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

Abstract

The application discloses a temperature compensation circuit, a power amplifier and a radio frequency front end module. The temperature compensation circuit comprises at least one first temperature compensation module, at least one second temperature compensation module and an adjusting module connected between the first temperature compensation module and the second temperature compensation module, wherein the adjusting module is connected with a power supply end of the power amplifier; the first temperature compensation module is configured to output a first compensation signal to a compensation node within a first temperature range, wherein the first compensation signal is positively correlated with temperature; the second temperature compensation module is configured to output a second compensation signal to the compensation node within a third temperature range, wherein the second compensation signal is positively correlated with temperature, and the minimum value of the third temperature range is greater than the maximum value of the first temperature range; and the adjusting module is configured to detect a power supply voltage of the power amplifier within the first temperature range, and adjust a first slope between the first compensation signal and the temperature according to the power supply voltage, wherein the power supply voltage is positively correlated 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

[0002] In the field of radio frequency technology, a power amplifier is usually arranged in a radio frequency front-end module to perform power amplification. With the development of mobile communication technology, the requirements for power amplifiers in communication systems are also increasing, and gain linearity is an important performance indicator for measuring power amplifiers, which directly affects the communication quality of mobile terminals. Since the performance (such as gain) of the power amplifier 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, how to appropriately compensate the temperature of the power amplifier is crucial. The related technology usually only compensates the temperature of the power amplifier in segments according to the change of the working temperature, which easily leads to poor durability of the power amplifier. SUMMARY

[0003] The present application provides a temperature compensation circuit, a power amplifier and a radio frequency front-end module, which solves the problem of poor durability of the power amplifier when the related technology compensates the temperature of the power amplifier in segments.

[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 adjusting module connected between the first temperature compensation module and the second temperature compensation module, the adjusting module being connected to a power supply end of the power amplifier.

[0005] The first temperature compensation module is configured to output a first compensation signal to a compensation node within a first temperature range, the first compensation signal being positively correlated with temperature.

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

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

[0008] In a second aspect, the present application provides a power amplifier, which comprises a bias circuit, a power amplification circuit and the temperature compensation circuit as described above, wherein the bias circuit is connected to the temperature compensation circuit and the power amplification circuit.

[0009] In a third aspect, the present application provides a radio frequency front-end module, which comprises a power amplification chip and a control chip, wherein the power amplification chip is integrated with a power amplification circuit, the control chip is integrated with a bias circuit and the temperature compensation circuit as described above, and the power amplification chip or the control chip is further integrated with a bias circuit, wherein 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 amplification circuit.

[0010] The temperature compensation circuit, the power amplifier and the radio frequency front-end module provided by the embodiments of the present application can detect the supply voltage of the power amplifier in the first temperature range, and adjust the first slope between the first compensation signal and the temperature according to the supply voltage, so that the first slope is positively correlated with the supply voltage. When the temperature is low and the supply voltage is large, increasing the first slope can increase the current drawn from the compensation node, so that the bias current input into the power amplifier is reduced, thereby the gain of the power amplifier can be reduced, and the power amplifier can be prevented from being burned out due to the large supply voltage in the low-temperature environment, and the durability of the power amplifier is improved.

[0011] It should be understood that the general description above and the detailed description below are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

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

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

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

[0016] Figure 4 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 schematic diagram of a temperature compensation circuit provided by an embodiment of the present application;

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

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

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

[0021] Figure 9 is a circuit structure schematic diagram of a voltage comparison unit provided by an embodiment of the present application;

[0022] Figure 10 is another circuit structure schematic diagram of a temperature compensation circuit provided by an embodiment of the present application;

[0023] Figure 11 is another circuit structure schematic diagram of a temperature compensation circuit provided by an embodiment of the present application;

[0024] Figure 12 is another circuit structure schematic diagram of a temperature compensation circuit provided by an embodiment of the present application;

[0025] Figure 13 is another circuit structure schematic diagram of a temperature compensation circuit provided by an embodiment of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

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

[0028] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in this specification and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0029] It is also to be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items, and that the term "at least one of' encompasses one or more items.

[0030] Some embodiments of the present application will now be described in detail in connection with the accompanying drawings. The following embodiments and features are merely exemplary and can be combined with each other in any way.

[0031] Reference will be made to Figure 1 , Figure 1 is a circuit structure schematic diagram of a radio frequency front-end module 1000 provided by an embodiment of the present application, as shown in Figure 1 The radio frequency front-end module 1000 includes a power amplification chip 11 and a control chip 12. The power amplification chip 11 has a power amplification circuit 300 integrated therein, and the control chip 12 has a temperature compensation circuit 100 integrated therein.

[0032] As shown in Figure 1 In some embodiments, the power amplification chip 11 further has a bias circuit 200 integrated therein. An input end of the bias circuit 200 is connected to the temperature compensation circuit 100, and an output end of the bias circuit 200 is connected to the power amplification circuit 300. The temperature compensation circuit 100 is configured to provide a compensation signal to the bias circuit 200.

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

[0034] It is to be noted that the radio frequency front-end module 1000 is an element that integrates two or more than two discrete devices such as radio frequency switches, low-noise amplifiers, filters, duplexers, power amplifiers, etc. into one independent module, which can improve the integration level and hardware performance, and miniaturize the volume. The radio frequency front-end module 1000 in the present embodiment can support carrier aggregation (Carrier Aggregation), dual connectivity (Dual connectivity) and multiple-input multiple-output (MIMO).

[0035] Specifically, the radio frequency front-end module 1000 can be applied to a communication device such as a smart phone, a tablet computer, a smart watch, a router, and the like. The communication device can include an electronic device such as a smart phone, a tablet computer, a smart watch, and the like, and can also include a base station, an NFC (Near Field Communication) device, and the like. The radio frequency front-end module 1000 can receive or transmit a radio frequency signal through an antenna in the communication device, and the power amplifier 100 is configured to amplify the power of a radio frequency signal to be transmitted so as to be transmitted through the antenna.

[0036] Referring to Figure 3 , Figure 3 is a circuit structure block diagram of a power amplifier provided by an embodiment of the present application.

[0037] As Figure 3 shown, the power amplifier 1 includes a temperature compensation circuit 100, a bias circuit 200, and a power amplification circuit 300. The temperature compensation circuit 100 is configured to output a compensation signal adapted to a temperature in a target temperature range to a 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 the bias circuit 200. The temperature compensation circuit 100 outputs the compensation signal to a compensation node in the target temperature range, the compensation node can be a specific circuit node in the bias circuit 200, or the bias circuit 200 is connected to the compensation node or connected 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 amplification circuit 300, and the bias circuit 200 is also configured to receive the compensation signal output by the temperature compensation circuit 100 and output a bias signal based on the compensation signal. It can be understood that the size of the bias signal output by the bias circuit 200 is related to the size of the compensation signal output by the temperature compensation circuit 100, for example, the size of the bias signal output by the bias circuit 200 is positively correlated with the size 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, the smaller the absolute value of the compensation signal.

[0040] The power amplification circuit 300 is configured to receive the bias signal and the radio frequency input signal, and output a radio frequency output signal. The power amplification factor of the power amplification circuit 300 on the radio frequency input signal 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 amplification circuit 300, the amplification factor of the power amplification circuit 300 on the radio frequency input signal 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 herein.

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

[0043] In some embodiments, the target temperature range further includes a second temperature range, which is located between the first temperature range and the third temperature range. The compensation signal output by the temperature compensation circuit 100 to the compensation node in the second temperature range is not related to temperature, for example, the compensation signal output by the temperature compensation circuit 100 to the compensation node in the second temperature range is zero, that is, in the second temperature range, 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 range, 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 range, 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] For example, the minimum value of the first temperature range is t0, and the maximum value is t1. The minimum value of the third temperature range is t2, and the maximum value is t3. Therefore, 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]. The values of t0, t1, t2, and t3 can be set as needed. Optionally, t1 can be set to any value between -40°C and 20°C, and t2 can be set to any value between 30°C and 125°C. For example, t1 can be -5°C, 0°C, or 10°C, and t2 can be 35°C, 40°C, or 50°C. It can be understood that the values of 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 can be a voltage signal, and the voltage signal can be converted into a compensation current Ic that is positively correlated thereto.

[0047] Referring to FIG. 1, the temperature compensation circuit 100 includes a first temperature compensation circuit 110, a second temperature compensation circuit 120, and a third temperature compensation circuit 130. Figure 4 In the first temperature interval, the corresponding temperature value is [t0, t1), at which time the compensation signal output by the temperature compensation circuit 100 to the compensation node is a negative number and is positively correlated to the temperature T. For example, in the first temperature interval, the reverse compensation signal can be obtained by extracting a current from the compensation node. Since the compensation signal output by the temperature compensation circuit 100 is a negative number in the first temperature interval, the corresponding compensation current Ic is also a negative number. Therefore, the higher the temperature value, the smaller the absolute value of the compensation current Ic, i.e., the smaller the current value extracted from the compensation node.

[0048] In the second temperature interval, the corresponding temperature value is [t1, t2], at which time the compensation signal output by the temperature compensation circuit 100 to the compensation node is not correlated to 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 which time the compensation signal output by the temperature compensation circuit 100 to the compensation node is positively correlated to the temperature T. For example, in the third temperature interval, the temperature compensation circuit 100 injects a current into the compensation node, so that the voltage of the compensation node rises, and the corresponding compensation current Ic is a positive value. That is, the higher the temperature value, the greater the current injected by the temperature compensation circuit 100 into the compensation node, and the 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, at this time the bias signal obtained based on the reference voltage Vref can be maintained unchanged. When working in the first temperature interval, the temperature compensation circuit 100 draws current from the compensation node, which can make the voltage of the compensation node decrease on the basis of the reference voltage Vref, the compensation current is a reverse current, and then the bias signal decreases; when working in the second temperature interval, the temperature compensation circuit 100 injects current into the compensation node, which can make the voltage of the compensation node increase on the basis of the reference voltage Vref, the compensation current is a forward current, and then the bias signal increases.

[0051] Please refer to Figure 5 In some embodiments, the temperature compensation circuit 100 is configured to provide a compensation signal to a bias circuit of a power amplifier, the temperature compensation circuit 100 is provided with a compensation node (such as the compensation node D) for connecting a target object, and the temperature compensation circuit 100 comprises at least one first temperature compensation module 10, at least one second temperature compensation module 20, and an adjusting module 30 connecting the first temperature compensation module 10 and the second temperature compensation module 20, the adjusting module 30 being connected with a power supply end V0 of the power amplifier.

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

[0053] In some embodiments, the first temperature compensation module 10 and the second temperature compensation module 20 of the temperature compensation circuit 100 output compensation signals irrelevant to temperature in a second temperature interval, the second temperature interval being 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] As Figure 5 shown, the first temperature compensation module 10 is configured to receive a first positive temperature coefficient current and a first zero temperature coefficient current, the first positive temperature coefficient current and the first zero temperature coefficient current enabling the first temperature compensation module 10 to output the first compensation signal to the compensation node D in the first temperature interval. The second temperature compensation module 20 is configured to receive a second positive temperature coefficient current and a second zero temperature coefficient current, the second positive temperature coefficient current and the second zero temperature coefficient current enabling the second temperature compensation module 20 to output the second compensation signal to the compensation node D in the third temperature interval.

[0055] 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. This 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. This 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, as are 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. It is only necessary to ensure that within the first temperature range, the first temperature compensation module 10, after receiving the first positive temperature coefficient current and the first zero temperature coefficient current, can output a first compensation signal to the compensation node D. Within the third temperature range, the second temperature compensation module 20, after receiving the second positive temperature coefficient current and the second zero temperature coefficient current, can output a second compensation signal to the compensation node D.

[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, while the magnitudes of the first zero temperature coefficient current and the second zero temperature coefficient current are independent of temperature.

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

[0060] In the second temperature interval [t1, t2], 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. Also, 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.

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

[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 (i.e., the minimum temperature value of the third temperature interval). In the above embodiment, it can be seen that the temperature compensation circuit 100 provided by the embodiment of the present application is used to provide a compensation signal to a target circuit (e.g., a bias circuit). The compensation signal output by the temperature compensation circuit 100 to the target circuit can change with the change of temperature, so that the electrical signal (e.g., a bias signal) output by the target circuit (e.g., a bias circuit) can change with the change of the compensation signal output by the temperature compensation circuit 100 to the compensation node D.

[0064] Therefore, in the 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, the compensation signal that changes with the change of temperature can be received by 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 the change of temperature to the power amplifier, i.e., the bias signal output by the bias circuit 200 is adapted to the current temperature, so as to avoid the situation that the performance of the power amplifier is deteriorated due to excessive temperature compensation.

[0065] It should be noted that when the power amplifier is segmented temperature compensated, since the gain of the power amplifier is high and the output power is large under low temperature conditions (such as the first temperature interval), and the gain of the power amplifier is positively correlated with the supply voltage, therefore under low temperature conditions, if the supply voltage is too large, the power amplifier is prone to burn out. Therefore, the adjustment module 30 is arranged in the temperature compensation circuit 100 of the present application, and the adjustment module 30 is used to detect the supply voltage of the power amplifier within the first temperature interval, and adjust the first slope between the first compensation signal and the temperature according to the supply voltage, so that the first slope is positively correlated with the supply voltage.

[0066] The above embodiment detects the supply voltage of the power amplifier within the first temperature interval, and adjusts the first slope between the first compensation signal and the temperature according to the supply voltage, so that the first slope is positively correlated with the supply voltage. Since the first compensation signal is negative within the first temperature interval, therefore when the supply voltage increases at a low temperature, increasing the first slope can increase the current extracted from the compensation node, so that the bias current input to the power amplifier decreases, thereby reducing the gain of the power amplifier, and further avoiding the power amplifier from burning out due to the supply voltage being too large under low temperature conditions, and improving the durability of the power amplifier.

[0067] Please refer to 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 within 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, 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") with the same size as the difference between the first positive temperature coefficient current and the first zero temperature coefficient current from the compensation node D, 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, after compensation within the first temperature interval, the voltage of the compensation node D is Vref-ΔV, where -ΔV is the first compensation signal, and ΔV is positively correlated with the size of the difference current extracted. Therefore, under a certain temperature point and a fixed reference voltage Vref, when the first slope between ΔV and the 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 comprises a first transistor P1 and a second transistor P2, and the first zero temperature compensation unit 102 comprises a third transistor N1 and a fourth transistor N2. The controlled ends of the first transistor P1 and the second transistor P2 are configured to be connected to the first positive temperature coefficient power supply A1, and the first positive temperature coefficient power supply A1 is configured to output a first positive temperature coefficient current. The controlled ends of the third transistor N1 and the fourth transistor N2 are configured to be connected to the first zero temperature coefficient power supply B1, and the first zero temperature coefficient power supply B1 is configured to output a first zero temperature coefficient current.

[0070] The first end of the first transistor P1 is configured to be connected to a 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 a 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, so as to inject the first positive temperature coefficient current into the compensation node D. 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, so as to extract 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 transistors are PMOS transistors, and the second type transistors are NMOS transistors.

[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, and the first transistor P1, the second transistor P2, the third transistor N1 and the fourth transistor N2 are in the on state. The first temperature compensation module 10 outputs a 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 the 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. However, since 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 flows through the third transistor N1 to output to the compensation node D, and the third transistor N1 is equivalent to be in the off state.

[0073] AsFigure 5 As shown, in some embodiments, the second temperature compensation module 20 comprises a second positive temperature compensation unit 201 and a second zero temperature compensation unit 202 connected with the second positive temperature compensation unit 201, the second positive temperature compensation unit 201 is configured to inject a second positive temperature coefficient current into the compensation node D, and the second zero temperature compensation unit 202 is configured to extract a second zero temperature coefficient current from the compensation node D. In the third temperature interval, when the temperature is greater than t2, the second positive temperature coefficient current is greater than the second zero temperature coefficient current, and 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 with the same magnitude as 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 from the second temperature compensation module to the compensation node D is a positive compensation signal, which plays a role in improving 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, 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 related to 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 comprises a fifth transistor P3 and a sixth transistor P4, and the second zero temperature compensation unit 202 comprises a seventh transistor N3 and an eighth transistor N4, wherein the controlled end of the fifth transistor P3 and the sixth transistor P4 is configured to be connected with the second positive temperature coefficient power supply A2, and the second positive temperature coefficient power supply A2 is configured to output the second positive temperature coefficient current; the controlled end of the seventh transistor N3 and the eighth transistor N4 is configured to be connected with the second zero temperature coefficient power supply B2, and the second zero temperature coefficient power supply B2 is configured to output the second zero temperature coefficient current.

[0076] Furthermore, the first end of the fifth transistor P3 is configured to be connected with the power supply VDD, the second end of the fifth transistor P3 is connected with the first end of the sixth transistor P4, the second end of the fifth transistor P3 is connected with 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 with the branch where the compensation node D is located. Wherein, 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, so as to inject 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, so as to extract 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, which are different from the third-type transistors. For example, the third-type transistors are PMOS transistors, and the fourth-type transistors are NMOS transistors.

[0078] Furthermore, when the temperature is greater than t2 in the third temperature range, transistors P3, P4, N3, and N4 are in the ON state, and the second temperature compensation module 20 outputs a second compensation signal to compensation node D via 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 compensation node D through transistor P4 to the common connection node of transistors P3 and P4. However, since the type of transistor P4 does not allow current to flow in this direction, when the temperature is less than or equal to t2, the compensation signal output by the second temperature compensation module 20 to compensation node D is 0 in both the first and second temperature ranges. That is, no current flows through transistor P4 to compensation node D in both the first and second temperature ranges, which is equivalent to 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, in one implementation, the first compensation signal and the second compensation signal can be voltage signals. 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, 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, all via a resistor R. Optionally, the resistor R can be an adjustable resistor or a fixed resistor. When the resistor R is adjustable, the first slope can be adjusted by adjusting the resistance value. When the resistor R is fixed, the first slope can be adjusted by adjusting the multiple of the difference current.

[0081] For example, the first positive temperature coefficient current can be represented as I1, the first zero temperature coefficient current can be represented as I2, and the first compensation signal can be represented as -I x R, where I = |I2 - I1|, i.e., 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 within the first temperature interval, after the first compensation signal is applied, the voltage of the compensation node is Vout = Vref - I x R. It can be understood that since the first positive temperature compensation unit 101 is used to inject the first positive temperature coefficient current I1 into the compensation node D, and the first zero temperature compensation unit 102 is used to extract the first zero temperature coefficient current I2 from the compensation node D, when the first positive temperature coefficient current I1 is less than the first zero temperature coefficient current I2, the current extracted from the compensation node D is greater than the current injected into the compensation node D, and therefore the sign of the first compensation signal is negative, which is negatively correlated with the difference current I between the first zero temperature coefficient current I2 and the first positive temperature coefficient current I1. Since I1 is a positive temperature coefficient current and I2 is a zero temperature coefficient current, the difference current I between them is also a positive temperature coefficient current, and 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 x R, it can be seen that within the first temperature interval, the first slope between the voltage Vout of the compensation node and the temperature T is negatively correlated with the resistance R, and therefore the adjustment of the first slope can be realized by adjusting the resistance R.

[0082] For example, the second positive temperature coefficient current can be represented as I3, the second zero temperature coefficient current can be represented as I4, and the second compensation signal can be represented as I x R, where the difference current I = |I3 - I4|, i.e., 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 within the third temperature interval, after the second compensation signal is applied, the voltage of the compensation node D is Vout = Vref + I x R. It can be understood that since the second positive temperature compensation unit 201 is used to inject the second positive temperature coefficient current I3 into the compensation node D, and the second zero temperature compensation unit is used to extract the second zero temperature coefficient current I4 from the compensation node D, when the second positive temperature coefficient current I3 is greater than the second zero temperature coefficient current I4, the current injected into the compensation node D is greater than the current extracted, and therefore the difference current I between the second zero temperature coefficient current I3 and the second positive temperature coefficient current I4 is positively correlated with the second compensation signal.

[0083] Please refer to Figure 6In some embodiments, the temperature compensation circuit 100 further comprises a voltage-to-current conversion module 40 connected between the compensation node D and the biasing circuit 200, the voltage-to-current conversion module 40 being configured to convert the compensation signal output by the compensation node D into a compensation current and input the compensation current into the biasing circuit 200; the first compensation signal being positively correlated with the bias signal output by the biasing circuit 200; the second compensation signal being positively correlated with the bias signal output by the biasing circuit 200.

[0084] As shown in FIG. 4, the voltage-to-current conversion module 40 can comprise an operational amplifier T3 and a second resistor R2. The inverting input terminal of the operational amplifier T3 is configured 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 biasing circuit 200. The first terminal of the second resistor R2 is connected to the output terminal of the operational amplifier T3. The second terminal of the second resistor R2 is grounded. The non-inverting input terminal of the operational amplifier T3 is connected to the first terminal of the second resistor R2. Figure 6

[0085] As shown in FIG. 4, the voltage-to-current conversion module 40 can comprise an operational amplifier T3 and a second resistor R2. The inverting input terminal of the operational amplifier T3 is configured 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 biasing circuit 200. The first terminal of the second resistor R2 is connected to the output terminal of the operational amplifier T3. The second terminal of the second resistor R2 is grounded. The non-inverting input terminal of the operational amplifier T3 is connected to the first terminal of the second resistor R2.

[0085] As shown in FIG. 4, the voltage-to-current conversion module 40 can comprise an operational amplifier T3 and a second resistor R2. The inverting input terminal of the operational amplifier T3 is configured 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 biasing circuit 200. The first terminal of the second resistor R2 is connected to the output terminal of the operational amplifier T3. The second terminal of the second resistor R2 is grounded. The non-inverting input terminal of the operational amplifier T3 is connected to the first terminal of the second resistor R2.

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

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

[0088] In some embodiments, in the first temperature interval, 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] For example, in the first temperature interval [t0, t1), when the first zero-temperature-coefficient current I2 is greater than the first positive-temperature-coefficient current I1, the difference current I=|I2-I1| between the first zero-temperature-coefficient current I2 and the first positive-temperature-coefficient current I1 is configured to be positively correlated with the supply voltage Vcc. It should be noted that according to the formula Iref=Vout / R2=(Vref-|I2-I1|×R) / R2, when the supply voltage Vcc increases, the difference current I=|I2-I1| is configured to increase, and at this time, the first slope between the current Iref and the temperature also increases, the current drawn from the compensation node D is increased, the bias signal of the bias circuit 200 is reduced, the gain of the power amplifier is reduced, and thus the power amplifier can be prevented from being burned out due to the supply voltage Vcc being too large in a low-temperature environment, and the durability of the power amplifier is improved.

[0090] In some embodiments, the adjusting module 30 is further configured to detect the supply voltage of the power amplifier in the third temperature interval, and adjust the second slope between the second compensation signal and the temperature according to the supply voltage, so that the second slope is negatively correlated with the supply voltage. Accordingly, in the third temperature interval, 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 supply voltage.

[0091] Exemplarily, in the third temperature interval (t2, t3], when the second positive temperature coefficient current I3 is less than the second zero temperature coefficient current I4, a difference current I = |I3-I4| between the second positive temperature coefficient current I3 and the second zero temperature coefficient current I4 is configured to be negatively correlated with the supply voltage Vcc. It should be noted that according to the formula Iref = Vout / R2 = (Vref + |I3-I4| x R) / R2, when the supply voltage Vcc increases, the difference current I = |I3-I4| is configured to decrease, at this time, the second slope between the current Iref and the temperature also decreases, which is equivalent to reducing the current injected to the compensation node D at a certain temperature, and the bias signal of the bias circuit 200 can be reduced, thereby reducing the gain of the power amplifier, and further avoiding the power amplifier from being burned out due to the supply voltage Vcc being too large, and improving the durability of the power amplifier.

[0092] Please refer to 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 configured to inject a first zero temperature coefficient current to the compensation node D, and the first negative temperature compensation unit 302 is configured to extract a first negative temperature coefficient current from the compensation node D; and in the first temperature interval, 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] As Figure 7 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 configured to inject a second zero temperature coefficient current to the compensation node D, and the second negative temperature compensation unit 402 is configured to extract a second negative temperature coefficient current from the compensation node D; and in the second temperature interval, 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 can be voltage signals, and the difference current between the first zero temperature coefficient current and the first negative temperature coefficient current can be converted into the first compensation signal by the resistance R, and the difference current between the second negative temperature coefficient current and the second zero temperature coefficient current can be converted into the second compensation signal by the resistance R. Alternatively, the above-mentioned resistance R can be an adjustable resistance, or can be a fixed resistance. When the above-mentioned resistance R is an adjustable resistance, the first slope can be adjusted by adjusting the resistance value of the resistance. When the above-mentioned resistance R is a fixed resistance, the first slope can be adjusted by adjusting the multiple of the difference current.

[0095] For example, in the embodiment, the first negative temperature coefficient current can be represented as I6, the first zero temperature coefficient current can be represented as I5, and the first compensation signal can be represented as -I x R, where I = |I6-I5|, and I is the negative temperature coefficient current. If the reference voltage of the compensation node is Vref when the temperature compensation is 0, then after the first compensation signal is applied, the voltage of the compensation node in the first temperature interval is Vout = Vref-I x R = Vref-|I6-I5| x R. If the voltage Vout of the compensation node is converted into the current Iref based on the resistance R2, then Iref = (Vref-I x R) / R2 = Vref / R2-|I6-I5| x R / R2. It can be seen that, in the first temperature interval, Iref is a negative temperature coefficient current and is negatively correlated with I and R.

[0096] As an implementation, the first slope is adjusted by adjusting the resistance value of the resistance R. Specifically, in the first temperature interval [t0, t1), when the first negative temperature coefficient current is greater than the first zero temperature coefficient current, the resistance value of the resistance R is adjusted according to the supply voltage Vcc, so that the resistance value of the resistance R is positively correlated with the supply voltage Vcc. Thus, at the same temperature, the higher the supply voltage Vcc, the smaller the current Iref, and thus the power amplifier can be prevented from being burned out due to an excessively large supply voltage in a low-temperature environment.

[0097] As another implementation, the first slope is adjusted by adjusting the difference current I. Specifically, in the first temperature interval, 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), when the first negative temperature coefficient current I6 is greater than the first zero temperature coefficient current I5, the difference current I = |I6-I5| between the first negative temperature coefficient current I6 and the first zero temperature coefficient current I5 is 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-|I6-I5| x R) / R2, when the supply voltage Vcc increases, the difference current I = |I6-I5| is configured to increase, that is, the coefficient between the difference current I and the temperature is increased, and at this time, the first slope between the current Iref and the temperature is also increased. This 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 thus the power amplifier can be prevented from being burned out due to an excessively large supply voltage Vcc in a low-temperature environment, and the durability of the power amplifier is improved.

[0100] Optionally, as an implementation, the first slope can be adjusted by setting a mirroring mode for the difference current I in proportion.

[0101] For example, in the embodiment, the second negative temperature coefficient current can be represented as I8, the second zero temperature coefficient current can be represented as I7, and the second compensation signal can be represented as IxR, where I = |I7-I8|, and I is a negative temperature coefficient current. If the reference voltage of the compensation node is Vref when the temperature compensation is 0, then after the second compensation signal is applied, the voltage of the compensation node in the third temperature interval is Vout = Vref + IxR = Vref + |I7-I8|xR, and if the voltage Vout of the compensation node is converted into a current Iref based on the resistance R2, then Iref = (Vref-IxR) / R2 = Vref / R2 + |I7-I8|xR / 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, when the second slope needs to be adjusted, the first slope can be adjusted by adjusting the resistance value of the resistance R. Specifically, in the third temperature interval (t2, t3], when the second zero temperature coefficient current I7 is greater than the second negative temperature coefficient current I8, the resistance value of the resistance R can be adjusted according to the supply voltage Vcc, so that the resistance value of the resistance R is negatively correlated with the supply voltage Vcc. Thus, at the same temperature, the higher the supply voltage Vcc, the smaller the current Iref, and thus the power amplifier can be prevented from being burned out due to the excessively large supply voltage.

[0103] As another implementation, 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 interval, 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], when the second zero temperature coefficient current I7 is greater than the second negative temperature coefficient current I8, the difference current I = |I7-I8| between the second zero temperature coefficient current I7 and the second negative temperature coefficient current I8 is configured to be negatively correlated with the supply voltage Vcc.

[0105] It should be noted that according to the formula Iref = Vout / R2 = (Vref + |I7-I8| x R) / R2, when the supply voltage Vcc increases, the difference current I = |I7-I8| is configured to decrease, that is, the coefficient between the difference current I and the temperature decreases, at this time, the first slope between the current Iref and the temperature also decreases, which is equivalent to reducing the current injected to 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 avoiding the power amplifier from being burned out due to the supply voltage Vcc being too large, and improving the durability of the power amplifier.

[0106] In the embodiments 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 supply voltage, it can be further determined in which voltage interval the supply voltage is, so as to determine the voltage interval corresponding to the supply voltage.

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

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

[0109] For example, different voltage intervals can be pre-configured to correspond to different slopes. For the first slope, the greater the voltage value in the voltage interval, the greater the first slope. For the second slope, the greater the voltage value in the voltage interval, the smaller the second slope. Moreover, the slope corresponding to each voltage interval can be independently adjusted, regardless of the size of the slope corresponding to other voltage intervals.

[0110] The above embodiments can achieve more accurate adjustment of the first slope between the first compensation signal and the temperature by determining the voltage interval corresponding to the supply voltage and adjusting the first slope to the slope corresponding to the voltage interval.

[0111] In some embodiments, the adjusting module is further configured to detect the supply voltage of the power amplifier in the third temperature range, and adjust the second slope between the second compensation signal and the temperature according to the supply voltage, such that the second slope is negatively correlated with the supply voltage.

[0112] Correspondingly, 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 a voltage range corresponding to the supply voltage, and the second slope can be adjusted to a slope corresponding to the voltage range. The specific process of comparing the supply voltage with the at least one fourth threshold voltage is similar to that of comparing the supply voltage with the at least one third threshold voltage, and is not described herein.

[0113] The above embodiments can reduce the bias current input to the power amplifier by reducing the second slope when the supply voltage increases, thereby reducing the gain of the power amplifier, and avoiding the power amplifier from being burned out due to the excessive supply voltage, and improving the durability of the power amplifier, by detecting the supply voltage of the power amplifier in the second temperature range and adjusting the second slope between the second compensation signal and the temperature according to the supply voltage, and the second slope being negatively correlated with the supply voltage.

[0114] Please refer to Figure 8 The adjusting module 30 can include a voltage acquisition unit 31, a voltage comparison unit 32, a control unit 33, and an adjusting unit 34.

[0115] The voltage acquisition unit 31 is configured to acquire the supply voltage Vcc of the power amplifier and input the supply voltage Vcc to the voltage comparison unit 32. For example, the voltage acquisition unit 31 can include a voltage detection circuit. The circuit structure of the voltage detection circuit can refer to related technologies, which are not described herein.

[0116] The voltage comparison unit 32 is configured to compare the supply voltage Vcc with at least one third threshold voltage Vth3 and output a comparison result to the control unit 33, the comparison result being used to indicate a voltage range corresponding to the supply voltage Vcc.

[0117] The control unit 33 is connected with the voltage comparison unit 32 and the adjusting unit 34, and is configured to control the adjusting unit 34 to adjust the first slope to a slope corresponding to the voltage range according to the comparison result output by the voltage comparison unit 32. The control unit can include one or more logic gate circuits.

[0118] For example, in the embodiments of the present application, it can be determined whether the first slope between the first compensation signal and the temperature needs to be adjusted according to the change of the supply voltage. When the first slope between the first compensation signal and the temperature needs to be adjusted according to the change of the supply voltage, it can be further determined which voltage interval the supply voltage is in, so as to determine the voltage interval corresponding to the supply voltage, and then the first slope is adjusted to the slope corresponding to the voltage interval, so that the first slope between the first compensation signal and the temperature can be adjusted more accurately. For example, in the first temperature interval, the first slope is positively correlated with the supply voltage. For example, the greater the supply voltage, the greater the first slope; the smaller the supply voltage, the smaller the first slope.

[0119] Referring to Figure 9 In some embodiments, the voltage comparison unit 32 includes at least one first comparator, the first input end of each first comparator is used to receive the supply voltage Vcc, and the second input end of each first comparator is used to receive a corresponding third threshold voltage, wherein the third threshold voltages corresponding to different first comparators are different, and the output end of the first comparator is connected with the control unit 33.

[0120] For example, the first input end of the first comparator can be a positive input end, and the second input end of the first comparator can be a negative input end. Wherein the third threshold voltages corresponding to different first comparators are different. For example, as shown in Figure 9 , 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] For example, 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 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 supply voltage Vcc is [4.3V, 4.6V).

[0122] In the above embodiments, by setting at least one first comparator in the voltage comparison unit 32, the third threshold voltages corresponding to different first comparators are different, so that the voltage interval corresponding to the supply voltage Vcc can be determined by using at least one first comparator.

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

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

[0125] It should be noted that in the embodiments of the present application, the compensation signal of the compensation node D can be adjusted by adjusting the resistance of the adjusting unit 34, and then the first slope can be adjusted, or the first slope and the second slope can be adjusted. Figure 10 In some embodiments, the adjusting unit 34 includes an adjustable resistor R, one end of the adjustable resistor R is configured 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 configured to adjust the resistance of the adjustable resistor R according to the supply voltage Vcc to adjust the first slope.

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

[0127] In some embodiments, the control unit 33 is configured to: in the first temperature interval, control the resistance of the adjustable resistor R to be positively related to the supply voltage Vcc.

[0128] For example, in the first temperature interval [t0, -t1), the resistance of the adjustable resistor R can be configured to be positively related to the supply voltage Vcc. It can be understood that according to the formula Iref=Vout / R2=(Vref-I×R) / R2, when the supply voltage Vcc increases, the adjustable resistor R is configured to increase, and at this time the first slope between the current Iref and the temperature also increases, the current drawn from the compensation node D is increased, the bias signal of the bias circuit is reduced, and thus the gain of the power amplifier is reduced, and thus the power amplifier can be prevented from being burned out due to the too large supply voltage in a low-temperature environment.

[0129] In some embodiments, when the adjusting module is further configured to adjust the second slope between the second compensation signal and the temperature according to the supply voltage in the third temperature interval, so that the second slope is negatively related to the supply voltage, correspondingly, the control unit 33 is further configured to: in the third temperature interval, control the resistance of the adjustable resistor R to be negatively related to the supply voltage Vcc.

[0130] Exemplarily, in the third temperature interval (t2, t3], the resistance of the adjustable resistor R is configured to be negatively correlated with the supply voltage Vcc. According to the formula Iref = Vout / R2 = (Vref + I x R) / R2, when the 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, the current injected into the compensation node is reduced, the bias signal of the bias circuit is reduced, thereby the gain of the power amplifier is reduced, and the power amplifier can be prevented from being burned out due to the too large supply voltage, and the durability of the power amplifier is improved.

[0131] Referring to Figure 11 In some embodiments, the adjusting unit 34 includes one or more parallel resistance branches, and at least one of the resistance branches includes a first switch and a third resistor connected in series; the control unit 33 is configured to, in the first temperature interval, control the first switch to be turned on or turned off according to the comparison result output by the voltage comparison unit 32, so that the resistance of the adjusting unit 34 is positively correlated with the supply voltage Vcc. The first switch can include switches K11,..., switch K1n, and the third resistor can include resistors R31,..., resistor R3n, and n is the number of resistance branches.

[0132] Exemplarily, the first switch K1 can 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] The number of the first switches is multiple, and the control unit 33 adjusts the resistance of the adjusting unit 34 by adjusting the number of the turned-on first switches. Exemplarily, when the supply voltage increases, the number of the resistance connected to the circuit can be reduced by reducing the number of the turned-on first switches, and thereby the resistance of the entire adjusting unit 34 is increased.

[0134] Referring to Figure 12 In other embodiments, the adjusting unit 34 includes a plurality of resistance units connected in series, and at least one of the resistance units includes a first switch and a second resistor connected in parallel. The first switch can include switches K11,..., switch K1n, and the third resistor can include resistors R31,..., resistor R3n, and n is the number of resistance units. The control unit 33 is configured to, in the first temperature interval, control the first switch to be turned on or turned off according to the comparison result output by the voltage comparison unit 32, so that the resistance of the adjusting unit 34 is positively correlated with the supply voltage Vcc.

[0135] For example, when the supply voltage Vcc increases, the resistance of the entire regulating unit 34 can be increased by reducing the number of on states of the first switch and increasing the number of resistors in the access circuit. When the supply voltage decreases, the resistance of the entire regulating unit 34 can be reduced by increasing the number of on states of the first switch and reducing the number of resistors in the access circuit.

[0136] Referring to Figure 13 In some embodiments, the temperature compensation circuit 100 can further comprise a detection module 50 configured to enable the regulating module 30 when the detection voltage positively correlated to the operating temperature of the power amplifier is less than a first threshold voltage. Alternatively, the detection module 50 can be configured to enable the regulating module 30 when the detection voltage negatively correlated to the operating temperature of the power amplifier is greater than a second threshold voltage.

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

[0138] As an implementation, 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, i.e., 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 regulating module needs to adjust the first slope according to the supply voltage within the first temperature interval, even if there is an error in the detection voltage positively correlated to the operating temperature of the power amplifier or the detection voltage negatively correlated to 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 regulating module 30 can be enabled without being affected by the error of the detection voltage. Similarly, when the regulating module also needs to adjust the second slope according to the supply voltage within the third temperature interval, even if there is an error in the detection voltage positively correlated to the operating temperature of the power amplifier or the detection voltage negatively correlated to the operating temperature of the power amplifier, it can be ensured that when the operating temperature is the minimum value of the third temperature interval, the regulating module 30 can be enabled without being affected by the error of the detection voltage.

[0139] Alternatively, the temperature value corresponding to the first threshold voltage or the temperature value corresponding to the second threshold voltage can be within the interval [t1+1 / 3(t2-t1), t1+2 / 3(t2-t1)], and for example, the temperature value corresponding to the first threshold voltage can be the middle value of the second temperature interval.

[0140] In the embodiments of the present application, the temperature detection circuit can be used to detect a detection voltage related to the working 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 related to the working temperature of the power amplifier based on the current with the temperature coefficient.

[0141] In some embodiments, the temperature detection circuit can include a detection resistor R T1 , a first end of the detection resistor R T1 is used to receive a current I T with a temperature coefficient, and a second end of the detection resistor R T1 is grounded; wherein the first end of the detection resistor is an output end of the temperature detection circuit. In this example, the current I T with the temperature coefficient flows through the detection resistor R T1 , and a voltage drop V T1 =I T *R T is generated across the detection resistor R T1 . Since the second end of the detection resistor R T1 is grounded, the detection voltage output by the first end of the detection resistor R T1 is the voltage drop V T1 across the detection resistor R T . Optionally, the current I T may have a positive temperature coefficient or a negative temperature coefficient. When the current I T has a positive temperature coefficient, the generated detection voltage is positively related to the working temperature of the power amplifier; when the current I T has a negative temperature coefficient, the generated detection voltage is negatively related to the working temperature of the power amplifier.

[0142] In other embodiments, the temperature detection circuit can detect the working temperature of the power amplifier by using a voltage dividing resistor string or at least one temperature sensitive element. The temperature sensitive element can be an element with a positive temperature characteristic or an element with a negative temperature characteristic (for example, a diode or a triode). 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 detecting the working temperature of the power amplifier by using the voltage dividing resistor string or the at least one temperature sensitive element can be known in the art, and will not be described here.

[0143] As Figure 13As shown, in some embodiments, the detecting module 50 comprises a second comparator T2, a first input terminal of the second comparator T2 is configured to receive the detecting voltage V T , a second input terminal of the second comparator T2 is configured to receive the first threshold voltage Vth1 or the second threshold voltage Vth2, and an output terminal of the second comparator T2 is connected with the adjusting module 30, the adjusting module 30 is configured to adjust the first slope according to the supply voltage Vcc of the power amplifier when the result outputted by the second comparator T2 is that the detecting voltage V T is less than the first threshold voltage Vth1 or the detecting voltage V T is greater than the second threshold voltage Vth2.

[0144] For example, the adjusting module 30 is configured to adjust the first slope according to the supply voltage Vcc when the detecting voltage V T is less than the first threshold voltage Vth1. For example, in the first temperature interval, the supply voltage is positively correlated with the first slope. When the supply voltage increases, the first slope is adjusted to increase.

[0145] In the above embodiments, since the temperature value corresponding to the first threshold voltage is one of the values in the second temperature interval, and the detecting voltage is positively correlated with the working temperature of the power amplifier, by adjusting the first slope according to the supply voltage when the detecting voltage is less than the first threshold voltage or greater than the second threshold voltage, the first slope can be increased at low temperature, so that the bias current inputted into the power amplifier is reduced, thereby the gain of the power amplifier can be reduced, and the power amplifier can be prevented from being burned out due to the too large supply voltage at low temperature, and the durability of the power amplifier is improved.

[0146] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A temperature compensation circuit, characterized in that, The temperature compensation circuit is used to provide a compensation signal to the bias circuit of the power amplifier. The temperature compensation circuit includes 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 is connected to the power supply terminal of the power amplifier. The first temperature compensation module is used to output a first compensation signal to the compensation node within a first temperature range, and the first compensation signal is positively correlated with the temperature. The second temperature compensation module is used to output a second compensation signal to the compensation node within the 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 adjustment module is used to detect the power amplifier's supply voltage within the first temperature range, and adjust the first slope between the first compensation signal and the temperature according to the supply voltage, wherein the supply voltage is positively correlated with the first slope. The temperature compensation circuit further includes a detection module, which enables the adjustment module when the detection voltage positively correlated with the operating temperature of the power amplifier is less than a preset first threshold voltage, or when the detection voltage negatively correlated with the operating temperature of the power amplifier is greater than a preset second threshold voltage; wherein the temperature value corresponding to the first threshold voltage is within a second temperature range, the temperature value corresponding to the second threshold voltage is within a second temperature range, and the second temperature range is located between the first temperature range and the third temperature range.

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

3. The temperature compensation circuit according to claim 2, characterized in that, The adjustment module includes a voltage acquisition unit, a voltage comparison unit, a control unit, and an adjustment unit; 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 the comparison result to the control unit. The comparison result is used to indicate the voltage range 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 range according to the 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 terminal of each first comparator is used to receive the supply voltage, and the second input terminal of each first comparator is used to receive a corresponding third threshold voltage. The third threshold voltages corresponding to different first comparators are different. The output terminal of the first comparator is connected to the control unit.

5. The temperature compensation circuit according to claim 3, characterized in that, Within the first temperature range, the compensation signal output 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 adjustment unit includes an adjustable resistor, one end of which 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 adjustment unit is used to adjust the resistance value of the adjustable resistor according to the power supply voltage in order to adjust the first slope.

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

8. The temperature compensation circuit according to claim 3, characterized in that, The regulating unit includes one or more parallel resistor branches; wherein at least one of the resistor branches includes a first switch and a third resistor connected in series; Alternatively, the regulating unit may include a plurality of resistor units connected in series, wherein at least one of the resistor units includes 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 the 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 power supply voltage.

9. The temperature compensation circuit according to claim 8, characterized in that, The number of the first switches is multiple, and the control unit adjusts the resistance value of the adjustment unit 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 adjustment module is also 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, wherein the power supply voltage is negatively correlated with the second slope.

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

12. The temperature compensation circuit according to claim 1, characterized in that, The detection module includes a second comparator. The first input terminal of the second comparator is used to receive the detection voltage, and the second input terminal of the second comparator is used to receive the first threshold voltage or the second threshold voltage. The output terminal of the second comparator is connected to the adjustment module. The adjustment module is used to detect the power supply voltage of the power amplifier 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, and adjust the first slope according to the power supply voltage.

13. The temperature compensation circuit according to any one of claims 1-11, 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. 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. 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.

14. The temperature compensation circuit according to claim 13, 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; 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.

15. The temperature compensation circuit according to claim 13, characterized in that, The temperature compensation circuit further includes a voltage-to-current conversion module, which is connected between the compensation node and the bias circuit. The voltage-to-current conversion module is used to convert the compensation signal output by the compensation node into a compensation current and input the compensation current to 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.

16. The temperature compensation circuit according to claim 13, characterized in that, 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.

17. The temperature compensation circuit according to claim 13, characterized in that, 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 supply voltage.

18. 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. Furthermore, 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 includes 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.

19. The temperature compensation circuit according to claim 18, characterized in that, 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.

20. The temperature compensation circuit according to claim 18, characterized in that, Within 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.

21. 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 within the second temperature range are independent of temperature, and the second temperature range is located between the first temperature range and the third temperature range.

22. A power amplifier, characterized in that, The power amplifier includes a bias circuit, a power amplification circuit, and a temperature compensation circuit as described in any one of claims 1-21, wherein the bias circuit is connected to the temperature compensation circuit and the power amplification circuit.

23. A radio frequency front-end module, characterized in that, The radio frequency front-end module includes a power amplifier chip and a control chip. The power amplifier chip integrates a power amplifier circuit, and the control chip integrates a temperature compensation circuit as described in any one of claims 1-21. The power amplifier chip or the control chip also integrates a bias circuit. The input terminal of the bias circuit is connected to the temperature compensation circuit, and the output terminal of the bias circuit is connected to the power amplifier circuit.

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