CN211352183U - Feedback receiver circuit and electronic equipment - Google Patents
Feedback receiver circuit and electronic equipment Download PDFInfo
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- CN211352183U CN211352183U CN201922493928.9U CN201922493928U CN211352183U CN 211352183 U CN211352183 U CN 211352183U CN 201922493928 U CN201922493928 U CN 201922493928U CN 211352183 U CN211352183 U CN 211352183U
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Abstract
The embodiment of the application discloses feedback receiver circuit uses electronic equipment, includes: the switching circuit is used for responding to a connection signal sent by a processor of the electronic equipment and connecting the corresponding frequency band path; wherein a feedback receiver on the path is configured to receive the coupled radio frequency signal; an adjustable attenuation network for determining an attenuation parameter for attenuating the power of the coupled radio frequency signal in response to the turn-on signal; attenuating the coupled radio frequency signal according to the attenuation parameter so that the power of the attenuated radio frequency signal is within the linear transformation range of the feedback receiver; a feedback receiver for receiving the attenuated radio frequency signal.
Description
Technical Field
The embodiment of the application relates to the field of communication, and relates to but is not limited to a feedback receiver circuit and an electronic device.
Background
At present, a feedback Receiver (FBRX) of an electronic device such as a mobile phone generally uses the same FBRX port to receive radio frequency signals of different network systems and different frequency bands of different network systems. However, radio frequency signals received by the FBRX port are coupled in a certain ratio through a Power Amplifier (PA), and the Power of the coupled radio frequency signals of each frequency band returning to the FBRX port is greatly different due to different coupling coefficients of different couplers. When the transmission power radio frequency signal returned to the FBRX port exceeds the variation range of the input radio frequency signal strength of the feedback receiver, the FBRX port is saturated and loses the linear amplification effect, so that the power output is inaccurate, and the problem of closed-loop power control is caused.
Disclosure of Invention
In view of the above, embodiments of the present application provide a feedback receiver circuit and an electronic device.
The technical scheme of the embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a feedback receiver circuit, and an electronic device includes:
the switching circuit is used for responding to a connection signal sent by a processor of the electronic equipment and connecting the corresponding frequency band path; wherein a feedback receiver on the path is configured to receive the coupled radio frequency signal;
an adjustable attenuation network for determining an attenuation parameter for attenuating the power of the coupled radio frequency signal in response to the turn-on signal; attenuating the coupled radio frequency signal according to the attenuation parameter so that the power of the attenuated radio frequency signal is within the linear transformation range of the feedback receiver;
a feedback receiver for receiving the attenuated radio frequency signal.
In some embodiments, the circuit, wherein the connection signal includes identification information of a path to be connected and an attenuation parameter corresponding to a frequency band when the path is connected;
the switch circuit is used for switching on the path of the corresponding frequency band according to the identification information of the path in the switching-on signal;
the adjustable attenuation network is used for extracting the attenuation parameter from the switch-on signal.
In some embodiments, the circuit, wherein the adjustable attenuation network comprises:
an adjustable attenuation circuit for attenuating the coupled radio frequency signal such that the power of the attenuated radio frequency signal is within a linear transformation range of the feedback receiver;
a control circuit for determining the attenuation parameter in response to the turn-on signal; and controlling the adjustable attenuation circuit to attenuate the coupled radio-frequency signal according to the attenuation parameter.
In some embodiments, the circuit, wherein the adjustable attenuation circuit comprises a variable resistor, and the control circuit is configured to control a resistance value of the variable resistor according to the attenuation parameter to attenuate the coupled radio frequency signal.
In a second aspect, an embodiment of the present application provides an electronic device, including:
a transceiver for outputting a modulated radio frequency signal;
the power amplifier is used for carrying out power amplification on the modulated radio frequency signal so as to meet the power requirement of the radio frequency signal required by wireless communication;
the power coupler is used for coupling the radio-frequency signal output by the power amplifier to obtain a coupled radio-frequency signal for detecting the output power;
the feedback receiver circuit provided in the foregoing embodiment of the first aspect;
a processor for sending a turn-on signal to a switching circuit and an adjustable attenuation network in the feedback receiver circuit.
In some embodiments, the electronic device comprises a register for storing an attenuation parameter; the connection signal comprises identification information and attenuation parameters of a path to be connected;
the processor is further configured to read, from a register, an attenuation parameter for attenuating the power of the coupled radio frequency signal according to the frequency band information to which the connection signal is connected, send the identification information of the path to the switch circuit, and send the attenuation parameter to the adjustable attenuation network.
In some embodiments, the electronic device, wherein,
the processor is used for sending a switch-on signal to the switch circuit;
the switch circuit is used for responding to the connection signal and connecting the corresponding frequency band path;
the power coupler is used for coupling the radio-frequency signal output by the power amplifier to obtain a coupled radio-frequency signal;
the adjustable attenuation network is used for attenuating the coupled radio frequency signals;
the feedback receiver is used for receiving the attenuated radio frequency signal;
the processor is further configured to obtain power of the attenuated radio frequency signal and power of the coupled radio frequency signal output by the feedback receiver, and compare the power of the attenuated radio frequency signal with the power of the coupled radio frequency signal to obtain an attenuation parameter corresponding to the radio frequency signal of the corresponding frequency band; storing an attenuation parameter in the register.
In the embodiment of the application, the coupled radio frequency signal is attenuated through the adjustable attenuation network, and the attenuated radio frequency signal is input into the feedback receiver. Therefore, the power of the radio-frequency signal after attenuation is within the linear conversion range of the feedback receiver, so that the terminal can accurately control the transmitting power, and the problems that when the power of the radio-frequency signal returning to the feedback receiver exceeds the variation range of the intensity of the radio-frequency signal input by the feedback receiver, the linear amplification effect is lost due to saturation, the power output is inaccurate and the like are solved.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.
Fig. 1 is a schematic structural diagram of a feedback receiver according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a feedback receiver according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a feedback receiver according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;
fig. 5A is a schematic structural diagram of a feedback receiver circuit provided in the related art;
fig. 5B is a schematic structural diagram of a feedback receiver circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are intended to illustrate the technical solutions of the present application, but are not intended to limit the scope of the present application.
It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of the present application and do not limit the scope of the present application.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for the convenience of description of the present application, and have no specific meaning by themselves. Thus, "module", "component" or "unit" may be used mixedly.
While the following description will be made taking a mobile electronic device as an example, those skilled in the art will appreciate that the configuration according to the embodiment of the present application can be applied to a fixed type electronic device in addition to elements particularly used for moving purposes.
Fig. 1 is a schematic structural diagram of a feedback receiver provided in an embodiment of the present application, and as shown in fig. 1, a feedback receiver 100 includes a switching circuit 110, an adjustable attenuation network 120, and a feedback receiver 130, where:
a switch circuit 110, configured to switch on a path of a corresponding frequency band in response to a switch-on signal sent by a processor of the electronic device; wherein a feedback receiver on the path is configured to receive the coupled radio frequency signal;
the switch circuit is used for responding to a switch-on signal sent by a processor of the electronic equipment and switching on the path of the corresponding frequency band. In some embodiments, the switch circuit may have a plurality of implementation manners, and in application, the function of the switch circuit may be embodied as a function of a single-pole multi-position switch, for example, the function of implementing a single-pole four-position switch may be implemented, or the function of a single-pole two-position switch may be implemented. The type of the switch circuit depends on the frequency band of the signal to be switched on and the type number of the systems. For example, when the signals to be switched on include a coupled high frequency signal, a coupled intermediate frequency signal, a coupled low frequency signal and a coupled fifth generation (5G, the 5thGeneration) mobile communication system signal, the function of the switch circuit can be embodied as the function of a single-pole four-position switch.
The electronic equipment has a function of transmitting radio frequency signals. For example, a radio frequency signal transceiver, a High Power User Equipment (HPUE), etc. may transmit radio frequency signals, so the electronic device may employ the radio frequency transceiver, etc. to transmit radio frequency signals. Taking the radio frequency signal transceiver as an example, the connection signal may be a radio frequency signal of different standards or different frequency bands sent by the radio frequency signal transceiver. For example, high frequency signals, intermediate frequency signals, low frequency signals, Wideband Code Division Multiple Access (WCDMA), 5G signals, and the like.
Here, the feedback receiver is a receiver that receives a signal coupled by a coupler of the power amplifier. The coupled radio frequency signal may be a radio frequency signal coupled by a coupler. The coupler is a radio frequency device that extracts a small portion of the signal from the radio frequency signal. A coupler typically includes three ports, an input port, an output port, and a coupling port. The input power of the ideal coupler is equal to the sum of the coupled power and the output power. The input end receives the modulated radio frequency signal output by the transceiver, after receiving the signal, most signal power is transmitted from the antenna through the output end, and only a small part of signal power is coupled back by the coupling end. The feedback receiver can obtain the power of the output end emitted from the antenna according to the proportion by receiving the signal power of the coupling end, thereby controlling the emission power of the radio frequency signal.
An adjustable attenuation network 120 for determining an attenuation parameter for attenuating the power of the coupled radio frequency signal in response to the switch-on signal; attenuating the coupled radio frequency signal according to the attenuation parameter so that the power of the attenuated radio frequency signal is within the linear range of the feedback receiver;
here, the adjustable attenuation network 120 is a network for attenuating the signal power at the coupling end to reduce the signal power after coupling. The signal power at the coupling end can be reduced to within the linear range of the feedback receiver, for example, 35dB by the adjustable attenuation network 120, and the reduction is achieved to meet the requirement of 35dB by the adjustable attenuation network, where dB is a relative value representing the signal attenuation and the absolute value of the input and output power is represented by dbm.
Here, the attenuation parameter refers to the relationship between the transmission power a and the measured feedback receiver power B. Namely, the attenuation parameter is a linear relation obtained according to at least two measurements, the attenuation process of the radio frequency signal comprises an attenuator and a coupler of the attenuator, and the attenuation parameter records the power attenuation proportion value of the whole attenuation process. After the power attenuation is carried out on the coupled signal, the signal power can be ensured to be within the linear range of the feedback receiver.
The linear range of the feedback receiver is the range in which the power of the coupler transmitted through the antenna can be calculated from the power of the coupled signal. When the power of the coupled signal input to the feedback receiver exceeds the linear range of the feedback receiver, the power of the input signal corresponds to the saturation region of the linear function, when the input signal changes greatly, the output signal changes slightly, and at the moment, the output signal exceeds the optimal linear range of the feedback receiver, and the measured signal power is inaccurate. For example, in the linear range, the power of the signal is increased by 1db, the power of the signal is measured by 1db more, and when the power range of the signal is in the saturation region, the power of the signal is increased by 1db, the power of the signal is measured by 2db more, and the measured power of the signal is inaccurate. At this time, the power of the coupler transmitted through the antenna cannot be accurately calculated through the power of the coupling end signal.
A feedback receiver 130 for receiving the attenuated radio frequency signal.
In the working process, the switch circuit responds to a switch-on signal sent by a processor of the electronic equipment to switch on the coupled signal of the corresponding frequency band, the attenuation network can be adjusted to receive the coupled signal, the attenuation parameter for attenuating the power of the radio frequency signal is determined, and the feedback receiver receives the attenuated radio frequency signal. The coupled signal is attenuated by the adjustable attenuation network to ensure that the signal power range is within the linear range of the feedback receiver 130. And the feedback receiver receives the attenuated radio frequency signal and performs linear transformation on the radio frequency signal.
For example, assuming that the attenuation parameter corresponds to 5 linear relationships, the attenuation parameter is recorded as 5 steps, and it is defined that when attenuation is performed by 1 step, the power change is 30db, and at this time, the power of the transmitted signal is 20dbm can be calculated by measuring the power of the signal received by the feedback receiver to be-10 dbm.
In the embodiment of the application, the coupled radio frequency signal is attenuated through the adjustable attenuation network, and the attenuated radio frequency signal is input into the feedback receiver. Therefore, the power of the radio-frequency signal after attenuation is within the linear conversion range of the feedback receiver, so that the terminal can accurately control the transmitting power, and the problems that when the power of the radio-frequency signal returning to the feedback receiver exceeds the variation range of the intensity of the radio-frequency signal input by the feedback receiver, the linear amplification effect is lost due to saturation, the power output is inaccurate and the like are solved.
The present embodiment provides a feedback receiver circuit, and referring to fig. 1, a feedback receiver 100 includes a switching circuit 110, an adjustable attenuation network 120, and a feedback receiver 130, where:
the switch circuit 110 is configured to switch on a path of a corresponding frequency band according to the identification information of the path in the switch-on signal; the connection signal comprises identification information of a path to be connected and attenuation parameters corresponding to a frequency band when the path is connected;
here, the identification information of the path is information of a signal frequency, a system, and the like included in the signal path. The switch can be accurately switched on the required signal frequency and system according to the requirement of the controller through the identification information of the access.
For example, when the switch-on signal sent by the processor of the electronic device is a signal for switching on the coupled N77 frequency band of 5G, the switch circuit determines the path of the coupled signal of the N77 frequency band of 5G according to the path identification information, and switches on the corresponding signal path. The signal of the path also comprises an attenuation parameter corresponding to the signal.
An adjustable attenuation network 120 further configured to extract the attenuation parameter from the make signal;
in the actual working process, after the radio-frequency signals of the corresponding frequency bands are switched on, the signals comprise attenuation parameters corresponding to the radio-frequency signals, the adjustable attenuation network can extract the attenuation parameters of the signals, and the signals are attenuated according to the attenuation parameters corresponding to the signals. For example, when the coupled signal of the N77 band of 5G is switched on, it can be extracted that the attenuation parameter corresponding to the signal is attenuation 1, i.e. the measured signal power is 30db less than the emitted signal power.
A feedback receiver 130 for receiving the attenuated radio frequency signal.
In the embodiment of the application, the adjustable attenuation network can perform power attenuation on the coupled signal according to the attenuation parameter corresponding to the frequency band included in the connection signal. And inputting the attenuated radio frequency signal into a feedback receiver. Therefore, the coupled signal can be effectively attenuated, and the signal is ensured to be in the linear transformation range of the feedback receiver.
Fig. 2 is a schematic structural diagram of a feedback receiver provided in an embodiment of the present application, and as shown in fig. 2, a feedback receiver 200 includes a switching circuit 210, an adjustable attenuation network 220, and a feedback receiver 230, where the adjustable attenuation network 220 includes an adjustable attenuation circuit 221 and a control circuit 222, where:
a switch circuit 210, configured to switch on a path of a corresponding frequency band in response to a switch-on signal sent by a processor of the electronic device; wherein a feedback receiver on the path is configured to receive the coupled radio frequency signal;
an adjustable attenuation circuit 221, configured to attenuate the coupled radio frequency signal so that the power of the attenuated radio frequency signal is within a linear transformation range of the feedback receiver;
in actual operation, the adjustable attenuation circuit 221 attenuates the signal power according to the control of the control circuit 222.
A control circuit 222 for determining the attenuation parameter in response to the turn-on signal; controlling the adjustable attenuation circuit to attenuate the coupled radio frequency signal according to the attenuation parameter;
in an actual working process, after the switching circuit switches on the coupled signal, the control circuit 222 of the adjustable attenuation network 220 determines an attenuation parameter corresponding to the signal according to the switched-on signal, and controls the adjustable attenuation circuit 221 of the adjustable attenuation network 220 to attenuate the signal.
A feedback receiver 230 for receiving the attenuated rf signal.
The present embodiment provides a feedback receiver circuit, referring to fig. 2, a feedback receiver 200 includes a switching circuit 210, an adjustable attenuation network 220, and a feedback receiver 230, where the adjustable attenuation network 220 includes an adjustable attenuation circuit 221 and a control circuit 222, where:
a switch circuit 210, configured to switch on a path of a corresponding frequency band in response to a switch-on signal sent by a processor of the electronic device; wherein a feedback receiver on the path is configured to receive the coupled radio frequency signal;
an adjustable attenuation circuit 221, configured to attenuate the coupled radio frequency signal so that the power of the attenuated radio frequency signal is within a linear transformation range of the feedback receiver, where the adjustable attenuation circuit includes a variable resistor;
the variable resistor is also called an adjustable resistor, and is a resistor with the resistance value of the resistor capable of being manually adjusted. The adjustable attenuation network adjusts the resistance value of the adjustable resistor and attenuates the signal power through the regulation and control of the control circuit.
The control circuit 222 is further configured to control a resistance value of the variable resistor according to the attenuation parameter, so as to attenuate the coupled radio frequency signal;
a feedback receiver 230 for receiving the attenuated rf signal.
An electronic device according to an embodiment of the present application is provided, fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application, and as shown in fig. 3, the electronic device 300 includes a transceiver 310, a power amplifier 320, a power coupler 330, a switching circuit 340, an adjustable attenuation network 350, a feedback receiver 360, and a processor 370, where:
a transceiver 310 for outputting a modulated radio frequency signal;
here, the transceiver is a communication device that enables efficient transmission of signals in a channel. The function is to transmit the baseband signal to be transmitted through a series of processes such as modulation, and finally to transmit the signal through the communication device. The signal sent by the transceiver is a radio frequency signal. The radio frequency signal is the frequency of electromagnetic waves which can be effectively transmitted to the space by the radio transmitter through the antenna. The transceiver may be a radio transmitter.
In radio communication, electromagnetic waves are utilized as carriers of information. Information is typically a baseband signal (i.e., a modulated signal) to be transmitted, which is characterized by a relatively low frequency, a relatively wide frequency band, and overlapping with each other. The modulation is a process of loading a baseband signal (i.e., a modulation signal) to be transmitted onto a high-frequency oscillation signal, and is a process of transferring the baseband signal onto a high-frequency carrier, i.e., a process of shifting a frequency spectrum, so as to convert an analog signal or a digital signal to be transmitted into a high-frequency signal suitable for channel transmission. In actual operation, a modulated radio frequency signal may be obtained by a radio transmitter.
A power amplifier 320 for power amplifying the modulated radio frequency signal to meet the power requirement of the radio frequency signal required for wireless communication;
a Power Amplifier (PA) refers to an Amplifier that generates maximum Power output to drive a certain load under a given distortion ratio. Common power amplifiers include various types, for example, radio frequency power amplifiers and high frequency power amplifiers. Radio frequency power amplifiers are an important component of various wireless transmitters. In the front stage circuit of the transmitter, the radio frequency signal power generated by the modulation oscillation circuit is very small, and the radio frequency signal can be fed to an antenna to be radiated after sufficient radio frequency power is obtained through a series of amplifying-buffering stage, intermediate amplifying stage and final power amplifying stage. In order to obtain a sufficiently large radio frequency output power, a radio frequency power amplifier must be employed. In the practical process, a small-power signal transmitted by a transmitter is often amplified to the power radiated by an antenna through a power amplifier, so that the power requirement of a radio-frequency signal required by wireless communication is met.
The power coupler 330 is configured to couple the radio frequency signal output by the power amplifier to obtain a coupled radio frequency signal for detecting output power;
the switch circuit 340 is used for responding to a connection signal sent by a processor of the electronic equipment and connecting the path of the corresponding frequency band; wherein a feedback receiver on the path is configured to receive the coupled radio frequency signal;
an adjustable attenuation network 350 for determining an attenuation parameter for attenuating the power of the coupled radio frequency signal in response to the turn-on signal; attenuating the coupled radio frequency signal according to the attenuation parameter so that the power of the attenuated radio frequency signal is within the linear transformation range of the feedback receiver;
a feedback receiver 360 for receiving the attenuated radio frequency signal;
a processor 370 for sending a make signal to the switching circuit and the adjustable attenuation network in the feedback receiver circuit.
The processor (CPU) is responsible for implementing all control functions of the feedback receiver. The processor receives commands from the front and back panel network ports, General Purpose Interface Bus (GPIB) ports and serial ports, and then converts them to settings for the state of the instrument via the internal bus. In this embodiment, the processor 370 may enable the user to perform state control of the switching circuit and the adjustable attenuation network in the feedback receiver circuit. For example, a switch-on signal may be transmitted to a switch circuit of the feedback receiver circuit, and the switch circuit may be controlled to switch on a signal of a certain system or a certain frequency band.
An electronic device according to an embodiment of the present application is provided, fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application, and as shown in fig. 4, the electronic device 400 includes a transceiver 410, a power amplifier 420, a power coupler 430, a switching circuit 440, an adjustable attenuation network 450, a feedback receiver 460, a processor 470, and a register 480, where:
a transceiver 410 for outputting a modulated radio frequency signal;
a power amplifier 420 for power amplifying the modulated radio frequency signal to meet a power requirement of a radio frequency signal required for wireless communication;
the power coupler 430 is configured to couple the radio frequency signal output by the power amplifier to obtain a coupled radio frequency signal for detecting output power;
a switch circuit 440, configured to switch on a path of a corresponding frequency band in response to a switch-on signal sent by a processor of the electronic device; the feedback receiver on the path is used for receiving the coupled radio frequency signal, and the connection signal comprises identification information and attenuation parameters of the path to be connected;
an adjustable attenuation network 450 for determining an attenuation parameter for attenuating the power of the coupled radio frequency signal in response to the turn-on signal; attenuating the coupled radio frequency signal according to the attenuation parameter so that the power of the attenuated radio frequency signal is within the linear range of the feedback receiver;
a feedback receiver 460 for receiving the attenuated radio frequency signal;
the processor 470 is further configured to read, from a register, an attenuation parameter for attenuating the power of the coupled radio frequency signal according to the frequency band information of the connection signal, send the identification information of the path to the switch circuit, and send the attenuation parameter to the adjustable attenuation network;
here, the frequency band information is a frequency band of the coupled signal, and may be a coupled high frequency band signal, a coupled middle frequency band signal, or a coupled low frequency band signal.
The function of the register is to store binary codes, and the register is formed by combining flip-flops with storage functions. The Register may be a Non-Volatile Register (NV), which refers to a computer memory in which stored data does not disappear when current is turned off. NV may be Read Only Memory (ROM) or flash Memory. The register is used for storing attenuation parameters corresponding to signals of different systems and different frequency bands.
In the working process, a modulated radio frequency signal is obtained through a transceiver, and the radio frequency signal is subjected to power amplification through a power amplifier so as to meet the power requirement of the radio frequency signal required by wireless communication; the radio-frequency signals output by the power amplifier are coupled through the power coupler to obtain coupled radio-frequency signals for detecting output power, attenuation parameters corresponding to the signals are read from the register according to selected frequency band information connected by a processor of the electronic equipment, and the attenuation parameters are sent to the adjustable attenuation network.
The electronic device includes a register 480 for storing the attenuation parameter.
In the embodiment of the application, the attenuation parameter is stored in the register, so that the attenuation value of the attenuation network can be automatically switched when the power of the signal entering the feedback receiver exceeds the range. In this way, FBRX is always operated in the optimal linear range.
An embodiment of the present application provides an electronic device, which includes a processor, a switching circuit, a power coupler, an adjustable attenuation network, and a feedback receiver, wherein:
the processor is used for sending a switch-on signal to the switch circuit;
the switch circuit is used for responding to the connection signal and connecting the corresponding frequency band path;
the power coupler is used for coupling the radio-frequency signal output by the power amplifier to obtain a coupled radio-frequency signal;
the adjustable attenuation network is used for attenuating the coupled radio frequency signals;
the feedback receiver is used for receiving the attenuated radio frequency signal;
the processor is further configured to obtain power of the attenuated radio frequency signal and power of the coupled radio frequency signal output by the feedback receiver, and compare the power of the attenuated radio frequency signal with the power of the coupled radio frequency signal to obtain an attenuation parameter corresponding to the radio frequency signal of the corresponding frequency band; storing an attenuation parameter in the register.
Fig. 5A is a schematic structural diagram of a Feedback Receiver circuit provided in the related art, as shown in fig. 5A, different frequency bands of different network systems and different network systems may enter a Feedback Receiver (FBRX) 502 when the same single-pole four-position switch 501 channel (for example, each frequency band of Long Term Evolution (LTE), each frequency band of Wideband Code Division Multiple Access (WCDMA), and each frequency band of New Radio communication (New Radio, NR) all travels the same channel) is taken).
It can be seen that this solution has the following drawbacks: 1) signals of different communication systems pass through couplers of different Power Amplifiers (PA), and the coupling coefficients of the couplers are different, so that the Power of the signals returned to the FBRX after coupling of each frequency band is greatly different. 2) In addition, since the linear range of the FBRX is only 35dB, the Power range of the High-Power Microwave (HPM) and the Medium-Power Microwave (MPM) that need to cover the PA is 23dBm to-10 dBm, and only 2dB of margin is provided, if B41 is needed to be added at the same time, the High-Power User Equipment (HPUE) is supported by the FBRX, and the maximum transmission Power of the HPUE can reach 27dBm, at this time, the covered Power range is 27dBm to-10 dBm, which exceeds the linear range of the FBRX, which may cause inaccurate output Power of the FBRX, and cause a problem of closed-loop Power control.
Fig. 5B is a schematic structural diagram of a feedback receiver circuit according to an embodiment of the present disclosure; as shown in fig. 5B, feedback receiver circuit 500 includes a single pole four position switch 510, an adjustable attenuation network 520, and a FBRX 530. Wherein the adjustable attenuation network 520 comprises a variable resistor 521 and a control circuit 522, and comprises a control circuit, such that the attenuation value of the attenuation network can be adaptively adjusted.
The adjustable attenuation network 520 may allow the power into the feedback receiver to be in its linear range, allowing the transceiver to accurately control the transmit power.
The adjustable attenuation network 520 controls the radio frequency signal to be adaptively attenuated, so that the attenuated radio frequency signal is maintained in the linear range of the FBRX port in the following working process:
step 501: the processor controls a switch 510 of the feedback receiver circuit 500, which switches on a path of coupled radio frequency signals;
here, the coupled rf signal includes four paths, which are a coupled high frequency signal, a coupled intermediate frequency signal, a coupled low frequency signal, and a coupled 5G N77 frequency band signal.
Step 502: after the switch 510 is switched on, the coupled radio frequency signal is input into the adjustable attenuation network 520 for power attenuation, and a radio frequency signal after power attenuation is obtained;
step 503: the control circuit 522 of the adjustable attenuation network 520 inputs the attenuated rf signal to the FBRX 530;
step 504: the processor obtains the power of the radio frequency signal output by FBRX 530;
step 505: the processor compares the power of the radio frequency signal of the output FBRX with the power of the coupled radio frequency signal to obtain an attenuation value corresponding to the radio frequency signal of the connected frequency band;
step 506: the processor stores the attenuation value in a Non-Volatile Register (NV) to obtain attenuation values corresponding to radio frequency signals with different frequencies;
step 507: the processor sets the range of the output FBRX radio frequency signal;
step 508: and the processor judges the radio frequency signal of the output FBRX, reads the attenuation value corresponding to the frequency band in the nonvolatile register when the output FBRX exceeds the set signal range, and attenuates the power of the input FBRX radio frequency signal, so that the FBRX always works in the optimal linear range.
It can be seen that compared to the feedback receiver in the related art, the feedback receiver provided in the embodiments of the present application increases the calibration of the adjustable attenuation network during calibration, and ensures that the FBRX is in its linear range; dynamically adjusting attenuation value settings of the attenuation network; ensuring that the FBRX measures different results; and stores the change in attenuation network attenuation values in the NV.
In actual operation, a use range is set for the result obtained by the FBRX, and if the use range is out of the use range, the attenuation value of the attenuation network is automatically switched and the stored change values in NV are combined to calculate the current power, so that the FBRX always operates in an optimal linear range.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments. The above description is only a preferred embodiment of the present application, and 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 of the present application, or which are directly or indirectly applied to other related technical fields, are included in the scope of the present application.
Claims (7)
1. A feedback receiver circuit for use in an electronic device, the circuit comprising:
the switching circuit is used for responding to a connection signal sent by a processor of the electronic equipment and connecting the corresponding frequency band path; wherein a feedback receiver on the path is configured to receive the coupled radio frequency signal;
an adjustable attenuation network for determining an attenuation parameter for attenuating the power of the coupled radio frequency signal in response to the turn-on signal; attenuating the coupled radio frequency signal according to the attenuation parameter so that the power of the attenuated radio frequency signal is within the linear transformation range of the feedback receiver;
a feedback receiver for receiving the attenuated radio frequency signal.
2. The circuit according to claim 1, wherein the connection signal includes identification information of a path to be connected and an attenuation parameter corresponding to a frequency band in which the path is connected;
the switch circuit is used for switching on the path of the corresponding frequency band according to the identification information of the path in the switching-on signal;
the adjustable attenuation network is used for extracting the attenuation parameter from the switch-on signal.
3. The circuit of claim 1, wherein the adjustable attenuation network comprises:
an adjustable attenuation circuit for attenuating the coupled radio frequency signal such that the power of the attenuated radio frequency signal is within a linear transformation range of the feedback receiver;
a control circuit for determining the attenuation parameter in response to the turn-on signal; and controlling the adjustable attenuation circuit to attenuate the coupled radio-frequency signal according to the attenuation parameter.
4. The circuit of claim 3, wherein the adjustable attenuation circuit includes a variable resistor, and wherein the control circuit is configured to control a resistance of the variable resistor according to the attenuation parameter to attenuate the coupled radio frequency signal.
5. An electronic device, characterized in that the device comprises:
a transceiver for outputting a modulated radio frequency signal;
the power amplifier is used for carrying out power amplification on the modulated radio frequency signal so as to meet the power requirement of the radio frequency signal required by wireless communication;
the power coupler is used for coupling the radio-frequency signal output by the power amplifier to obtain a coupled radio-frequency signal for detecting the output power;
the feedback receiver circuit of any of claims 1 to 4;
a processor for sending a turn-on signal to a switching circuit and an adjustable attenuation network in the feedback receiver circuit.
6. The electronic device of claim 5, wherein the electronic device includes a register to store an attenuation parameter; the connection signal comprises identification information and attenuation parameters of a path to be connected;
the processor is further configured to read, from a register, an attenuation parameter for attenuating the power of the coupled radio frequency signal according to the frequency band information to which the connection signal is connected, send the identification information of the path to the switch circuit, and send the attenuation parameter to the adjustable attenuation network.
7. The electronic device of claim 6,
the processor is used for sending a switch-on signal to the switch circuit;
the switch circuit is used for responding to the connection signal and connecting the corresponding frequency band path;
the power coupler is used for coupling the radio-frequency signal output by the power amplifier to obtain a coupled radio-frequency signal;
the adjustable attenuation network is used for attenuating the coupled radio frequency signals;
the feedback receiver is used for receiving the attenuated radio frequency signal;
the processor is further configured to obtain power of the attenuated radio frequency signal and power of the coupled radio frequency signal output by the feedback receiver, and compare the power of the attenuated radio frequency signal with the power of the coupled radio frequency signal to obtain an attenuation parameter corresponding to the radio frequency signal of the corresponding frequency band; storing an attenuation parameter in the register.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922493928.9U CN211352183U (en) | 2019-12-31 | 2019-12-31 | Feedback receiver circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922493928.9U CN211352183U (en) | 2019-12-31 | 2019-12-31 | Feedback receiver circuit and electronic equipment |
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| CN211352183U true CN211352183U (en) | 2020-08-25 |
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| CN201922493928.9U Active CN211352183U (en) | 2019-12-31 | 2019-12-31 | Feedback receiver circuit and electronic equipment |
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