CN210201792U - Analog predistortion power amplifying device and micro base station - Google Patents
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Abstract
The application relates to an analog predistortion power amplification device and a micro base station, which comprise a radio frequency integration module, an analog predistortion module, a first amplification module, a gating module, a filtering module and an antenna module; the radio frequency integrated module sends an initial radio frequency sending signal, the analog predistortion module couples and phase adjusts the initial radio frequency sending signal to generate a predistortion radio frequency signal, the first amplification module amplifies the predistortion radio frequency signal to generate a first radio frequency signal, the gating module enables the first radio frequency signal to be transmitted unidirectionally according to a first path, the filtering module performs band-pass filtering on the first radio frequency signal to generate a target output radio frequency signal, the antenna module generates the first wireless signal according to the target output radio frequency signal, the analog predistortion module circuit with the advantages of simple structure, small size and high efficiency is applied to a micro base station, the requirement of linearization of the radio frequency sending signal can be effectively met, and the cost, the size and the weight of the micro base station are effectively reduced.
Description
Technical Field
The application belongs to the technical field of wireless communication, and particularly relates to an analog predistortion power amplifying device and a micro base station.
Background
At present, due to the weak points that 5G millimeter waves have poor penetrating power and are greatly attenuated in air, if a 'macro base station' used in 3G and 4G periods in the past is still adopted for 5G, sufficient signal guarantee cannot be provided for users far away. Therefore, with the development of 5G wireless communication technology, base stations with low power need to be densely deployed in indoor and outdoor hot spot areas, and thus the market demand for micro base stations is on a trend of doubling, and the requirements for performance, price and volume of the micro base stations are increasingly strict.
Generally, a baseband digital predistortion technology is adopted in a common micro base station, the output of a power amplifier is coupled with a part of energy through a coupler to enter a detection pin of an RFIC (radio frequency integrated circuit), the power amplifier is detected and analyzed, a distortion parameter of the power amplifier is obtained in a self-adaptive manner, then, signal calibration is carried out at an input port of the power amplifier, and the requirement of linearization on the power amplifier is met. Because the output power of the micro base station is not high, the feedback and calibration are carried out through the baseband digital predistortion technology, so that the cost is wasted by over-design of linearization indexes, the complexity of hardware and software is increased, the circuit structure and the realization are complex, the base station has large volume and heavy weight, and the price is very high.
Therefore, the problems of complex structure, low efficiency, large size, heavy weight and high cost of the baseband digital predistortion circuit of the micro base station exist in the traditional technical scheme.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides an analog predistortion power amplifying device and a micro base station, and aims to solve the problems of complex structure, low efficiency, large size, heavy weight and high cost of a micro base station baseband digital predistortion circuit in the conventional technical solution.
A first aspect of an embodiment of the present application provides an analog predistortion power amplifying apparatus, including:
the radio frequency integrated module is used for transmitting an initial radio frequency transmission signal;
the analog predistortion module is connected with the radio frequency integrated module and used for coupling and phase adjusting the initial radio frequency transmission signal to generate a predistortion radio frequency signal;
the first amplification module is connected with the analog predistortion module and used for amplifying the predistortion radio frequency signal to generate a first radio frequency signal;
the gating module is connected with the first amplifying module and is used for enabling the first radio-frequency signal to be transmitted in a single direction according to a first path;
a filtering module connected to the gating module for performing band-pass filtering on the first rf signal to generate a target output rf signal;
and the antenna module is connected with the filtering module and used for generating a first wireless signal according to the target output radio frequency signal.
In one embodiment, the analog predistortion power amplifying device further comprises:
the switch module is connected with the gating module and used for isolating the first radio frequency signal according to user input and communicating a second radio frequency signal according to the user input;
the second amplifying module is connected with the switch module and used for amplifying the second radio frequency signal to generate a target input radio frequency signal;
the radio frequency integrated module is also used for receiving the target input radio frequency signal; the antenna module is also used for generating an initial radio frequency receiving signal according to the second wireless signal; the filtering module is further configured to perform a band-pass filtering on the initial radio frequency receive signal to generate the second radio frequency signal; the gating module is also used for enabling the second radio frequency signal to be transmitted unidirectionally according to the second path.
In one embodiment, the gating module comprises a circulator.
In one embodiment, the switch module comprises an alternative switch.
In one embodiment, the analog predistortion module comprises:
the directional coupling unit is used for receiving the initial radio frequency transmission signal and generating a predistortion radio frequency signal according to a second predistortion radio frequency signal;
the predistortion unit is connected with the directional coupling unit and used for generating a first predistortion radio frequency signal according to the initial radio frequency transmission signal;
and the adjusting unit is connected with the directional coupling unit and used for adjusting the linear component and the reactance in the first pre-distorted radio frequency signal to generate the second pre-distorted radio frequency signal.
In one embodiment, the predistortion unit comprises a first diode and a second diode;
the cathode of the first diode is connected with the anode of the second diode, and the anode of the first diode and the cathode of the second diode are connected with a power ground;
the cathode of the first diode and the anode of the second diode are jointly formed into an initial radio frequency transmission signal input end of the predistortion unit and a first predistortion radio frequency signal output end of the predistortion unit.
In one embodiment, the adjusting unit comprises a first resistor and a first capacitor;
a first end of the first resistor is connected with a first end of the first capacitor, and a second end of the first resistor and a second end of the first capacitor are connected with a power ground;
the first end of the first resistor and the first end of the first capacitor are jointly formed into a first pre-distorted radio frequency signal input end of the adjusting unit and a second pre-distorted radio frequency signal output end of the adjusting unit.
In one embodiment, the directional coupling unit comprises a first directional coupler;
the input end of the first directional coupler is the initial radio frequency transmission signal input end of the directional coupling unit;
the isolation ends of the first directional coupler are an initial radio frequency transmission signal output end of the directional coupling unit and a first predistortion radio frequency signal input end of the directional coupling unit;
the coupling ends of the first directional coupler are a first pre-distortion radio frequency signal output end of the directional coupling unit and a second pre-distortion radio frequency signal input end of the directional coupling unit;
and the through end of the first directional coupler is a predistortion radio frequency signal output end of the directional coupling unit.
A second aspect of the embodiments of the present application provides a micro base station, which includes the analog predistortion power amplifying device as described above.
According to the embodiment of the application, the initial radio frequency transmitting signal is transmitted through the radio frequency integrated module, the initial radio frequency transmitting signal is coupled and phase-adjusted through the analog predistortion module to generate the predistortion radio frequency signal, the predistortion radio frequency signal is amplified through the first amplification module to generate the first radio frequency signal, the first radio frequency signal is transmitted in a single direction through the gating module according to the first path, the first radio frequency signal is subjected to the band-pass filtering through the filtering module to generate the target output radio frequency signal, the antenna module generates the first radio signal according to the target output radio frequency signal, the application of the analog predistortion circuit in the micro base station is achieved through the simple-structure small-size high-efficiency analog predistortion circuit, the requirement of linearization of the radio frequency transmitting signal can be effectively met, and the cost, the size and the weight of the micro base station are effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an analog predistortion power amplifying device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an analog predistortion power amplifying device according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an analog predistortion module according to an embodiment of the present application;
fig. 4 is an exemplary circuit schematic diagram of an analog predistortion module provided by an embodiment of the present application;
fig. 5 is a schematic diagram of an exemplary circuit of an analog predistortion module and a first amplification module according to an embodiment of the present application.
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.
Referring to fig. 1, a schematic structural diagram of an analog predistortion power amplifying device according to an embodiment of the present application shows only parts related to the embodiment for convenience of description, and the details are as follows:
an analog predistortion power amplifying device comprises a radio frequency integrated module 10, an analog predistortion module 11, a first amplifying module 12, a gating module 13, a filtering module 14 and an antenna module 15.
The radio frequency integrated module 10 is used for transmitting an initial radio frequency transmission signal; the analog predistortion module 11 is connected with the radio frequency integrated module 10 and is used for coupling and phase adjusting the initial radio frequency transmission signal to generate a predistortion radio frequency signal; the first amplifying module 12 is connected to the analog predistortion module 11, and is configured to amplify the predistortion radio frequency signal to generate a first radio frequency signal; the gating module 13 is connected to the first amplifying module 12, and configured to enable the first radio frequency signal to be transmitted in a single direction according to the first path; the filtering module 14 is connected to the gating module 13, and configured to perform band-pass filtering on the first radio frequency signal to generate a target output radio frequency signal; the antenna module 15 is connected to the filtering module 14, and is configured to generate a first wireless signal according to the target output radio frequency signal.
In specific implementation, when the radio frequency integrated module 10 sends a radio frequency signal, the analog predistortion module 11 generates a predistortion radio frequency signal according to an initial radio frequency sending signal, the amplification module 12 amplifies the predistortion radio frequency signal to generate a first radio frequency signal, the first radio frequency signal is respectively isolated and filtered by the gating module 13 and the filtering module 14, and then is generated into a wireless signal by the antenna module 15 to be emitted.
Referring to fig. 2, in one embodiment, the analog predistortion power amplifying device further includes a switch module 16 and a second amplifying module 17.
The switch module 16 is connected with the gating module 13 and used for isolating the first radio frequency signal according to user input and communicating the second radio frequency signal according to the user input; the second amplifying module 17 is connected to the switch module 16, and is configured to amplify the second radio frequency signal to generate a target input radio frequency signal; the rf integrated module 10 is further configured to receive a target input rf signal; the antenna module 15 is further configured to generate an initial radio frequency receiving signal according to the second wireless signal; the filtering module 14 is further configured to perform a band-pass filtering on the initial rf received signal to generate a second rf signal; the gating module 13 is further configured to enable the second rf signal to transmit unidirectionally according to the second path.
In a specific implementation, the gating module 13 may optionally include a circulator. The circulator can limit the first radio frequency signal and the second radio frequency signal to be transmitted only along unidirectional loops in different directions, so that the transmitted first radio frequency signal and the received second radio frequency signal are separated, the reverse transmission of the first radio frequency signal is prevented, and the first radio frequency signal and the second radio frequency signal are prevented from generating mutual interference to influence the transmission efficiency and precision of the radio frequency signals.
In one embodiment, the switch module 16 includes an alternative switch.
In specific implementation, the first radio frequency signal and the second radio frequency signal can be further isolated by arranging the alternative switch on the receiving loop, and the precision of the device for receiving the radio frequency signals and transmitting the radio frequency signals is improved. For example, when the radio frequency signal is transmitted, the two-out switch may be turned to the first gating end, and the connection between the second amplification module 17 and the gating module 13 is disconnected, so as to prevent a part of the first radio frequency signal from being output to the second amplification module 17 after passing through the gating module 13 and interfering with the reception of the radio frequency signal; when receiving the radio frequency signal, the alternative switch may be tuned to the second gating terminal, so as to prevent the second radio frequency signal from being transmitted to the first amplifying module after passing through the gating module 13, thereby affecting the transmission of the radio frequency signal.
Referring to fig. 3, in one embodiment, the analog predistortion module 11 includes a directional coupling unit 111, a predistortion unit 112 and an adjustment unit 113.
The directional coupling unit 111 is configured to receive the initial radio frequency transmission signal and generate a predistortion radio frequency signal according to the second predistortion radio frequency signal; the predistortion unit 112 is connected to the directional coupling unit 111, and configured to generate a first predistortion radio frequency signal according to the initial radio frequency transmission signal; the adjusting unit 113 is connected to the directional coupling unit 111 for adjusting the linear component and the reactance in the first pre-distorted radio frequency signal to generate a second pre-distorted radio frequency signal.
Referring to fig. 4, in one embodiment, the predistortion unit 112 includes a first diode D1 and a second diode D2.
The cathode of the first diode D1 is connected to the anode of the second diode D2, and the anode of the first diode D1 and the cathode of the second diode D2 are connected to the power ground.
The cathode of the first diode D1 and the anode of the second diode D2 are jointly configured as an initial rf transmit signal input of the predistortion unit 112 and a first predistorted rf signal output of the predistortion unit 112.
Referring to fig. 4, in one embodiment, the adjusting unit 113 includes a first resistor R1 and a first capacitor C1.
A first terminal of the first resistor R1 is connected to a first terminal of the first capacitor C1, and a second terminal of the first resistor R1 and a second terminal of the first capacitor C1 are connected to ground.
The first terminal of the first resistor R1 and the first terminal of the first capacitor C1 are commonly configured as a first pre-distorted rf signal input terminal of the adjusting unit 113 and a second pre-distorted rf signal output terminal of the adjusting unit 113.
Referring to fig. 4, in one embodiment, the directional coupling unit 111 includes a first directional coupler U1.
The input end of the first directional coupler U1 is the initial radio frequency transmission signal input end of the directional coupling unit 111; the isolation end of the first directional coupler U1 is the initial rf transmit signal output end of the directional coupling unit 111 and the first predistortion rf signal input end of the directional coupling unit 111; the coupling ends of the first directional coupler U1 are a first pre-distorted radio frequency signal output end of the directional coupling unit 111 and a second pre-distorted radio frequency signal input end of the directional coupling unit 111; the through terminal of the first directional coupler U1 is the predistortion rf signal output terminal of the directional coupling unit 111.
In a specific implementation, the first directional coupler U1 is optionally a two-branch directional coupler. Since the diode is a nonlinear semiconductor device, corresponding to an input signal, such as a cosine signal, the output of the diode is the cosine signal containing nonlinear distortion components, and by utilizing this characteristic of the diode, the first predistortion rf signal can be generated by two antiparallel diodes (the first diode D1 and the second diode D2) included in the predistortion unit 112. The resistance of the coupling end of the ideal 3dB first directional coupler U1 (the first resistor R1) may be used to cancel the residual linear component in the reflected output signal of the diode pair (the first diode D1 and the second diode D2), and the first capacitor C1 may compensate the reactance of the diode pair, so that the isolation end of the first directional coupler U1 theoretically will only have the remaining nonlinear components of the third order intermodulation component (IM3) and the fifth order intermodulation component (IM 5).
In an implementation, referring to fig. 5, for the power amplifier PA, the input-output relationship can be expressed by a polynomial:
y＝α1x+α2x2+α3x3(1)
where x is the input signal and y is the output signal α1、α2、α3For the nonlinear distortion coefficients of the amplifier, if the predistortion signal z is applied at the input of the power amplifier PA, then equation (1) can be written as:
y＝α1(x+z)+α2(x+z)2+α3(x+z)3(2)
in a predistortion system, the predistortion signal z is much smaller than the input signal x, so an approximation is possibleThe predistortion signal z in the quadratic and cubic terms is omitted. Let x be cos ω1t+cosω2t，z＝b[cos(2ω1-ω2)t+cos(2ω2-ω1)t]Wherein, ω is1And ω2All angular frequencies, t is time, and can be calculated according to formula (1) and formula (2), when b is-3 α1/4α2At this time, the third order intermodulation products in the output signal will cancel completely. Similarly, the fifth-order intermodulation signal in the output signal can be completely cancelled by properly adjusting b. In this way, it is theoretically proven that the circuit of the analog predistortion module can linearize the input and output of the power amplifier PA.
In specific implementation, the size of the analog predistortion adjustment can be changed by adjusting parameters of the first resistor R1 and the first capacitor C1 at the coupling end of the first directional coupler U1, so as to adapt to the influence of power amplifier distortion parameters of different power amplifiers on the transmitted radio frequency signal.
The implementation of the application shows that the third-order intermodulation component and the fifth-order intermodulation component of the power amplifier can be mutually offset by reasonably adjusting b through theoretical calculation and analysis of the input-output relationship of the analog predistortion power amplifier with the circuit structure, so that the requirement of the output linearity of the power amplifier is met.
A second aspect of the embodiments of the present application provides a micro base station, which includes the analog predistortion power amplifying device as described above.
The embodiment of the application can effectively eliminate the third-order intermodulation component and the fifth-order intermodulation component in the power amplifier by simulating the predistortion power amplifying device, meets the requirement of the output linearity of the power amplifier in the microwave transmitting process, has simple circuit structure, is easy to realize and high in efficiency, and effectively reduces the cost, the volume and the weight of the micro base station.
It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments. Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (9)
1. An analog predistortion power amplifying device, comprising:
the radio frequency integrated module is used for transmitting an initial radio frequency transmission signal;
the analog predistortion module is connected with the radio frequency integrated module and used for coupling and phase adjusting the initial radio frequency transmission signal to generate a predistortion radio frequency signal;
the first amplification module is connected with the analog predistortion module and used for amplifying the predistortion radio frequency signal to generate a first radio frequency signal;
the gating module is connected with the first amplifying module and is used for enabling the first radio-frequency signal to be transmitted in a single direction according to a first path;
a filtering module connected to the gating module for performing band-pass filtering on the first rf signal to generate a target output rf signal;
and the antenna module is connected with the filtering module and used for generating a first wireless signal according to the target output radio frequency signal.
2. The analog predistortion power amplification device as set out in claim 1, wherein said analog predistortion power amplification device further comprises:
the switch module is connected with the gating module and used for isolating the first radio frequency signal according to user input and communicating a second radio frequency signal according to the user input;
the second amplifying module is connected with the switch module and used for amplifying the second radio frequency signal to generate a target input radio frequency signal;
the radio frequency integrated module is also used for receiving the target input radio frequency signal; the antenna module is also used for generating an initial radio frequency receiving signal according to the second wireless signal; the filtering module is further configured to perform a band-pass filtering on the initial radio frequency receive signal to generate the second radio frequency signal; the gating module is also used for enabling the second radio frequency signal to be transmitted unidirectionally according to the second path.
3. The analog predistortion power amplifying device as set out in claim 1 or 2, wherein said gating module comprises a circulator.
4. The analog predistortion power amplifying device as set out in claim 2, wherein said switching module comprises an alternative switch.
5. The analog predistortion power amplification device of claim 1, wherein the analog predistortion module comprises:
the directional coupling unit is used for receiving the initial radio frequency transmission signal and generating a predistortion radio frequency signal according to a second predistortion radio frequency signal;
the predistortion unit is connected with the directional coupling unit and used for generating a first predistortion radio frequency signal according to the initial radio frequency transmission signal;
and the adjusting unit is connected with the directional coupling unit and used for adjusting the linear component and the reactance in the first pre-distorted radio frequency signal to generate the second pre-distorted radio frequency signal.
6. The analog predistortion power amplifying device as set out in claim 5, wherein said predistortion unit comprises a first diode and a second diode;
the cathode of the first diode is connected with the anode of the second diode, and the anode of the first diode and the cathode of the second diode are connected with a power ground;
the cathode of the first diode and the anode of the second diode are jointly formed into an initial radio frequency transmission signal input end of the predistortion unit and a first predistortion radio frequency signal output end of the predistortion unit.
7. The analog predistortion power amplifying device as set out in claim 5, wherein said adjusting unit comprises a first resistor and a first capacitor;
a first end of the first resistor is connected with a first end of the first capacitor, and a second end of the first resistor and a second end of the first capacitor are connected with a power ground;
the first end of the first resistor and the first end of the first capacitor are jointly formed into a first pre-distorted radio frequency signal input end of the adjusting unit and a second pre-distorted radio frequency signal output end of the adjusting unit.
8. The analog predistortion power amplifying device according to claim 5, wherein the directional coupling unit comprises a first directional coupler;
the input end of the first directional coupler is the initial radio frequency transmission signal input end of the directional coupling unit;
the isolation ends of the first directional coupler are an initial radio frequency transmission signal output end of the directional coupling unit and a first predistortion radio frequency signal input end of the directional coupling unit;
the coupling ends of the first directional coupler are a first pre-distortion radio frequency signal output end of the directional coupling unit and a second pre-distortion radio frequency signal input end of the directional coupling unit;
and the through end of the first directional coupler is a predistortion radio frequency signal output end of the directional coupling unit.
9. A micro base station, characterized in that it comprises an analog predistortion power amplification device as claimed in any of the claims 1 to 8.
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