current and the first zero temperature coefficient current. Furthermore, the second temperature compensation module 20 does not output a compensation signal to the compensation node after receiving the second positive temperature coefficient current and the second zero temperature coefficient current.

[0094] In the third temperature interval [t2-t3), the second temperature compensation module 20 outputs a second compensation signal to the compensation node after receiving the second positive temperature coefficient current and the second zero temperature coefficient current. Optionally, in the third temperature interval [t2-t3), the first temperature compensation module 10 does not output a compensation signal to the compensation node after receiving the first positive temperature coefficient current and the first zero temperature coefficient current.

[0095] In some embodiments, the second temperature range is determined by the correlation characteristic between the current and temperature corresponding to the target temperature coefficient current, and the target temperature coefficient current includes a first positive temperature coefficient current, a first zero temperature coefficient current, a second positive temperature coefficient current, and a second zero temperature coefficient current.

[0096] Optionally, the temperature value corresponding to when the first positive temperature coefficient current is equal to the first zero temperature coefficient current is the minimum temperature value of the second temperature interval. The temperature value corresponding to when the second positive temperature coefficient current is equal to the second zero temperature coefficient current is the maximum temperature value of the second temperature interval.

[0097] When the first positive temperature coefficient current is equal to the first zero temperature coefficient current, the corresponding temperature value is the minimum temperature value t1 of the second temperature interval. When the second zero temperature coefficient current is equal to the second positive temperature coefficient current, the corresponding temperature value is the maximum temperature value t2 of the second temperature interval. In the above embodiment, it can be seen that the temperature compensation circuit 100 provided in the embodiment of the present application is used to provide a compensation signal to the target circuit (e.g., a bias circuit). The compensation signal output by the temperature compensation circuit to the target circuit can change with changes in temperature. Therefore, the electrical signal (e.g., a bias signal) output by the target circuit (e.g., a bias circuit) will change with changes in the compensation signal output by the temperature compensation circuit to the compensation node.

[0098] Therefore, in a scenario where a temperature compensation circuit is applied to a power amplifier, after connecting the bias circuit to the compensation node, a compensation signal that changes with temperature can be received through the compensation node as a bias pre-signal (e.g., a bias source signal or a bias control signal), so that the bias circuit can output a bias signal that changes with temperature to the power amplifier. That is, the bias signal output by the bias circuit is adapted to the current temperature, thereby avoiding the performance degradation of the power amplifier due to excessive temperature compensation.

[0099] In order to achieve the accuracy of the compensation signal output by the temperature compensation circuit 100 to the compensation node under different temperature conditions, the temperature compensation circuit 100 provided in the present application has a first temperature compensation module 10 outputting a first compensation signal to the compensation node within a first temperature range, and a second temperature compensation module 20 outputting a second compensation signal to the compensation node within a third temperature range, and the first compensation signal has a first correlation with the temperature, and the second compensation signal has a second correlation with the temperature, and the first correlation and the second correlation have different correlations with the temperature, so that the temperature compensation circuit 100 can achieve compensation effects with different temperature correlations within different temperature ranges, making the application scenarios of the temperature compensation circuit 100 more diverse.

[0100] Furthermore, under high temperature conditions, such as the third temperature range, the first temperature compensation module 10 may leak compensation signals to the compensation node. This signal leakage may affect the accuracy of the electrical signal at the compensation node of the temperature compensation circuit 100 in the third temperature range. Therefore, the temperature compensation circuit 100 of the present application is provided with a switch module, which connects the first temperature compensation module 10 and the second temperature compensation module 20. The switch module conducts the connection path between the first temperature compensation module 10 and the second temperature compensation module 20 in the first temperature range, and disconnects the connection path between the first temperature compensation module 10 and the second temperature compensation module 20 in the third temperature range. This effectively prevents the first temperature compensation module 10 from leaking compensation signals to the compensation node in the third temperature range, which could affect the accuracy of the compensation signals output by the temperature compensation circuit 100 to the compensation node in the third temperature range. This improves the accuracy and reliability of the compensation signals output by the temperature compensation circuit 100 to the compensation node, thereby achieving higher-precision temperature compensation.

[0101] In some embodiments, the switch module 30 is further configured to disconnect the connection path between the first temperature compensation module 10 and the second temperature compensation module 20 within the second temperature range.

[0102] Optionally, the switch module 30 is used to open the connection path between the first temperature compensation module 10 and the second temperature compensation module 20 when the temperature is less than or equal to a first threshold, and to disconnect the connection path between the first temperature compensation module 10 and the second temperature compensation module 20 when the temperature is greater than the first threshold; wherein the first threshold is less than the maximum temperature value of the third temperature interval and greater than the maximum temperature value of the first temperature interval.

[0103] That is, at least in the third temperature range, the switch module 30 disconnects the connection path between the first temperature compensation module 10 and the second temperature compensation module 20, thereby preventing the first temperature compensation module 10 from outputting a signal to the compensation node. Alternatively, in part of the second temperature range and in the third temperature range, the switch module 30 disconnects the connection path between the first temperature compensation module 10 and the second temperature compensation module 20, thereby preventing the first temperature compensation module 10 from outputting a signal to the compensation node.

[0104] In this embodiment, in order to avoid the problem of the first temperature compensation module 10 leaking the compensation signal to the compensation node in the second temperature range, and to improve the accuracy of the compensation signal output by the temperature compensation circuit 100 to the compensation node, the present application controls the switch module in the second temperature range to disconnect the connection path between the first temperature compensation module 10 and the second temperature compensation module 20, so as to effectively avoid the first temperature compensation module 10 leaking the compensation signal to the compensation node in the second temperature range.

[0105] See also Figures 3 and 4 In some embodiments, the first temperature compensation module 10 includes a first positive temperature compensation unit 101 and a first zero temperature compensation unit 102 connected to the first positive temperature compensation unit 101, the first positive temperature compensation unit 101 is used to receive a first positive temperature coefficient current, and the first zero temperature compensation unit 102 is used to receive a first zero temperature coefficient current; in the first temperature range, the first temperature compensation module 10 outputs a first compensation signal to the compensation node after receiving the first positive temperature coefficient current and the first zero temperature coefficient current.

[0106] Exemplarily, the first positive temperature compensation unit 101 includes a first transistor P1 and a second transistor P2, and the first zero temperature compensation unit 102 includes a third transistor N1 and a fourth transistor N2, wherein the controlled ends of the first transistor P1 and the second transistor P2 are used to be connected to a first positive temperature coefficient power supply, and the first positive temperature coefficient power supply is used to output a first positive temperature coefficient current; the controlled ends of the third transistor N1 and the fourth transistor N2 are used to be connected to a first zero temperature coefficient power supply, and the first zero temperature coefficient power supply is used to output a first zero temperature coefficient current.

[0107] In addition, the first end of the first transistor P1 is used to connect to the power supply VDD, the second end of the first transistor P1 is connected to the first end of the second transistor P2, the second end of the second transistor P2 is connected to the second end of the third transistor N1 and the first end of the fourth transistor N2, the second end of the fourth transistor N2 is grounded, and the first end of the third transistor N1 is connected to the switch module 30 and is connected to the branch where the compensation point is located through the switch module 30.

[0108] Furthermore, in the first temperature range, the first transistor P1, the second transistor P2, the third transistor N1, and the fourth transistor N2 are in the on state, and the first temperature compensation module 10 outputs the first compensation signal to the compensation node via the third transistor N1. In the second and third temperature ranges, no current is output to the compensation node via the third transistor N1, and the third transistor N1 is equivalently in the off state.

[0109] Optionally, the first transistor P1 and the second transistor P2 are first-type transistors, the third transistor N1 and the fourth transistor N2 are the same-type transistors, and the third transistor N1 and the fourth transistor N2 are second-type transistors different from the first-type transistors. For example, the first-type transistor is a PMOS transistor, and the second-type transistor is an NMOS transistor.

[0110] like Figure 3As shown, in some embodiments, the second temperature compensation module 20 includes a second positive temperature compensation unit 201 and a second zero temperature compensation unit 202 connected to the second positive temperature compensation unit 201. The second positive temperature compensation unit 201 is configured to receive a second positive temperature coefficient current, and the second zero temperature compensation unit 202 is configured to receive a second zero temperature coefficient current. In the third temperature range, after receiving the second positive temperature coefficient current and the second zero temperature coefficient current, the second temperature compensation module 20 outputs a second compensation signal to the compensation node.

[0111] Exemplarily, the second positive temperature compensation unit 201 includes a fifth transistor N3 and a sixth transistor N4, and the second zero temperature compensation unit 202 includes a seventh transistor P3 and an eighth transistor P4, wherein the controlled ends of the fifth transistor N3 and the sixth transistor N4 are used to be connected to a second positive temperature coefficient power supply, and the second positive temperature coefficient power supply is used to output a second positive temperature coefficient current; the controlled ends of the seventh transistor P3 and the eighth transistor P4 are used to be connected to a second zero temperature coefficient power supply, and the second zero temperature coefficient power supply is used to output a second zero temperature coefficient current.

[0112] In addition, the first end of the seventh transistor P3 is used to connect to the power supply, the second end of the seventh transistor P3 is connected to the first end of the eighth transistor P4, the second end of the eighth transistor P4 is connected to the second end of the fifth transistor N3 and the first end of the sixth transistor N4, the second end of the sixth transistor N4 is grounded, and the first end of the fifth transistor N3 is connected to the branch where the switching module and the compensation point are located.

[0113] Furthermore, in the third temperature range, the fifth transistor N3, the sixth transistor N4, the seventh transistor P3, and the eighth transistor P4 are in an on state, and the second temperature compensation module 20 outputs the second compensation signal to the compensation node via the fifth transistor N3. In the first temperature range and the second temperature range, no current is output to the compensation node via the fifth transistor N3, which is equivalent to the fifth transistor N3 being in an off state.

[0114] Optionally, the fifth transistor N3 and the sixth transistor N4 are third-type transistors, the seventh transistor P3 and the eighth transistor P4 are fourth-type transistors, and the seventh transistor P3 and the eighth transistor P4 are fourth-type transistors different from the third-type transistors. For example, the third-type transistor is an NMOS transistor, and the fourth-type transistor is a PMOS transistor.

[0115] like Figure 3 and Figure 4As shown, the first positive temperature coefficient power supply A1 is used to output a first positive temperature coefficient current to the first transistor P1 and the second transistor P2, and the first zero temperature coefficient power supply B1 is used to output a first zero temperature coefficient current to the third transistor N1 and the fourth transistor N2, wherein the magnitudes of the first positive temperature coefficient current and the first zero temperature coefficient current can be set as needed.

[0116] The second positive temperature coefficient power supply A2 is used to output a second positive temperature coefficient current to the seventh transistor N3 and the eighth transistor N4, and the second zero temperature coefficient power supply B2 is used to output a second zero temperature coefficient current to the fifth transistor P3 and the sixth transistor P4. The magnitudes of the second positive temperature coefficient current and the second zero temperature coefficient current can be set as needed.

[0117] In the first temperature interval (t0-t1], the first positive temperature coefficient current is output to the first transistor P1 and the second transistor P2, and the first zero temperature coefficient current is output to the third transistor N1 and the fourth transistor N2, so that the first transistor P1, the second transistor P2, the third transistor N1, and the fourth transistor N2 are in the on state. According to the first positive temperature coefficient current, the first zero temperature coefficient current, and the inherent coefficients of the first transistor P1, the second transistor P2, the third transistor N1, and the fourth transistor N2, the magnitude of the current IP2 flowing through the second transistor P2 and the magnitude of the current IN2 flowing through the fourth transistor N2 can be calculated.

[0118] like Figure 4 As shown, the current IP2 flowing through the second transistor P2 is positively correlated with temperature. Within the corresponding target temperature range, IP2 increases with increasing temperature. The current IN2 flowing through the fourth transistor N2 is independent of temperature and does not change with temperature.

[0119] Furthermore, based on the fact that IN2>IP2 in the first temperature interval (t0-t1], it can be seen that the fourth transistor N2 is in a saturated state, and the compensation current output by the first temperature compensation module 10 to the compensation node D can be regarded as the current IN1 flowing through the third transistor N1. According to Kirchhoff's law, IN1=IN2-|IP2|, that is, in the first temperature interval (t0-t1], the compensation current output by the first temperature compensation module 10 to the compensation node D is the difference between the current IN2 flowing through the fourth transistor N2 and the absolute value of the current |IP2| flowing through the second transistor P2.

[0120] In the first temperature range (t0-t1], as the temperature increases, IP2 increases and IN2 remains unchanged, so IN1 decreases. That is, in the first temperature range (t0-t1], as the temperature increases, the compensation current output by the first temperature compensation module 10 to the compensation node D gradually decreases. That is, the compensation current (IN1) output by the first temperature compensation module 10 to the compensation node D is negatively correlated with the temperature.

[0121] At the same time, within the first temperature range (t0-t1), according to the second positive temperature coefficient current, the second zero temperature coefficient current, and the intrinsic coefficients of the fifth transistor P3, the sixth transistor P4, the seventh transistor N3, and the eighth transistor N4, the current IP4 flowing through the sixth transistor P4 and the current IN4 flowing through the eighth transistor N4 can be calculated.

[0122] The current IN4 flowing through the eighth transistor N4 is positively correlated with temperature and increases with increasing temperature within the corresponding target temperature range. The current IP4 flowing through the sixth transistor P4 is independent of temperature and does not change with temperature.

[0123] In the first temperature range (t0-t1), IP4≥IN4, indicating that the eighth transistor N4 is in a saturated state, the seventh transistor P3 and the eighth transistor P4 enter the linear region, and IP4 is configured to be equal to IN4, so that the current IN3 flowing through the seventh transistor N3 is equal to zero. That is, no current is output to the compensation node through the seventh transistor N3. Therefore, the compensation signal (compensation current) output by the second temperature compensation module 20 to the compensation node D in the first temperature range is zero.

[0124] Similarly, if Figure 4 As shown, in the second temperature range (t1-t2), the current IP2 flowing through the second transistor P2 is greater than or equal to the current IN2 flowing through the fourth transistor N2. Since the magnitude of IP2 is positively correlated with temperature, the magnitude of IN2 is independent of temperature.

[0125] It can be seen from IP2≥IN2 that the fourth transistor N2 is in a saturated state, IP2 is configured to be equal to IN2, so that the current IN1 flowing through the third transistor N1 is equal to zero. At this time, it can be regarded as the third transistor N1 is disconnected, that is, no current is output to the compensation node through the third transistor N1, so the compensation signal (compensation current) output by the first temperature compensation module 20 to the compensation node D in the second temperature range is zero.

[0126] At the same time, within the second temperature range (t1-t2), the current IP4 flowing through the sixth transistor P4 is greater than or equal to the current IN4 flowing through the eighth transistor N4. Since IP4≥IN4, it can be seen that the seventh transistor P3 and the eighth transistor P4 enter the linear region, the eighth transistor N4 is in a saturation state, and IP4 is configured to be equal to IN4, so that the current IN3 flowing through the seventh transistor N3 is equal to zero. At this time, it can be regarded as the seventh transistor N3 being disconnected, that is, no current is output to the compensation node through the seventh transistor N3. Therefore, the compensation signal (compensation current) output by the second temperature compensation module 20 to the compensation node D in the second temperature range is zero.

[0127] Similarly, if Figure 4 As shown, in the third temperature range [t2-t3), the current IP2 flowing through the second transistor P2 is greater than or equal to the current IN2 flowing through the fourth transistor N2. Since the magnitude of IP2 is positively correlated with temperature, the magnitude of IN2 is independent of temperature.

[0128] It can be seen from IP2≥IN2 that the fourth transistor N2 is in a saturated state, the first transistor P1 and the second transistor P2 enter the linear region, and IP2 is configured to be equal to IN2, so that the current IN1 flowing through the third transistor N1 is equal to zero. At this time, it can be regarded as the third transistor N1 is disconnected, that is, no current passes through the third transistor N1 and is output to the compensation node. Therefore, the compensation signal (compensation current) output by the first temperature compensation module 20 to the compensation node D in the third temperature range is zero.

[0129] At the same time, within the third temperature interval [t2-t3), the current IP4 flowing through the sixth transistor P4 is less than the current IN4 flowing through the eighth transistor N4. Since IN4 ≥ IP4, it can be seen that the eighth transistor N4 is in a saturated state, and the compensation current output by the second temperature compensation module 20 to the compensation node D can be regarded as the current IN3 flowing through the seventh transistor N3. According to Kirchhoff's law, IN3 = IN4 - |IP4|, that is, within the third temperature interval [t2-t3), the compensation current output by the second temperature compensation module 10 to the compensation node D is the difference between the absolute values ​​of the current IN4 flowing through the eighth transistor N4 and the current IP4 flowing through the sixth transistor P4.

[0130] In the third temperature interval [t2-t3), as the temperature increases, IP4 remains unchanged and IN4 increases, and IN3 increases. That is, in the third temperature interval [t2-t3), as the temperature increases, the compensation current output by the second temperature compensation module 20 to the compensation node D gradually increases. That is, the compensation current (IN3) output by the second temperature compensation module 20 to the compensation node D is positively correlated with the temperature.

[0131] See also Figure 3 and Figure 5Typically, in the third temperature range, only the second temperature compensation module 20 needs to output the second compensation signal to the compensation node. At this time, the compensation signal is positively correlated with the temperature, and the second correlation is shown as a straight line X1.

[0132] However, in the third temperature range, when the field effect transistor threshold voltage (also called threshold voltage) VTH corresponding to the third transistor N1 of the first temperature compensation module 10 is less than the preset value, for example, the field effect transistor threshold voltage corresponding to the third transistor N1 in the third temperature range is less than the field effect transistor threshold voltage corresponding to the third transistor N1 in the first temperature range, at this time, the third transistor N1, which should have been in a saturated state, will be turned on, so that part of the compensation current will be output to the compensation node through the third transistor N1 in the third temperature range. At this time, since the first temperature compensation module 10 outputs a compensation signal to the compensation node, the second correlation between the compensation signal and the temperature becomes as shown in curve X2, thereby affecting the accuracy of the compensation signal output by the temperature compensation circuit in the third temperature range.

[0133] In the present application, the first temperature compensation module 10 and the second temperature compensation module 20 are connected through a switch module, and within the first temperature range, the switch module conducts the connection path between the first temperature compensation module 10 and the second temperature compensation module 20, and at least within the third temperature range, the switch module 30 is controlled to disconnect the connection path between the first temperature compensation module 10 and the second temperature compensation module 20, so that the third transistor N1 cannot be turned on, and the current passing through the third transistor N1 cannot be output to the compensation node, thereby ensuring that in the third temperature range, only the second temperature compensation module 20 provides a compensation signal to the compensation node, so as to effectively avoid the first temperature compensation module 10 outputting a compensation signal to the compensation node in the third temperature range, affecting the accuracy of the compensation signal output by the temperature compensation circuit 100 to the compensation node in the third temperature range, thereby improving the accuracy and reliability of the compensation signal output by the temperature compensation circuit 100 to the compensation node, and thus achieving higher-precision temperature compensation.

[0134] In some embodiments, the switch module 30 is also used to disconnect the connection path between the first temperature compensation module 10 and the second temperature compensation module 10 within the second temperature range. Exemplarily, the switch module 30 has an on state and an off state, and can switch between the on state and the off state.

[0135] When the temperature is in the first temperature range, the switch module 30 is controlled to switch to the on state so that the first temperature compensation module 10 is connected to the second temperature compensation module 20, and the compensation current output by the first temperature compensation module 10 can flow to the compensation node through the second temperature compensation module 20.

[0136] When the temperature is in at least one of the second temperature range and the third temperature range, the switch module 30 is controlled to switch to the off state so that the first temperature compensation module 10 is disconnected from the second temperature compensation module 20, so that in the corresponding second temperature range and the third temperature range, the first temperature compensation module 10 will not affect the size of the compensation signal output by the second temperature compensation module 20 to the compensation node, thereby achieving higher-precision temperature compensation.

[0137] In some embodiments, the switch module 30 includes a switch tube K1, a first end of the switch tube K1 is connected to the first temperature compensation module 10, and a second end of the switch tube K1 is connected to the second temperature compensation module 20. The controlled end of the switch tube K1 is used to receive a control signal to conduct the connection path between the first temperature compensation module 10 and the second temperature compensation module 20 within a first temperature range, and to disconnect the connection path between the first temperature compensation module 10 and the second temperature compensation module 20 within a third temperature range.

[0138] like Figure 3 As shown, the first end of the switch tube K1 is connected to the first zero temperature compensation unit of the first temperature compensation module 10 , and the second end of the switch tube K1 is connected to the second positive temperature compensation unit of the second temperature compensation module 20 .

[0139] Optionally, the switch tube K1 is a MOS tube, and the first end of the MOS tube is the source of the MOS tube, and the second end of the MOS tube is the drain of the MOS tube.

[0140] Preferably, the switch tube K1 is an NMOS tube. Since the on-resistance Ron of the NMOS tube is very small compared to the resistance of the voltage divider unit 402, and the VDS voltage drop generated is also very small, not more than 10mV (for example: 2mV, 3mV, 5mV or 7mV, etc.); therefore, the accuracy and reliability of the compensation signal output by the temperature compensation circuit 100 to the compensation node can be better improved, thereby achieving higher-precision temperature compensation.

[0141] See also Figure 6 In some embodiments, the temperature compensation circuit 100 further includes a switch control module 60, which is connected to the switch module 30 and is used to control the switch module 30 to be closed within a first temperature range to open a connection path between the first temperature compensation module 10 and the second temperature compensation module 20, and to control the switch module 30 to be opened within a third temperature range to disconnect the connection path between the first temperature compensation module 10 and the second temperature compensation module 20.

[0142] Exemplarily, the switch control module 60 includes a comparator 601, a first control transistor 602, and a second control transistor 603. A first terminal of the first control transistor 602 is connected to a first terminal of the comparator 601 and is configured to receive a first signal Ibias1. A second terminal of the first control transistor 602 is grounded. A controlled terminal of the first control transistor 602 is connected to a first terminal of the second control transistor 603. The first terminal of the second control transistor 603 is also configured to receive a second signal Ibias2. A second terminal of the second control transistor 603 is grounded, and the controlled terminal of the second control transistor 603 is grounded. A second terminal of the comparator 601 is configured to receive a predetermined electrical signal, such as a voltage signal VBG.

[0143] Optionally, the first terminal of the comparator 601 is a non-inverting input terminal, and the second terminal of the comparator 601 is an inverting input terminal. Optionally, the first control transistor 602 and the second control transistor 603 are the same type of switching transistors, for example, the first control transistor 602 and the second control transistor 603 are both PNP transistors or NPN transistors.

[0144] For example, the following description is made by taking the example that the first control transistor 602 and the second control transistor 603 are both PNP transistors.

[0145] The first signal Ibias1 and the second signal Ibias2 are zero temperature coefficient bias currents. The first control tube 602 and the second control tube 603 form a composite PNP tube, wherein the second control tube 603 is an emitter follower connection.

[0146] The controlled end of the first control tube 602 is connected to node 1 of the first end of the second control tube 603, and the voltage at node 1 is VBE1. The first end of the first control tube 602 is connected to node 2 of the first end of the comparator 601, and the voltage at node 2 is VBE2. Both VBE1 and VBE2 have negative temperature coefficients. At room temperature (e.g., 25°C), typically, VBE1≈0.7V, and VBE2≈2*VBE1=1.4V.

[0147] When the ambient temperature is within the first temperature range, such as when the temperature T is less than t1, VBE2 is greater than VBG. After passing through the comparator 601, the output terminal of the comparator 601 outputs a high level, and the switch control module 60 controls the switch tube K1 of the switch module 30 to be turned on, thereby putting the switch module 30 in the on state.

[0148] When the ambient temperature is in the second temperature range and the third temperature range, that is, when the temperature is greater than the threshold temperature, such as the threshold temperature is t1, the output end of the comparator 601 outputs a low level, controlling the switch tube K1 to be cut off, thereby turning off the switch module 30.

[0149] It can be understood that the specific implementation of the switch control module 60 can also have a variety of circuit structures, as long as the switch control module 60 can output a corresponding high level or low level according to the control signal, thereby realizing the control of the on and off of the switch tube K1 in the switch module 30.

[0150] See also Figures 7 and 8 In some embodiments, the temperature compensation circuit 100 includes at least two first temperature compensation modules 10, and at least some of the first temperature compensation modules 10 include a first switch, which is used to adjust the number of first temperature compensation modules 10 connected to the temperature compensation circuit 100.

[0151] When the number of first temperature compensation modules 10 connected to the temperature compensation circuit 100 increases, the compensation signal value corresponding to the first compensation signal increases; when the number of first temperature compensation modules 10 connected to the temperature compensation circuit 100 decreases, the compensation signal value corresponding to the first compensation signal decreases.

[0152] Optionally, the temperature compensation circuit 100 includes at least two second temperature compensation modules 20 , and at least some of the second temperature compensation modules 20 include a second switch, and the second switch is used to adjust the number of the second temperature compensation modules 20 connected to the temperature compensation circuit 100 .

[0153] When the number of second temperature compensation modules 20 connected to the temperature compensation circuit 100 increases, the compensation signal value corresponding to the second compensation signal increases; when the number of second temperature compensation modules 20 connected to the temperature compensation circuit 100 decreases, the compensation signal value corresponding to the second compensation signal decreases.

[0154] like Figure 7 As shown, the temperature compensation circuit 100 includes two first temperature compensation modules 10 and two second temperature compensation modules 20, wherein each first temperature compensation module 10 includes a corresponding first switch, and each second temperature compensation module 20 includes a corresponding second switch. For ease of distinction, one first temperature compensation module 10 is labeled 10a, and the first switch in the first temperature compensation module 10a is K2. Another first temperature compensation module 10 is labeled 10b, and the first switch in the first temperature compensation module 10b is K3. One second temperature compensation module 20 is labeled 20a, and the second switch in the second temperature compensation module 20a is K4. Another second temperature compensation module 10 is labeled 20b, and the second switch in the second temperature compensation module 20b is K5.

[0155] For example, the first temperature compensation module 10a is connected to the first positive temperature coefficient power supply A1 and the first zero temperature coefficient power supply B1 by closing the corresponding first switch K2. And / or, the first temperature compensation module 10b is connected to the first positive temperature coefficient power supply A1 and the first zero temperature coefficient power supply B1 by closing the corresponding first switch K2.

[0156] Similarly, by disconnecting the corresponding first switch K2, the first temperature compensation module 10a is disconnected from the first positive temperature coefficient power supply A1 and the first zero temperature coefficient power supply B1. By disconnecting the corresponding first switch K3, the first temperature compensation module 10b is disconnected from the first positive temperature coefficient power supply A1 and the first zero temperature coefficient power supply B1.

[0157] Exemplarily, by closing the corresponding second switch K4, the second temperature compensation module 20a is connected to the second positive temperature coefficient power supply A2 and the second zero temperature coefficient power supply B2, and / or, by closing the corresponding second switch K5, the second temperature compensation module 20b is connected to the second positive temperature coefficient power supply A2 and the second zero temperature coefficient power supply B2.

[0158] Similarly, by disconnecting the corresponding second switch K4, the second temperature compensation module 20a is disconnected from the second positive temperature coefficient power supply A2 and the second zero temperature coefficient power supply B2, and / or, by disconnecting the corresponding second switch K5, the second temperature compensation module 20b is disconnected from the second positive temperature coefficient power supply A2 and the second zero temperature coefficient power supply B2.

[0159] Since each temperature compensation circuit can output a corresponding compensation signal to the compensation node in the corresponding target temperature range, the size of the first compensation signal output by the temperature compensation circuit 100 to the compensation node is changed by changing the number of first temperature compensation modules 10 connected to the temperature compensation circuit 100, and the size of the second compensation signal output by the temperature compensation circuit 100 to the compensation node is changed by changing the number of second temperature compensation modules 20 connected to the temperature compensation circuit 100.

[0160] Furthermore, the number of first temperature compensation modules 10 connected to the temperature compensation circuit 100 is positively correlated with the magnitude of the first compensation signal output to the compensation node by the temperature compensation circuit 100. The number of second temperature compensation modules 10 connected to the temperature compensation circuit 100 is positively correlated with the magnitude of the second compensation signal output to the compensation node by the temperature compensation circuit 100.

[0161] In some embodiments, by adding the first temperature compensation module 10 connected to the temperature compensation circuit 100, the change in the first compensation signal per unit time in the first correlation increases; by reducing the first temperature compensation module 10 connected to the temperature compensation circuit 100, the change in the first compensation signal per unit time in the first correlation decreases.

[0162] By increasing the second temperature compensation module 20 connected to the temperature compensation circuit 100, the change of the second compensation signal per unit time in the second correlation increases, and by reducing the second temperature compensation module 20 connected to the temperature compensation circuit 100, the change of the second compensation signal per unit time in the second correlation decreases.

[0163] like Figure 8 As shown, when only the first temperature compensation module 10a is connected to the temperature compensation circuit 100, the corresponding first correlation is the line segment corresponding to K2. When only the first temperature compensation module 10b is connected to the temperature compensation circuit 100, the corresponding first correlation is the line segment corresponding to K3. When both the first temperature compensation module 10a and the first temperature compensation module 10b are connected to the temperature compensation circuit 100, the corresponding first correlation is the line segment corresponding to K2+K3. The change in the first compensation signal per unit time in the line segment corresponding to K2+K3 is greater than the change in the first compensation signal per unit time in the line segment corresponding to K2 or K3.

[0164] When only the second temperature compensation module 20a is connected to the temperature compensation circuit 100, the corresponding second correlation is the line segment corresponding to K4. When only the second temperature compensation module 20b is connected to the temperature compensation circuit 100, the corresponding second correlation is the line segment corresponding to K5. When both the second temperature compensation module 20a and the second temperature compensation module 20b are connected to the temperature compensation circuit 100, the corresponding second correlation is the line segment corresponding to K4+K5. The change in the second compensation signal per unit time in the line segment corresponding to K4+K5 is greater than the change in the second compensation signal per unit time in the line segment corresponding to K4 or K5.

[0165] See also Figure 3 and Figure 9 The power module 40 includes an operational amplifier 401 and a voltage divider 402. The first terminal of the operational amplifier 401 is connected to the output terminal of the operational amplifier 401. The output terminal of the amplifier 401 is also connected to the first terminal of the voltage divider 402. The second terminal of the voltage divider 402 is connected to the compensation node or the path where the compensation node is located. The second terminal of the operational amplifier 401 is configured to receive a predetermined electrical signal, such as the voltage signal VBG. Optionally, the voltage divider 402 includes, but is not limited to, a resistor.

[0166] The preset electrical signal VBG is a constant value, the resistance of the voltage divider unit 402 is R, the potential of point C in the power module 40 is VBG, and the voltage value at the compensation node is VOUT. Therefore, VOUT = VBG - IOUT * R, where IOUT is the current input to the compensation node by the temperature compensation circuit.

[0167] Therefore, in the first temperature range, IOUT decreases as temperature increases, so VOUT increases with temperature, and VOUT has a positive temperature coefficient. In the second temperature range, IOUT is zero, and VOUT = VBG. In the third temperature range, IOUT increases as temperature increases, so VOUT decreases with temperature, and VOUT has a negative temperature coefficient.

[0168] See also Figure 10 , Figure 10 This is a schematic diagram of the circuit structure provided in the second embodiment of the present application.

[0169] like Figure 10 As shown, the difference from the first embodiment is that the temperature compensation circuit 100 does not include the switch module 30, and the first temperature compensation module 10 is connected to the second temperature compensation module 20. That is, the temperature compensation circuit 100 includes at least one first temperature compensation module 10, at least one second temperature compensation module 20, and a power module 40.

[0170] The first temperature compensation module 10 is connected to the second temperature compensation module 20. The first temperature compensation module 10 is configured to output a first compensation signal to a compensation node within a first temperature range, wherein the first compensation signal has a first correlation with temperature. The second temperature compensation module 20 is configured to output a second compensation signal to the compensation node within a third temperature range, wherein the second compensation signal has a second correlation with temperature. Furthermore, the compensation signals output by the first and second temperature compensation modules 10 and 20 within the second temperature range are independent of temperature, and the second temperature range is between the first and third temperature ranges. In the first correlation, the magnitude of the first compensation signal is negatively correlated with temperature, while in the second correlation, the magnitude of the second compensation signal is positively correlated with temperature.

[0171] Exemplarily, the first temperature compensation module 10 is also used to receive a first positive temperature coefficient current and a first zero temperature coefficient current. The first positive temperature coefficient current and the first zero temperature coefficient current can enable the first temperature compensation module 10 to output a first compensation signal to the compensation node within the first temperature range.

[0172] The second temperature compensation module 20 is further configured to receive a second positive temperature coefficient current and a second zero temperature coefficient current. The second positive temperature coefficient current and the second zero temperature coefficient current enable the second temperature compensation module 20 to output a second compensation signal to the compensation node within a third temperature range.

[0173] Furthermore, the first temperature compensation module 10 includes a first positive temperature compensation unit 101 and a first zero temperature compensation unit 102 connected to the first positive temperature compensation unit 101, the first positive temperature compensation unit 101 is used to receive a first positive temperature coefficient current, and the first zero temperature compensation unit 102 is used to receive a first zero temperature coefficient current; in the first temperature range, the first temperature compensation module 10 outputs a first compensation signal to the compensation node after receiving the first positive temperature coefficient current and the first zero temperature coefficient current.

[0174] The second temperature compensation module 20 includes a second positive temperature compensation unit 201 and a second zero temperature compensation unit 202 connected to the second positive temperature compensation unit 201, the second positive temperature compensation unit 201 is used to receive a second positive temperature coefficient current, and the second zero temperature compensation unit 202 is used to receive a second zero temperature coefficient current; in the third temperature range, the second temperature compensation module 20 outputs a second compensation signal to the compensation node after receiving the second positive temperature coefficient current and the second zero temperature coefficient current.

[0175] like Figure 10 As shown, the second embodiment is Figure 3 The embodiment in is different in that, Figure 3 In the embodiment, the first temperature compensation module 10 and the second temperature compensation module 20 are connected via the switch module 30 . In this embodiment, there is no switch module 30 , and the first temperature compensation module 10 is connected to the second temperature compensation module 20 .

[0176] The first positive temperature compensation unit 101 includes a first transistor P1 and a second transistor P2, and the first zero temperature compensation unit 102 includes a third transistor N1 and a fourth transistor N2, wherein the controlled ends of the first transistor P1 and the second transistor P2 are used to connect to a first positive temperature coefficient power supply, and the first positive temperature coefficient power supply is used to output a first positive temperature coefficient current; the controlled ends of the third transistor N1 and the fourth transistor N2 are used to connect to a first zero temperature coefficient power supply, and the first zero temperature coefficient power supply is used to output a first zero temperature coefficient current.

[0177] In addition, the first end of the first transistor P1 is used to connect to the power supply, the second end of the first transistor P1 is connected to the first end of the second transistor P2, the second end of the second transistor P2 is connected to the second end of the third transistor N1 and the first end of the fourth transistor N2, the second end of the fourth transistor N2 is grounded, and the first end of the third transistor N1 is connected to the branch where the compensation point is located.

[0178] In the first temperature range, the first transistor P1, the second transistor P2, the third transistor N1, and the fourth transistor N2 are in the on state, and the first temperature compensation module 10 outputs the first compensation signal to the compensation node through the third transistor N1; in the second temperature range and the third temperature range, the third transistor N1 is in the off state.

[0179] The second positive temperature compensation unit 201 includes a seventh transistor N3 and an eighth transistor N4, and the second zero temperature compensation unit 202 includes a fifth transistor P3 and a sixth transistor P4, wherein the controlled ends of the fifth transistor P3 and the sixth transistor P4 are used to be connected to a second zero temperature coefficient power supply, and the second zero temperature coefficient power supply is used to output a second zero temperature coefficient current; the controlled ends of the seventh transistor N3 and the eighth transistor N4 are used to be connected to a second positive temperature coefficient power supply, and the second positive temperature coefficient power supply is used to output a second positive temperature coefficient current;

[0180] In addition, the first end of the seventh transistor N3 is used to connect to the power supply, the second end of the seventh transistor N3 is connected to the first end of the eighth transistor N4, the second end of the eighth transistor N4 is connected to the second end of the fifth transistor P3 and the first end of the sixth transistor P4, the second end of the sixth transistor P4 is grounded, and the first end of the fifth transistor P3 is connected to the branch where the compensation point is located.

[0181] In the third temperature range, the fifth transistor P3, the sixth transistor P4, the seventh transistor N3, and the eighth transistor N4 are in the on state, and the second temperature compensation module 20 outputs the second compensation signal to the compensation node via the seventh transistor N3. In the first and second temperature ranges, the seventh transistor N3 is in the off state.

[0182] In the second embodiment, the functions and working principles corresponding to the same circuit structure in the temperature compensation circuit can be found in the relevant description of the temperature compensation circuit in the first embodiment, which will not be repeated here.

[0183] See also Figure 11 , Figure 11 This is a schematic diagram of the circuit structure provided in the third embodiment of the present application.

[0184] like Figure 11 As shown, the temperature compensation circuit 100 includes at least one first temperature compensation module 10 , at least one second temperature compensation module 20 and a power supply module 40 .

[0185] The first temperature compensation module 10 is connected to the second temperature compensation module 20. The first temperature compensation module 10 is configured to output a first compensation signal to a compensation node within a first temperature range, wherein the first compensation signal has a first correlation with temperature. The second temperature compensation module 20 is configured to output a second compensation signal to the compensation node within a third temperature range, wherein the second compensation signal has a second correlation with temperature. Furthermore, the compensation signals output by the first and second temperature compensation modules 10 and 20 within the second temperature range are independent of temperature, and the second temperature range is between the first and third temperature ranges. In the first correlation, the magnitude of the first compensation signal is negatively correlated with temperature, while in the second correlation, the magnitude of the second compensation signal is positively correlated with temperature.

[0186] Exemplarily, the first temperature compensation module 10 is also used to receive a first positive temperature coefficient current and a first zero temperature coefficient current. The first positive temperature coefficient current and the first zero temperature coefficient current can enable the first temperature compensation module 10 to output a first compensation signal to the compensation node within the first temperature range.

[0187] The second temperature compensation module 20 is further configured to receive a second positive temperature coefficient current and a second zero temperature coefficient current. The second positive temperature coefficient current and the second zero temperature coefficient current enable the second temperature compensation module 20 to output a second compensation signal to the compensation node within a third temperature range.

[0188] Furthermore, the first temperature compensation module 10 includes a first positive temperature compensation unit 101 and a first zero temperature compensation unit 102 connected to the first positive temperature compensation unit 101, the first positive temperature compensation unit 101 is used to receive a first positive temperature coefficient current, and the first zero temperature compensation unit 102 is used to receive a first zero temperature coefficient current; in the first temperature range, the first temperature compensation module 10 outputs a first compensation signal to the compensation node after receiving the first positive temperature coefficient current and the first zero temperature coefficient current.

[0189] The second temperature compensation module 20 includes a second positive temperature compensation unit 201 and a second zero temperature compensation unit 202 connected to the second positive temperature compensation unit 201, the second positive temperature compensation unit 201 is used to receive a second positive temperature coefficient current, and the second zero temperature compensation unit 202 is used to receive a second zero temperature coefficient current; in the third temperature range, the second temperature compensation module 20 outputs a second compensation signal to the compensation node after receiving the second positive temperature coefficient current and the second zero temperature coefficient current.

[0190] In the third embodiment, the functions and working principles corresponding to the same circuit structure in the temperature compensation circuit can be found in the relevant description of the temperature compensation circuit in the second embodiment, which will not be repeated here.

[0191] The third embodiment differs from the second embodiment in that, optionally, the first positive temperature compensation unit 101 includes a first transistor N1 and a second transistor N2, and the first zero temperature compensation unit 102 includes a third transistor P1 and a fourth transistor P2, wherein the controlled ends of the first transistor N1 and the second transistor N2 are used to be connected to a first positive temperature coefficient power supply A1, and the first positive temperature coefficient power supply A1 is used to output a first positive temperature coefficient current; the controlled ends of the third transistor P1 and the fourth transistor P2 are used to be connected to a first zero temperature coefficient power supply B1, and the first zero temperature coefficient power supply B1 is used to output a first zero temperature coefficient current.

[0192] In addition, the first end of the third transistor P1 is used to connect to the power supply VDD, the second end of the third transistor P1 is connected to the first end of the fourth transistor P2 and the first end of the first transistor N1, the second end of the fourth transistor P2 is connected to the branch where the compensation point is located; the second end of the first transistor N1 is connected to the first end of the second transistor N2, and the second end of the second transistor N2 is grounded.

[0193] Optionally, the second positive temperature compensation unit 201 includes a fifth transistor P3 and a sixth transistor P4, and the second zero temperature compensation unit 202 includes a seventh transistor N3 and an eighth transistor N4, wherein the controlled ends of the fifth transistor P3 and the sixth transistor P4 are used to be connected to the second positive temperature coefficient power supply A2, and the second positive temperature coefficient power supply A2 is used to output a second positive temperature coefficient current; the controlled ends of the seventh transistor N3 and the eighth transistor N4 are used to be connected to the second zero temperature coefficient power supply B2, and the second zero temperature coefficient power supply B2 is used to output a second zero temperature coefficient current.

[0194] In addition, the first end of the fifth transistor P3 is used to connect to the power supply VDD, the second end of the fifth transistor P3 is connected to the first end of the sixth transistor P4 and the first end of the seventh transistor N3, the second end of the sixth transistor P4 is connected to the branch where the compensation point is located; the second end of the seventh transistor N3 is connected to the first end of the eighth transistor N4, and the second end of the eighth transistor N4 is grounded.

[0195] like Figure 12 As shown, after the first positive temperature compensation unit 101 receives the first positive temperature coefficient current and the first zero temperature compensation unit 102 receives the first zero temperature coefficient current, the current flowing through the first transistor N1 is IN1, and the magnitude of IN1 is positively correlated with the temperature. The current flowing through the third transistor P1 is IP1, and the magnitude of IP1 is independent of the temperature.

[0196] After the second positive temperature compensation unit 201 receives the second positive temperature coefficient current and the second zero temperature compensation unit 202 receives the second zero temperature coefficient current, the current flowing through the fifth transistor P3 is IP3, and the magnitude of IP3 is positively correlated with the temperature. The current flowing through the seventh transistor N3 is IN3, and the magnitude of IN3 is independent of the temperature.

[0197] In the first temperature range (t0-t1), IP1>IN1, the first transistor N1, the second transistor N2, the third transistor P1 and the fourth transistor P2 are in the on state, and the current output by the first positive temperature compensation module 10 to the compensation node through the fourth transistor P2 is IOUT, IOUT=|IP2|=|IP1|-IN1, |IP1| does not change with temperature, IN1 increases with increasing temperature, so IOUT decreases with increasing temperature, that is, IOUT is negatively correlated with temperature.

[0198] At this time, the voltage of the compensation node is VOUT, VOUT=VBG+IOUT*R, VOUT decreases as the temperature increases, and VOUT is a negative temperature coefficient voltage.

[0199] In the first temperature range (t0-t1), IN3≥IP3, the sixth transistor P4 is in a saturated state, the seventh transistor N3 and the eighth transistor N4 enter the linear region, so that the current IP4 flowing through the sixth transistor P4 is equal to zero, that is, no current is output to the compensation node through the sixth transistor P4, and the sixth transistor P4 can be regarded as being in a closed state. Therefore, the compensation signal (compensation current) output by the second temperature compensation module 20 to the compensation node D in the first temperature range is zero.

[0200] Similarly, within the second temperature range (t1-t2), IN3≥IP3, the sixth transistor P4 is in a saturated state, so that the current IP4 flowing through the sixth transistor P4 is equal to zero, that is, no current is output to the compensation node through the sixth transistor P4, and the sixth transistor P4 can be regarded as being in a closed state. Therefore, the compensation signal (compensation current) output by the second temperature compensation module 20 to the compensation node D in the second temperature range is zero.

[0201] In the second temperature range, IP1≤IN1, the fourth transistor P2 is in the cut-off state, so that the current IP2 of the fourth transistor P2 is equal to zero, that is, no current is output to the compensation node through the fourth transistor P2, and the fourth transistor P2 can be regarded as being in the off state. Therefore, the compensation signal (compensation current) output by the first temperature compensation module 10 to the compensation node D in the second temperature range is zero.

[0202] Similarly, in the third temperature range [t2-t3), IP1<IN1, the fourth transistor P2 is in the cut-off state, so that the current IP2 of the fourth transistor P2 is equal to zero, that is, no current passes through the fourth transistor P2 and is output to the compensation node. It can be regarded as that the fourth transistor P2 is in the off state, so the compensation signal (compensation current) output by the first temperature compensation module 10 to the compensation node D in the third temperature range is zero.

[0203] In the third temperature range, IN3<IP3, the current |IP3| flowing through P3 is greater than the current IN3 flowing through N3, the fifth transistor P3, the sixth transistor P4, the seventh transistor N3, and the eighth transistor N4 are in the on state, and the current output by the second positive temperature compensation module 20 to the compensation node through the sixth transistor P4 is IOUT, IOUT=|IP4|=|IP3|-IN3, |IP3| increases with increasing temperature, IN3 does not change with temperature, so IOUT increases with increasing temperature.

[0204] At this time, the voltage of the compensation node is VOUT, VOUT=VBG+IOUT*R, VOUT increases as the temperature rises, and VOUT is a positive temperature coefficient voltage.

[0205] In some embodiments, the voltage at the compensation node D can be adjusted by adjusting the resistance of the voltage divider unit 402 in the power module 40. For example, the voltage divider unit 402 is provided with an adjustable resistor, and the voltage at the compensation node D is adjusted by adjusting the resistance of the adjustable resistor. Alternatively, the voltage divider unit 402 is provided with a switch and a resistor, and the number of resistors connected to the voltage divider unit 402 is controlled by turning the switch on or off, thereby achieving adjustable resistance of the voltage divider unit 402.

[0206] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0207] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A temperature compensation circuit, characterized in that: Used to provide a compensation signal to the target circuit, the temperature compensation circuit includes at least one first temperature compensation module, at least one second temperature compensation module and a switch module connecting the first temperature compensation module and the second temperature compensation module; The first temperature compensation module is used to output a first compensation signal to the compensation node within a first temperature range, and the first compensation signal has a first correlation with the temperature; The second temperature compensation module is configured to output a second compensation signal to the compensation node within a third temperature range, the second compensation signal has a second correlation with the temperature, and a minimum value of the third temperature range is greater than a maximum value of the first temperature range; Furthermore, the compensation signals output by the first temperature compensation module and the second temperature compensation module in a second temperature range are independent of temperature, and the second temperature range is located between the first temperature range and the third temperature range; The switch module is configured to connect the first temperature compensation module and the second temperature compensation module at least within the first temperature range, and disconnect the first temperature compensation module and the second temperature compensation module at least within the third temperature range.

2. The temperature compensation circuit according to claim 1, wherein: The switch module is further configured to disconnect the connection path between the first temperature compensation module and the second temperature compensation module within the second temperature range, or at a portion of the second temperature range and the third temperature range.

3. The temperature compensation circuit according to claim 1, wherein: The first temperature compensation module includes a first positive temperature compensation unit and a first zero temperature compensation unit connected to the first positive temperature compensation unit, the first positive temperature compensation unit is used to receive a first positive temperature coefficient current, and the first zero temperature compensation unit is used to receive a first zero temperature coefficient current; and in the first temperature range, the first temperature compensation module outputs the first compensation signal to the compensation node.

4. The temperature compensation circuit according to claim 3, wherein: The first positive temperature compensation unit includes a first transistor and a second transistor, and the first zero temperature compensation unit includes a third transistor and a fourth transistor, wherein the controlled ends of the first transistor and the second transistor are used to receive the first positive temperature coefficient current output by the first positive temperature coefficient power supply; the controlled ends of the third transistor and the fourth transistor are used to receive the first zero temperature coefficient current output by the first zero temperature coefficient power supply; In addition, the first end of the first transistor is used to connect to the power supply, the second end of the first transistor is connected to the first end of the second transistor, the second end of the second transistor is connected to the second end of the third transistor and the first end of the fourth transistor, the second end of the fourth transistor is grounded, and the first end of the third transistor is connected to the switch module and is connected to the branch where the compensation node is located through the switch module.

5. The temperature compensation circuit according to claim 4, wherein: In the first temperature range, the first transistor, the second transistor, the third transistor, and the fourth transistor are in an on state, and the first temperature compensation module outputs the first compensation signal to the compensation node via the third transistor.

6. The temperature compensation circuit according to claim 4, wherein: In the second temperature range and the third temperature range, the third transistor is in a turned-off state.

7. The temperature compensation circuit according to claim 4, wherein: The first transistor and the second transistor are first-type transistors, the third transistor and the fourth transistor are second-type transistors different from the first-type transistors, the first-type transistor is a PMOS transistor, and the second-type transistor is an NMOS transistor.

8. The temperature compensation circuit according to claim 3, wherein: The second temperature compensation module includes a second positive temperature compensation unit and a second zero temperature compensation unit connected to the second positive temperature compensation unit, the second positive temperature compensation unit is used to receive a second positive temperature coefficient current, and the second zero temperature compensation unit is used to receive a second zero temperature coefficient current; in the third temperature range, the second temperature compensation module outputs the second compensation signal to the compensation node.

9. The temperature compensation circuit according to claim 8, characterized in that: The second positive temperature compensation unit includes a fifth transistor and a sixth transistor, and the second zero temperature compensation unit includes a seventh transistor and an eighth transistor, wherein the controlled ends of the fifth transistor and the sixth transistor are used to receive the second positive temperature coefficient current output by the second positive temperature coefficient power supply; and the controlled ends of the seventh transistor and the eighth transistor are used to receive the first zero temperature coefficient current output by the first zero temperature coefficient power supply; In addition, the first end of the seventh transistor is used to connect to the power supply, the second end of the seventh transistor is connected to the first end of the eighth transistor, the second end of the eighth transistor is connected to the second end of the fifth transistor and the first end of the sixth transistor, the second end of the sixth transistor is grounded, and the first end of the fifth transistor is connected to the branch where the switching module and the compensation node are located.

10. The temperature compensation circuit according to claim 9, wherein: In the third temperature range, the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor are in an on state, and the second temperature compensation module outputs the second compensation signal to the compensation node via the seventh transistor.

11. The temperature compensation circuit according to claim 9, wherein: In the first temperature range and the second temperature range, the fifth transistor is in a turned-off state.

12. The temperature compensation circuit according to claim 1, wherein: The switch module includes a switch tube, a first end of the switch tube is connected to the first temperature compensation module, and a second end of the switch tube is connected to the second temperature compensation module. The controlled end of the switch tube is used to receive a control signal to conduct the connection path between the first temperature compensation module and the second temperature compensation module within the first temperature range, and to disconnect the connection path between the first temperature compensation module and the second temperature compensation module within the third temperature range.

13. The temperature compensation circuit according to claim 3, wherein: The switch module includes a switch tube, a first end of the switch tube is connected to the first zero temperature compensation unit of the first temperature compensation module, a second end of the switch tube is connected to the second positive temperature compensation unit of the second temperature compensation module, and a controlled end of the switch tube is used to receive a control signal.

14. The temperature compensation circuit according to claim 13, wherein: The switch tube is an NMOS tube, and the first end of the switch tube is the source of the NMOS tube, the second end of the switch tube is the drain of the NMOS tube, and the controlled end of the switch tube is the gate of the NMOS tube.

15. The temperature compensation circuit according to claim 1, wherein: The temperature compensation circuit also includes a switch control module, which is connected to the switch module and is used to output a first control signal to the switch module within the first temperature range to control the switch module to conduct the connection path between the first temperature compensation module and the second temperature compensation module; and output a second control signal to the switch module within the third temperature range to control the switch module to disconnect the connection path between the first temperature compensation module and the second temperature compensation module.

16. The temperature compensation circuit according to any one of claims 1 to 15, characterized in that: In the first correlation, the magnitude of the first compensation signal is negatively correlated with the temperature, and in the second correlation, the magnitude of the second compensation signal is positively correlated with the temperature.

17. The temperature compensation circuit according to any one of claims 1 to 15, characterized in that: The compensation signals output by the first temperature compensation module and the second temperature compensation module are zero within the second temperature range.

18. The temperature compensation circuit according to any one of claims 1 to 15, characterized in that: The temperature compensation circuit includes at least two first temperature compensation modules, and at least some of the first temperature compensation modules include a first switch, and the first switch is used to adjust the number of the first temperature compensation modules connected to the temperature compensation circuit; In the first temperature range, when the number of the first temperature compensation modules connected to the temperature compensation circuit increases, the compensation signal value corresponding to the first compensation signal increases; when the number of the first temperature compensation modules connected to the temperature compensation circuit decreases, the compensation signal value corresponding to the first compensation signal decreases; And / or, the temperature compensation circuit includes at least two second temperature compensation modules, and at least some of the second temperature compensation modules include a second switch, and the second switch is used to adjust the number of the second temperature compensation modules connected to the temperature compensation circuit; In the third temperature range, when the number of the second temperature compensation modules connected to the temperature compensation circuit increases, the compensation signal value corresponding to the second compensation signal increases; when the number of the second temperature compensation modules connected to the temperature compensation circuit decreases, the compensation signal value corresponding to the second compensation signal decreases.

19. The temperature compensation circuit according to claim 18, wherein: By increasing the number of the first temperature compensation modules connected to the temperature compensation circuit, the variation of the first compensation signal per unit time in the first correlation increases; by reducing the number of the first temperature compensation modules connected to the temperature compensation circuit, the variation of the first compensation signal per unit time in the first correlation decreases; By increasing the number of the second temperature compensation modules connected to the temperature compensation circuit, the amount of change of the second compensation signal per unit time in the second correlation increases; by reducing the number of the second temperature compensation modules connected to the temperature compensation circuit, the amount of change of the second compensation signal per unit time in the second correlation decreases.

20. The temperature compensation circuit according to any one of claims 2 to 15, characterized in that: The switch module is further configured to disconnect the connection path between the first temperature compensation module and the second temperature compensation module within the second temperature range.

21. A temperature compensation circuit, characterized in that: Used to provide a compensation signal to the target circuit, the temperature compensation circuit includes at least one first temperature compensation module, at least one second temperature compensation module and a switch module connecting the first temperature compensation module and the second temperature compensation module; The first temperature compensation module is used to output a first compensation signal to the compensation node within a first temperature range, and the first compensation signal has a first correlation with the temperature; The second temperature compensation module is configured to output a second compensation signal to the compensation node within a third temperature range, the second compensation signal has a second correlation with the temperature, and a minimum value of the third temperature range is greater than a maximum value of the first temperature range; The compensation signals output by the first temperature compensation module and the second temperature compensation module in a second temperature range are independent of temperature, and the second temperature range is between the first temperature range and the third temperature range; The switch module is configured to connect the first temperature compensation module and the second temperature compensation module when the temperature is less than or equal to a first threshold, and disconnect the first temperature compensation module and the second temperature compensation module when the temperature is greater than the first threshold; The first threshold is smaller than the maximum temperature value of the third temperature interval and larger than the maximum temperature value of the first temperature interval.

22. A temperature compensation circuit, characterized in that: Used to provide a compensation signal to the target circuit, the temperature compensation circuit includes at least one first temperature compensation module and at least one second temperature compensation module; The first temperature compensation module is used to output a first compensation signal to the compensation node within a first temperature range, and the first compensation signal has a first correlation with the temperature; The second temperature compensation module is configured to output a second compensation signal to the compensation node within a third temperature range, the second compensation signal having a second correlation with temperature, and the compensation signals output by the first temperature compensation module and the second temperature compensation module within the second temperature range are independent of temperature, the second temperature range being between the first temperature range and the third temperature range; In the first correlation, the magnitude of the first compensation signal is negatively correlated with the temperature, and in the second correlation, the magnitude of the second compensation signal is positively correlated with the temperature.

23. A power amplifier, characterized in that: The power amplifier includes a temperature compensation circuit, a bias circuit, and a power amplifier circuit as described in any one of claims 1 to 22, and the bias circuit is connected to the temperature compensation circuit and the power amplifier circuit.

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