Temperature compensation circuit, power amplifier and radio frequency front-end module

Abstract

The invention discloses a temperature compensation circuit, a power amplifier and a radio frequency front-end module, and the temperature compensation circuit comprises at least one first temperature compensation module, at least one second temperature compensation module, and an adjustment module which is connected with the first temperature compensation module and the second temperature compensation module. The adjusting module is connected with the power supply end of the power amplifier; the first temperature compensation module is used for outputting a first compensation signal to the compensation node in a first temperature interval, and the first compensation signal is in positive correlation with the temperature; the second temperature compensation module is used for outputting a second compensation signal to the compensation node in a third temperature interval, the second compensation signal is in positive correlation with the temperature, and the minimum value of the third temperature interval is larger than the maximum value of the first temperature interval; wherein the adjusting module is used for detecting the power supply voltage of the power amplifier in a first temperature interval and adjusting a first slope between the first compensation signal and the temperature according to the power supply voltage, and the power supply voltage is in positive correlation with the first slope.

Description

Technical Field

[0001] The present application relates to the field of radio frequency technology, and in particular to a temperature compensation circuit, a power amplifier and a radio frequency front-end module. Background Art

[0002] In radio frequency technology, it is usually necessary to set a power amplifier in the radio frequency front-end module for power amplification. With the development of mobile communication technology, the requirements for power amplifiers in communication systems are getting higher and higher, and gain linearity is an important performance indicator for measuring power amplifiers, which directly affects the communication quality of mobile terminals. Since the performance of the power amplifier (such as gain) is easily affected by the external temperature, in order to ensure that the power amplifier has good performance and improve the thermal stability of the power amplifier, it is crucial to perform appropriate temperature compensation on the power amplifier. Related technologies usually only perform segmented temperature compensation on the power amplifier according to changes in operating temperature, which can easily lead to poor durability of the power amplifier. Summary of the invention

[0003] The present application provides a temperature compensation circuit, a power amplifier and a radio frequency front-end module, which solve the problem of poor durability of the power amplifier when the related art performs segmented temperature compensation on the power amplifier.

[0004] In a first aspect, the present application provides a temperature compensation circuit for providing a compensation signal to a bias circuit of a power amplifier, the temperature compensation circuit comprising at least one first temperature compensation module, at least one second temperature compensation module, and an adjustment module connecting the first temperature compensation module and the second temperature compensation module, the adjustment module being connected to a power supply terminal of the power amplifier;

[0005] 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 is positively correlated with the temperature;

[0006] The second temperature compensation module is used to output a second compensation signal to the compensation node within a third temperature range, the second compensation signal is positively correlated with the temperature, and the minimum value of the third temperature range is greater than the maximum value of the first temperature range;

[0007] The regulating module is used to detect the supply voltage of the power amplifier within the first temperature range, and to adjust a first slope between the first compensation signal and temperature according to the supply voltage, and the supply voltage is positively correlated with the first slope.

[0008] In a second aspect, the present application further provides a power amplifier, which includes a bias circuit, a power amplification circuit and the above-mentioned temperature compensation circuit, wherein the bias circuit connects the temperature compensation circuit and the power amplification circuit.

[0009] In the third aspect, the present application also provides a radio frequency front-end module, which includes a power amplifier chip and a control chip, the power amplifier chip integrating a power amplifier circuit, the control chip integrating a bias circuit and a temperature compensation circuit as described above, the power amplifier chip or the control chip also integrating a bias circuit, the input end of the bias circuit is connected to the temperature compensation circuit, and the output end of the bias circuit is connected to the power amplifier circuit.

[0010] The temperature compensation circuit, power amplifier and RF front-end module provided in the embodiments of the present application detect the power supply voltage of the power amplifier within a first temperature range, and adjust the first slope between the first compensation signal and the temperature according to the power supply voltage, so that the first slope is positively correlated with the power supply voltage. When the temperature is low and the power supply voltage increases, increasing the first slope can increase the current drawn from the compensation node, thereby reducing the bias current of the input power amplifier, thereby reducing the gain of the power amplifier, and further preventing the power amplifier from burning due to excessive supply voltage in a low temperature environment, thereby improving the durability of the power amplifier.

[0011] 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

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 paying any creative work.

[0013] Figure 1 It is a schematic diagram of the circuit structure of a radio frequency front-end module provided in an embodiment of the present application;

[0014] Figure 2 It is a schematic diagram of the circuit structure of a radio frequency front-end module provided in an embodiment of the present application;

[0015] Figure 3 is a circuit structure block diagram of a power amplifier provided in an embodiment of the present application;

[0016] Figure 4 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;

[0017] Figure 5 is a circuit structure diagram of a temperature compensation circuit provided in an embodiment of the present application;

[0018] Figure 6 is another circuit structure schematic diagram of the temperature compensation circuit provided in an embodiment of the present application;

[0019] Figure 7 is another circuit structure schematic diagram of the temperature compensation circuit provided in an embodiment of the present application;

[0020] Figure 8 is another circuit structure schematic diagram of the temperature compensation circuit provided in an embodiment of the present application;

[0021] Fig. 9 is a circuit structure diagram of a voltage comparison unit provided in an embodiment of the present application;

[0022] Fig.10 is another circuit structure schematic diagram of the temperature compensation circuit provided in an embodiment of the present application;

[0023] Fig.11 is another circuit structure schematic diagram of the temperature compensation circuit provided in an embodiment of the present application;

[0024] Fig.12 is another circuit structure schematic diagram of the temperature compensation circuit provided in an embodiment of the present application;

[0025] Fig.13 This is another circuit structure schematic diagram of the temperature compensation circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0028] It should be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0029] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] See also Figure 1 , Figure 1 is a circuit structure diagram of a radio frequency front-end module 1000 provided in an embodiment of the present application, such as Figure 1 As shown, the RF front-end module 1000 includes a power amplifier chip 11 and a control chip 12 . The power amplifier chip 11 integrates a power amplifier circuit 300 , and the control chip 12 integrates a temperature compensation circuit 100 .

[0032] like Figure 1 As shown, in some embodiments, a bias circuit 200 is also integrated in the power amplifier chip 11, the input end of the bias circuit 200 is connected to the temperature compensation circuit 100, and the output end of the bias circuit 200 is connected to the power amplifier circuit 300. The temperature compensation circuit 100 is used to provide a compensation signal to the bias circuit 200.

[0033] like Figure 2 As shown, in other embodiments, a bias circuit 200 is further integrated in the control chip 12 , the input end of the bias circuit 200 is connected to the temperature compensation circuit 100 , and the output end of the bias circuit 200 is connected to the power amplifier circuit 300 .

[0034] It should be noted that the RF front-end module 1000 is a component that integrates two or more discrete devices such as RF switches, low noise amplifiers, filters, duplexers, power amplifiers, etc. into an independent module, which can improve the integration and hardware performance and make the volume miniaturized. The RF front-end module 1000 in this embodiment can support carrier aggregation, dual connectivity, and multiple input and multiple output (MIMO).

[0035] Specifically, the RF front-end module 1000 can be applied to communication devices such as smartphones, tablet computers, smart watches, and routers. Among them, the communication devices may include electronic devices such as smartphones, tablet computers, and smart watches, and may also include communication devices such as base stations and NFC (Near Field Communication) devices. The RF front-end module 1000 can receive or transmit RF signals through the antenna in the communication device, and the power amplifier 100 is used to amplify the power of the RF signal to be transmitted so that it can be transmitted through the antenna.

[0036] See also Figure 3 , Figure 3 It is a circuit structure block diagram of a power amplifier provided in an embodiment of the present application.

[0037] like Figure 3 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 used to output a compensation signal adapted to the temperature in the target temperature range to the target object in 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 a bias circuit 200. The temperature compensation circuit 100 outputs a compensation signal to a compensation node in the target temperature range. The compensation node may be a specific circuit node in the bias circuit 200, or 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 compensation signal to the bias circuit 200 through the compensation node in the target temperature range.

[0038] The bias circuit 200 is connected to the temperature compensation circuit 100 and the power amplifier circuit 300, and the bias circuit 200 is also used to receive the compensation signal output by the temperature compensation circuit 100, and output the bias signal based on the compensation signal. It can be understood that the magnitude of the bias signal output by the bias circuit 200 is related to the magnitude of the 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 compensation signal output by the temperature compensation circuit 100, that is, the larger the compensation signal output by the temperature compensation circuit 100, the larger the bias signal output by the bias circuit 200.

[0039] It should be noted that the compensation signal output by the temperature compensation circuit 100 can be a forward compensation signal or a reverse compensation signal. When the temperature compensation circuit 100 outputs a reverse compensation signal, the larger the compensation signal is, the smaller the absolute value of the compensation signal is.

[0040] The power amplifier circuit 300 is used to receive a bias signal and a radio frequency input signal, and output a radio frequency output signal. The power amplification factor of the radio frequency input signal of 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 radio frequency input signal of the power amplifier circuit 300 is positively correlated with the magnitude of the bias signal.

[0041] 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.

[0042] In some embodiments, the target temperature interval includes at least a first temperature interval and a third temperature interval. The maximum value of the first temperature interval is less than the minimum value of the third temperature interval, and the temperature compensation circuit 100 outputs a first compensation signal to the compensation node in the first temperature interval, and the first compensation signal is positively correlated with the temperature. The temperature compensation circuit 100 outputs a second compensation signal to the compensation node in the third temperature interval, and the second compensation signal is positively correlated with the temperature.

[0043] In some embodiments, the target temperature interval also includes a second temperature interval, and the second temperature interval is between the first temperature interval and the third temperature interval. The compensation signal output by the temperature compensation circuit 100 to the compensation node in the second temperature interval is independent of the temperature. For example, in the second temperature interval, the compensation signal output by the temperature compensation circuit 100 to the compensation node is zero, that is, in the second temperature interval, the temperature compensation circuit 100 does not output a compensation signal to the compensation node, and the voltage of the compensation node is the reference voltage Vref. In the first temperature interval, since the temperature compensation circuit 100 outputs a reverse compensation signal to the compensation node, the voltage of the compensation node is less than the reference voltage Vref; in the third temperature interval, since the temperature compensation circuit 100 outputs a forward compensation signal to the compensation node, the voltage of the compensation node is greater than the reference voltage Vref.

[0044] Exemplarily, 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.

[0045] 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, 10°C, and t2 can be 35°C, 40°C, and 50°C. It can be understood that the values ​​corresponding to t0, t1, t2, and t3 can also be set as needed.

[0046] In some embodiments, the compensation signal output by the temperature compensation circuit 100 to the compensation node may be a voltage signal, and the voltage signal may be converted into a compensation current Ic positively correlated therewith.

[0047] See also Figure 4 , in the first temperature interval, the corresponding temperature value is [t0, t1). At this time, the compensation signal output by the temperature compensation circuit 100 to the compensation node is negative and positively correlated with the temperature T. For example, in the first temperature interval, a reverse compensation signal can be obtained by extracting current from the compensation node. Since in the first temperature interval, the compensation signal output by the temperature compensation circuit 100 is negative, the corresponding compensation current Ic is also negative. Therefore, the higher the temperature value, the smaller the absolute value of the compensation current Ic, that is, the smaller the current value extracted from the compensation node.

[0048] In the second temperature interval, the corresponding temperature value is [t1, t2]. At this time, the compensation signal output by the temperature compensation circuit 100 to the compensation node is independent of the temperature. For example, in the second temperature interval, the temperature compensation circuit 100 does not output a compensation signal to the compensation node.

[0049] In the third temperature interval, the corresponding temperature value is (t2, t3]. At this time, the compensation signal output by the temperature compensation circuit 100 to the compensation node is positively correlated with the temperature T. For example, in the third temperature interval, the temperature compensation circuit 100 injects current into the compensation node, so that the voltage of the compensation node increases, and the corresponding compensation current Ic is positive, that is, the higher the temperature value, the greater the current injected by the temperature compensation circuit 100 to the compensation node, and the correspondingly higher the voltage of the compensation node and the greater the value of the compensation current Ic.

[0050] It should be noted that when the temperature compensation circuit does not output a compensation signal to the compensation node, the voltage of the compensation node is not zero, for example, it can be maintained as the reference voltage Vref, and the bias signal obtained based on the reference voltage Vref can remain unchanged. When working in the first temperature range, the temperature compensation circuit 100 extracts current from the compensation node, which can make the voltage of the compensation node decrease based on the reference voltage Vref, and the compensation current is a reverse current, thereby reducing the bias signal; when working in the second temperature range, the temperature compensation circuit 100 injects current into the compensation node, which can make the voltage of the compensation node increase based on the reference voltage Vref, and the compensation current is a forward current, thereby increasing the bias signal.

[0051] See also Figure 5 In some embodiments, the temperature compensation circuit 100 is used to provide a compensation signal to the bias circuit of the power amplifier, and the temperature compensation circuit 100 is provided with a compensation node (such as compensation node D) for connecting the 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, and an adjustment module 30 connecting the first temperature compensation module 10 and the second temperature compensation module 20, and the adjustment module 30 is connected to the power supply terminal V0 of the power amplifier.

[0052] The first temperature compensation module 10 is used to output a first compensation signal to the compensation node D in a first temperature range, and the first compensation signal is positively correlated with the temperature. The second temperature compensation module 20 is used to output a second compensation signal to the compensation node D in a third temperature range, and the second compensation signal is positively correlated with the temperature.

[0053] 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 the second temperature interval are independent of temperature, and the second temperature interval is between the first temperature interval and the third temperature interval. Optionally, the compensation signals output by the first temperature compensation module 10 and the second temperature compensation module 20 in the second temperature interval are zero.

[0054] like Figure 5 As shown, exemplarily, the first temperature compensation module 10 is further used to receive a first positive temperature coefficient current and a first zero temperature coefficient current, and 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 D within a first temperature interval. The second temperature compensation module 20 is further used to receive a second positive temperature coefficient current and a second zero temperature coefficient current, and the second positive temperature coefficient current and the second zero temperature coefficient current can enable the second temperature compensation module 20 to output a second compensation signal to the compensation node D within a third temperature interval.

[0055] Among them, the first positive temperature coefficient current is the current output by the first positive temperature coefficient power supply A1 connected to the first temperature compensation module 10, and the first positive temperature coefficient power supply A1 can be a positive temperature coefficient current source. The first zero temperature coefficient current is the current output by the first zero temperature coefficient power supply B1 connected to the first temperature compensation module 10, and the first zero temperature coefficient power supply B1 can 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.

[0056] The second positive temperature coefficient current is the current output by the second positive temperature coefficient power supply A2 connected to the second temperature compensation module 20, and the second positive temperature coefficient power supply A2 can be a positive temperature coefficient current source. The second zero temperature coefficient current is the current output by the second zero temperature coefficient power supply B2 connected to the second temperature compensation module 20, and the second zero temperature coefficient power supply B2 can 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.

[0057] like Figure 5 As 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 the first compensation signal to the compensation node D 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 the second compensation signal to the compensation node D after receiving the second positive temperature coefficient current and the second zero temperature coefficient current.

[0058] 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.

[0059] In the first temperature interval [t0, t1), the first temperature compensation module 10 outputs a first compensation signal to the compensation node D 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 D after receiving the second positive temperature coefficient current and the second zero temperature coefficient current.

[0060] In the second temperature interval [t1, t2], after receiving the first positive temperature coefficient current and the first zero temperature coefficient current, the first temperature compensation module 10 does not output a compensation signal to the compensation node D. Furthermore, after receiving the second positive temperature coefficient current and the second zero temperature coefficient current, the second temperature compensation module 20 does not output a compensation signal to the compensation node D.

[0061] In the third temperature interval (t2, t3], the second temperature compensation module 20 outputs a second compensation signal to the compensation node D 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 D after receiving the first positive temperature coefficient current and the first zero temperature coefficient current.

[0062] Optionally, 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 of the second temperature interval. When the second positive temperature coefficient current is equal to the second zero temperature coefficient current, the corresponding temperature value is the maximum temperature value of the second temperature interval.

[0063] 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 (that is, the minimum temperature value of the third temperature interval). In the above implementation, 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 100 to the target circuit can change with the change of temperature, so the electrical signal (e.g., the bias signal) output by the target circuit (e.g., the bias circuit) will change with the change of the compensation signal output by the temperature compensation circuit 100 to the compensation node D.

[0064] Therefore, in a scenario where the temperature compensation circuit 100 is applied to a power amplifier, after the bias circuit 200 is directly or indirectly connected to the compensation node D, a compensation signal that changes with temperature changes can be received through the compensation node D as a bias pre-signal (e.g., a bias source signal or a bias control signal), so that the bias circuit 200 can output a bias signal that changes with temperature to the power amplifier, that is, the bias signal output by the bias circuit 200 is adapted to the current temperature, thereby avoiding the situation where the performance of the power amplifier is deteriorated due to excessive temperature compensation.

[0065] It should be noted that when performing segmented temperature compensation on the power amplifier, since the gain of the power amplifier is higher and the output power is larger under low temperature conditions (such as the first temperature interval), and the gain of the power amplifier is also positively correlated with the power supply voltage, if the power supply voltage is too large under low temperature conditions, it is easy to cause the power amplifier to burn out. Therefore, the temperature compensation circuit 100 of the present application is provided with an adjustment module 30, and the adjustment module 30 is used to detect the power supply voltage of the power amplifier in the first temperature interval, and adjust the first slope between the first compensation signal and the temperature according to the power supply voltage, so that the first slope is positively correlated with the power supply voltage.

[0066] In the above embodiment, the power supply voltage of the power amplifier is detected within the first temperature range, and the first slope between the first compensation signal and the temperature is adjusted according to the power supply voltage, so that the first slope is positively correlated with the power supply voltage. Since the first compensation signal is negative within the first temperature range, it can be achieved that when the temperature is low and the power supply voltage increases, increasing the first slope can increase the current drawn from the compensation node, so that the bias current of the input power amplifier is reduced, thereby reducing the gain of the power amplifier, and further preventing the power amplifier from burning due to excessive power supply voltage in a low temperature environment, thereby improving the durability of the power amplifier.

[0067] See also Figure 5 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 inject a first positive temperature coefficient current into the compensation node D, and the first zero temperature compensation unit 102 is used to extract a first zero temperature coefficient current from the compensation node D; and in the first temperature interval, when the temperature is less than t1, the first positive temperature coefficient current is less than the first zero temperature coefficient current, and under the joint action of the first positive temperature compensation unit 101 and the first zero temperature compensation unit 102, the first temperature compensation module 10 also needs to extract a current (hereinafter referred to as "difference current") from the compensation node D that is the same as the difference between the first positive temperature coefficient current and the first zero temperature coefficient current, so that the first compensation signal output by the first temperature compensation module 10 to the compensation node is a reverse compensation signal, which plays a role in reducing the voltage of the compensation node D.

[0068] For example, if the voltage of the compensation node D is the reference voltage Vref without compensation, then after compensation in the first temperature range, the voltage of the compensation node D is Vref-ΔV, where -ΔV is the first compensation signal, and ΔV is positively correlated with the magnitude of the extracted differential current. Therefore, at a specific temperature point and a fixed reference voltage Vref, when the first slope between ΔV and temperature T is larger, ΔV is larger, and the voltage Vref-ΔV of the compensation node D is smaller.

[0069] 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 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 N1 and the fourth transistor N2 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.

[0070] Furthermore, 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 branch where the compensation node D is located. The first transistor P1 and the second transistor P2 can mirror the first positive temperature coefficient current output by the first positive temperature coefficient power supply A1, thereby injecting the first positive temperature coefficient current into the compensation node D, and the third transistor N1 and the fourth transistor N2 can mirror the first zero temperature coefficient current output by the first zero temperature coefficient power supply B1, thereby extracting the first zero temperature coefficient current from the compensation node D.

[0071] Optionally, the first transistor P1 and the second transistor P2 are first 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.

[0072] Further, in the first temperature interval, when the temperature is less than t1, the first positive temperature coefficient current is less than the first zero temperature coefficient current, 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 D through the third transistor N1. When the temperature is greater than or equal to t1, the first positive temperature coefficient current is greater than or equal to the first zero temperature coefficient current. According to Kirchhoff's current law, the difference current between the first positive temperature coefficient current and the first zero temperature coefficient current should flow from the common connection node of the third transistor N1 and the fourth transistor N2 to the compensation node D through the third transistor N1, but because the type of the third transistor N1 does not allow the current to pass in this direction, when the temperature is greater than or equal to t1, in the second temperature interval and the third temperature interval, the compensation signal output to the compensation node D is 0. That is, in the second temperature interval and the third temperature interval, no current is output to the compensation node D through the third transistor N1, and the third transistor N1 is equivalent to being in the off state.

[0073] like Figure 5 As 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 used to inject a second positive temperature coefficient current into the compensation node D, and the second zero temperature compensation unit 202 is used to extract a second zero temperature coefficient current from the compensation node D. In the third temperature range, when the temperature is greater than t2, the second positive temperature coefficient current is greater than the second zero temperature coefficient current. Under the joint action of the second positive temperature compensation unit 201 and the second zero temperature compensation unit 202, the second temperature compensation module 20 injects a current equal to the difference between the second positive temperature coefficient current and the second zero temperature coefficient current into the compensation node D, so that the second compensation signal output by the second temperature compensation module to the compensation node D is a positive compensation signal, which plays a role in increasing the voltage of the compensation node D.

[0074] For example, if the voltage of the compensation node D is the reference voltage Vref without compensation, then after compensation in the third temperature interval, the voltage of the compensation node D is Vref+ΔV, where ΔV is the second compensation signal and is positively correlated with the difference between the second positive temperature coefficient current and the second zero temperature coefficient current. Therefore, at a specific temperature point and a fixed reference voltage Vref, when the second slope is smaller, ΔV is smaller, and the voltage Vref+ΔV of the compensation node D is smaller.

[0075] Exemplarily, 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.

[0076] Furthermore, 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, the second end of the fifth transistor P3 is connected to the second end of the seventh transistor N3 and the first end of the eighth transistor N4, the second end of the eighth transistor N4 is grounded, and the second end of the sixth transistor P4 is connected to the branch where the compensation node D is located. Among them, the fifth transistor P3 and the sixth transistor P4 can mirror the second positive temperature coefficient current output by the second positive temperature coefficient power supply A2, thereby injecting the second positive temperature coefficient current into the compensation node D, and the seventh transistor N3 and the eighth transistor N4 can mirror the second zero temperature coefficient current output by the second zero temperature coefficient power supply B2, thereby extracting the first zero temperature coefficient current from the compensation node D.

[0077] Optionally, the fifth transistor P3 and the sixth transistor P4 are third type transistors, and the seventh transistor N3 and the eighth transistor N4 are fourth type transistors different from the third type transistors. For example, the third type transistor is a PMOS transistor, and the fourth type transistor is an NMOS transistor.

[0078] Further, when the temperature is greater than t2 in the third temperature interval, 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 D through the sixth transistor P4. When the temperature is less than or equal to t2, the second positive temperature coefficient current is less than or equal to the second zero temperature coefficient current. According to Kirchhoff's current law, the difference current between the second positive temperature coefficient current and the second zero temperature coefficient current should flow from the compensation node D through the sixth transistor P4 to the common connection node of the fifth transistor P3 and the sixth transistor P4, but because the type of the sixth transistor P4 does not allow the current to pass in this direction, therefore, when the temperature is less than or equal to t2, in the first temperature interval and the second temperature zone, the compensation signal output by the second temperature compensation module 20 to the compensation node D is 0. That is, in the first temperature interval and the second temperature zone, no current is output to the compensation node D through the sixth transistor P4, which is equivalent to the sixth transistor P4 being in the off state.

[0079] In some embodiments, the difference current between the first zero temperature coefficient current and the first positive temperature coefficient current is negatively correlated with the first compensation signal; the difference current between the second positive temperature coefficient current and the second zero temperature coefficient current is positively correlated with the second compensation signal.

[0080] like Figure 5 As shown, as an embodiment, the first compensation signal and the second compensation signal can be voltage signals, and the difference current between the first zero temperature coefficient current and the first positive temperature coefficient current can be converted into the first compensation signal through the resistor R, and the difference current between the second positive temperature coefficient current and the second zero temperature coefficient current can be converted into the second compensation signal. Optionally, the above-mentioned resistor R can be an adjustable resistor or a fixed resistor. When the above-mentioned resistor R is an adjustable resistor, the first slope can be adjusted by adjusting the resistance value of the resistor. When the above-mentioned resistor R is a fixed resistor, the first slope can be adjusted by adjusting the multiple of the difference current.

[0081] Exemplarily, the first positive temperature coefficient current can be expressed as I 1 , the first zero temperature coefficient current can be expressed as I 2 , the first compensation signal can be expressed as -I×R, where I=|I 2 -I 1|, that is, I is the difference current between the first zero temperature coefficient current and the first positive temperature coefficient current, and R is the resistance of the adjustable resistor. If the reference voltage of the compensation node is Vref when the temperature compensation is 0, then in the first temperature range, after applying the first compensation signal, the voltage of the compensation node is Vout = Vref-I × R. It can be understood that since the first positive temperature compensation unit 101 is used to inject the first positive temperature coefficient current I into the compensation node D 1 The first zero temperature compensation unit 102 is used to extract a first zero temperature coefficient current I from the compensation node D. 2 , when the first positive temperature coefficient current I 1 Less than the first zero temperature coefficient current I 2 When the current drawn from the compensation node D is greater than the current injected into the compensation node D, the sign of the first compensation signal is negative, which is consistent with the first zero temperature coefficient current I 2 With the first positive temperature coefficient current I 1 The difference between the current I and I is negatively correlated. 1 For positive temperature coefficient current, I 2 It is a zero temperature coefficient current, so the difference current I between the two is also a positive temperature coefficient current. The voltage Vout of the compensation node obtained according to the difference current I is a positive temperature coefficient voltage. According to Vout=Vref-I×R, it can be known that in the first temperature range, the first slope between the voltage Vout of the compensation node and the temperature T is negatively correlated with the resistance value of the resistor R. Therefore, the first slope can be adjusted by adjusting the resistance value of the resistor R.

[0082] Exemplarily, the second positive temperature coefficient current can be expressed as I 3 , the second zero temperature coefficient current can be expressed as I 4 , the second compensation signal can be expressed as I×R, where the difference current I=|I 3 -I 4 |, that is, I is the difference current between the second zero temperature coefficient current and the second positive temperature coefficient current, and R is the resistance of the adjustable resistor. If the reference voltage of the compensation node D is Vref when the temperature compensation is 0, then in the third temperature range, after applying the second compensation signal, the voltage of the compensation node D is Vout=Vref+I×R. It can be understood that since the second positive temperature compensation unit 201 is used to inject the second positive temperature coefficient current I into the compensation node D 3 The second zero temperature compensation unit is used to extract a second zero temperature coefficient current I from the compensation node D. 4 , when the second positive temperature coefficient current I 3 Greater than the second zero temperature coefficient current I 4 When the current injected from the compensation node D is greater than the current drawn, the second zero temperature coefficient current I 3 The second positive temperature coefficient current I4 The difference current I between them is positively correlated with the second compensation signal.

[0083] See also Figure 6 In some embodiments, the temperature compensation circuit 100 further includes a voltage-current conversion module 40, which is connected between the compensation node D and the bias circuit 200. The voltage-current conversion module 40 is used to convert the compensation signal output by the compensation node D into a compensation current, and input the compensation current into the bias circuit 200; the first compensation signal is positively correlated with the bias signal output by the bias circuit 200; and the second compensation signal is positively correlated with the bias signal output by the bias circuit 200.

[0084] For example, Figure 6 As shown, the voltage-current conversion module 40 may include an operational amplifier T3 and a second resistor R2, the inverting input terminal of the operational amplifier T3 is used to receive the voltage signal (Vref±I×R) output by the compensation node D, the output terminal of the operational amplifier T3 is connected to the bias circuit 200, the first end of the second resistor R2 is connected to the output terminal of the operational amplifier T3, the second end of the second resistor R2 is grounded, and the non-inverting input terminal of the operational amplifier T3 is connected to the first end of the second resistor R2.

[0085] Exemplarily, when the voltage-current conversion module 40 converts the voltage signal output from the compensation node D into a compensation current, the compensation current can be calculated by the following calculation formula: Iref = Vout / R2 = (Vref±I×R) / R2 = Vref / R2±I×R / R2, wherein Vout is the voltage signal of the compensation node D, which is the superposition of the reference voltage Vref and the temperature compensation signal ±I×R; Iref is the total current output by the voltage-current conversion module 4, including the reference current part Vref / R2 and the compensation current part ±I×R / R2, wherein the reference current part is obtained by conversion based on the reference voltage Vref, and the compensation current part is obtained by conversion based on the compensation signal ±I×R provided for the compensation node and the resistor R2. Exemplarily, when the adjustable resistor R has the same resistance as the second resistor R2, the magnitude of the compensation current is the same as the magnitude of the aforementioned difference current I.

[0086] It should be noted that, since the current Iref is used to input the bias circuit 200 to adjust the bias signal (e.g., bias current) of the bias circuit 200, the higher the voltage of the compensation node D, the larger the bias signal output by the bias circuit 200, and the lower the voltage of the compensation node D, the smaller the bias signal output by the bias circuit 200.

[0087] In the embodiment of the present application, for the formula Iref=(Vref±I×R) / R2, since the reference voltage Vref and the second resistor R2 are both fixed values, the slope between the current Iref and the temperature is related to the difference current I and the adjustable resistor R, so the slope between the current Iref and the temperature can be adjusted by adjusting the difference current I or the adjustable resistor R. The difference current I or the adjustable resistor R can be adjusted according to the power supply voltage Vcc.

[0088] In some embodiments, within the first temperature range, when the first zero temperature coefficient current is greater than the first positive temperature coefficient current, the difference current between the first zero temperature coefficient current and the first positive temperature coefficient current is configured to be positively correlated with the supply voltage.

[0089] Exemplarily, in the first temperature interval [t0, t1), the first zero temperature coefficient current I 2 Greater than the first positive temperature coefficient current I 1 When the first zero temperature coefficient current I 2 With the first positive temperature coefficient current I 1 The difference between the current I=|I 2 -I 1 | is configured to be positively correlated with the power supply voltage Vcc. It should be noted that according to the formula Iref=Vout / R2=(Vref-|I 2 -I 1 |×R) / R2, it can be seen that when the supply voltage Vcc increases, by configuring the difference current I=|I 2 -I 1 | increases, and the first slope between the current Iref and the temperature also increases. Increasing the current drawn from the compensation node D can reduce the bias signal of the bias circuit 200, thereby reducing the gain of the power amplifier, thereby preventing the power amplifier from burning due to excessive power supply voltage Vcc in a low temperature environment, and improving the durability of the power amplifier.

[0090] In some embodiments, the adjustment module 30 is further used to detect the power supply voltage of the power amplifier within the third temperature range, and adjust the second slope between the second compensation signal and the temperature according to the power supply voltage, so that the second slope is negatively correlated with the power supply voltage. Accordingly, within the third temperature range, when the second zero temperature coefficient current is less than the second positive temperature coefficient current, the difference current between the second zero temperature coefficient current and the second positive temperature coefficient current is configured to be negatively correlated with the power supply voltage.

[0091] Exemplarily, in the third temperature interval (t2, t3], the second zero temperature coefficient current I 4 Less than the second positive temperature coefficient current I 3 When the second positive temperature coefficient current I 3With the second zero temperature coefficient current I 4 The difference between the current I=|I 3 -I 4 | is configured to be negatively correlated with the supply voltage Vcc. It should be noted that according to the formula Iref=Vout / R2=(Vref+|I 3 -I 4 |×R) / R2, it can be seen that when the supply voltage Vcc increases, by configuring the difference current I=|I 3 -I 4 |decreases, and the second slope between the current Iref and the temperature also decreases, which is equivalent to reducing the current injected into the compensation node D at a specific temperature, thereby reducing the bias signal of the bias circuit 200, thereby reducing the gain of the power amplifier, and further preventing the power amplifier from being burned due to an excessively large power supply voltage Vcc, thereby improving the durability of the power amplifier.

[0092] See also Figure 7 In some embodiments, the first temperature compensation module 10 includes a first zero temperature compensation unit 301 and a first negative temperature compensation unit 302 connected to the first zero temperature compensation unit 301, the first zero temperature compensation unit 301 is used to inject a first zero temperature coefficient current into the compensation node D, and the first negative temperature compensation unit 302 is used to extract a first negative temperature coefficient current from the compensation node D; and in the first temperature range, when the first negative temperature coefficient current is greater than the first zero temperature coefficient current, the first temperature compensation module 10 outputs a first compensation signal to the compensation node D.

[0093] like Figure 7 As shown, in some embodiments, the second temperature compensation module 20 includes a second zero temperature compensation unit 401 and a second negative temperature compensation unit 402 connected to the second zero temperature compensation unit 401, the second zero temperature compensation unit 401 is used to inject a second zero temperature coefficient current into the compensation node D, and the second negative temperature compensation unit 402 is used to extract a second negative temperature coefficient current from the compensation node D; and in the second temperature range, when the second zero temperature coefficient current is greater than the second negative temperature coefficient current, the second temperature compensation module 20 outputs a second compensation signal to the compensation node D.

[0094] In some embodiments, the first compensation signal and the second compensation signal may be voltage signals, and the difference current between the first zero temperature coefficient current and the first negative temperature coefficient current may be converted into the first compensation signal through the resistor R, and the difference current between the second negative temperature coefficient current and the second zero temperature coefficient current may be converted into the second compensation signal. Optionally, the resistor R may be an adjustable resistor or a fixed resistor. When the resistor R is an adjustable resistor, the first slope may be adjusted by adjusting the resistance value of the resistor. When the resistor R is a fixed resistor, the first slope may be adjusted by adjusting the multiple of the difference current.

[0095] Exemplarily, in this embodiment, the first negative temperature coefficient current can be expressed as I 6 , the first zero temperature coefficient current can be expressed as I 5 , the first compensation signal can be expressed as -I×R, where I=|I 6 -I 5 | is a negative temperature coefficient current. If the reference voltage of the compensation node is Vref when the temperature compensation is 0, then in the first temperature range, after applying the first compensation signal, the voltage of the compensation node is Vout = Vref-I × R = Vref-|I 6 -I 5 |×R, if the voltage Vout of the compensation node is converted into the current Iref based on the resistor R2, then Iref=(Vref-I×R) / R2=Vref / R2-|I 6 -I 5 |×R / R2, it can be seen that in the first temperature range, Iref is a negative temperature coefficient current and is negatively correlated with I and R.

[0096] As an implementation mode, the first slope is adjusted by adjusting the resistance value of resistor R. Specifically, in the first temperature range [t0, t1), when the first negative temperature coefficient current is greater than the first zero temperature coefficient current, the resistance value of resistor R can be adjusted according to the power supply voltage Vcc, so that the resistance value of resistor R is positively correlated with the power supply voltage Vcc. Therefore, at the same temperature, the higher the power supply voltage Vcc, the smaller the current Iref, thereby preventing the power amplifier from burning due to excessive power supply voltage in a low temperature environment.

[0097] As another embodiment, the first slope is adjusted by adjusting the difference current I. Specifically, within the first temperature range, when the first negative temperature coefficient current is greater than the first zero temperature coefficient current, the difference current between the first negative temperature coefficient current and the first zero temperature coefficient current is configured to be positively correlated with the supply voltage.

[0098] For example, in the first temperature interval [t0, t1), the first negative temperature coefficient current I 6 Greater than the first zero temperature coefficient current I5 When the first negative temperature coefficient current I 6 With the first zero temperature coefficient current I 5 The difference between the current I=|I 6 -I 5 |Configured to be positively correlated with the supply voltage Vcc.

[0099] It should be noted that since I is a current with a temperature coefficient, according to the formula Iref = Vout / R2 = (Vref-|I 6 -I 5 |×R) / R2, it can be seen that when the supply voltage Vcc increases, by configuring the difference current I=|I 6 -I 5 | increases, that is, increases the coefficient between the difference current I and the temperature. At this time, the first slope between the current Iref and the temperature also increases, which is equivalent to increasing the current drawn from the compensation node D at a specific temperature, which can reduce the bias signal of the bias circuit 200, thereby reducing the gain of the power amplifier, and further preventing the power amplifier from burning due to excessive power supply voltage Vcc in a low temperature environment, thereby improving the durability of the power amplifier.

[0100] Optionally, as an implementation, the first slope may be adjusted by mirroring the difference current I in proportion.

[0101] Exemplarily, in this embodiment, the second negative temperature coefficient current can be expressed as I 8 , the second zero temperature coefficient current can be expressed as I 7 , the second compensation signal can be expressed as I×R, where I=|I 7 -I 8 | is a negative temperature coefficient current. If the reference voltage of the compensation node is Vref when the temperature compensation is 0, then in the third temperature range, after applying the second compensation signal, the voltage of the compensation node is Vout = Vref + I × R = Vref + |I 7 -I 8 |×R, if the voltage Vout of the compensation node is converted into the current Iref based on the resistor R2, then Iref=(Vref-I×R) / R2=Vref / R2+|I 7 -I 8 |×R / R2, it can be seen that Iref is a negative temperature coefficient current and is positively correlated with I and R.

[0102] As an implementation method, when the second slope needs to be adjusted, the first slope can be adjusted by adjusting the resistance value of the resistor R. Specifically, in the third temperature interval (t2, t3], the second zero temperature coefficient current I 7 Greater than the second negative temperature coefficient current I 8When the power supply voltage Vcc is set, the resistance value of the resistor R can be adjusted according to the power supply voltage Vcc, so that the resistance value of the resistor R is negatively correlated with the power supply voltage Vcc. Therefore, at the same temperature, the higher the power supply voltage Vcc, the smaller the current Iref, thereby preventing the power amplifier from being burned due to excessive power supply voltage.

[0103] As another embodiment, when the second slope needs to be adjusted, the second slope can be adjusted by adjusting the difference current I. Specifically, in the third temperature range, when the second zero temperature coefficient current is greater than the second negative temperature coefficient current, the difference current between the second zero temperature coefficient current and the second negative temperature coefficient current is configured to be negatively correlated with the supply voltage.

[0104] For example, in the third temperature interval (t2, t3], the second zero temperature coefficient current I 7 Greater than the second negative temperature coefficient current I 8 When the second zero temperature coefficient current I 7 With the second negative temperature coefficient current I 8 The difference between the current I=|I 7 -I 8 |Configured to be negatively correlated with the supply voltage Vcc.

[0105] It should be noted that according to the formula Iref=Vout / R2=(Vref+|I 7 -I 8 |×R) / R2, it can be seen that when the supply voltage Vcc increases, by configuring the difference current I=|I 7 -I 8 | is reduced, that is, the coefficient between the difference current I and the temperature is reduced. At this time, the first slope between the current Iref and the temperature is also reduced, which is equivalent to reducing the current injected into the compensation node D at a specific temperature. The bias signal of the bias circuit 200 can be reduced, thereby reducing the gain of the power amplifier, thereby preventing the power amplifier from being burned due to an excessively large power supply voltage Vcc, and improving the durability of the power amplifier.

[0106] In the embodiment of the present application, when it is necessary to adjust the first slope between the first compensation signal and the temperature according to the change of the power supply voltage, it can be further determined in which voltage range the power supply voltage is to determine the voltage range corresponding to the power supply voltage.

[0107] In some embodiments, the adjustment module is further configured to compare the supply voltage with at least one third threshold voltage to determine a voltage interval corresponding to the supply voltage, and adjust the first slope to a slope corresponding to the voltage interval.

[0108] Exemplarily, at least one third threshold voltage Vth3 can be set, for example, the third threshold voltage Vth3 can be 4V, 4.3V, 4.6V, etc. The supply voltage can be compared with at least one third threshold voltage Vth3 by a comparator. When the supply voltage Vcc is less than 4V, the voltage interval corresponding to the supply voltage Vcc can be determined to be (-∞, 4V); when the supply voltage Vcc is greater than or equal to 4V and less than 4.3V, the voltage interval corresponding to the supply voltage Vcc can be determined to be [4V, 4.3V); when the supply voltage Vcc is greater than or equal to 4.3V and less than 4.6V, the voltage interval corresponding to the supply voltage Vcc can be determined to be [4.3V, 4.6V); when the supply voltage Vcc is greater than or equal to 4.6V, the voltage interval corresponding to the supply voltage Vcc can be determined to be [4.6V, +∞).

[0109] Exemplarily, different voltage intervals may be preconfigured to correspond to different slopes. For a first slope, the greater the voltage value in the voltage interval, the greater the first slope. For a second slope, the greater the voltage value in the voltage interval, the smaller the second slope. Furthermore, the slope corresponding to each voltage interval may be adjusted independently, regardless of the slopes corresponding to other voltage intervals.

[0110] In the above embodiment, by determining the voltage interval corresponding to the supply voltage and adjusting the first slope to the slope corresponding to the voltage interval, it is possible to more accurately adjust the first slope between the first compensation signal and the temperature.

[0111] In some embodiments, the adjustment module is further used to detect the power supply voltage of the power amplifier within a third temperature range, and adjust the second slope between the second compensation signal and the temperature according to the power supply voltage, so that the second slope is negatively correlated with the power supply voltage.

[0112] Accordingly, when adjusting the second slope between the second compensation signal and the temperature according to the supply voltage, the supply voltage can be compared with at least one fourth threshold voltage to determine the voltage interval corresponding to the supply voltage, and the second slope can be adjusted to a slope corresponding to the voltage interval. The specific process of comparing the supply voltage with the at least one fourth threshold voltage is similar to the specific process of comparing the supply voltage with the at least one third threshold voltage, and will not be described in detail herein.

[0113] In the above embodiment, by detecting the power supply voltage of the power amplifier within the second temperature range and adjusting the second slope between the second compensation signal and the temperature according to the power supply voltage, and the power supply voltage is negatively correlated with the second slope, it can be achieved that when the power supply voltage increases, the bias current of the input power amplifier is reduced by reducing the second slope, thereby reducing the gain of the power amplifier, thereby preventing the power amplifier from burning out due to excessive power supply voltage, and improving the durability of the power amplifier.

[0114] See also Figure 8 The regulating module 30 may include a voltage acquisition unit 31 , a voltage comparison unit 32 , a control unit 33 and a regulating unit 34 .

[0115] The voltage acquisition unit 31 is used to acquire the power supply voltage Vcc of the power amplifier and input the power supply voltage Vcc into the voltage comparison unit 32. Exemplarily, the voltage acquisition unit 31 may include a voltage detection circuit. The circuit structure of the voltage detection circuit can be found in the relevant technology and will not be described here.

[0116] The voltage comparison unit 32 is used for comparing the supply voltage Vcc with at least one third threshold voltage Vth3 and outputting a comparison result to the control unit 33 , where the comparison result is used for indicating a voltage interval corresponding to the supply voltage Vcc.

[0117] The control unit 33 is connected to the voltage comparison unit 32 and the adjustment unit 34, and is used to control the adjustment unit 34 to adjust the first slope to a slope corresponding to the voltage interval according to the comparison result output by the voltage comparison unit 32. The control unit may include one or more logic gate circuits.

[0118] Taking the adjustment of the first slope as an example, in an embodiment of the present application, it can be first determined whether it is necessary to adjust the first slope between the first compensation signal and the temperature according to the change of the power supply voltage. When it is necessary to adjust the first slope between the first compensation signal and the temperature according to the change of the power supply voltage, it can be further determined in which voltage range the power supply voltage is in order to determine the voltage range corresponding to the power supply voltage, and then the first slope is adjusted to the slope corresponding to the voltage range, so as to achieve more accurate adjustment of the first slope between the first compensation signal and the temperature. Exemplarily, within the first temperature range, the first slope is positively correlated with the power supply voltage. For example, the larger the power supply voltage, the larger the first slope; the smaller the power supply voltage, the smaller the first slope.

[0119] See also Fig. 9 In some embodiments, the voltage comparison unit 32 includes at least one first comparator, the first input terminal of each first comparator is used to receive the power supply voltage Vcc, the second input terminal of each first comparator is used to receive the corresponding third threshold voltage, wherein different first comparators correspond to different third threshold voltages, and the output terminal of the first comparator is connected to the control unit 33.

[0120] Exemplarily, the first input terminal of the first comparator may be a non-inverting input terminal, and the second input terminal of the first comparator may be an inverting input terminal. Different first comparators may correspond to different third threshold voltages. Fig. 9As shown, the third threshold voltage corresponding to comparator A is 4V, the third threshold voltage corresponding to comparator B is 4.3V, and the third threshold voltage corresponding to comparator C is 4.6V.

[0121] Exemplarily, when the value output by comparator A is 1 and the value output by comparator B is 0, it indicates that the voltage interval corresponding to the power supply voltage Vcc is [4V, 4.3V). When the value output by comparator A is 1, the value output by comparator B is 1, and the value output by comparator C is 0, it indicates that the voltage interval corresponding to the power supply voltage Vcc is [4.3V, 4.6V).

[0122] In the above embodiment, by setting at least one first comparator in the voltage comparison unit 32, different first comparators correspond to different third threshold voltages, so that at least one first comparator can be used to determine the voltage interval corresponding to the power supply voltage Vcc.

[0123] In some embodiments, in the first temperature range, the compensation signal outputted by the first temperature compensation module to the compensation node is positively correlated with the resistance of the adjustment unit. In the third temperature range, the compensation signal outputted by the second temperature compensation module to the compensation node is negatively correlated with the resistance of the adjustment unit.

[0124] It should be noted that in the embodiment of the present application, the compensation signal of the compensation node D can be adjusted by adjusting the resistance of the adjustment unit 34, thereby adjusting the first slope, or adjusting the first slope and the second slope.

[0125] See also Fig.10 In some embodiments, the adjusting unit 34 includes an adjustable resistor R, one end of the adjustable resistor R is used to receive a preset reference voltage Vref, and the other end is connected to the compensation node D. The resistance of the adjustable resistor R is related to the first slope, and the adjusting unit 34 is used to adjust the resistance of the adjustable resistor R according to the power supply voltage Vcc to adjust the first slope.

[0126] For example, since I is a current with a temperature coefficient, combined with Figure 6 and Fig.10 According to the formula Iref=(Vref±I×R) / R2, by adjusting the resistance value of the adjustable resistor R, the coefficient between Iref and temperature can be changed, thereby adjusting the first slope.

[0127] In some embodiments, the control unit 33 is used to: within the first temperature range, control the resistance of the adjustable resistor R to be positively correlated with the supply voltage Vcc.

[0128] Exemplarily, in the first temperature interval [t0, -t1), the resistance value of the adjustable resistor R can be configured to be positively correlated with the power supply voltage Vcc. It can be understood that according to the formula Iref = Vout / R2 = (Vref-I×R) / R2, when the power supply voltage Vcc increases, the adjustable resistor R is configured to increase, and the first slope between the current Iref and the temperature also increases. Increasing the current drawn from the compensation node D can reduce the bias signal of the bias circuit, thereby reducing the gain of the power amplifier, and thus preventing the power amplifier from burning due to excessive power supply voltage in a low temperature environment.

[0129] In some embodiments, when the adjustment module is also used to adjust the second slope between the second compensation signal and the temperature according to the power supply voltage within the third temperature range, so that the second slope is negatively correlated with the power supply voltage, correspondingly, the control unit 33 is also used to: within the third temperature range, control the resistance value of the adjustable resistor R to be negatively correlated with the power supply voltage Vcc.

[0130] Exemplarily, in the third temperature interval (t2, t3], the resistance of the adjustable resistor R can be configured to be negatively correlated with the power supply voltage Vcc. According to the formula Iref=Vout / R2=(Vref+I×R) / R2, when the power supply voltage Vcc increases, the adjustable resistor R is configured to decrease. At this time, the second slope between the current Iref and the temperature also decreases, and the current injected into the compensation node is reduced. The bias signal of the bias circuit can be reduced, thereby reducing the gain of the power amplifier, thereby preventing the power amplifier from burning out due to excessive power supply voltage, thereby improving the durability of the power amplifier.

[0131] See also Fig.11 In some embodiments, the adjustment unit 34 includes one or more parallel resistor branches; at least one of the resistor branches includes a first switch and a third resistor connected in series; the control unit 33 is used to control the first switch to be turned on or off according to the comparison result output by the voltage comparison unit 32 within the first temperature range, so that the resistance value of the adjustment unit 34 is positively correlated with the power supply voltage Vcc. The first switch may include switches K11, ..., and switches K1n, and the third resistor may include resistors R31, ..., and resistors R3n, where n is the number of the resistor branches.

[0132] Exemplarily, the first switch K1 may include but is not limited to a triode, a metal-oxide-semiconductor field-effect transistor (MOS), an insulated gate bipolar transistor (IGBT), a relay, an optical coupler, and the like.

[0133] There are multiple first switches, and the control unit 33 adjusts the resistance of the adjustment unit 34 by adjusting the number of first switches that are turned on. For example, when the supply voltage increases, the number of resistors connected to the circuit can be reduced by reducing the number of first switches that are turned on, thereby increasing the resistance of the entire adjustment unit 34.

[0134] See also Fig.12 In some other embodiments, the adjustment unit 34 includes a plurality of resistor units connected in series, wherein at least one resistor unit includes a first switch and a second resistor connected in parallel. The first switch may include switches K11, ..., and switches K1n, and the third resistor may include resistors R31, ..., and resistors R3n, where n is the number of resistor units. The control unit 33 is used to control the first switch to be turned on or off in the first temperature range according to the comparison result output by the voltage comparison unit 32, so that the resistance value of the adjustment unit 34 is positively correlated with the power supply voltage Vcc.

[0135] For example, when the power supply voltage Vcc increases, the number of first switches turned on can be reduced, the number of resistors connected to the circuit can be increased, and the resistance of the entire adjustment unit 34 can be increased. When the power supply voltage decreases, the number of first switches turned on can be increased, the number of resistors connected to the circuit can be reduced, and the resistance of the entire adjustment unit 34 can be reduced.

[0136] See also Fig.13 In some embodiments, the temperature compensation circuit 100 may further include a detection module 50, which is used to enable the adjustment module 30 when the detection voltage positively correlated with the operating temperature of the power amplifier is less than a preset first threshold voltage. Alternatively, the detection module 50 is used to enable the adjustment module 30 when the detection voltage negatively correlated with the operating temperature of the power amplifier is greater than a second threshold voltage.

[0137] The temperature value corresponding to the first threshold voltage is within the second temperature interval, the temperature value corresponding to the second threshold voltage is within the second temperature interval, and the second temperature interval is between the first temperature interval and the third temperature interval. The temperature value corresponding to the first threshold voltage is the operating temperature corresponding to when the detection voltage positively correlated with the operating temperature of the power amplifier is equal to the first threshold voltage, and the temperature value corresponding to the second threshold voltage is the operating temperature corresponding to when the detection voltage negatively correlated with the operating temperature of the power amplifier is equal to the second threshold voltage.

[0138] As an implementation mode, the temperature value corresponding to the first threshold voltage or the temperature value corresponding to the second threshold voltage is greater than the minimum value of the second temperature interval and less than the maximum value of the second temperature interval, that is, the temperature value corresponding to the first threshold voltage or the temperature value corresponding to the second threshold voltage does not include the two threshold values ​​of the second temperature interval. In this way, when the adjustment module needs to adjust the first slope according to the power supply voltage in the first temperature interval, even if there is an error in the detection voltage positively correlated with the operating temperature of the power amplifier or the detection voltage negatively correlated with the operating temperature of the power amplifier, it can be ensured that when the operating temperature is the maximum value of the first temperature interval, the adjustment module 30 can be enabled without being affected by the error of the detection voltage. Similarly, when the adjustment module also needs to adjust the second slope according to the power supply voltage in the third temperature interval, even if there is an error in the detection voltage positively correlated with the operating temperature of the power amplifier or the detection voltage negatively correlated with the operating temperature of the power amplifier, it can be ensured that when the operating temperature is the maximum and minimum values ​​of the third temperature interval, the adjustment module 30 can be enabled without being affected by the error of the detection voltage.

[0139] Optionally, the temperature value corresponding to the first threshold voltage or the temperature value corresponding to the second threshold voltage may be within the interval [t1+1 / 3(t2-t1), t1+2 / 3(t2-t1)]. Exemplarily, the temperature value corresponding to the first threshold voltage may be the middle value of the second temperature interval.

[0140] In the embodiment of the present application, a temperature detection circuit can be used to detect a detection voltage related to the operating temperature of the power amplifier. It should be noted that the temperature detection circuit can receive a current with a temperature coefficient and generate a detection voltage positively or negatively correlated with the operating temperature of the power amplifier based on the current with the temperature coefficient.

[0141] In some embodiments, the temperature detection circuit may include a detection resistor R T1 , the detection resistor R T1 The first end is used to receive a current I having a temperature coefficient T , the detection resistor R T1 The second end of the detection resistor is grounded; wherein the first end of the detection resistor is the output end of the temperature detection circuit. In this example, the current I T Flowing through the detection resistor R T1 , the detection resistor R T1 The voltage drop V across the two ends of T =I T *R T1 , due to the detection resistor R T1 The second end of the sense resistor R T1 The detection voltage output from the first end is the detection resistor R T1 The voltage drop across the two ends is V TOptionally, the current I T It can have a positive temperature coefficient or a negative temperature coefficient. T When the current I T With a negative temperature coefficient, the generated sense voltage is inversely related to the operating temperature of the power amplifier.

[0142] In other embodiments, the temperature detection circuit can detect the operating temperature of the power amplifier through a voltage-dividing resistor string, or detect the operating temperature of the power amplifier through at least one temperature-sensitive element. Among them, the temperature-sensitive element can be an element with positive temperature characteristics, or an element with negative temperature characteristics (for example, a diode or a transistor). When the temperature detection element has a positive temperature characteristic, the detection voltage output by the temperature detection circuit has a positive temperature coefficient; when the temperature detection element has a negative temperature characteristic, the detection voltage output by the temperature detection circuit has a negative temperature coefficient. It should be noted that the specific process of using a voltage-dividing resistor string or at least one temperature-sensitive element to detect the operating temperature of the power amplifier can be referred to the relevant technology, which will not be repeated here.

[0143] like Fig.13 As shown, in some embodiments, the detection module 50 includes a second comparator T2, and the first input terminal of the second comparator T2 is used to receive the detection voltage V T The second input terminal of the second comparator T2 is used to receive the first threshold voltage Vth1 or the second threshold voltage Vth2. The output terminal of the second comparator T2 is connected to the adjustment module 30. The adjustment module 30 is used to output the result of the second comparator T2 as the detection voltage V T is less than the first threshold voltage Vth1 or the detection voltage V T When the voltage Vth is greater than the second threshold voltage Vth2, the power supply voltage Vcc of the power amplifier is detected, and the first slope is adjusted according to the power supply voltage Vcc.

[0144] Exemplarily, the regulating module 30 detects the voltage V T When the voltage Vcc is less than the first threshold voltage Vth1, the first slope is adjusted according to the power supply voltage Vcc. For example, in the first temperature range, the power supply voltage is positively correlated with the first slope. When the power supply voltage increases, the first slope is adjusted to increase.

[0145] In the above embodiment, since the temperature value corresponding to the first threshold voltage is one of the values ​​in the second temperature range, and the detection voltage is positively correlated with the operating temperature of the power amplifier, by adjusting the first slope according to the power supply voltage when the detection voltage is less than the first threshold voltage or greater than the second threshold voltage, it is possible to increase the first slope when the temperature is low so that the bias current of the input power amplifier is reduced, thereby reducing the gain of the power amplifier, and further preventing the power amplifier from burning due to excessive power supply voltage in a low temperature environment, thereby improving the durability of the power amplifier.

[0146] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A temperature compensation circuit, characterized in that: Used to provide a compensation signal to a bias circuit of a power amplifier, the temperature compensation circuit comprising at least one first temperature compensation module, at least one second temperature compensation module and an adjustment module connected to the first temperature compensation module and the second temperature compensation module, the adjustment module being connected to a power supply terminal of the power amplifier; 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 is positively correlated 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, the second compensation signal is positively correlated with the temperature, and the minimum value of the third temperature range is greater than the maximum value of the first temperature range; The regulating module is used to detect the supply voltage of the power amplifier within the first temperature range, and to adjust a first slope between the first compensation signal and temperature according to the supply voltage, and the supply voltage is positively correlated with the first slope.

2. The temperature compensation circuit according to claim 1, characterized in that: The regulating module is further configured to compare the supply voltage with at least one third threshold voltage to determine a voltage interval corresponding to the supply voltage, and to regulate the first slope to a slope corresponding to the voltage interval.

3. The temperature compensation circuit according to claim 2, characterized in that: The regulation module includes a voltage acquisition unit and a voltage comparison unit. 、 Control unit and regulating unit; Wherein, the voltage acquisition unit is used to acquire the power supply voltage of the power amplifier and input the power supply voltage into the voltage comparison unit; The voltage comparison unit is used to compare the supply voltage with at least one third threshold voltage and output a comparison result to the control unit, wherein the comparison result is used to indicate a voltage interval corresponding to the supply voltage; The control unit is connected to the voltage comparison unit and the adjustment unit, and is used to control the adjustment unit to adjust the first slope to a slope corresponding to the voltage interval according to a comparison result output by the voltage comparison unit.

4. The temperature compensation circuit according to claim 3, characterized in that: The voltage comparison unit includes at least one first comparator, the first input end of each first comparator is used to receive the supply voltage, the second input end of each first comparator is used to receive the corresponding third threshold voltage, wherein different first comparators correspond to different third threshold voltages, and the output end of the first comparator is connected to the control unit.

5. The temperature compensation circuit according to claim 3, characterized in that: In the first temperature range, the compensation signal outputted by the first temperature compensation module to the compensation node is positively correlated with the resistance value of the adjustment unit.

6. The temperature compensation circuit according to claim 3, characterized in that: The adjusting unit comprises an adjustable resistor, one end of the adjustable resistor is used to receive a preset reference voltage, and the other end is connected to the compensation node; The resistance value of the adjustable resistor is related to the first slope, and the adjusting unit is used to adjust the resistance value of the adjustable resistor according to the supply voltage to adjust the first slope.

7. The temperature compensation circuit according to claim 6, characterized in that: The control unit is used for: In the first temperature range, the resistance value of the adjustable resistor is controlled to be positively correlated with the supply voltage.

8. The temperature compensation circuit according to claim 3, characterized in that: The regulating unit comprises one or more parallel resistor branches; wherein at least one of the resistor branches comprises a first switch and a third resistor connected in series; Alternatively, the adjustment unit comprises a plurality of resistance units connected in series, wherein at least one of the resistance units comprises a first switch and a third resistor connected in parallel; The control unit is used to control the first switch to be turned on or off according to a comparison result output by the voltage comparison unit within the first temperature range, so that the resistance value of the adjustment unit is positively correlated with the supply voltage.

9. The temperature compensation circuit according to claim 8, characterized in that: There are multiple first switches, and the control unit adjusts the resistance of the adjustable resistor by adjusting the number of the first switches that are turned on.

10. The temperature compensation circuit according to claim 1, characterized in that: The regulating module is further used to detect the supply voltage of the power amplifier within the third temperature range, and to adjust a second slope between the second compensation signal and temperature according to the supply voltage, wherein the supply voltage is negatively correlated with the second slope.

11. The temperature compensation circuit according to claim 10, characterized in that: The regulating module includes an adjustable resistor, and within the third temperature range, the resistance of the adjustable resistor is configured to be negatively correlated with the supply voltage.

12. The temperature compensation circuit according to any one of claims 1 to 11, characterized in that: The temperature compensation circuit further includes a detection module, which is used to enable the adjustment module when a detection voltage positively correlated with the operating temperature of the power amplifier is less than a preset first threshold voltage, or when a detection voltage negatively correlated with the operating temperature of the power amplifier is greater than a preset second threshold voltage; The temperature value corresponding to the first threshold voltage is within a second temperature interval, the temperature value corresponding to the second threshold voltage is within a second temperature interval, and the second temperature interval is between the first temperature interval and the third temperature interval.

13. The temperature compensation circuit according to claim 12, characterized in that: The detection module includes a second comparator, wherein a first input terminal of the second comparator is used to receive the detection voltage, a second input terminal of the second comparator is used to receive the first threshold voltage or the second threshold voltage, an output terminal of the second comparator is connected to the adjustment module, and the adjustment module is used to detect the power supply voltage of the power amplifier and adjust the first slope according to the supply voltage when the result output by the second comparator is that the detection voltage is less than the first threshold voltage or the detection voltage is greater than the second threshold voltage.

14. The temperature compensation circuit according to any one of claims 1 to 11, characterized in that: 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 inject a first positive temperature coefficient current into the compensation node, and the first zero temperature compensation unit is used to extract a first zero temperature coefficient current from the compensation node; and in the first temperature range, when the first positive temperature coefficient current is less than the first zero temperature coefficient current, the first temperature compensation module outputs the first compensation signal to the compensation node; 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 inject a second positive temperature coefficient current into the compensation node, and the second zero temperature compensation unit is used to extract a second zero temperature coefficient current from the compensation node; and in the third temperature range, when the second positive temperature coefficient current is greater than the second zero temperature coefficient current, the second temperature compensation module outputs the second compensation signal to the compensation node.

15. The temperature compensation circuit according to claim 14, characterized in that: The difference current between the first zero temperature coefficient current and the first positive temperature coefficient current is negatively correlated with the first compensation signal; A difference current between the second positive temperature coefficient current and the second zero temperature coefficient current is positively correlated with the second compensation signal.

16. The temperature compensation circuit according to claim 14, characterized in that: The temperature compensation circuit further includes a voltage-current conversion module, which is connected between the compensation node and the bias circuit, and is used to convert the compensation signal output by the compensation node into a compensation current, and input the compensation current into the bias circuit; The first compensation signal is positively correlated with the bias signal output by the bias circuit; the second compensation signal is positively correlated with the bias signal output by the bias circuit.

17. The temperature compensation circuit according to claim 14, characterized in that: In the first temperature range, when the first zero temperature coefficient current is greater than the first positive temperature coefficient current, a difference current between the first zero temperature coefficient current and the first positive temperature coefficient current is configured to be positively correlated with the supply voltage.

18. The temperature compensation circuit according to claim 14, characterized in that: In the third temperature range, when the second zero temperature coefficient current is less than the second positive temperature coefficient current, a difference current between the second zero temperature coefficient current and the second positive temperature coefficient current is configured to be negatively correlated with the supply voltage.

19. The temperature compensation circuit according to claim 1, characterized in that: The first temperature compensation module includes a first zero temperature compensation unit and a first negative temperature compensation unit connected to the first zero temperature compensation unit, the first zero temperature compensation unit is used to inject a first zero temperature coefficient current into the compensation node, and the first negative temperature compensation unit is used to extract a first negative temperature coefficient current from the compensation node; And in the first temperature range, when the first negative temperature coefficient current is greater than the first zero temperature coefficient current, the first temperature compensation module outputs the first compensation signal to the compensation node; The second temperature compensation module comprises a second zero temperature compensation unit and a second negative temperature compensation unit connected to the second zero temperature compensation unit, the second zero temperature compensation unit is used to inject a second zero temperature coefficient current into the compensation node, and the second negative temperature compensation unit is used to extract a second negative temperature coefficient current from the compensation node; Furthermore, in the third temperature range, when the second zero temperature coefficient current is greater than the second negative temperature coefficient current, the second temperature compensation module outputs the second compensation signal to the compensation node.

20. The temperature compensation circuit according to claim 19, characterized in that: In the first temperature range, when the first negative temperature coefficient current is greater than the first zero temperature coefficient current, a difference current between the first negative temperature coefficient current and the first zero temperature coefficient current is configured to be positively correlated with the supply voltage.

21. The temperature compensation circuit according to claim 19, characterized in that: In the third temperature range, when the second zero temperature coefficient current is greater than the second negative temperature coefficient current, a difference current between the second zero temperature coefficient current and the second negative temperature coefficient current is configured to be negatively correlated with the supply voltage.

22. The temperature compensation circuit according to claim 1, characterized in that: 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.

23. A power amplifier, characterized in that: The power amplifier comprises a bias circuit, a power amplification circuit and a temperature compensation circuit as described in any one of claims 1 to 22, wherein the bias circuit connects the temperature compensation circuit and the power amplification circuit.

24. A radio frequency front-end module, characterized in that: The RF front-end module includes a power amplifier chip and a control chip, the power amplifier chip is integrated with a power amplifier circuit, the control chip is integrated with a temperature compensation circuit as described in any one of claims 1 to 22, and the power amplifier chip or the control chip is also integrated with a bias circuit, the input end of the bias circuit is connected to the temperature compensation circuit, and the output end of the bias circuit is connected to the power amplifier circuit.

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