CN115061524A - Power control circuit of multimode radio station and multimode radio station - Google Patents
Power control circuit of multimode radio station and multimode radio station Download PDFInfo
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- CN115061524A CN115061524A CN202210651755.2A CN202210651755A CN115061524A CN 115061524 A CN115061524 A CN 115061524A CN 202210651755 A CN202210651755 A CN 202210651755A CN 115061524 A CN115061524 A CN 115061524A
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- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
The application discloses power control circuit and multimode radio station of multimode radio station relates to power control technical field. The power control circuit of the multimode radio station comprises a power amplifier, a directional coupler and a control loop; the output end of the radio frequency excitation signal is connected with the input end of the power amplifier; the output end of the power amplifier is connected with the input end of the directional coupler; the output end of the directional coupler is connected with the antenna, and the coupling end of the directional coupler is connected with the input end of the control loop; the output end of the control loop is connected with the input end of the power amplifier; the control loop comprises a constant envelope control loop and a non-constant envelope control loop, and the constant envelope control loop is used for carrying out power control on a constant envelope signal; the non-constant envelope control loop is used for carrying out power control on the non-constant envelope signal. Through the mode, the power control of constant envelope and non-constant envelope signals can be met, the designed algorithm is simple, and the difficulty of power control of the multimode radio station is reduced.
Description
Technical Field
The application relates to the technical field of power control, in particular to a power control circuit of a multimode radio station and the multimode radio station.
Background
With the development of the station, the power control complexity of the station is increased by the factors of broadband, multimode, multi-trial, multi-waveform, and the like of the station. The current radio station power control has a current feedback type power control mode and a voltage feedback type power control mode. The voltage feedback type power control mode is that a directional coupler between a power amplifier and an antenna port is used for connection, power coupling is carried out, then a detector is used for detecting, an obtained voltage signal is compared with a reference voltage to obtain an error voltage, and therefore the gain of the power amplifier is controlled, the power of the power amplifier is stably output, and meanwhile signal transmission is guaranteed not to be distorted. However, the current multimode radio station has modulation signals with constant envelope and non-constant envelope, the frequency hopping rate is hundreds to tens of thousands of hops per second, and the difficulty of obtaining power control is increased by combining the above factors.
Disclosure of Invention
The application provides a power control circuit of a multimode radio station and the multimode radio station, which are used for solving the problem that the power control difficulty of the multimode radio station is too high.
In order to solve the technical problem, the application adopts a technical scheme that: the power control circuit of the multimode radio station comprises a power amplifier, a directional coupler and a control loop; the power control circuit controls the power of the radio frequency excitation signal of the multimode radio station and transmits the radio frequency excitation signal after the power control through the antenna; the output end of the radio frequency excitation signal is connected with the input end of the power amplifier; the output end of the power amplifier is connected with the input end of the directional coupler; the output end of the directional coupler is connected with the antenna, and the coupling end of the directional coupler is connected with the input end of the control loop; the output end of the control loop is connected with the input end of the power amplifier; the control loop comprises a constant envelope control loop and a non-constant envelope control loop, and the constant envelope control loop is used for carrying out power control on a constant envelope signal; the non-constant envelope control loop is used for carrying out power control on the non-constant envelope signal.
The control loop further comprises a switch, and a reference voltage is input to the input end of the switch; the first output end of the switch is connected with the input end of the constant envelope control loop; a second output of the switch is connected to an input of the non-constant envelope control loop.
The non-constant envelope control loop comprises a peak detector and a first operational amplifier comparator, wherein the input end of the peak detector is connected with the coupling end of the directional coupler; the first input end of the first operational amplifier comparator is connected with the output end of the peak detector, the second input end of the first operational amplifier comparator inputs a non-constant envelope signal, the second input end of the first operational amplifier comparator is connected with the second output end of the switch, and the output end of the first operational amplifier comparator is connected with the input end of the power amplifier.
The non-constant envelope control loop further comprises a first capacitor, a first end of the first capacitor is connected with a first input end of the first operational amplifier comparator, and a second end of the first capacitor is connected with an output end of the first operational amplifier comparator.
The non-constant envelope control loop further comprises an adjustable attenuator, the input end of the adjustable attenuator is connected with the coupling end of the directional coupler, and the output end of the adjustable attenuator is connected with the input end of the peak detector.
The peak detector comprises a second capacitor, a first resistor, a first diode, a second resistor and a third capacitor, wherein the first end of the second capacitor is connected with the output end of the adjustable attenuator; the first end of the first resistor is connected with the second end of the second capacitor; the positive end of the first diode is connected with the second end of the first resistor and grounded; the negative end of the first diode is connected with the second end of the second capacitor; the positive end of the second diode is respectively connected with the second end of the second capacitor and the negative end of the first diode; the first end of the second resistor is connected with the negative end of the second diode; the second resistor is connected with the first input end of the first operational amplifier comparator; the first end of the third capacitor is grounded, and the second end of the third capacitor is connected with the second end of the second resistor.
Wherein the first diode and the second diode comprise Schottky diodes.
The constant envelope control loop comprises a mean value detector and a second operational amplifier comparator, and the input end of the mean value detector is connected with the coupling end of the directional coupler; the first input end of the second operational amplifier comparator is connected with the output end of the mean value detector, the second input end of the second operational amplifier comparator is connected with the first output end of the switch, and the output end of the second operational amplifier comparator is connected with the input end of the power amplifier.
The constant envelope control loop further comprises a fourth capacitor and a third resistor, and the first end of the fourth capacitor is connected with the first input end of the second operational amplifier comparator; the first end of the third resistor is connected with the second end of the fourth capacitor, and the third resistor is connected with the output end of the second operational amplifier comparator.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a multimode station comprising power control circuitry for any of the multimode stations described above.
The beneficial effect of this application is: be different from prior art's condition, the control loop of the power control circuit of the multimode radio station of this application sets up constant envelope control loop and non-constant envelope control loop, carries out power control to the constant envelope signal of multimode radio station and non-constant envelope signal respectively, makes the power control circuit of the multimode radio station of this application can satisfy the power control of constant envelope and non-constant envelope signal, and compare in prior art, the power control circuit's of the multimode radio station of this application adoption dual control loop can greatly reduced the degree of difficulty of the design algorithm of multimode radio station power control, thereby reduce the cost of multimode radio station power control.
Drawings
Fig. 1 is a schematic diagram of a conventional power control architecture for a multimode station;
FIG. 2 is a schematic diagram of a conventional single loop power control;
FIG. 3 is a schematic diagram of a first embodiment of a power control circuit for a multimode station according to the present invention;
fig. 4 is a schematic diagram of a second embodiment of a power control circuit for a multimode station according to the present application;
FIG. 5 is a schematic diagram of a portion of an embodiment of a non-constant envelope control loop of the present application;
FIG. 6 is a schematic diagram of an actual control circuit of an embodiment of the control loop of the present application;
FIG. 7 is a waveform schematic diagram of an embodiment of power control and modulation of predistortion of a radio frequency excitation signal according to the present application;
fig. 8 is a schematic structural diagram of an embodiment of a multimode station according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
IN order to solve the power control problem of the multi-mode station, the power control method of the multi-mode station IN the prior art is a software power control method, please refer to fig. 1, fig. 1 is a schematic structural diagram of the conventional power control of the multi-mode station, as shown IN fig. 1, a signal RF _ IN is input to an input end of a power amplifier 1, a signal output from the power amplifier 1 obtains a forward coupled signal through a directional coupler 2, the forward coupled signal is detected by a detector 3, an obtained voltage signal is converted into a Digital signal through an Analog-to-Digital Converter (ADC) 4, the Digital signal enters a Field Programmable Gate Array (FPGA) 5(Field Programmable Gate Array, FPGA) to be compared with a calibrated reference signal, the obtained control Digital signal enters a Digital-to-Analog Converter (DAC) 6, and the gain of the power amplifier 1 is controlled through an operational amplifier circuit 7, thereby achieving the closed-loop control of the power of the multimode radio station.
However, in the software power control mode in the prior art, frequency points and power of signals needing to be fitted are registered more, and the accuracy of signal detection can be met only by a higher sampling flow rate when the signals are not constant envelope signals, so that the design algorithm of the software power control mode is complex, the production is difficult, and the production cost is high.
Next, referring to fig. 2, fig. 2 is a schematic structural diagram of a conventional single-loop power control, as shown in fig. 2, an output end of a radio frequency excitation signal is connected to an input end of a power amplifier 10; the output end of the power amplifier 10 is connected with the input end of the directional coupler 20; the output end of the directional coupler 20 is connected to the antenna 40, the coupling end of the directional coupler 20 is connected to the input end of the mean value detector 311, the output end of the mean value detector 311 is connected to the first input end of the third operational amplifier comparator 70, the second input end of the third operational amplifier comparator 70 is input with the reference voltage APC, and the output end of the third operational amplifier comparator 70 is connected to the power amplifier. A resistor and a capacitor are connected between the first input terminal and the output terminal of the third operational amplifier comparator 70.
With the factors of the broadband, multimode, multi-trial, multi-waveform and the like of the multimode radio station, the power control complexity of the multimode radio station is increased, the distortion degree of the excitation radio frequency signal of the traditional single-ring power control of the multimode radio station is gradually increased, and the sending efficiency is gradually reduced.
In order to solve the problem of power control of a multimode station in the prior art, the present application first proposes a power control circuit of a multimode station, please refer to fig. 3, fig. 3 is a schematic structural diagram of a first embodiment of the power control circuit of the multimode station of the present application, and as shown in fig. 3, the power control circuit 100 of the multimode station of the present embodiment includes a power amplifier 10, a directional coupler 20, and a control loop 30; the power control circuit 100 performs power control on the radio frequency excitation signal of the multimode radio station, and transmits the radio frequency excitation signal after power control through the antenna 40; wherein, the output end of the radio frequency excitation signal is connected with the input end of the power amplifier 10; the output end of the power amplifier 10 is connected with the input end of the directional coupler 20; the output end of the directional coupler 20 is connected with the antenna 40, and the coupling end of the directional coupler 20 is connected with the input end of the control loop 30; the output of the control loop 30 is connected to the input of the power amplifier 10; the control loop 30 includes a constant envelope control loop 31 and a non-constant envelope control loop 32, where the constant envelope control loop 31 is used to perform power control on a constant envelope signal; the non-constant envelope control loop 32 is used to power control the non-constant envelope signal.
The power amplifier 10 is used for amplifying a radio frequency excitation signal input by the multimode radio station; the directional coupler 20 is a passive, port-reciprocal four-port device, one of which is isolated from the input port. In an ideal state, the four ports are completely matched, and the circuit has no loss. The directional coupler 20 has four ports, an input port, an output port, a coupling port, and an isolation port. On some commercial couplers, the isolation terminal is typically terminated internally or externally with a matched load, making the four-port device look like a three-port device. The directional coupler 20 can be implemented in various ways such as a microstrip line, a strip line, a coaxial line, a waveguide, etc., which are used to sample the input signal and the output signal. In the present embodiment, the directional coupler 20 is used for performing power detection on the rf excitation signal, obtaining a forward coupling voltage signal, and inputting the forward coupling voltage signal into the control loop 30.
The control loop 30 includes a constant envelope control loop 31 and a non-constant envelope control loop 32, where when the input radio frequency excitation signal is a constant envelope signal, the power control circuit 100 of the multimode radio station of this embodiment performs power control on the radio frequency excitation signal by using the constant envelope control loop, and when the input radio frequency excitation signal is a non-constant envelope signal, performs power control on the radio frequency excitation signal by using the non-constant envelope control loop.
Be different from prior art's condition, the control loop 30 of the power control circuit 100 of the multimode radio station of this application sets up constant envelope control loop 31 and non-constant envelope control loop 32, carry out power control to the constant envelope signal of multimode radio station and non-constant envelope signal respectively, make the power control circuit 100 of the multimode radio station of this application can satisfy the power control of constant envelope and non-constant envelope signal, and compare in prior art, the power control circuit 100's of the multimode radio station of this application adoption dual control loop can greatly reduced the degree of difficulty of the design algorithm of multimode radio station power control, thereby reduce the cost of multimode radio station power control.
Optionally, referring to fig. 4, fig. 4 is a schematic structural diagram of a power control circuit of a multimode station according to a second embodiment of the present application. As shown in fig. 4, the power control circuit 100 of the multimode station of the present embodiment further includes a switch 33, an input terminal of the switch 33 inputs a reference voltage APC; a first output of switch 33 is connected to an input of constant envelope control loop 31; a second output of the switch 33 is connected to an input of the non-constant envelope control loop 32.
A first output end of the switch 33 is connected with an input end of the constant envelope control loop 31 through a fourth resistor 331, one end of the fourth resistor 331 is connected with a first output end of the switch 33, and the other end of the fourth resistor 331 is connected with an input end of the constant envelope control loop 31; a second output terminal of the switch 33 is connected to the input terminal of the non-constant envelope control loop 32 through a fifth resistor 332, one end of the fifth resistor 332 is connected to the second output terminal of the switch 33, the other end of the fifth resistor 332 is connected to the input terminal of the non-constant envelope control loop 32, and the fourth resistor 331 and the fifth resistor 332 function to protect the switch 33.
The switch 33 can be selectively connected with the constant envelope control loop 31 and the non-constant envelope control loop 32 according to the mode of the multimode radio station, and when the multimode radio station is in the constant envelope mode, the input end of the switch 33 is connected with the first output end of the switch 33; when the multimode station is in the non-constant envelope mode, the output terminal of the switch 33 is connected to a second output terminal of the switch 33. The switch 33 may be a chip ADG884, and in other embodiments, the switch 33 may also have other circuit structures, which only need to satisfy the above functions, and is not limited herein.
Different from the prior art, the power control circuit 100 of the multimode radio station can meet the power control of constant envelope and non-constant envelope signals due to the arrangement of the switch 33, and the power control circuit 100 of the multimode radio station can select and connect the constant envelope control loop 31 and the non-constant envelope control loop 32 according to the constant envelope mode of the multimode radio station, so that the difficulty of a power control design algorithm is greatly reduced.
Optionally, referring to fig. 4, the non-constant envelope control loop 32 includes a peak detector 321 and a first operational amplifier comparator 322, wherein an input end of the peak detector 321 is connected to a coupling end of the directional coupler 20; a first input terminal of the first operational amplifier comparator 322 is connected to an output terminal of the peak detector 321, a second input terminal of the first operational amplifier comparator 322 inputs the non-constant envelope signal AM _ audio, a second input terminal of the first operational amplifier comparator 322 is connected to a second output terminal of the switch 33, and an output terminal of the first operational amplifier comparator 322 is connected to an input terminal of the power amplifier.
The non-constant envelope signal AM _ audio input to the second input terminal of the first operational amplifier comparator 322 may be provided with a sixth resistor 324, one end of the sixth resistor is connected to the second input terminal of the first operational amplifier comparator 322, and the other end of the sixth resistor 324 receives the non-constant envelope signal AM _ audio.
When the mode of the multimode radio station is the non-constant envelope mode, the input terminal of the switch 33 is connected to the second output terminal of the switch 33, at this time, the power control circuit 100 of the multimode radio station performs power control on a non-constant envelope signal, inputs the non-constant envelope signal AM _ audio and the reference voltage APC into the second input terminal of the first operational amplifier comparator 322 together for the non-constant envelope signal AM _ audio, the first input terminal of the first operational amplifier comparator 322 receives the voltage signal of the peak detector 321, the first operational amplifier comparator 322 performs integral comparison on the signals of the first input terminal and the second input terminal, and the obtained error signal controls the power amplifier 10, thereby realizing the power closed-loop control on the non-constant envelope signal. In this embodiment, the first input terminal of the first opamp comparator 322 is a positive input terminal, and the second input terminal is a negative input terminal, in other embodiments, the first input terminal of the first opamp comparator 322 may also be a negative input terminal, and the second input terminal may also be a positive input terminal, which is not limited herein. In this embodiment, the peak detector 321 may be an MA4E2200 chip, and in other embodiments, the peak detector 321 may also be other chips, which only needs to satisfy the function of the peak detector 321 in this embodiment, and is not limited herein.
Optionally, the non-constant envelope control loop 32 further includes a first capacitor 323, a first terminal of the first capacitor 323 is connected to a first input terminal of the first operational amplifier comparator 322, and a second terminal of the first capacitor 323 is connected to an output terminal of the first operational amplifier comparator 322. The first capacitor 323 is provided to maintain the stability of the circuit.
Optionally, referring to fig. 4 and 5, fig. 5 is a partial structural schematic diagram of an embodiment of the non-constant envelope control loop of the present application, where the non-constant envelope control loop 32 further includes a negative terminal of an adjustable attenuator diode, an input terminal of the negative terminal of the adjustable attenuator diode is connected to the coupling terminal of the directional coupler 20, and an output terminal of the negative terminal of the adjustable attenuator diode is connected to an input terminal of the peak detector 321.
In this embodiment, the negative end of the adjustable attenuator diode is disposed between the directional coupler 20 and the peak detector 321, so as to improve the detection dynamic range of the peak detector 321.
Optionally, as shown in fig. 4, the peak detector 321 includes a second capacitor 3211, a first resistor 3212, a first diode 3213, a second diode 3214, a second resistor 3215, and a third capacitor 3216, where a first end of the second capacitor 3211 is connected to the output end of the negative end of the adjustable attenuator diode; a first end of the first resistor 3212 is connected to a second end of the second capacitor 3211; a forward terminal of the first diode 3213 is connected to a second terminal of the first resistor and grounded; a negative end of the first diode 3213 is connected to a second end of the second capacitor 3211; a positive end of a second diode 3214 is connected to the second end of the second capacitor 3211 and the negative end of the first diode, respectively; a first end of the second resistor 3215 is connected to a negative end of a second diode 3214; the second resistor 3215 is connected to the first input terminal of the first operational amplifier comparator 322; a first end of the third capacitor 3216 is grounded, and a second end of the third capacitor 3216 is connected to a second end of the second resistor 3215.
Specifically, the first diode 3213 and the second diode 3214 include schottky diodes, and in the present embodiment, the first diode 3213 and the second diode 3214 are silicon zero-biased p-type schottky diodes.
With the increase of the modulation degree of the modulation of the radio frequency excitation signal, the current requirement on the threshold voltage of the detector is more and more, so in order to detect the radio frequency excitation signal of a non-constant envelope type, the novel peak detector 321 is provided in the present application, and because the schottky diode has the advantages of high switching frequency and low forward voltage drop, the forward conduction voltages of the first diode 3213 and the second diode 3214 of the peak detector 321 are extremely low, and the detection with the input amplitude of-3 to +10dBm, the modulation degree of more than 95% and the distortion of less than 0.5% can be satisfied.
Optionally, referring to fig. 4, as shown in fig. 4, the constant envelope control loop 31 includes a mean detector 311 and a second operational amplifier comparator 312, an input terminal of the mean detector 311 is connected to a coupling terminal of the directional coupler 20; a first input terminal of the second operational amplifier comparator 312 is connected to the output terminal of the mean value detector 311, a second input terminal of the second operational amplifier comparator 312 is connected to the first output terminal of the switch 33, and an output terminal of the second operational amplifier comparator 312 is connected to the input terminal of the power amplifier 10.
When the mode of the multimode radio station is a constant envelope mode, the input end of the switch 33 is connected with the first output end of the switch 33, at this time, the power control circuit 100 of the multimode radio station performs power control on a constant envelope signal, a forward coupling voltage signal acquired by the directional coupler 20 is input into the average detector 311, the average detector 311 is connected with the first input end of the second operational amplifier comparator 312, the reference voltage APC is input into the second input end of the second operational amplifier comparator 312 through the first output end of the switch, the second operational amplifier comparator 312 performs integral comparison on signals of the first input end and the second input end, and an obtained error signal controls the power amplifier 10, so that power closed-loop control on the constant envelope signal is realized. In this embodiment, the average detector 311 may adopt an LT5581 chip, and in other embodiments, the average detector 311 may also be another chip, and only the function of the average detector 311 in this embodiment needs to be satisfied, which is not limited herein.
Optionally, referring to fig. 3, the constant envelope control loop 31 of the present embodiment further includes a fourth capacitor 313 and a third resistor 314, wherein a first end of the fourth capacitor 313 is connected to a first input end of the second operational amplifier comparator 312; a first terminal of the third resistor 314 is connected to a second terminal of the fourth capacitor 313, and the third resistor 314 is connected to an output terminal of the second opamp comparator 312.
The fourth capacitor and the third resistor 314 are also provided to maintain the stability of the circuit.
The power control circuit 100 of the multi-mode radio station adopts a double loop point power control mode, detects a constant envelope signal by using a mean detector 311, performs fast integral comparison on a reference voltage APC and a voltage signal detected by the mean value, and controls the power amplifier 10 by using the difference value of the reference voltage APC and the voltage signal, thereby realizing closed-loop power control; aiming at the non-constant envelope signal, a novel peak detector 321 is adopted for detecting, envelope following predistortion of the non-constant envelope signal can be met when closed-loop power control is carried out, efficiency and distortion degree of the non-constant envelope signal can be effectively improved under the same saturation power, and frequency hopping power control of the non-constant envelope signal can be met when the peak detector 321 is high in linearity.
In an application scenario, please refer to fig. 6, fig. 6 is a schematic diagram of an actual control circuit according to an embodiment of the control loop of the present application.
As shown in fig. 6, the input end of the control loop is connected to the peak detector and the average detector, the peak detector is connected to the non-constant envelope loop, the average detector is connected to the constant envelope control loop, and the switch is connected to the non-constant envelope loop and the constant envelope loop for switching the non-constant envelope loop control and the constant envelope loop control based on the mode of the multimode station.
In the peak detector, a MA4E2200 silicon zero-bias p-type Schottky diode and an RC are adopted to form detection. The attenuator IDTF2255 chip is used for expanding the detection dynamic range of the peak detector, the input end of the control loop is connected with the ends of capacitors C14, R12, R10 and C4 in turn to the end RF2 of the IDTF2255 chip, the ends GND1, GND2, GND3, GND4, NC1, NC2, NC3, NC4 and NC5 of the MA4E2200 chip are connected to ground, the end RTN1 of the IDTF2255 chip is connected to the end C9 and then to ground, the end RTN2 of the MA4E2200 chip is connected to the end C10 and then to ground, the end RTN3 of the IDTF2255 chip is connected to the end C11 and then to ground, the end VMODE and the end VDD of the IDTF2255 chip are connected to a power supply with voltage of 3V and current of 3A and are connected to ground through a capacitor C2, and the end TRVCL of the IDTF2255 chip is connected to the attenuator.
The RF1 end of the IDTF2255 chip is connected to one end of a capacitor C3, the other end of a capacitor C3 is connected to a resistor R8 and grounded, the other end of the capacitor C3 is connected to the 3 end of a MA4E2200 silicon zero-bias p-type Schottky diode D1, the 1 end of the silicon zero-bias p-type Schottky diode D1 is grounded, the 2 end of the MA4E2200 silicon zero-bias p-type Schottky diode D1 is connected to the resistor R6 and grounded, and the 2 end of the silicon zero-bias p-type Schottky diode D1 is connected to the capacitor C7 and grounded.
An input end 2 of the silicon zero-bias p-type Schottky diode D1 is connected with a resistor R4 and an operational amplifier comparator U2A in non-constant envelope loop control, an input end 3 of the operational amplifier comparator U2A is connected with one end of the resistor R5, the other end of the resistor R5 is connected with a capacitor C6 and grounded, the other end of the resistor R5 receives a non-constant envelope signal AM _ mod, an input end 3 of the operational amplifier comparator U2A is connected with a resistor R9 and grounded, and an input end 3 of the operational amplifier comparator U2A is connected with a capacitor C8 and grounded and connected with a switch through the resistor R7. The 4 ends of the operational amplifier comparator U2A are grounded, the 8 ends of the operational amplifier comparator U2A are connected with a power supply with the voltage of 5V, the 1 end of the output end of the operational amplifier comparator U2A is connected with one end of a resistor R3, the other end of the resistor R3 is grounded with a capacitor C5, and the other end of the resistor R3 is connected with a switch. A capacitor C1 is connected between the output end 1 end and the input end 2 end of the operational amplifier comparator U2A, and a resistor R1 is connected with the capacitor C1 in parallel.
The switch adopts an ADG884 chip, the NC1 end of the ADG884 chip is connected with the other end of the resistor R3, and the NC2 end of the ADG884 chip is connected with the other end of the resistor R7.
The control signal APC _ SW is connected to the IN2 terminal of the ADG884 chip through a resistor R11, and the IN2 terminal of the ADG884 chip is connected to the capacitor C13 and grounded; the control signal SW is also input to the IN2 end of the ADG884 chip, the reference voltage APC is input to the COM2 end of the ADG884 chip, the resistor R13 is connected to the COM1 end of the ADG884 chip to serve as the output end of the control loop, the constant envelope loop control is connected to the NO1 end and the NO2 end of the switch, the VCC end of the switch is connected to the capacitor C12 and grounded, and is connected to the power supply with the voltage of 5V, and the GND end of the switch is grounded.
The control signals APC _ SW and SW are generated based on the mode of a multimode radio station, and when the multimode radio station is in a non-constant envelope mode, the ADG884 chip controls the reference voltage APC to be accessed into the non-constant envelope loop control; when the multimode radio station is in a constant envelope mode, the ADG884 chip controls the reference voltage APC to be connected to the constant envelope loop control.
The average detector adopts an LT5581 chip, the input end of a control loop is sequentially connected with a capacitor C14, a resistor R12 and a resistor R14 and is connected with one end of a capacitor C22 in the average detector, the other end of the capacitor C22 is connected with a resistor R24 and is grounded, the other end of a capacitor C22 is connected with one end of a resistor R18, the other end of the resistor R18 is connected with a resistor R23 and is grounded, the other end of the resistor R18 is connected with one end of a capacitor C21, the other end of the capacitor C21 is respectively connected with one end of an inductor L1 and a capacitor C24, the capacitor C24 is grounded, the other end of the inductor L1 is connected with a capacitor C20 and is connected with the RFin end of the LT5581 chip, and the other end of the inductor L1 is connected with a resistor R22 and is grounded.
The GND, GND2, GND3 and GND4 ends of the LT5581 chip are grounded, the CSQ end of the LT5581 chip is connected with the capacitor C15 and grounded, the Vcc end and the EN end of the LT5581 chip are connected with a power supply with the voltage of 3V, and are respectively connected with the capacitor C18 and the capacitor C19 and grounded, the Vout end of the LT5581 chip is connected with the capacitor C26 and grounded, the Vout end of the LT5581 chip is connected with one end of the resistor R21, the other end of the resistor R21 is respectively connected with the resistor R20 and the capacitor C25, and the capacitor C25 is grounded. The LT5581 chip is configured to receive the constant envelope signal and output a voltage signal proportional to the constant envelope signal on a linear scale.
In constant envelope loop control, the input end 6 of the operational amplifier comparator U2B is connected with a resistor R20, the input end 5 of the operational amplifier comparator U2B is connected with the resistor R17 and grounded, the input end 5 of the operational amplifier comparator U2B is connected with a capacitor C16 and grounded, the input end 5 of the operational amplifier comparator U2B is connected with a resistor R15 and then connected to the NO2 end of a switch, the output end 7 of the operational amplifier comparator U2B is connected with one end of the resistor R16, the other end of the resistor R16 is connected with the capacitor C17, the capacitor C17 is grounded, and the other end of the resistor R16 is connected with the NO1 end of the switch. The input end 6 end and the output end 7 end of the operational amplifier comparator U2B are connected through a resistor R19 and a capacitor C23, and the resistor R25 is connected in parallel with a resistor R19 and a capacitor C23.
Referring to fig. 7, fig. 7 is a waveform diagram illustrating an embodiment of power control and modulation for predistortion of an rf excitation signal according to the present application. The circuit of figure 6 was tested in practice and the power control and modulation of the predistortion of the rf excitation signal is shown in figure 7.
The following table shows the distortion factor and the transmission efficiency of the traditional single-ring power control and the scheme of the application under different frequency points:
as can be seen from the above table, compared with the conventional single-loop power control, the modulation of the scheme of the present application reduces the distortion degree at different frequency points, optimizes the distortion degree of the radio frequency excitation signal to about 2%, and achieves a higher level.
Secondly, after the scheme of the application is adopted, the transmission efficiency under different frequency points is improved; the efficiency is integrally improved by about 24 percent.
The following table shows the frequency conversion time and power overshoot of different frequency points under the condition of constant envelope signals when the traditional single-loop power control and the scheme of the application are applied to a PR9530 radio station:
from the above table, the power overshoot and frequency conversion time differences of the traditional single-loop power control and the scheme of the application are not large, and the requirements of indexes can be met.
Different from the prior art, the control loop of the power control circuit 100 of the multimode radio station of the present application is provided with a constant envelope control loop 31 and a non-constant envelope control loop 32, and power control is performed on a constant envelope signal and a non-constant envelope signal of the multimode radio station respectively, so that the power control circuit of the multimode radio station of the present application can satisfy power control of the constant envelope signal and the non-constant envelope signal, and compared with the prior art, the difficulty of the design algorithm of power control of the multimode radio station can be greatly reduced by adopting the double control loops of the power control circuit 100 of the multimode radio station of the present application, thereby reducing the cost of power control of the multimode radio station.
Furthermore, a double-loop power control mode is adopted, and the mean detector 311 is adopted for fast detection aiming at constant envelope signals, so that closed-loop power control is realized; aiming at the non-constant envelope signal, the closed-loop power control is realized by adopting the rapid detection of the peak detector 321, so that the power control circuit of the multimode radio station can meet the power control of the constant envelope signal and the non-constant envelope signal and simultaneously reduce the difficulty of the design algorithm of the power control of the multimode radio station.
The novel peak detector 321 is adopted, so that the transmission efficiency of the radio frequency excitation signal can be effectively improved and the distortion degree can be reduced under the same saturation power.
In summary, the power control circuit 100 of the multi-mode radio station of the present application can greatly reduce the difficulty of power control design of the multi-mode radio station; the transmitting efficiency of the radio frequency excitation signal is improved, the distortion degree is reduced, and the power control cost of the multi-mode radio station is lowered; and frequency hopping power control can be implemented.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a multimode station 200 according to an embodiment of the present invention, which includes the power control circuit 100 of any one of the multimode stations.
The multimode radio station 200 of the present embodiment may be an open field radio station, a 1.5 generation radio station, a 2 generation radio station, an individual soldier integrated terminal, and the like of a domestic tactical radio station, which is not limited herein.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (10)
1. A power control circuit of a multimode radio station is characterized in that the power control circuit comprises a power amplifier, a directional coupler and a control loop;
the power control circuit controls the power of the radio frequency excitation signal of the multimode radio station and transmits the radio frequency excitation signal after the power control through an antenna;
the output end of the radio frequency excitation signal is connected with the input end of the power amplifier;
the output end of the power amplifier is connected with the input end of the directional coupler;
the output end of the directional coupler is connected with the antenna, and the coupling end of the directional coupler is connected with the input end of the control loop;
the output end of the control loop is connected with the input end of the power amplifier;
the control loop comprises a constant envelope control loop and a non-constant envelope control loop, and the constant envelope control loop is used for carrying out power control on a constant envelope signal; the non-constant envelope control loop is used for carrying out power control on a non-constant envelope signal.
2. The power control circuit of claim 1, wherein said control loop further comprises a switch, an input of said switch inputting a reference voltage; a first output end of the switch is connected with an input end of the constant envelope control loop; and the second output end of the switch is connected with the input end of the non-constant envelope control loop.
3. The power control circuit of claim 2, wherein the non-constant envelope control loop comprises:
the input end of the peak detector is connected with the coupling end of the directional coupler;
the comparator is put to first fortune, the first input of comparator is put to first fortune with the output of peak detector is connected, the second input of comparator is put to first fortune is imported the non-constant envelope signal, just the second input of comparator is put to first fortune with the second output of switch is connected, the output of comparator is put to first fortune with power amplifier's input is connected.
4. The power control circuit of claim 3, wherein the non-constant envelope control loop further comprises:
and the first end of the first capacitor is connected with the first input end of the first operational amplifier comparator, and the second end of the first capacitor is connected with the output end of the first operational amplifier comparator.
5. The power control circuit of claim 3, wherein said non-constant envelope control loop further comprises an adjustable attenuator, an input of said adjustable attenuator is coupled to said coupling of said directional coupler, and an output of said adjustable attenuator is coupled to an input of said peak detector.
6. The power control circuit of claim 5, wherein said peak detector comprises:
a first end of the second capacitor is connected with the output end of the adjustable attenuator;
a first end of the first resistor is connected with a second end of the second capacitor;
a first diode, a forward end of which is connected with the second end of the first resistor and grounded; the negative end of the first diode is connected with the second end of the second capacitor;
a positive end of the second diode is connected with a second end of the second capacitor and a negative end of the first diode respectively;
a second resistor, a first end of the second resistor being connected to a negative terminal of the second diode; the second resistor is connected with a first input end of the first operational amplifier comparator;
and a first end of the third capacitor is grounded, and a second end of the third capacitor is connected with a second end of the second resistor.
7. The power control circuit of claim 6, wherein said first diode and said second diode comprise schottky diodes.
8. The power control circuit of claim 2, wherein the constant envelope control loop comprises:
the input end of the mean detector is connected with the coupling end of the directional coupler;
and a second operational amplifier comparator, wherein a first input end of the second operational amplifier comparator is connected with an output end of the mean value detector, a second input end of the second operational amplifier comparator is connected with a first output end of the switch, and an output end of the second operational amplifier comparator is connected with an input end of the power amplifier.
9. The power control circuit of claim 8, wherein the constant envelope control loop further comprises:
a first end of the fourth capacitor is connected with a first input end of the second operational amplifier comparator;
and the first end of the third resistor is connected with the second end of the fourth capacitor, and the third resistor is connected with the output end of the second operational amplifier comparator.
10. A multimode station, characterized in that it comprises a power control circuit of a multimode station according to any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210651755.2A CN115061524A (en) | 2022-06-07 | 2022-06-07 | Power control circuit of multimode radio station and multimode radio station |
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| CN202210651755.2A CN115061524A (en) | 2022-06-07 | 2022-06-07 | Power control circuit of multimode radio station and multimode radio station |
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| CN202210651755.2A Pending CN115061524A (en) | 2022-06-07 | 2022-06-07 | Power control circuit of multimode radio station and multimode radio station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116846411A (en) * | 2023-09-04 | 2023-10-03 | 成都市凌巨通科技有限公司 | Automatic power control system for frequency hopping and pulse signals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116846411A (en) * | 2023-09-04 | 2023-10-03 | 成都市凌巨通科技有限公司 | Automatic power control system for frequency hopping and pulse signals |
| CN116846411B (en) * | 2023-09-04 | 2023-11-24 | 成都市凌巨通科技有限公司 | Automatic power control system for frequency hopping and pulse signals |
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Address after: 1802, Block A, Building 6, Shenzhen International Holdings International Innovation Valley, Dashi 1st Road, Xili Community, Xili Street, Nanshan District, Shenzhen, Guangdong 518000 Applicant after: Haides Communication Co.,Ltd. Address before: 518000 Room 601, Haoyitong building, 9108 North Ring Avenue, songpingshan community, Xili street, Nanshan District, Shenzhen, Guangdong Applicant before: Shenzhen Tianhai Communication Co.,Ltd. |