CN211123689U - Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment - Google Patents
Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment Download PDFInfo
- Publication number
- CN211123689U CN211123689U CN201922235981.9U CN201922235981U CN211123689U CN 211123689 U CN211123689 U CN 211123689U CN 201922235981 U CN201922235981 U CN 201922235981U CN 211123689 U CN211123689 U CN 211123689U
- Authority
- CN
- China
- Prior art keywords
- power amplifier
- circuit
- current
- amplifier module
- main control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to an auxiliary control circuit, power amplifier module and communications facilities of power amplifier module. The auxiliary control circuit of the power amplification module comprises a main control chip, a current detection circuit and a logarithmic operation circuit. The detection input end of the current detection circuit is used for accessing to-be-detected voltage of a power supply channel of a power amplifier tube of the power amplifier module. The detection output end of the current detection circuit is electrically connected with the inverting input end of the logarithmic operation circuit. The positive phase input end of the logarithm arithmetic circuit is grounded. The output end of the logarithm arithmetic circuit is electrically connected with the detection input end of the main control chip. The main control chip is used for measuring and calculating to obtain the power amplifier current corresponding to the voltage to be measured after receiving the voltage signal output by the logarithm operation circuit. The output and input relation of the logarithmic operation circuit is utilized, so that the current detection precision of the power amplifier module is variable, the problem that the detection precision of the traditional power amplifier current detection mode is not high is effectively solved, and the effect of greatly improving the current detection precision of the power amplifier is achieved.
Description
Technical Field
The utility model relates to a current detection technical field especially relates to an auxiliary control circuit, power amplifier module and communication equipment of power amplifier module.
Background
With the continuous development of power electronic technology, in various communication devices of modern communication systems, current detection of a power amplifier module is an essential link, the working current of the power amplifier module in the communication device can be determined through the current detection, and meanwhile, the detected working current can be used as an alarm or power amplifier feedback control quantity of the communication system. The power amplification module is used as an important component in a communication system and mainly plays a role in carrying out power amplification on communication signals so as to achieve the purposes of wider coverage and higher data transmission quantity.
For the current detection of the power amplifier module, the traditional current detection modes include detection resistance and integrated operational amplifier detection, current mutual inductance detection, hall sensing detection, optical coupling isolation current detection, capacitance isolation current detection and the like. However, realize the utility model discloses an in-process, it has the not high problem of detection precision to discover that traditional power amplifier current detection mode exists.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide an auxiliary control circuit of a power amplifier module, a power amplifier module and a communication device for solving the above problems of the conventional power amplifier current detection method.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
on one hand, the embodiment of the utility model provides an auxiliary control circuit of power amplifier module, including main control chip, current detection circuit and logarithmic operation circuit; the detection input end of the current detection circuit is used for accessing to-be-detected voltage of a power supply channel of a power amplifier tube of the power amplifier module, and the detection output end of the current detection circuit is electrically connected with the inverting input end of the logarithmic operation circuit;
the positive phase input end of the logarithmic operation circuit is grounded, the output end of the logarithmic operation circuit is electrically connected with the detection input end of the main control chip, and the main control chip is used for measuring and calculating to obtain the power amplifier current corresponding to the voltage to be measured after receiving the voltage signal output by the logarithmic operation circuit.
In one embodiment, the auxiliary control circuit of the 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 and the inverting input end of the logarithmic operation circuit, and the other end of the filter capacitor C is grounded.
In one embodiment, the auxiliary control circuit of the power amplifier module further includes an automatic gate voltage adjusting circuit, and an input end of the automatic gate voltage adjusting circuit is electrically connected to the main control chip;
the grid voltage automatic adjusting circuit is used for adjusting the grid voltage of the power amplification tube of the power amplification module after receiving the grid voltage adjusting signal output by the main control chip.
In one embodiment, the auxiliary control circuit of the power amplifier module further includes a power amplifier alarm circuit, an input end of the power amplifier alarm circuit is electrically connected to the main control chip, and the power amplifier alarm circuit is configured to perform an overcurrent alarm on the operating current of the power amplifier module after receiving an alarm signal output by the main control chip.
In one embodiment, the main control chip is an MCU, a DSP chip or an FPGA chip.
In one embodiment, the logarithmic operation circuit is a temperature compensated logarithmic amplifier.
On the other hand, the power amplifier module comprises the auxiliary control circuit of the power amplifier module.
In another aspect, a communication device is also provided, which includes the power amplifier module.
In one embodiment, the communication device further includes a current display device electrically connected to the main control chip of the power amplifier module;
and the current display device is used for displaying the current data of the power supply channel of the power amplifier tube of the power amplifier module after receiving the current display signal output by the main control chip.
In one embodiment, the communication device is any one of a repeater device, a radio remote device, a track power amplifier device, an integrated power amplifier and a receiver.
One of the above technical solutions has the following advantages and beneficial effects:
the auxiliary control circuit of the power amplifier module, the power amplifier module and the communication equipment have the advantages that the logarithmic operation circuit is connected into the power amplifier current detection link, and the output and input relation of the logarithmic operation circuit is utilized, so that the current detection precision of the power amplifier module is variable. Compared with the working current, the static current is usually much lower, the required measurement precision is higher, therefore, the device can be matched with a main control chip through a current detection circuit, a logarithmic operation circuit is matched with the main control chip, the high-precision measurement of the static current is realized, meanwhile, the measurement precision of the working current of a power amplifier tube power supply path can be well met, the detection precision of the current detection circuit is avoided to be single, the defect that the detection precision of the static current cannot be effectively improved when the current detection of the whole process of the power amplifier tube power supply path is completed is overcome, the problem that the detection precision of the traditional power amplifier current detection mode is not high is effectively solved, and the effect of greatly improving the detection precision of the power.
Drawings
Fig. 1 is a block diagram of a radio frequency link of one of conventional power amplifier modules;
FIG. 2 is a schematic diagram of a relationship curve between voltage and current of a conventional power amplifier current detection;
fig. 3 is a schematic diagram of a first structure of an auxiliary control circuit of a power amplifier module according to an embodiment;
FIG. 4 is a schematic diagram illustrating a voltage-current relationship curve of the power amplifier current detection according to the present application in one embodiment;
fig. 5 is a schematic diagram of a second structure of an auxiliary control circuit of the power amplifier module in an embodiment;
fig. 6 is a schematic diagram of a third structure of an auxiliary control circuit of a power amplifier module according to an embodiment;
fig. 7 is a fourth schematic diagram of an auxiliary control circuit of the power amplifier module according to an embodiment;
fig. 8 is a fifth structural diagram of an auxiliary control circuit of the power amplifier module according to an embodiment;
fig. 9 is a schematic structural diagram of a power amplifier current detection circuit portion of the communication device in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The power amplifier module mainly comprises a radio frequency link and an auxiliary control circuit. The radio frequency link part is mainly composed of gain attenuation circuits, pre-pushing stage low-power amplifier tubes, pushing stage middle-power amplifier tubes, final-stage high-power amplifier tubes and other power amplifier devices, isolators and the like in a cascade mode. According to the requirement of the gain of the power amplifier module, two or more pre-pushing stages can be used for cascading when the gain requirement is higher. The auxiliary control circuit has any one or more 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. Fig. 1 shows a block diagram of a radio frequency link of one common power amplifier module.
Generally, the main core device of the power amplifier module is a power amplifier tube, the power amplifier tube has various types, and the common power amplifier tube is composed of L DMOS or GaN and other materials, and the gain G and the saturation power P of the power amplifier tubesatThe gain of the common power amplifier tube is 17dB-22dB in different grades. Saturation power P of power amplifier tubesatThere are different grades of 10W, 20W, 50W, 100W or 400W. The engineers can base onIn practical application, different power amplification tubes need to be selected so as to achieve the purpose of power amplification and realize corresponding link functions.
In order to amplify an input signal Pin to a gain and power value required by the actual use of the whole communication system, power amplification tubes with different power levels are generally used in a cascade manner to amplify the signal, and the gain and saturation power P of the power amplification tubes are reasonably utilizedsatThe purpose of (1). For the power amplifier tube, two important indexes need attention in practical use conditions, namely quiescent current and working current. The quiescent current is the current of the power amplifier tube when no input power enters, the magnitude of the quiescent current is controlled by the gate voltage (i.e. the gate voltages VGS1 and VGS2 shown in fig. 1) of the power amplifier tube, and the quiescent current reflects the initial operating state and the quiescent operating point of the power amplifier tube, and different saturation powers PsatThe quiescent currents of the power amplifier tubes are different. In general, the saturation power PsatThe lower the quiescent current of the power amplifier tube, e.g. 20W saturation power PsatThe quiescent current of (1) is about 100 mA-200 mA, and the saturation power P of 400W issatThe quiescent current of (2) is about 1000 mA-2000 mA.
The operating current is the dynamic current during operation compared to the quiescent current. The working current of the power amplifying tube is related to the signal power entering the power amplifying tube, and the efficiency and the working state of the power amplifying tube are reflected. Whether the power amplifier tube is in a normal working state or not can be judged through the working current, whether the efficiency is higher or lower, and the working currents of the power amplifier tubes with different efficiencies and different output powers are different. Taking the power amplifier module outputting 80W radio frequency power when supplying power at 28V as an example, the approximate working current range is 8A-10A.
In a traditional application occasion, the quiescent current of the power amplifier tube is generally read through a current detection chip so as to automatically adjust and set the grid voltage of the power amplifier tube for the power amplifier module; and reading the working current of the power amplifier tube through the current detection chip so as to calculate the efficiency of the power amplifier module and judge whether the power amplifier module is abnormal. Commonly used current detection chips are the INA138 and INA168 series of Texas Instruments (TI), MAX4173 and MAX4375 series of MAXIM, and ADM4073 series of Analog Devices (ADI). The current detection IC chip after the integration optimization has the characteristics of small volume, high precision, good performance and the like, and is widely applied to printed circuit boards.
In the application of the integrated current detection chip, no matter what kind of current detection chip, the integrated current detection chip mainly comprises the following three parts: the detection device comprises a detection resistor, a detection chip body and a detection voltage external amplifying circuit. The detection chip body processes the voltage drop through an internal precise differential amplification circuit, and then amplifies a detection voltage value obtained by the voltage drop to a proper value through a detection voltage external amplification circuit and outputs the detection voltage value.
In practical applications, the inventor finds that when the conventional current detection chip is used in a power amplifier module, the difference between the quiescent current and the operating current of the power amplifier tube is large, for example, the quiescent current ranges from 100mA to 1200mA, and the operating current ranges from 0A to 10A. The detection voltage finally output by the detection voltage external amplifying circuit is converted into a corresponding digital signal by an AD (analog-to-digital conversion) chip, enters a main control chip of an MCU (microprogrammed control unit) or other programmable logic circuits and the like, and is processed by the main control chip, or is directly converted by an AD (analog-to-digital conversion) port arranged in the main control chip. Generally, the maximum detection voltage of the analog input of the AD port cannot exceed 3.3V or 5V, and thus, in practical use, a problem exists, in which it is assumed that the maximum detectable analog voltage of the main control chip of the power amplifier module is 5V, the maximum operating current of the power amplifier module is 10A, the quiescent current of the push stage is 150mA, and the quiescent current of the final stage is 600 mA. When a current detection chip is used to perform current detection in cooperation with a main control chip, a detection voltage Vo output by the current detection chip and a detection current I measured and calculated by the main control chip based on the detection voltage Vo are in a linear proportional relationship, as shown in fig. 2.
When the current I of the current path to be detected is 10A, the detection voltage output by the current detection chip is 5.0V, and when I is 5A, the detection voltage Vo is 2.5V, that is, 1A corresponds to 500mV, and 10mA corresponds to 5mV current detection accuracy, and this current detection accuracy is fixed. In the practical use of the power amplifier module, the current detection precision is required to be higher when the quiescent current is detected, for example, the precision that 10mA corresponds to 10mV can be achieved, so that the quiescent current is accurately detected, and the accurate quiescent current control of the grid voltage of a power amplifier tube on the power amplifier module is facilitated; when the working current is detected, the detection accuracy of 1A corresponding to 50mV (10mA corresponding to 0.5mV) can also meet the actual use requirement, such as current alarm. That is to say, on the power amplifier module, the detection precision that requires is higher when the current detection chip detects quiescent current, and can be on the low side to the required detection precision of working current detection time, and this can't accomplish in traditional current detection mode.
Referring to fig. 3 and 4, in order to solve the problem of low detection accuracy in the power amplifier current detection mode, in an embodiment, an auxiliary control circuit 100 of a power amplifier module is provided, which includes a main control chip 10, a current detection circuit 12, and a logarithmic operation circuit 14. The detection input end of the current detection circuit 12 is used for accessing to-be-detected voltage of a power supply path of a 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 of the logarithmic-operation circuit 14 is grounded. The output end of the logarithmic operation circuit 14 is electrically connected with the detection input end of the main control chip 10. The main control chip 10 is configured to receive the voltage signal output by the logarithm operation circuit 14, and measure and calculate to obtain a power amplifier current corresponding to the voltage to be measured.
It is understood that the current detection circuit 12 is a current detection chip known in the art. The detection accuracy of the current detection circuit 12 is related to the amplification factor of the output voltage, that is, 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 of the current detection resistor R14 of the current detection circuit 12 and the resistance of the resistor R31 in the external amplification circuit, and the specific resistance can be selected according to the detection accuracy required in practical application.
The logarithmic-operation circuit 14 is a commercially available logarithmic-operation circuit, and is configured by replacing a feedback resistor of an inverting input proportional-operation circuit with a diode or a transistor, for example, and has a typical configuration. The output and input of the logarithmic operation circuit 14 are in a nonlinear relationship, i.e., the output voltage is in a logarithmic relationship with the input voltage. Therefore, the power amplifier module is connected to the logarithm arithmetic circuit 14 for current detection, so that the linear relation between the current of the power supply path of the power amplifier tube and the voltage to be detected can be converted into a logarithm relation. Therefore, the detection precision during the detection of the quiescent current is higher than that during the detection of the working current, the high precision required by the detection of the quiescent current is ensured, the grid voltage control precision of the power amplifier tube of the power amplifier module is improved, meanwhile, the requirement that the required detection precision is relatively low during the detection of the working current is met, and the purpose that the current detection precision is variable is realized.
The power supply path of the power amplifier tube of the power amplifier module also refers to a path for a driving source of the power amplifier module to supply power to the push-stage power amplifier tube and the final-stage power amplifier tube. The current detecting resistor at the detection input terminal of the current detection circuit 12 is electrically connected to the power amplifier tube power supply path in a conventional access manner in the art, so that the current in the power amplifier tube power supply path can flow through the current detecting resistor at the detection input terminal of the current detection circuit 12, and thus the current detection circuit 12 can detect the voltage corresponding to the flowing quiescent current (or the working current of a large current), that is, the quiescent voltage (or the working voltage), at the current detecting resistor thereof. The power amplifier current is also the quiescent current or the working current.
The main control chip 10 is an existing MCU or other type of control chip on the power amplifier module in the field, and may have a radio frequency link control function, a current measurement function, and a control function required by other power amplifier modules. The main control chip 10 may be a control chip carried by the auxiliary control circuit, a main control unit arranged on the power amplifier module, or an auxiliary control chip arranged independently. The main control chip 10 is configured to receive a voltage signal output by the current detection circuit 12 through the logarithm operation circuit 14, and then measure and calculate a corresponding quiescent current or working current, so as to automatically control gate voltage adjustment of the power amplifier tube, or be used for power amplifier current alarm and display, and the like. The main control chip 10 may directly convert the corresponding power amplifier current according to the voltage-current relationship, or may directly obtain the power amplifier current corresponding to the voltage signal by querying a pre-loaded preset voltage-current relationship table, and may specifically select the power amplifier current according to actual application requirements. It should be noted that, for convenience of description, the drawings are given by taking the current detection chip of the INA138 series as an example, and other types of current detection chips can be similarly understood.
Specifically, after the driving source of the power amplifier module starts to supply power for driving, the current detection resistor in the detection input end of the current detection circuit 12 will generate a corresponding voltage drop, when no input power enters, the current in the power supply path of the power amplifier tube is a static current, and at this time, the current detection circuit 12 correspondingly detects that the current is a static voltage. Correspondingly, when input power enters, the current in the power supply path of the power amplifier tube is the working current of the large current, and at this time, the current detection circuit 12 correspondingly detects that the current is the working voltage. The current detection circuit 12 differentially amplifies the detected voltage signal by its own internal precise differential amplification circuit, and outputs the amplified voltage signal to the logarithmic operation circuit 14. The logarithmic operation circuit 14 operates and amplifies the input voltage signal and outputs the amplified voltage signal to the main control chip 10. Due to the characteristics of the logarithmic operation circuit 14, the static voltage is amplified by a factor larger than the operating voltage. Therefore, after the main control chip 10 receives the voltage signal output by the logarithm operation circuit 14, the detection accuracy is higher when the voltage signal corresponds to the static voltage, so that the static current accuracy of the power amplification module measured and calculated by the static voltage is higher, and the adjustment accuracy of the gate voltage of the power amplification tube of the power amplification module can be effectively improved.
After the main control chip 10 receives the voltage signal output by the logarithm operation circuit 14, when the voltage signal corresponds to the working voltage, although the detection precision is relatively low in a static state, the precision requirement that the main control chip 10 calculates the corresponding working current based on the working voltage output by the logarithm operation circuit 14 in real time can be effectively met, and the accuracy of judging whether the working current is overcurrent or not is ensured. The main control chip 10 can automatically alarm the power amplifier current 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 with a equipped display unit in real time when the working current is normal.
Through the cooperation of the current detection circuit 12 and the logarithm operation circuit 14 with the main control chip 10, when the power amplifier tube power supply path of the power amplifier module has low current, the detection of static current detection is carried out by adopting the current detection circuit 12, the logarithm operation circuit 14 and the main control chip 10, and the output and input characteristics of the logarithm operation circuit 14 can enable the detection precision of the static current to be higher, so that the static current control can be carried out on the grid voltage of the power amplifier tube on the power amplifier module more favorably. When the power supply path of the power amplifier tube of the power amplifier module has high current, the logarithmic operation circuit 14 and the main control chip 10 are adopted to detect the working current, so that the method is more suitable for the general detection precision situation with larger working current when alarming. Therefore, the overall power amplifier current detection has higher precision in low current (quiescent current), and relatively lower precision in high current (working current), so that the practical application requirements of low current and high current can be met. After the logarithmic operation circuit 14 is connected, the effect of variable current detection precision is achieved in the whole current detection process, and the method can be widely applied to different power amplifier current detection application scenes. The detection accuracy curve of the auxiliary control circuit 100 of the power amplifier module is shown in fig. 4.
The auxiliary control circuit 100 of the power amplifier module makes the current detection precision of the power amplifier module variable by accessing the logarithmic operation circuit 14 in the power amplifier current detection link and utilizing the output and input relation of the logarithmic operation circuit 14. Because of quiescent current compares operating current low a lot usually, required measurement accuracy is higher, therefore can pass through current detection circuit 12, logarithm arithmetic circuit 14 cooperatees with main control chip 10, realize quiescent current's high accuracy measurement simultaneously, the measurement accuracy of the operating current of power amplifier tube power supply route also can obtain better satisfaction, thereby it is single to avoid current detection circuit 12's detection precision, the defect that can't effectively promote quiescent current's detection precision when the current detection of the whole process of power amplifier tube power supply route is accomplished, the problem that traditional power amplifier current detection mode detection precision is not high has effectively been solved, the effect of promoting power amplifier current detection precision by a wide margin has been reached.
In one embodiment, the logarithmic operation circuit 14 may be a diode instead of a feedback resistor of the inverting input proportional operation circuit, and the logarithmic operation circuit 14 is configured as shown in fig. 5. When the logarithmic operation circuit 14 of this type is used, the logarithmic relationship between the output voltage and the input voltage of the logarithmic operation circuit 14 is:
where Vo denotes an output voltage of the logarithmic operation circuit 14, Vt denotes a temperature voltage equivalent, approximately ≈ 26mV at room temperature, Vi denotes an input voltage of the logarithmic operation circuit 14, R25 denotes a resistance value of a resistor R25 of the logarithmic operation circuit 14, and Is denotes a reverse saturation current of the emitter junction.
The logarithmic operation circuit 14 may be a logarithmic operation circuit 14 formed by replacing a feedback resistor of the inverting input proportional operation circuit with a transistor, as shown in fig. 6. When the logarithmic operation circuit 14 of this type is used, the logarithmic relationship between the output voltage and the input voltage of the logarithmic operation circuit 14 is:
where R26 represents the resistance value of the resistor R26 of 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 by the logarithmic operation circuit 14, so that the purpose of different current detection precision when currents of different sizes are obtained is effectively achieved.
Referring to fig. 7, in an embodiment, the auxiliary control circuit 100 of the 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.
It can be understood that, in this embodiment, a filter capacitor C may be further connected between the detection output terminal of the current detection circuit 12 and the inverting input terminal of the logarithmic operation circuit 14 to filter noise on the detection output terminal of the current detection circuit 12, so that the output dc voltage is more stable.
The parameter specification of the filter capacitor C can be selected according to the power supply mode of the power amplifier module and the output characteristics of the current detection circuit 12 in practical application, as long as the required clutter filtering function can be effectively provided. By applying the 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, so that a voltage signal output to the logarithmic operation circuit 14 is more stable, the interference of clutter on power amplifier current detection is eliminated, and the detection precision of the power amplifier current can be further improved.
Referring to fig. 8, in an embodiment, the auxiliary control circuit 100 of the power amplifier module further includes an automatic gate voltage adjusting circuit 16. The input end of the grid voltage automatic adjusting circuit 16 is electrically connected with the main control chip 10. The gate voltage automatic adjusting circuit 16 is configured to adjust a gate voltage of a power amplifier tube of the power amplifier module after receiving the gate voltage adjusting signal output by the main control chip 10.
It can be understood that the gate voltage automatic adjusting circuit 16 is a gate voltage adjusting circuit of a power amplifier transistor known in the art, and the circuit connection with the main control chip 10 may be a direct connection or an indirect connection, and may be determined according to the type of the gate voltage adjusting circuit and the model of the chip, which are actually selected. Specifically, in the working process of the power amplifier module, after the static voltage detected and output by the current detection circuit 12 is differentially amplified to a proper voltage, the static voltage is filtered by the filter capacitor C, enters the logarithm operation circuit 14 for conversion and amplification, and is finally output to the main control chip 10, for example, an MCU processing unit of the power amplifier module. The MCU processing unit directly converts the input static voltage according to a conversion formula of the voltage and the current to obtain corresponding static current or obtains the corresponding static current in a table look-up mode, and compares the static current with the set static current to judge whether the current static current is correct or not. If not, the MCU processing unit will automatically generate a corresponding gate voltage adjusting signal and output the gate voltage adjusting signal to the gate voltage automatic adjusting circuit 16. After receiving the gate voltage adjusting signal, the gate voltage automatic adjusting circuit 16 adjusts the gate voltage of the corresponding power amplifier tube according to the gate voltage adjusting signal. After the gate voltage is adjusted, the MCU processing unit detects the output quiescent voltage again based on the current detection circuit 12, and performs quiescent current detection until the quiescent current corresponding to the detected quiescent voltage is consistent with the set quiescent current or is within the allowed floating range of the set quiescent current. If yes, the MCU processing unit receives the operating voltage from the logarithmic operation circuit 14 and detects the operating current based on the operating voltage.
Through the cooperative application of the current detection circuit 12, the logarithm operation circuit 14, the main control chip 10 and the gate voltage automatic adjustment circuit 16, the high-precision static current detection can be effectively realized, and simultaneously, the high-precision gate voltage automatic adjustment of the power amplifier tube can be realized.
In an embodiment, as shown in fig. 8, the auxiliary control circuit 100 of the power amplifier module further includes a power amplifier alarm circuit 18. The input end of the power amplifier alarm circuit 18 is electrically connected with the main control chip 10. The power amplifier warning circuit 18 is used for receiving the warning signal output by the main control chip 10 and then performing an overcurrent warning on the working current of the power amplifier module.
It can be understood that the power amplifier warning circuit 18 is a power amplifier warning circuit 18 arranged in a conventional auxiliary control circuit in the art, and the circuit connection with the main control chip 10 may be direct connection or indirect connection, and may be determined according to the type and chip model of the actually selected power amplifier warning circuit 18.
Specifically, in the working process of the power amplifier module, the working voltage detected and output by the current detection circuit 12 is subjected to differential amplification to a proper voltage, is subjected to clutter filtering by the filter capacitor C, enters the logarithm operation circuit 14 for conversion and amplification, and is finally output to the main control chip 10, for example, the MCU processing unit of the power amplifier module. The MCU processing unit directly converts the input working voltage according to a conversion formula of the voltage and the current to obtain corresponding working current, or obtains the corresponding working current in a table look-up mode, compares the working current with the set working current (or called standard dynamic current), and judges whether the current working current is overlarge or not. If yes, the MCU processing unit will automatically generate a corresponding alarm signal and output the alarm signal to the power amplifier alarm circuit 18. After receiving the alarm signal, the power amplifier alarm circuit 18 may perform a working current overcurrent alarm on the power amplifier module according to the alarm signal, for example, upload the relevant information of the current alarm to a main control unit of the device where the power amplifier module is located or an external general control system. 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 output the data of the working current to the outside for the external device to perform linkage.
Through the cooperative application of the current detection circuit 12, the logarithm 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 realized, and simultaneously, the overcurrent warning function of the working current of the power amplifier module can be reliably realized.
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 may be an MCU widely applied in the Field, may also be a DSP (Digital Signal Processing) chip, and may also be an FPGA (Field Programmable Gate Array) chip. That is, the MCU, the DSP chip or the FPGA chip is used as the auxiliary control circuit 100 of the power amplifier module of the main control chip 10, and the above-mentioned combination design of the logarithmic operation circuit 14 and the current detection circuit 12 can be applied, so that the function of variable current detection precision can be realized efficiently and at low cost. It should be noted that several types of the main control chip 10 provided in this embodiment are chip types adopted by power amplifier modules in the market, and those skilled in the art can understand that the main control chip 10 may also be other types of processors not listed in this embodiment as long as the inherent control function of the main control chip 10 itself in the auxiliary control circuit 100 of the power amplifier module can be implemented.
In one embodiment, the logarithmic operation circuit 14 is a temperature compensated logarithmic amplifier. Alternatively, various types of temperature compensated logarithmic amplifiers as are conventional in the art may be employed as the logarithmic operation circuit 14. The output signal of the logarithmic operation circuit 14 is obviously affected by the temperature, so that the required voltage signal conversion and amplification processing can be directly performed by adopting a logarithmic amplifier with temperature compensation, and the influence of the temperature change of the device on the current detection precision in the working process of the power amplification module is counteracted. The current detection accuracy can be further improved by converting and outputting the voltage signal output from the current detection circuit 12 by using the logarithmic amplifier with temperature compensation.
In an embodiment, a power amplifier module is further provided, which includes the auxiliary control circuit 100 of the power amplifier module.
It can be understood that, for the explanation of the auxiliary control circuit 100 of the power amplifier module in this embodiment, the same principle can be understood by referring to the relevant explanations in each embodiment of the auxiliary control circuit 100 of the power amplifier module, and repeated descriptions are not repeated here.
Foretell power amplifier module, the combination through main control chip 10 and above-mentioned power amplifier module's auxiliary control circuit 100 is used, make power amplifier current detection in-process current detection precision variable, when realizing quiescent current's high accuracy measurement, power amplifier tube power supply path's operating current's measurement accuracy also can obtain better satisfaction, thereby it is single to avoid current detection circuit's detection precision, the defect that can't effectively promote quiescent current's detection precision when the current detection of the complete power amplifier tube power supply path overall process is used for accomplishing, the problem that traditional power amplifier current detection mode detection precision is not high has effectively been solved, the effect of promoting power amplifier current detection precision by a wide margin has been reached.
In an embodiment, a communication device 200 is further provided, which includes the power amplifier module.
It is understood that, those skilled in the art can understand that the communication device 200 described above can be various devices applied to a power amplifier module in a communication system to perform power amplifier current detection and alarm. The communication device may further include other components besides the power amplifier module, such as, but not limited to, a memory device, a transceiver antenna, a data conversion circuit, and the like.
Referring to fig. 9, in an embodiment, the communication device 200 further includes a current display device 21. The current display device 21 is electrically connected with the main control chip 10 of the power amplifier module. The current display device 21 is configured to display current data of a power supply path of a power amplifier tube of the power amplifier module after receiving the current display signal output by the main control chip 10.
It is understood that the current display device 21 is a display device with data display, or data display and broadcast functions, such as a touch display, a non-touch display, or a common display screen without control input function. The current display device 21 and the power amplifier module may be independently disposed on the communication device 200 in the form of discrete components, or may be integrally disposed in an integrated packaging manner, and the specific disposition may be determined according to the size and shape of the current display device 21, and the auxiliary function (for example, touch input, key input, or floating operation input) provided therein.
Specifically, in the working process of the power amplifier module, the working voltage output by the logarithmic operation circuit 14 enters the MCU processing unit. The MCU processing unit directly converts the input working voltage according to a conversion formula of the voltage and the current to obtain corresponding working current, or obtains the corresponding working current in a table look-up mode, compares the working current with the set working current (or called standard dynamic current), and judges whether the current working current is overlarge or not. If yes, the MCU processing unit can link the power amplifier warning circuit 18 to perform work current overcurrent warning on the power amplifier module. If not, the MCU processing unit will continue to receive and detect the operating current based on the operating voltage output from the logarithmic operation circuit 14, and output the real-time operating current to the current display device 21. The current display device 21 may display real-time working current data through a numerical value or a curve graph, or a combination of the numerical value and the curve graph, so that an operation and maintenance person can know the working current of the power amplifier module in the communication device 200 at any time, thereby determining the working state of the power amplifier module.
Through the combined application of the power amplifier module and the current display device 21, the real-time display function of the working current in the working current detection process of the power amplifier module can be realized.
In an embodiment, the communication device 200 is any one of a repeater device, a radio remote device, a track power amplifier device, an integrated power amplifier, and a receiver.
It can be understood that the communication device 200 using the power amplifier module may be any one of a repeater device, a radio frequency remote device, a track power amplifier device, an integrated power amplifier (i.e. an integrated power amplifier device formed by integrating radio frequency power amplifier devices and other power amplifier related elements on the same structural base) and a receiver in the field, so as to improve the power amplifier current detection precision of the device, thereby more accurately controlling the gate voltage of the power amplifier tube, and completing the functions of power amplifier alarm or current display, etc. It will be understood by those skilled in the art that the foregoing list is only a few common communication devices 200, and the power amplifier module described above can also be applied to other devices that need to have a power amplifier current detection function.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An auxiliary control circuit of a power amplifier module is characterized by comprising a main control chip, a current detection circuit and a logarithmic operation circuit;
the detection input end of the current detection circuit is used for accessing to-be-detected voltage of a power supply channel of a power amplifier tube of the power amplifier module, and the detection output end of the current detection circuit is electrically connected with the inverting input end of the logarithmic operation circuit;
the positive phase input end of the logarithm operation circuit is grounded, the output end of the logarithm operation circuit is electrically connected with the detection input end of the main control chip, and the main control chip is used for measuring and calculating to obtain the power amplifier current corresponding to the voltage to be measured after receiving the voltage signal output by the logarithm operation circuit.
2. The auxiliary control circuit of the power amplifier module according to claim 1, further comprising 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, further comprising a gate voltage automatic adjusting circuit, wherein an input end of the gate voltage automatic adjusting circuit is electrically connected to the main control chip;
the grid voltage automatic adjusting circuit is used for adjusting the grid voltage of the power amplification tube of the power amplification module after receiving the grid voltage adjusting signal output by the main control chip.
4. The auxiliary control circuit of the power amplifier module according to claim 3, further comprising a power amplifier alarm circuit, wherein an input terminal of the power amplifier alarm circuit is electrically connected to the main control chip, and the power amplifier alarm circuit is configured to perform an overcurrent alarm on the working current of the power amplifier module after receiving the alarm signal output by the main control chip.
5. The auxiliary control circuit of the power amplifier module according to claim 4, wherein the main control chip is an MCU, a DSP chip or an FPGA chip.
6. The auxiliary control circuit of the power amplifier module according to claim 4 or 5, wherein the logarithmic operation circuit is a logarithmic amplifier with temperature compensation.
7. A power amplifier module comprising the auxiliary control circuit of any one of claims 1 to 6.
8. A communication device comprising the power amplifier module of claim 7.
9. The communication device according to claim 8, further comprising a current display device electrically connected to the main control chip of the power amplifier module;
and the current display device is used for displaying the current data of the power supply channel of the power amplifier tube of the power amplifier module after receiving the current display signal output by the main control chip.
10. The communication device according to claim 8 or 9, wherein the communication device is any one of a repeater device, a radio remote device, a track power amplifier device, an integrated power amplifier and a receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922235981.9U CN211123689U (en) | 2019-12-13 | 2019-12-13 | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922235981.9U CN211123689U (en) | 2019-12-13 | 2019-12-13 | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211123689U true CN211123689U (en) | 2020-07-28 |
Family
ID=71701707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922235981.9U Active CN211123689U (en) | 2019-12-13 | 2019-12-13 | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211123689U (en) |
-
2019
- 2019-12-13 CN CN201922235981.9U patent/CN211123689U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7869773B2 (en) | RF power sensing circuit | |
| US9641146B2 (en) | Apparatus and method for detecting radio frequency power | |
| US6678506B1 (en) | Extended range power detector | |
| JP4828542B2 (en) | Impedance detector | |
| US20070030064A1 (en) | Integrated laterally diffused metal oxide semiconductor power detector | |
| CN101621810A (en) | Received signal strength indication detector and method for calibrating received signal strength indication | |
| CN209710056U (en) | A kind of millimeter wave power control circuit | |
| CN102435835B (en) | Rms and envelope detector | |
| US20070170989A1 (en) | Analog amplitude detector | |
| US20230034713A1 (en) | Auxiliary control circuit for power amplification module, power amplification module, and communication device | |
| CN107508644B (en) | Feedback channel on-line calibration method and device | |
| US20070109042A1 (en) | Measuring circuit for the output of a power amplifier and a power amplifier comprising the measuring circuit | |
| CN211123689U (en) | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment | |
| JP3222367B2 (en) | Temperature measurement circuit | |
| CN104316759A (en) | Continuous wave power probe | |
| CN211403178U (en) | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment | |
| CN211123700U (en) | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment | |
| CN211123688U (en) | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment | |
| US8947164B2 (en) | Integrated technique for enhanced power amplifier forward power detection | |
| CN109655663A (en) | A kind of S-band power-sensing circuit with more gain detection amplification modes | |
| CN111123772A (en) | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment | |
| CN111141947A (en) | Auxiliary control circuit of power amplifier module, communication equipment and detection method | |
| JP3456202B2 (en) | Receive level monitor circuit | |
| CN216013479U (en) | Solid-state source heavy current direct current and temperature detection circuit | |
| WO2015048645A1 (en) | Microwave voltmeter using fully-linearized diode detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 Shenzhou Road 10, Guangzhou Science City, Guangzhou economic and Technological Development Zone, Guangzhou, Guangdong Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 Shenzhou Road 10, Guangzhou Science City, Guangzhou economic and Technological Development Zone, Guangzhou, Guangdong Patentee before: Comba Telecom System (China) Ltd. |
|
| CP01 | Change in the name or title of a patent holder |