Auxiliary control circuit of power amplifier module, communication device and current detection method

Abstract

The present invention relates to an auxiliary control circuit for a power amplifier module, a communication device, and a current detection method. The auxiliary control circuit of the power amplifier module includes a main control chip, a current detection circuit, and a logarithmic operation circuit. The detection input end of the current detection circuit is used to access the voltage to be measured of the power supply path of the power amplifier tube of the power amplifier module. The detection output end of the current detection circuit is electrically connected to the inverting input end of the logarithmic operation circuit. The non-inverting input end of the logarithmic operation circuit is grounded. The output end of the logarithmic operation circuit is electrically connected to the detection input end of the main control chip. After receiving the voltage signal output by the logarithmic operation circuit, the main control chip is used to calculate the power amplifier current corresponding to the voltage to be measured. By utilizing the output-input relationship of the logarithmic operation circuit, the current detection accuracy of the power amplifier module is variable, effectively solving the problem of low detection accuracy of the traditional power amplifier current detection method, and achieving the effect of greatly improving the power amplifier current detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of current detection, and particularly to an auxiliary control circuit for a power amplifier module, a communication device, and a current detection method. Background Art

[0002] With the continuous development of power electronics technology, in various communication devices of modern communication systems, current detection of power amplifier modules is an essential link. Through current detection, the working current magnitude of the power amplifier module in the communication device can be determined, and at the same time, the detected working current magnitude can be used as an alarm or a power amplifier feedback control quantity in the communication system. As an important part of the communication system, the main function of the power amplifier module is to amplify the communication signal in power to achieve the purpose of wider coverage and higher data transmission volume.

[0003] For the current detection of power amplifier modules, traditional current detection methods include detection resistor and integrated operational amplifier detection, current mutual inductance detection, Hall sensor detection, opto-coupler isolation current detection, and capacitor isolation current detection, etc. However, in the process of implementing the present invention, it is found that the traditional power amplifier current detection methods have the problem of low detection accuracy. Summary of the Invention

[0004] Based on this, in view of the above problems existing in the traditional power amplifier current detection methods, it is necessary to provide an auxiliary control circuit for a power amplifier module, a power amplifier module, a communication device, a power amplifier current detection method, a power amplifier current detection device, and a computer-readable storage medium.

[0005] To achieve the above object, the embodiments of the present invention provide the following technical solutions:

[0006] On the one hand, the embodiments of the present invention provide an auxiliary control circuit for a power amplifier module, including a main control chip, a current detection circuit, and a logarithmic operation circuit; the detection input end of the current detection circuit is used to access the voltage to be measured in the power supply path of the power amplifier tube of the power amplifier module, and the detection output end of the current detection circuit is electrically connected to the inverting input end of the logarithmic operation circuit;

[0007] The non-inverting input end of the logarithmic operation circuit is grounded, and the output end of the logarithmic operation circuit is electrically connected to the detection input end of the main control chip. The main control chip is used to calculate the power amplifier current corresponding to the voltage to be measured after receiving the voltage signal output by the logarithmic operation circuit.

[0008] On the other hand, a power amplifier module is also provided, including the above-mentioned auxiliary control circuit for the power amplifier module.

[0009] On the other hand, a communication device is also provided, including the above-mentioned power amplifier module.

[0010] On the other hand, a method for detecting the power amplifier current is also provided, including:

[0011] Receiving the voltage signal output by the logarithmic operation circuit, and obtaining the detection voltage of the power amplifier tube power supply path corresponding to the voltage signal for the power amplifier module;

[0012] Querying a preset voltage-current relationship table according to the detection voltage to obtain the power amplifier current of the power amplifier module; the current step value of the preset voltage-current relationship table gradually increases from a small current to a large current.

[0013] On the other hand, a device for detecting the power amplifier current is also provided, including:

[0014] A voltage acquisition module, configured to receive the voltage signal output by the logarithmic operation circuit, and obtain the detection voltage of the power amplifier tube power supply path corresponding to the voltage signal for the power amplifier module;

[0015] A current acquisition module, configured to query a preset voltage-current relationship table according to the detection voltage to obtain the power amplifier current of the power amplifier module; the current step value of the preset voltage-current relationship table gradually increases from a small current to a large current.

[0016] On the other hand, a computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method for detecting the power amplifier current are implemented.

[0017] One of the above technical solutions has the following advantages and beneficial effects:

[0018] For the auxiliary control circuit, communication device and current detection method of the above power amplifier module, by connecting a logarithmic operation circuit in the power amplifier current detection link and using the output-input relationship of the logarithmic operation circuit, the current detection accuracy of the power amplifier module can be made variable. Since the static current is usually much lower than the working current and higher measurement accuracy is required, the current detection circuit, logarithmic operation circuit and main control chip can be cooperated to achieve high-precision measurement of the static current. At the same time, the measurement accuracy of the working current of the power amplifier tube power supply path can also be well satisfied, thus avoiding the defect that the detection accuracy of the current detection circuit is single and the detection accuracy of the static current cannot be effectively improved when completing the current detection of the whole process of the power amplifier tube power supply path, effectively solving the problem of low detection accuracy of the traditional power amplifier current detection method, and achieving the effect of greatly improving the power amplifier current detection accuracy. Description of the Drawings

[0019] Figure 1 It is a radio frequency link block diagram of one of the conventional power amplifier modules;

[0020] Figure 2 It is a schematic diagram of the voltage-current relationship curve of the traditional power amplifier current detection;

[0021] Figure 3 Schematic diagram of the first structure of the auxiliary control circuit of the power amplifier module in an embodiment;

[0022] Figure 4 Schematic diagram of the voltage-current relationship curve of the power amplifier current detection in an embodiment of the present application;

[0023] Figure 5 Schematic diagram of the second structure of the auxiliary control circuit of the power amplifier module in an embodiment;

[0024] Figure 6 Schematic diagram of the third structure of the auxiliary control circuit of the power amplifier module in an embodiment;

[0025] Figure 7 Schematic diagram of the fourth structure of the auxiliary control circuit of the power amplifier module in an embodiment;

[0026] Figure 8 Schematic diagram of the fifth structure of the auxiliary control circuit of the power amplifier module in an embodiment;

[0027] Figure 9 Schematic diagram of the structure of the power amplifier current detection circuit part of the communication device in an embodiment;

[0028] Figure 10 Schematic diagram of the flow of the power amplifier current detection method in an embodiment;

[0029] Figure 11 Schematic diagram of the flow of the power amplifier current detection method in another embodiment;

[0030] Figure 12 Schematic diagram of the module structure of the power amplifier current detection device in an embodiment. Detailed implementation manners

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0032] It should be noted that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific implementation manners, and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0033] The power amplifier module mainly consists of two parts: a radio frequency link and an auxiliary control circuit. Among them, the radio frequency link part is mainly composed of power amplifier devices such as a gain attenuation circuit, a pre-driver low-power amplifier transistor, a driver medium-power amplifier transistor, and a final-stage high-power amplifier transistor, cascaded with isolators. According to the requirement of the power amplifier module's gain, the higher the gain requirement, the more two or more pre-driver stages can be cascaded. The auxiliary control circuit generally includes any one or several of a power conversion circuit, a detection circuit, an IO external interface circuit, an alarm circuit, a control circuit, and a linearization circuit according to different functions. The radio frequency link block diagram of a common power amplifier module is as shown in Figure 1 shown.

[0034] Generally, the main core device of the power amplifier module is the power amplifier transistor. There are various types of power amplifier transistors, and common ones are those composed of materials such as LDMOS or GaN. The gain G and saturation power P sat of the power amplifier transistor also have different grades. The common gain of the power amplifier transistor is 17dB - 22dB. The saturation power P sat of the power amplifier transistor has different grades such as 10W, 20W, 50W, 100W, or 400W. Engineers can select different power amplifier transistors according to actual application needs to achieve the purpose of power amplification and realize the corresponding link functions.

[0035] In order to amplify the input signal Pin to the gain and power values required for the actual use of the entire communication system, usually, power amplifier transistors of different power grades are cascaded for use to amplify the signal and achieve the purpose of reasonably utilizing the gain and saturation power P sat of the power amplifier transistor. For the power amplifier transistor, there are two relatively important indicators to be concerned about in actual use, namely the static current and the operating current. The static current is the current of the power amplifier transistor when no input power enters. The magnitude of the static current is controlled by the gate voltage of the power amplifier transistor (that is, the gate voltages VGS1 and VGS2 as shown in Figure 1 ). The static current reflects the initial working state and the static operating point of the power amplifier transistor. The static currents of power amplifier transistors with different saturation powers P sat are different. Generally speaking, the lower the saturation power P sat , the lower the static current of the power amplifier transistor. For example, the static current of a 20W saturation power P sat is about 100mA - 200mA, and the static current of a 400W saturation power P sat is about 1000mA - 2000mA.

[0036] The working current is the dynamic current during operation as compared to the static current. The magnitude of the working current of the power amplifier tube is related to the signal power entering the power amplifier tube, reflecting the efficiency and working state of the power amplifier tube. Whether the power amplifier tube is in a normal working state, whether the efficiency is high or low, can be judged by the working current. The working currents of power amplifier tubes with different efficiencies and different output powers are different. Taking the power amplifier module powered by 28V and outputting 80W RF power as an example, the approximate working current range is 8A - 10A.

[0037] In traditional application scenarios, it is usually necessary to read the static current of the power amplifier tube through a current detection chip to automatically adjust and set the grid voltage of the power amplifier tube for the power amplifier module; read the working current of the power amplifier tube through a current detection chip to calculate the efficiency of the power amplifier module and judge whether the power amplifier module is abnormal. Commonly used current detection chips include INA138 and INA168 series chips of Texas Instruments (TI), MAX4173 and MAX4375 chips of MAXIM, and ADM4073 chip of Analog Devices (ADI). The integrated and optimized current detection IC chip has the characteristics of small size, high precision and good performance, and is widely used in printed circuit boards.

[0038] In the application of the integrated current detection chip, no matter what kind of current detection chip it is, it mainly consists of the following three parts: a detection resistor, the detection chip body, and an external detection voltage amplification circuit. The implementation principle is that a detection resistor on the chip detection input end is connected to the current path to be measured, and the flowing current will generate a voltage drop on the detection resistor. The detection chip body processes this voltage drop through an internal precision differential amplification circuit, and then the external detection voltage amplification circuit amplifies the detection voltage value corresponding to this voltage drop to an appropriate value and outputs it.

[0039] In practical applications, the inventor found that when traditional current detection chips are used in a power amplifier module, the difference between the static current and the operating current of the power amplification tube is relatively large. For example, the range of the static current is 100 mA to 1200 mA, while the range of the operating current is 0 A to 10 A. The detection voltage finally output by the detection voltage external amplification circuit is converted from the detection voltage in the form of an analog signal into a corresponding digital signal through an AD (analog-to-digital conversion) chip and then enters the main control chip such as an MCU or other programmable logic circuits, and then processed by the main control chip, or directly uses the internal AD (analog-to-digital conversion) port of the main control chip for conversion processing. Generally, the maximum detection voltage of the analog input of the AD port cannot exceed 3.3 V or 5 V. Then, in actual use, there will be a problem. Suppose the maximum analog voltage that the main control chip of the power amplifier module can detect is 5 V, the maximum operating current of the power amplifier module is 10 A, the static current of the driving stage is 150 mA, and the static current of the final stage is 600 mA. When using a common current detection chip in cooperation with the main control chip for current detection, the detection voltage Vo output by the current detection chip and the detection current I calculated by the main control chip based on the detection voltage Vo are in a linear proportional relationship, as Figure 2 shown.

[0040] Taking the example that when the current I of the current path to be detected is 10 A, the detection voltage output by the current detection chip is 5.0 V. When I = 5 A, the detection voltage Vo = 2.5 V. That is to say, the current detection accuracy is 500 mV corresponding to 1 A and 5 mV corresponding to 10 mA, and this current detection accuracy is fixed and unchanged. In the actual use of the power amplifier module, a higher current detection accuracy is required when detecting the static current. For example, the accuracy can reach 10 mV corresponding to 10 mA to accurately detect the static current, which is beneficial for accurately controlling the static current of the grid voltage of the power amplification tube on the power amplifier module; when detecting the operating current, since the operating current is relatively large, the detection accuracy of 50 mV corresponding to 1 A (0.5 mV corresponding to 10 mA) can also meet the actual use requirements, such as current warning. That is to say, on the power amplifier module, the current detection chip requires a higher detection accuracy when detecting the static current, while a lower detection accuracy can be required when detecting the operating current, which cannot be achieved in the traditional current detection method.

[0041] Please refer to Figure 3 and Figure 4, To solve the problem of low detection accuracy in the power amplifier current detection method, in one embodiment, an auxiliary control circuit 100 for a power amplifier module is provided, including a main control chip 10, a current detection circuit 12, and a logarithmic operation circuit 14. The detection input terminal of the current detection circuit 12 is used to access the voltage to be measured in the power supply path of the power amplifier tube of the power amplifier module. The detection output terminal of the current detection circuit 12 is electrically connected to the inverting input terminal of the logarithmic operation circuit 14. The non-inverting input terminal of the logarithmic operation circuit 14 is grounded. The output terminal of the logarithmic operation circuit 14 is electrically connected to the detection input terminal of the main control chip 10. After receiving the voltage signal output by the logarithmic operation circuit 14, the main control chip 10 is used to calculate the power amplifier current corresponding to the voltage to be measured.

[0042] It can be understood that the current detection circuit 12 is a current detection chip existing in the art. The detection accuracy of the current detection circuit 12 is related to the output voltage amplification factor. That is to say, the larger the amplification factor of the output voltage, the higher the accuracy of the current detection circuit 12. The amplification factor of the output voltage is determined by the resistance values of the current detection resistor R14 of the current detection circuit 12 and the resistor R31 in the external amplification circuit. The specific resistance values can be selected according to the detection accuracy required in actual applications.

[0043] The logarithmic operation circuit 14 is a logarithmic operation circuit existing in the market. For example, by replacing the feedback resistor of the inverting input proportional operation circuit with a diode or a transistor, a logarithmic operation circuit 14 with a typical structure is formed. The output and input of the logarithmic operation circuit 14 have a non-linear relationship, that is, the output voltage and the input voltage have a logarithmic relationship. Therefore, by connecting the logarithmic operation circuit 14 to detect the current of the power amplifier module, the linear relationship between the current in the power supply path of the power amplifier tube and the voltage to be measured can be converted into a logarithmic relationship. Thus, the detection accuracy when detecting the static current is higher than the detection accuracy when detecting the working current, ensuring the relatively high accuracy required for static current detection, while improving the grid voltage control accuracy of the power amplifier tube of the power amplifier module and meeting the requirement of relatively low detection accuracy required when detecting the working current, achieving the purpose of variable current detection accuracy.

[0044] The power supply path of the power amplifier tube of the power amplifier module also refers to the path through which the drive source of the power amplifier module supplies power to the driver stage power amplifier tube and the final stage power amplifier tube. The current detection resistor in the detection input terminal of the current detection circuit 12 adopts the traditional access method in the art and is electrically connected to the power supply path of the power amplifier tube, so that the current in the power supply path of the power amplifier tube can flow through the current detection resistor in the detection input terminal of the current detection circuit 12, so that the current detection circuit 12 can detect the voltage corresponding to the static current (or the working current of a large current) flowing through its current detection resistor, that is, the static voltage (or the working voltage). The above-mentioned power amplifier current is also the aforementioned static current or working current.

[0045] The main control chip 10 is an MCU or other type of control chip already available on the power amplifier module in the art, and may have a radio frequency link control function, a current measurement function, and other control functions required by the power amplifier module. The main control chip 10 may be a control chip that comes with the auxiliary control circuit, or may be a master control unit provided on the power amplifier module, or may be an independently provided auxiliary control chip. The main control chip 10 is used to receive the voltage signal output by the current detection circuit 12 through the logarithmic operation circuit 14, and measure the corresponding static current or working current to automatically control the gate voltage adjustment of the power amplifier tube, or to be used for power amplifier current alarm and display, etc. The main control chip 10 may directly convert the corresponding power amplifier current through the voltage-current relationship, or may directly obtain the power amplifier current corresponding to the voltage signal by querying the pre-loaded preset voltage-current relationship table, and may be selected according to actual needs. It should be noted that, for the sake of convenience in explanation, the accompanying drawings are given with the current detection chip of the INA138 series as an example in this specification, and the same can be understood for other types of current detection chips.

[0046] Specifically, after the driving source of the power amplifier module starts to supply power, the current detection resistor in the detection input end of the current detection circuit 12 will produce a corresponding voltage drop. When there is no input power, the current in the power supply path of the power amplifier tube is a static current, and the current detection circuit 12 detects the static voltage. Correspondingly, when there is input power, the current in the power supply path of the power amplifier tube is a large current working current, and the current detection circuit 12 detects the working voltage. The current detection circuit 12 amplifies the detected voltage signal through its own internal precision differential amplifier circuit and outputs it to the logarithmic operation circuit 14. The logarithmic operation circuit 14 amplifies the input voltage signal and outputs it to the main control chip 10. Due to the characteristics of the logarithmic operation circuit 14 itself, the static voltage will be amplified by a factor greater than the working voltage. Therefore, after the main control chip 10 receives the voltage signal output by the logarithmic operation circuit 14, the detection accuracy is higher when the voltage signal corresponds to a static voltage, so that the static current of the power amplifier module calculated by the static voltage has a higher accuracy, which can effectively improve the adjustment accuracy of the gate voltage of the power amplifier tube of the power amplifier module.

[0047] After the main control chip 10 receives the voltage signal output by the logarithmic operation circuit 14, when the voltage signal corresponds to the working voltage, although the detection accuracy is relatively low compared to the static state, it can effectively meet the accuracy requirement of the main control chip 10 to measure the corresponding working current in real time based on the working voltage output by the logarithmic operation circuit 14, and ensure the accuracy of judging whether the working current is overcurrent. The main control chip 10 can automatically issue an amplifier current alarm when the working current is too large, and can continuously monitor the working current of the power amplifier module or display the working current of the power amplifier module in real time with the equipped display unit when the working current is normal.

[0048] With the cooperation of the above-mentioned current detection circuit 12, logarithmic operation circuit 14 and main control chip 10, when the power amplifier tube power supply path of the power amplifier module has a low current, the current detection circuit 12, logarithmic operation circuit 14 and main control chip 10 are used for static current detection. The output and input characteristics of the logarithmic operation circuit 14 can make the detection accuracy of the static current higher, which is more conducive to the static current control of the gate voltage of the power amplifier tube on the power amplifier module. When the power amplifier tube power supply path of the power amplifier module has a high current, the logarithmic operation circuit 14, logarithmic operation circuit 14 and main control chip 10 are used for working current detection, which is more suitable for the general detection accuracy situation where the working current is relatively large during alarm. In this way, the overall power amplifier current detection can have a higher accuracy at low current (static current), and the accuracy can be relatively lower at high current (working current), which can better meet the actual application requirements of low current and high current. After connecting the logarithmic operation circuit 14, the effect of variable current detection accuracy is achieved during the whole current detection process, and it can be widely applied in different power amplifier current detection application scenarios. The detection accuracy curve of the auxiliary control circuit 100 of the above-mentioned power amplifier module is as Figure 4 shown.

[0049] For the auxiliary control circuit 100 of the above-mentioned power amplifier module, by connecting the logarithmic operation circuit 14 in the power amplifier current detection link and using the output and input relationship of the logarithmic operation circuit 14, the current detection accuracy of the power amplifier module can be made variable. Since the static current is usually much lower than the working current and higher measurement accuracy is required, the current detection circuit 12, logarithmic operation circuit 14 and main control chip 10 can be cooperated to achieve high-precision measurement of the static current. At the same time, the measurement accuracy of the working current of the power amplifier tube power supply path can also be well satisfied, thus avoiding the defect that the detection accuracy of the current detection circuit 12 is single and the detection accuracy of the static current cannot be effectively improved when completing the current detection of the whole process of the power amplifier tube power supply path, effectively solving the problem of low detection accuracy of the traditional power amplifier current detection method and achieving the effect of greatly improving the power amplifier current detection accuracy.

[0050] In one embodiment, the logarithmic operation circuit 14 can be a feedback resistor that replaces the diode in the inverting input proportional operation circuit to form the logarithmic operation circuit 14, as Figure 5 shown. When using this type of logarithmic operation circuit 14, the logarithmic relationship between the output voltage and the input voltage of the logarithmic operation circuit 14 is:

[0051]

[0052] Among them, Vo represents the output voltage of the logarithmic operation circuit 14, Vt represents the temperature voltage equivalent, which is approximately 26 mV at room temperature, Vi represents the input voltage of the logarithmic operation circuit 14, R25 represents the resistance value of the resistor R25 in the logarithmic operation circuit 14, and Is represents the reverse saturation current of the emitter junction.

[0053] The logarithmic operation circuit 14 can also be a logarithmic operation circuit 14 formed by replacing the feedback resistor of the inverting input proportional operation circuit with a triode, as Figure 6 shown. When using this type of logarithmic operation circuit 14, the logarithmic relationship between the output voltage and the input voltage of the logarithmic operation circuit 14 is:

[0054]

[0055] Among them, R26 represents the resistance value of the resistor R26 in the logarithmic operation circuit 14. Through the logarithmic operation circuit 14, the voltage signal output by the current detection circuit 12 is converted from a linear amplification mode to a logarithmic amplification mode, so as to effectively achieve the purpose of different current detection accuracies for different magnitudes of currents.

[0056] Please refer to Figure 7 , in an embodiment, the auxiliary control circuit 100 of the above power amplifier module further includes a filter capacitor C. One end of the filter capacitor C is electrically connected between the detection output end of the current detection circuit 12 and the inverting input end of the logarithmic operation circuit 14. The other end of the filter capacitor C is grounded.

[0057] It can be understood that in this embodiment, a filter capacitor C can also be connected between the detection output end of the current detection circuit 12 and the inverting input end of the logarithmic operation circuit 14 to filter out the clutter on the detection output end of the current detection circuit 12, making the output DC voltage more stable.

[0058] The parameter specifications of the filter capacitor C can be selected according to the power supply method of the power amplifier module and the output characteristics of the current detection circuit 12 in actual applications, as long as it can effectively provide the required clutter filtering function. By applying the above filter capacitor C, a filtering effect is provided between the current detection circuit 12 and the inverting input end of the logarithmic operation circuit 14, making the voltage signal output after reaching the logarithmic operation circuit 14 more stable, eliminating the interference of clutter on the power amplifier current detection, and thus further improving the detection accuracy of the power amplifier current.

[0059] Please refer to Figure 8 , in an embodiment, the auxiliary control circuit 100 of the above power amplifier module further includes a grid voltage automatic adjustment circuit 16. The input end of the grid voltage automatic adjustment circuit 16 is electrically connected to the main control chip 10. The grid voltage automatic adjustment circuit 16 is used to adjust the grid voltage of the power amplifier tube of the power amplifier module after receiving the grid voltage adjustment signal output by the main control chip 10.

[0060] It can be understood that the gate voltage automatic adjustment circuit 16 is a power amplifier tube gate voltage adjustment circuit existing in the art. The circuit connection with the main control chip 10 can be a direct connection or an indirect connection, which can be specifically determined according to the type of gate voltage adjustment circuit and chip model actually selected. Specifically, during the operation of the power amplifier module, the current detection circuit 12 detects the output static voltage, amplifies it differentially to an appropriate voltage level, filters out the clutter through the filter capacitor C, and then enters the logarithmic operation circuit 14 for conversion and amplification, and finally outputs to the main control chip 10, such as the MCU processing unit of the power amplifier module. The MCU processing unit, based on the input static voltage, directly calculates the corresponding static current according to the voltage-current conversion formula, or obtains the corresponding static current by looking up a table, and compares this static current with the set static current to determine whether the current static current is correct. If not, the MCU processing unit will automatically generate a corresponding gate voltage adjustment signal and output this gate voltage adjustment signal to the gate voltage automatic adjustment circuit 16. After receiving this gate voltage adjustment signal, the gate voltage automatic adjustment circuit 16 will adjust the gate voltage of the corresponding power amplifier tube according to this gate voltage adjustment signal. In this way, after adjusting the gate voltage, the MCU processing unit will again detect the static current based on the static voltage detected by the current detection circuit 12 until the static current corresponding to the detected static voltage is consistent with the set static current or within the floating range allowed by the set static current. If so, the MCU processing unit will receive and detect the working current based on the working voltage output by the logarithmic operation circuit 14.

[0061] Through the collaborative application of the current detection circuit 12, the logarithmic operation circuit 14, the main control chip 10, and the gate voltage automatic adjustment circuit 16, it is possible to effectively achieve high-precision static current detection while realizing the automatic adjustment of the gate voltage of the power amplifier tube with high accuracy.

[0062] In one embodiment, as Figure 8 shown, the auxiliary control circuit 100 of the above-mentioned power amplifier module further includes a power amplifier alarm circuit 18. The input end of the power amplifier alarm circuit 18 is electrically connected to the main control chip 10. The power amplifier alarm circuit 18 is used to give an overcurrent alarm for the working current of the power amplifier module after receiving the alarm signal output by the main control chip 10.

[0063] It can be understood that the power amplifier alarm circuit 18 is a power amplifier alarm circuit provided in the traditional auxiliary control circuit in the art. The circuit connection with the main control chip 10 can be a direct connection or an indirect connection, which can be specifically determined according to the type of power amplifier alarm circuit 18 and chip model actually selected.

[0064] Specifically, during the operation of the power amplifier module, the current detection circuit 12 detects the output working voltage. After differential amplification to an appropriate voltage level, it is filtered by the filter capacitor C to remove clutter and then enters the logarithmic operation circuit 14 for conversion and amplification. Finally, it is output to the main control chip 10, such as the MCU processing unit of the above-mentioned power amplifier module. Based on the input working voltage, the MCU processing unit directly calculates the corresponding working current according to the conversion formula of voltage and current, or obtains the corresponding working current by looking up a table, and compares this working current with the set working current (or called the standard dynamic current) to determine whether the current working current is too large. If so, the MCU processing unit will automatically generate a corresponding warning signal and output this warning signal to the power amplifier warning circuit 18. After receiving this warning signal, the power amplifier warning circuit 18 will perform overcurrent warning of the working current on the power amplifier module according to this warning signal, such as uploading the relevant information of the current warning to the main control unit of the device where the power amplifier module is located or an external general control system, etc. If not, the MCU processing unit will continue to receive and detect the working current based on the working voltage output by the logarithmic operation circuit 14, or the data of the working current can be output externally for linkage with external devices.

[0065] Through the collaborative application of the current detection circuit 12, the logarithmic operation circuit 14, the main control chip 10, and the power amplifier warning circuit 18, the accurate detection of the working current can be effectively achieved, and at the same time, the overcurrent warning function of the working current of the power amplifier module can be reliably realized.

[0066] In one embodiment, the main control chip 10 is an MCU, a DSP chip, or an FPGA chip. It can be understood that in the auxiliary control circuit 100 of the power amplifier module, the main control chip 10 used can be an MCU widely used in the field, or a DSP (i.e., Digital Signal Processing) chip, or an FPGA (i.e., Field-Programmable Gate Array) chip. That is to say, for the auxiliary control circuit 100 of the power amplifier module using an MCU, a DSP chip, or an FPGA chip as the main control chip 10, the combined design of the above-mentioned logarithmic operation circuit 14 and the current detection circuit 12 can be applied, so as to efficiently and low-costly realize the function of variable current detection accuracy. It should be noted that the types of the main control chip 10 given in this embodiment are the chip types used in the power amplifier module on the market. Those skilled in the art can understand that the main control chip 10 can also be other types of processors not listed in this embodiment, as long as it can realize the inherent control function of the main control chip 10 in the auxiliary control circuit 100 of the power amplifier module.

[0067] In one embodiment, the logarithmic operation circuit 14 is a logarithm amplifier with temperature compensation. Optionally, various models of logarithm amplifiers with temperature compensation conventional in the art can be used as the logarithmic operation circuit 14. The output signal in the logarithmic operation circuit 14 is significantly affected by temperature. Therefore, a logarithm amplifier with temperature compensation can be directly used to perform the required voltage signal conversion and amplification processing, so as to offset the influence of the device temperature change on the current detection accuracy during the operation of the power amplifier module. By applying the above-mentioned logarithm amplifier with temperature compensation to convert and output the voltage signal output by the current detection circuit 12, the current detection accuracy can be further improved.

[0068] In one embodiment, a power amplifier module is further provided, including the auxiliary control circuit 100 of the above-mentioned power amplifier module.

[0069] It can be understood that for the explanation of the auxiliary control circuit 100 of the power amplifier module in this embodiment, specific reference can be made to the relevant explanations in the respective embodiments of the auxiliary control circuit 100 of the above-mentioned power amplifier module for the same understanding, and details will not be repeated here.

[0070] Through the combined application of the main control chip 10 and the auxiliary control circuit 100 of the above-mentioned power amplifier module, the current detection accuracy in the power amplifier current detection process can be made variable. While achieving high-precision measurement of the static current, the measurement accuracy of the working current in the power supply path of the power amplifier tube can also be well satisfied, thus avoiding the defect that the detection accuracy of the current detection circuit is single and the detection accuracy of the static current cannot be effectively improved when completing the current detection of the entire process of the power amplifier tube power supply path, effectively solving the problem of low detection accuracy of the traditional power amplifier current detection method, and achieving the effect of greatly improving the power amplifier current detection accuracy.

[0071] In one embodiment, a communication device 200 is further provided, including the above-mentioned power amplifier module.

[0072] It can be understood by those skilled in the art that the above-mentioned communication device 200 can be various devices in a communication system that apply the power amplifier module to perform power amplifier current detection and alarm. The above-mentioned communication device may further include other components besides the power amplifier module, such as but not limited to storage devices, transceiver antennas, and data conversion circuits.

[0073] The above-mentioned communication device 200, by applying the above-mentioned power amplifier module, can make the current detection accuracy variable during the power amplifier current detection process, realize high-precision measurement of static current, and at the same time, the measurement accuracy of the working current of the power amplifier tube power supply path can be better met, thereby avoiding the defect that the detection accuracy of the current detection circuit is single, and it is unable to effectively improve the detection accuracy of the static current when completing the current detection of the entire process of the power amplifier tube power supply path. It effectively solves the problem of low detection accuracy of traditional power amplifier current detection methods, achieves the effect of greatly improving the power amplifier current detection accuracy, and can improve the equipment reliability and power amplifier performance of the communication device 200.

[0074] See also Figure 9 In one embodiment, the communication device 200 further includes a current display device 21. The current display device 21 is electrically connected to the main control chip 10 of the power amplifier module. After receiving the current display signal output by the main control chip 10, the current display device 21 is used to display the current data of the power supply path of the power amplifier tube of the power amplifier module.

[0075] It can be understood that the current display device 21 is a display device with data display, or data display and broadcasting functions, such as a touch display, a non-touch display, or a common display screen without control input function. The current display device 21 can be independently set up as discrete components with the power amplifier module on the communication device 200, or can be integrated in an integrated package. The specific setting method can be determined according to the size and shape of the current display device 21, as well as the auxiliary functions it has (such as touch input, key input, or floating operation input, etc.).

[0076] Specifically, during the operation of the power amplifier module, the operating voltage output by the logarithmic operation circuit 14 enters the MCU processing unit. Based on the input operating voltage, the MCU processing unit directly converts the corresponding operating current according to the conversion formula of voltage and current, or obtains the corresponding operating current by looking up the table, and compares the operating current with the set operating current (or standard dynamic current) to determine whether the current operating current is too large. If so, the MCU processing unit will link the power amplifier alarm circuit 18 to the power amplifier module to issue an overcurrent alarm for the operating current. If not, the MCU processing unit will continue to receive and detect the operating current based on the operating voltage output by the logarithmic operation circuit 14, and output the real-time operating current to the current display device 21. The current display device 21 can display the real-time operating current data by means of numerical values or curve graphs, or by means of a combination of numerical values and curve graphs, so that the operation and maintenance personnel can know the operating current size of the power amplifier module in the communication device 200 at any time, thereby determining the working state of the power amplifier module.

[0077] Through the combined application of the above power amplifier module and the current display device 21, the real-time display function of the working current can be realized during the detection of the working current of the power amplifier module.

[0078] In one embodiment, the communication device 200 is any one of a repeater device, a radio remote unit, a track power amplifier device, an integrated power amplifier, and a receiver.

[0079] It can be understood that the communication device 200 applying the above power amplifier module can be any one of a repeater device, a radio remote unit, a track power amplifier device, an integrated power amplifier (i.e., an integrated power amplifier device formed by integrating a radio frequency power amplifier device and other power amplifier-related components on the same structural base), and a receiver in the art, so as to improve the detection accuracy of the power amplifier current of the device, thereby more accurately controlling the grid voltage of the power amplifier tube, and completing functions such as power amplifier alarm or current display. Those skilled in the art can understand that the foregoing are only several common communication devices 200, and the above power amplifier module can also be applied to other devices that need to have the function of detecting the power amplifier current.

[0080] Please refer to Figure 10 , in one embodiment, a method for detecting the power amplifier current is further provided, including the following steps S12 and S14:

[0081] S12, receiving the voltage signal output by the logarithmic operation circuit, and obtaining the detection voltage of the power amplifier tube power supply path corresponding to the voltage signal of the power amplifier module;

[0082] S14, querying a preset voltage-current relationship table according to the detection voltage to obtain the power amplifier current of the power amplifier module; the current step value of the preset voltage-current relationship table gradually increases from a small current to a large current.

[0083] It can be understood that the detection voltage is the voltage of the voltage signal output after the current detection circuit detects and outputs to the logarithmic operation circuit from the power amplifier tube power supply path of the power amplifier module and is converted by the logarithmic operation circuit. The preset voltage-current relationship table is a pre-set corresponding relationship table between the output voltage of the logarithmic operation circuit and the detected current, which can include multiple voltage intervals, and each voltage interval can include multiple groups of output voltages and the corresponding detected currents. The current step value is also the difference between two adjacent detected currents between two adjacent voltage intervals. The current step value of the preset voltage-current relationship table gradually increases from a small current to a large current, for example but not limited to Table 1 shown below:

[0084] Table 1

[0085] Detected current Output voltage Detected current Output voltage Detected current Output voltage Detected current Output voltage 50 mA V1 400 mA V16 870 mA V31 2.0A V46 100 mA V2 450 mA V17 880 mA V32 2.5A V47 110 mA V3 500 mA V18 890 mA V33 3.0A V48 120 mA V4 550 mA V19 900 mA V34 3.5A V49 130 mA V5 600 mA V20 910 mA V35 4.0A V50 140 mA V6 650 mA V21 920 mA V36 4.5A V51 150 mA V7 700 mA V22 930 mA V37 5.0A V52 160 mA V8 750 mA V23 940 mA V38 5.8A V53 170 mA V9 800 mA V24 950 mA V39 6.6A V54 180 mA V10 810 mA V25 960 mA V40 7.4A V55 190 mA V11 820 mA V26 970 mA V41 8.2A V56 200 mA V12 830 mA V27 980 mA V42 9.0A V57 250 mA V13 840 mA V28 990 mA V43 9.8A V58 300 mA V14 850 mA V29 1000 mA V44 10.6A V59 350 mA V15 860 mA V30 1.5A V45 11.4A V60

[0086] It should be noted that the selection method of the current step value shown in Table 1 is only illustrative. Those skilled in the art can understand that in actual applications, it can be flexibly selected according to specific different detection accuracy requirements, as long as the non-constant setting of the current step value can be used to achieve different detection current measurement errors required in the cases of low current and high current. For example, in the above Table 1, if the current step value is small, the corresponding current reading error is small; conversely, the reading error is large. By presetting the voltage-current relationship table, the error value can be controlled within a small range (10 mA) in the static current ranges (such as 100 mA to 200 mA) and (800 mA to 1000 mA), while in other current detection ranges, the error value can be appropriately relaxed (such as 50 mA to 800 mA), and the larger the current, the greater the allowable error. In this way, both the gate voltage automatic adjustment control function of the power amplifier module and the current alarm function of the power amplifier module can be satisfied.

[0087] For the explanations of technical terms such as the logarithmic operation circuit, the power supply path of the power amplifier tube of the power amplifier module, and the power amplifier current in this embodiment, specific reference can be made to the corresponding explanations in the respective embodiments of the auxiliary control circuit 100 of the above power amplifier module, and no further elaboration will be made in this embodiment.

[0088] In different application scenarios of the current detection of the power amplifier module, in addition to different requirements for the current detection accuracy, there are also different requirements for the current reading error: high detection accuracy and small reading error are required when detecting the static current of the power amplifier tube, while the detection accuracy required when detecting the working current of the power amplifier tube can be relatively lower than that in the static state, and the current reading error can be relatively larger than that in the static state. Therefore, in order to improve the current detection accuracy and data processing speed, and to improve the software operation speed of the power amplifier module or the entire device, the power amplifier current can be directly obtained by means of table lookup based on the detection voltage output by the logarithmic operation circuit.

[0089] Specifically, a data processing device for table lookup processing and obtaining the power amplifier current, such as the above-mentioned main control chip, independently set microprocessor, or external general control center, etc., after receiving the voltage signal output by the logarithmic operation circuit, can read the detection voltage from the voltage signal. After the data processing device obtains the detection voltage, it queries the preset voltage-current relationship table to find the detection current that matches the detection voltage, and this matching detection current is the current power amplifier current of the power amplifier module, which is used for the static current control, current alarm, display, etc. of the power amplifier tube.

[0090] Taking Table 1 as an example, the grid voltage VGS1 of the driver stage amplifier tube is set by a data processing device to adjust the working state of the power amplifier tube, so that the quiescent current of the power amplifier tube is 150 mA. By setting the value of VGS1 of the driver stage amplifier tube, the detected voltage value read during the current detection process is V7. At this time, the quiescent current of the power amplifier tube is 150 mA. In this way, it is convenient to achieve the look-up table reading of the power amplifier current and quickly realize the automatic grid voltage adjustment function. Similarly, by setting the grid voltage VGS2 of the final stage amplifier tube through the MCU to adjust the working state of the power amplifier tube, the quiescent current of the power amplifier tube is 900 mA. By setting the value of VGS1 of the driver stage amplifier tube, the voltage value read during the current detection process is V34. At this time, the quiescent current of the power amplifier tube is 900 mA.

[0091] If it is necessary to perform an overcurrent alarm for the power amplifier current when the power amplifier current of the power amplifier module is greater than 9.0 A during actual application, then, it is only necessary to determine whether the value of the detected voltage is greater than the value of V57. If the value of the detected voltage detected is V55, then, it can be known from the data table that the current value is 7.4 A at this time.

[0092] For the above power amplifier current detection method, by receiving the detected voltage output by the logarithmic operation circuit connected in the power amplifier current detection link, the current detection accuracy of the power amplifier module can be made variable. Then, the corresponding power amplifier current is obtained by means of a look-up table. While achieving high-precision measurement of the quiescent current, the quiescent current reading error is small, and the measurement accuracy of the working current of the power supply path of the power amplifier tube can also be better satisfied. Thus, it avoids the defect that the detection accuracy of the current detection circuit is single and the detection accuracy of the quiescent current cannot be effectively improved when completing the current detection of the entire process of the power supply path of the power amplifier tube, and effectively solves the problem of low detection accuracy of the traditional power amplifier current detection method, achieving the effect of greatly improving the power amplifier current detection accuracy.

[0093] In some traditional application scenarios, according to the traditional and commonly used software look-up table method, the current step value is fixed. Usually, the table length is increased to reduce the data reading error. For example, the voltage reading range is 0 V to 4.0 V, and the current detection range is 0 A to 10 A. Then, when using the look-up table method, the data table can be set according to the relationship of 1 A = 0.4 V.

[0094] When adopting the data table scheme with small errors, if the reading error accuracy is 10 mA and the data table is set with a current step value of 10 mA, then 10 A / 10 mA = 1000 current-voltage data correspondence tables will be required. When adopting the data table scheme with medium errors, if the error accuracy is 50 mA and the data table is set with a current step value of 10 mA, then 10 A / 50 mA = 200 current-voltage data correspondence tables will be required. When adopting the data table scheme with large errors, if the error accuracy is 100 mA and the data table is set with a current step value of 10 mA, then 10 A / 100 mA = 100 current-voltage data correspondence tables will be required. The advantage of adopting the scheme with small errors is that the current reading error is small, which is beneficial to improving the detection accuracy, while the disadvantage is that the required data table is long, which will cause the operation speed of the data processing device to slow down. The advantage of adopting the scheme with large errors is that the required data table is short and the operation speed of the data processing device is fast, while the disadvantage is that the current reading error is large, which directly leads to a decrease in the current detection accuracy.

[0095] Therefore, by adopting the power amplifier current detection scheme of the above logarithmic operation circuit and using a preset voltage-current relationship table with a variable current step value to look up the table to obtain the power amplifier current, the advantages and disadvantages of the schemes with large errors and small errors in the traditional look-up table method can be effectively balanced and solved, thereby better improving the detection accuracy and efficiency of the power amplifier current.

[0096] Please refer to Figure 11 , in one embodiment, regarding the above step S14, it may specifically include the following steps S142 and S144:

[0097] S142, query the preset voltage-current relationship table according to the detected voltage to determine whether the detected voltage is a voltage value stored in the preset voltage-current relationship table;

[0098] S144, if so, output the current value corresponding to the stored voltage value as the power amplifier current.

[0099] It can be understood that in the preset voltage-current relationship table, since the adjacent detected voltages are not strictly continuous, the actually detected voltage may fall between two stored voltage values in the preset voltage-current relationship table.

[0100] Specifically, when the data processing device queries the preset voltage-current relationship table based on the detected voltage output by the logarithmic operation circuit, it will determine which stored voltage value in the preset voltage-current relationship table the detected voltage is. If there is exactly one stored voltage value that is the same as the detected voltage, the data processing device can directly determine the current corresponding to the stored voltage value as the currently detected power amplifier current.

[0101] Through the above processing steps, the data processing device can quickly obtain and output the current power amplifier current being detected. The reading error of the power amplifier current can effectively meet the requirements of practical applications and has a high output efficiency.

[0102] In one embodiment, as Figure 11 shown, regarding the above step S14, it may specifically further include the following step S146:

[0103] S146, if the detected voltage is between two adjacent voltage values in the preset voltage-current relationship table, then based on the detected voltage, the power amplifier current is obtained through the linear fitting relationship of voltage and current corresponding to the two adjacent voltage values.

[0104] It can be understood that the linear fitting relationship of voltage and current refers to the linear function relationship of voltage and current fitted based on two adjacent voltage values and their corresponding currents and other data, which can be used to quickly determine the current value corresponding to any voltage value between two adjacent voltage values.

[0105] Specifically, when the data processing device queries the preset voltage-current relationship table based on the detected voltage output by the logarithmic operation circuit and determines that the detected voltage is between two adjacent voltage values in the preset voltage-current relationship table, the data processing device can substitute the detected voltage into the linear fitting relationship of voltage and current corresponding to the two adjacent voltage values to calculate the corresponding power amplifier current. Taking Table 1 above as an example, if the detected voltage value is between V55 and V54, assuming V55 is 3.6V and the corresponding current is 7.4A, V54 is 3.5V and the corresponding current is 6.6A, and the detected voltage read is 3.53V. Then, through the linear function of the current-voltage correspondence between V55 and V54 fitted into a straight line, the power amplifier current corresponding to 3.53V is I = 6.6A + 0.03 * 0.8 / 0.1 = 6.84A.

[0106] Through the above processing steps, when the detected voltage is a voltage value not yet stored in the preset voltage-current relationship table, the power amplifier current corresponding to the detected voltage can be quickly obtained by using the linear fitting relationship of voltage and current corresponding to the voltage and current data of the two adjacent tables where the detected voltage is located.

[0107] It should be understood that although Figure 10 and Figure 11 the steps in the flowchart of Figure 10 and Figure 11At least a part of the steps may include multiple sub - steps or multiple stages. These sub - steps or stages are not necessarily executed and completed at the same moment, but can be executed at different moments. The execution order of these sub - steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or sub - steps or stages of other steps.

[0108] Please refer to Figure 12 In one embodiment, a power amplifier current detection device 300 is further provided, which includes a voltage acquisition module 31 and a current acquisition module 33. The voltage acquisition module is used to receive the voltage signal output by the logarithmic operation circuit and acquire the detection voltage of the power amplifier tube power supply path corresponding to the power amplifier module of the voltage signal. The current acquisition module 33 is used to query a preset voltage - current relationship table according to the detection voltage to acquire the power amplifier current of the power amplifier module; the current step value of the preset voltage - current relationship table gradually increases from a small current to a large current.

[0109] For the above - mentioned power amplifier current detection device 300, by receiving the detection voltage output by the logarithmic operation circuit connected in the power amplifier current detection link through the voltage acquisition module 31, the current detection accuracy of the power amplifier module can be made variable. Then, the corresponding power amplifier current is acquired in a table - looking - up manner through the current acquisition module 33. While achieving high - precision measurement of the static current, the static current reading error is small, and the measurement accuracy of the working current of the power amplifier tube power supply path can also be well satisfied. Thus, it avoids the defect that the detection accuracy of the current detection circuit is single and the detection accuracy of the static current cannot be effectively improved when completing the current detection of the entire process of the power amplifier tube power supply path, and effectively solves the problem of low detection accuracy of the traditional power amplifier current detection method, achieving the effect of greatly improving the power amplifier current detection accuracy.

[0110] In one embodiment, the current acquisition module 33 may specifically include a voltage determination module and a current output module. The voltage determination module is used to query a preset voltage - current relationship table according to the detection voltage to determine whether the detection voltage is a voltage value stored in the preset voltage - current relationship table. The current output module is used to output the current value corresponding to the stored voltage value as the power amplifier current when the detection voltage is a voltage value stored in the preset voltage - current relationship table.

[0111] In one embodiment, the current output module is further used to obtain the power amplifier current according to the detection voltage through the voltage - current linear fitting relationship corresponding to two adjacent voltage values when the detection voltage is between two adjacent voltage values in the preset voltage - current relationship table.

[0112] For the specific limitations of the power amplifier current detection device 300, reference may be made to the corresponding limitations of the power amplifier current detection method in the foregoing text, which will not be elaborated herein. Each module in the above-mentioned power amplifier current detection device 300 can be implemented in whole or in part by software, hardware, and their combination. The above-mentioned modules can be embedded in the processor in the computer device in the form of hardware or be independent of the processor, or can be stored in the memory in the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to the above-mentioned modules.

[0113] In one embodiment, the above-mentioned communication device 200 includes a memory and a processor. The memory stores a computer program, and the processor can be the above-mentioned main control chip. When the foregoing processor executes the computer program, the following steps are implemented: receiving the voltage signal output by the logarithmic operation circuit, and obtaining the detection voltage of the power amplifier tube power supply path corresponding to the voltage signal of the power amplifier module; querying a preset voltage-current relationship table according to the detection voltage to obtain the power amplifier current of the power amplifier module; the current step value of the preset voltage-current relationship table gradually increases from a small current to a large current.

[0114] Those skilled in the art can understand that in addition to the above-mentioned memory and processor, the communication device 200 in this embodiment may further include other components, which can be specifically determined according to the existing structural composition and functions of the communication device 200 in actual applications, and will not be elaborated one by one in this specification.

[0115] In one embodiment, when the foregoing processor executes the computer program, it can also implement the additional steps or sub-steps in each embodiment of the above-mentioned power amplifier current detection method.

[0116] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: receiving the voltage signal output by the logarithmic operation circuit, and obtaining the detection voltage of the power amplifier tube power supply path corresponding to the voltage signal of the power amplifier module; querying a preset voltage-current relationship table according to the detection voltage to obtain the power amplifier current of the power amplifier module; the current step value of the preset voltage-current relationship table gradually increases from a small current to a large current.

[0117] In one embodiment, when the computer program is executed by a processor, it can also implement the additional steps or sub-steps in each embodiment of the above-mentioned power amplifier current detection method.

[0118] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above various methods. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), memory bus dynamic random access memory (Rambus DRAM, abbreviated as RDRAM), and interface dynamic random access memory (DRDRAM), etc.

[0119] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0120] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An auxiliary control circuit for a power amplifier module, characterized in that, It includes a main control chip, a current detection circuit and a logarithmic operation circuit; The detection input end of the current detection circuit is used to access the voltage to be measured of the power amplifier tube power supply path of the power amplifier module, and the detection output end of the current detection circuit is electrically connected to the inverting input end of the logarithmic operation circuit; wherein, the voltage to be measured is a static voltage or a working voltage; The non-inverting input end of the logarithmic operation circuit is grounded, and the output end of the logarithmic operation circuit is electrically connected to the detection input end of the main control chip. The main control chip is used to calculate the power amplifier current corresponding to the voltage to be measured after receiving the voltage signal output by the logarithmic operation circuit; wherein, the power amplifier current is a static current or a working current; The main control chip is used to receive the voltage signal output by the logarithmic operation circuit, obtain the detection voltage of the power amplifier tube power supply path of the power amplifier module corresponding to the voltage signal, query the preset voltage-current relationship table according to the detection voltage. If the detection voltage is between two adjacent voltage values in the preset voltage-current relationship table, then according to the detection voltage, the power amplifier current is obtained through the voltage-current linear fitting relationship corresponding to the two adjacent voltage values.

2. The auxiliary control circuit of the power amplifier module according to claim 1, wherein It further includes a filter capacitor C; One end of the filter capacitor C is electrically connected between the detection output end of the current detection circuit and the inverting input end of the logarithmic operation circuit, and the other end of the filter capacitor C is grounded.

3. The auxiliary control circuit of the power amplifier module according to claim 1 or 2, characterized in that It further includes a grid voltage automatic adjustment circuit, and the input end of the grid voltage automatic adjustment circuit is electrically connected to the main control chip; The grid voltage automatic adjustment circuit is used to adjust the grid voltage of the power amplifier tube of the power amplifier module after receiving the grid voltage adjustment signal output by the main control chip.

4. The auxiliary control circuit of the power amplifier module according to claim 3, characterized in that, It further includes a power amplifier alarm circuit, and the input end of the power amplifier alarm circuit is electrically connected to the main control chip. The power amplifier alarm circuit is used to perform over-current alarm on the working current of the power amplifier module after receiving the alarm signal output by the main control chip.

5. A power amplifier module, characterized in that, It includes the auxiliary control circuit of the power amplifier module according to any one of claims 1 to 4.

6. A communication device, characterized in that, It includes the power amplifier module according to claim 5.

7. A power amplifier current detection method, characterized in that Applied to the auxiliary control circuit of the power amplifier module according to any one of claims 1 to 4, the method includes: Receiving the voltage signal output by the logarithmic operation circuit, and obtaining the detection voltage of the power amplifier tube power supply path of the power amplifier module corresponding to the voltage signal; Querying the preset voltage-current relationship table according to the detection voltage to obtain the power amplifier current of the power amplifier module; the current step value of the preset voltage-current relationship table gradually increases from a small current to a large current.

8. The power amplifier current detection method according to claim 7, wherein The step of querying the preset voltage-current relationship table according to the detection voltage to obtain the power amplifier current of the power amplifier module includes: Querying the preset voltage-current relationship table according to the detection voltage to determine whether the detection voltage is a voltage value stored in the preset voltage-current relationship table; If so, outputting the current value corresponding to the stored voltage value as the power amplifier current.

9. The power amplifier current detection method according to claim 8, wherein, The step of querying the preset voltage-current relationship table according to the detection voltage to obtain the power amplifier current of the power amplifier module further includes: If the detected voltage is between two adjacent voltage values in the preset voltage-current relationship table, the amplifier current is obtained based on the detected voltage through the linear fitting relationship between the voltage and current corresponding to the two adjacent voltage values.

10. An amplifier current detection device, characterized in that, Applied to the auxiliary control circuit of the amplifier module according to any one of claims 1 to 4, the device includes: A voltage acquisition module, configured to receive the voltage signal output by the logarithmic operation circuit and acquire the detected voltage of the power supply path of the power amplifier tube of the amplifier module corresponding to the voltage signal; A current acquisition module, configured to query the preset voltage-current relationship table according to the detected voltage and acquire the amplifier current of the amplifier module; the current step value of the preset voltage-current relationship table gradually increases from a small current to a large current.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the amplifier current detection method according to any one of claims 7 to 9 are implemented.

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