CN221202557U - Radio frequency circuit and electronic equipment thereof - Google Patents
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Abstract
The application provides a radio frequency circuit and an electronic device thereof, wherein the radio frequency circuit comprises: the coupling unit is provided with an input end configured to receive a first signal, a direct-current end configured to output the first signal, and a coupling end configured to output a coupling signal, wherein the coupling signal is obtained by coupling the first signal; the input end of the feedback unit is connected with the coupling end of the coupling unit, and the feedback unit is configured to output a feedback signal according to the coupling signal, and the feedback signal and the coupling signal are in negative correlation; and the input end of the automatic level control unit is connected with the direct end of the coupling unit, the feedback end of the automatic level control unit is connected with the output end of the feedback unit, the automatic level control unit is configured to carry out power attenuation adjustment on the level of the first signal according to the feedback signal so as to output a second signal, and the attenuation amount of the power attenuation adjustment and the feedback signal are in negative correlation. By the method, the automatic level control unit can be regulated and controlled in real time through the feedback signal, so that the control response is faster, and the dynamic range is wider.
Description
Technical Field
The application mainly relates to the technical field of electronic circuits, in particular to a radio frequency circuit and electronic equipment thereof.
Background
In the current wireless receiving system, very high power accuracy and dynamic range are often required, so that stable amplitude control is required to be performed on the output signal of the signal generator, and high-precision power control is realized by using a power feedback mechanism, but because the power accuracy and the dynamic range of the output signal of the signal transmitter are limited by the frequency range, the actual power accuracy and the dynamic range are quite different in different frequency ranges.
The dynamic range is an important index in a wireless receiving system, and the minimum received signal (i.e. sensitivity) depends on the noise factor of the link, the demodulation signal-to-noise ratio threshold, the thermal noise and the bandwidth, while the maximum received signal is mainly determined by the linearity of the active devices in the link. The existing base station radio frequency front end amplifying circuit module generally adopts link gain as a fixed value or performs output limiting point setting through ALC, and the dynamic range of actual work is smaller under the requirement of high linearity index of the base station. Therefore, when the dynamic range of the reverse link needs to be increased under the requirement of linearity index, the limitation of the existing circuit technical scheme is obvious, so that a control circuit meeting the linearity condition and having a larger dynamic range is needed to solve the above-mentioned problems.
Disclosure of utility model
The application mainly aims to provide a radio frequency circuit which can meet the requirement of a base station on a high linearity index without a comparison circuit and has a larger dynamic range.
In order to solve the above problems, the present application provides a radio frequency circuit, which includes: the coupling unit is provided with an input end configured to receive a first signal, a through end configured to output the first signal, and a coupling end configured to output a coupling signal, wherein the coupling signal is obtained by coupling the first signal; the input end of the feedback unit is connected with the coupling end of the coupling unit, and the feedback unit is configured to output a feedback signal according to the coupling signal, and the feedback signal and the coupling signal are in negative correlation; the input end of the automatic level control unit is connected with the straight-through end of the coupling unit, the feedback end of the automatic level control unit is connected with the output end of the feedback unit, and the automatic level control unit is configured to carry out power attenuation adjustment on the level of the first signal according to the feedback signal so as to output a second signal, and the attenuation amount of the power attenuation adjustment is in negative correlation with the feedback signal.
In an embodiment, the feedback unit comprises a detection circuit, an input of the detection circuit being connected to the coupling unit, an output of the detection circuit being connected to the feedback of the automatic level control unit, the detection circuit being configured to generate said feedback signal based on the first signal.
In one embodiment, the detection circuit is a reverse detection circuit.
In an embodiment, the feedback unit further includes an amplifying circuit, an input end of the amplifying circuit is connected to an output end of the detecting circuit, an output end of the amplifying circuit is connected to a feedback end of the automatic level control unit, and the amplifying circuit is used for amplifying the feedback signal.
In an embodiment, the radio frequency circuit further includes a load unit, a first end of the load unit is connected to the isolation end of the coupling unit, and a second end of the load unit is grounded.
In an embodiment, the radio frequency circuit further includes a first amplifying unit, an input end of the first amplifying unit is configured to receive the input signal, an output end of the first amplifying unit is connected to an input end of the coupling unit, and the first amplifying unit is configured to amplify the input signal to obtain a first signal.
In an embodiment, the radio frequency circuit further includes a filtering unit, an input end of the filtering unit is connected to an output end of the first amplifying unit, an output end of the filtering unit is connected to an input end of the coupling unit, and the filtering unit is configured to filter the amplified input signal to obtain the first signal.
In an embodiment, the radio frequency circuit further includes a protection unit, the protection unit is connected to the input end of the first amplifying unit, and the protection unit is used for performing overvoltage protection according to the input signal.
In an embodiment, the radio frequency circuit further includes a second amplifying unit, an input end of the second amplifying unit is connected to the through end of the coupling unit, and the second amplifying unit is configured to amplify the second signal.
In order to solve the above-described problems, the present application provides an electronic device employing a radio frequency circuit including any one of the radio frequency circuits described in the above.
The application provides a radio frequency circuit, which comprises the following structures: the coupling unit is provided with an input end configured to receive a first signal, a through end configured to output the first signal, and a coupling end configured to output a coupling signal, wherein the coupling signal is obtained by coupling the first signal; the input end of the feedback unit is connected with the coupling end of the coupling unit, and the feedback unit is configured to output a feedback signal according to the coupling signal, and the feedback signal and the coupling signal are in negative correlation; the input end of the automatic level control unit is connected with the straight-through end of the coupling unit, the feedback end of the automatic level control unit is connected with the output end of the feedback unit, and the automatic level control unit is configured to carry out power attenuation adjustment on the level of the first signal according to the feedback signal so as to output a second signal, and the attenuation amount of the power attenuation adjustment is in negative correlation with the feedback signal. Through the radio frequency circuit, an integrating circuit is not required to be compared, the input detection is combined to directly control the later-stage ALC circuit through the operational amplifier with improved load capacity, and the direction adjustment of the detection circuit is utilized to realize the larger dynamic range under the condition of meeting the linear index requirement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic diagram of an embodiment of a RF circuit according to the present application;
FIG. 2 is a schematic diagram of a specific circuit structure of an automatic level control circuit according to an embodiment of the present application;
FIG. 3 is a schematic circuit diagram of an embodiment of a RF circuit according to the present application;
FIG. 4 is a schematic diagram of a specific circuit structure of a detection circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a feedback amplifying circuit according to an embodiment of the present application;
FIG. 6 is a diagram of verification data parameters of an embodiment of a RF circuit according to the present application;
fig. 7 is a schematic structural diagram of an embodiment of an electronic device provided by 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 accompanying drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "first," "second," and the like in this disclosure are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the current power control scheme, a gain compensation circuit or an ALC automatic level control circuit is generally adopted to carry out amplitude limiting output on a required radio frequency front end amplifying circuit, if a method that the gain of a radio frequency front end amplifying link is a fixed value is adopted, the size of an output signal cannot be controlled, if an input signal is too large, a rear-stage circuit is easily caused to reach a saturated state, partial signals are caused to be in a nonlinear region, and the signals are lost; if limiting setting of limiting points of the output signals is carried out through the ALC circuit, the output signals are controlled within a certain set amplitude, and real-time regulation and control of limiting of the signal amplitude in a wide range cannot be realized, so that the adjustable attenuation dynamic range is smaller, the response is slow, and a certain influence exists on the time slot signals when the limiting is started and controlled; therefore, the present application proposes a radio frequency circuit scheme to solve the above-mentioned problems and to increase the dynamic range of the reverse link under the condition of linearity index.
In a communication system, the reverse link (REVERSE LINK), also known as a backhaul link, is the link from a mobile phone user to a fixed base station. If the link contains a radio rebroadcast satellite, the reverse link will be up-link (mobile base station to satellite) and down-link (satellite to base station).
The dynamic range refers to the maximum transmitting power and the minimum transmitting power, namely the linearity of the transmitter is not damaged under the maximum transmitting power, the signal to noise ratio of the output signal is kept under the minimum transmitting power, the size of the dynamic range is the linear working range for describing the radio frequency equipment, the wide range means that the sensitivity of the equipment is high, the signal to noise ratio of the equipment is high, and the proper gain distribution is the key for designing the dynamic range.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a radio frequency circuit according to the present application. Wherein, this radio frequency circuit includes: a coupling unit 10, a feedback unit 20, and an automatic level control unit 30; specifically, the input end of the coupling unit 10 is configured to receive a first signal, the through end of the coupling unit 10 is configured to output the first signal, the coupling end of the coupling unit 10 is configured to output a coupling signal, and the coupling signal is obtained by coupling the first signal; the input end of the feedback unit 20 is connected with the coupling end of the coupling unit 10, and the feedback unit 20 is configured to output a feedback signal according to the coupling signal, wherein the feedback signal and the coupling signal are in negative correlation; the input end of the automatic level control unit 30 is connected with the through end of the coupling unit 10, the feedback end of the automatic level control unit 30 is connected with the output end of the feedback unit 20, and the automatic level control unit 30 is configured to perform power attenuation adjustment on the level of the first signal according to the feedback signal so as to output a second signal, and the attenuation amount of the power attenuation adjustment and the feedback signal are in negative correlation.
The coupling unit 10 may be configured to couple a portion of the energy from the signal to a signal detection or monitoring function, such as power measurement and detection. In an embodiment, the coupling unit 10 distributes the power of the first signal according to a certain proportion, and the specific distribution proportion distributes the power according to the selected device of the coupling unit 10 or the power value set according to the actual situation; the feedback unit 20 receives the microwave signals distributed by the coupling unit 10 and then makes control reaction according to the received coupling signals to output corresponding feedback signals; the feedback signal corresponding to the output is input to the automatic level control unit 30, and the automatic level control unit 30 carries out change adjustment on the input first signal in real time according to the signal change of the feedback signal, so as to realize that the second signal is kept within a range required by setting, ensure the linearity of the signal and have a larger dynamic range.
The function of the automatic level control unit 30 is to maintain the output level stable when the input level fluctuates in a larger range, i.e. when the input signal is unstable or changes greatly, the amplitude of the output signal is stable in a constant range after the amplitude of the output signal is stabilized by the automatic level control unit, so as to ensure the output power of the system to be stable.
Optionally, in an embodiment, the automatic level control unit 30 controls the radio frequency circuit by using an automatic level control circuit ALC (Automatic Level Control) or an automatic gain control circuit AGC (Automatic Gain Control), or a combination of both.
Optionally, in an embodiment, referring to fig. 2, fig. 2 is a schematic circuit diagram of an automatic level control circuit according to an embodiment of the radio frequency circuit provided by the present application.
Referring to fig. 3, fig. 3 is a schematic circuit schematic diagram of an embodiment of a radio frequency circuit according to the present application.
Alternatively, in an embodiment, the feedback unit 20 comprises a detection circuit 21, an input terminal of the detection circuit 21 being connected to the coupling unit 10, an output terminal of the detection circuit 21 being connected to a feedback terminal of the automatic level control unit 30, the detection circuit 21 being configured to generate said feedback signal based on the first signal.
The function of the detection circuit 21 or the detector is to select a low frequency signal from the amplitude modulated wave, which means a process of detecting a modulated signal from the modulated signal, the purpose of which is to recover the modulated signal, the operation of which is opposite to the amplitude modulation, and the detection process of which is a process of frequency conversion.
Alternatively, in one embodiment, the detection circuit 21 is a reverse detection circuit. Specifically, the reverse detection circuit performs real-time detection regulation according to an input signal of an input end, for example, when a first signal of the input end increases, an output level value of the reverse detection circuit decreases, so that an attenuation amount of an automatic level control unit in a later-stage circuit is controlled to increase; when the first signal of the input end is reduced, the output level value of the reverse detection circuit is increased, so that the attenuation of an automatic level control unit in a subsequent-stage circuit is controlled to be reduced; thereby realizing real-time feedback adjustment according to the change of the input signal of the input end so as to ensure that the output signal is controlled in a certain range; wherein the response time for the closed loop control link is controlled within the ns-level range. Referring to fig. 4, fig. 4 is a schematic circuit diagram of a detection circuit according to an embodiment of the present application.
Optionally, in an embodiment, the dynamic range of the attenuation amount of the automatic level control unit corresponding to the automatic level control unit in the radio frequency circuit with the control voltage range of 0.5V-2.1V is-52 dB to-3.7 dB, and is consistent with the dynamic range of the reverse detection circuit of the front stage, and the adjustable range is up to 55dB.
Optionally, in an embodiment, the feedback unit further includes an amplifying circuit 22, an input end of the amplifying circuit 22 is connected to an output end of the detecting circuit 21, an output end of the amplifying circuit 22 is connected to a feedback end of the automatic level control unit 30, and the amplifying circuit is configured to amplify the feedback signal.
The amplifying circuit 22 is used for amplifying an input signal, and amplifies the voltage value or the current value of the input signal to a larger value so as to be used for driving output, and the essence is that the amplifying circuit amplifies power, so as to weaken the loss of a tiny signal, keep the same change rule as the original input signal and avoid distortion. Specifically, in one embodiment, the feedback signal in the feedback unit 20 is amplified by a composite amplifier having high output power, high bandwidth, high accuracy and good linearity, and the composite amplifier is configured by connecting two amplifiers in series, so that the characteristics of the two amplifiers are combined to obtain a result which cannot be achieved by using a single amplifier. Referring to fig. 5, fig. 5 is a schematic diagram of a specific structure of a feedback amplifying circuit according to an embodiment of the present application.
Optionally, in an embodiment, the radio frequency circuit 100 further includes a load unit 70, a first end of the load unit 70 is connected to the isolated end of the coupling unit 10, and a second end of the load unit 70 is grounded.
Optionally, in an embodiment, the radio frequency circuit 100 further includes a first amplifying unit 50, an input terminal of the first amplifying unit 50 is configured to receive an input signal, an output terminal of the first amplifying unit 50 is connected to an input terminal of the coupling unit 10, and the first amplifying unit 50 is configured to amplify the input signal to obtain a first signal; specifically, in an embodiment, the first amplifying unit 50 uses a low noise power amplifier (LNA, low Noise Amplifier) as the first stage active module of the radio frequency circuit, which has an important effect on the performance, in which the low noise power amplifier device is easily affected by internal noise, and the noise factor in the first stage circuit is directly added to the total noise factor of the whole circuit system, so that the noise factor needs to be as low as possible to meet the requirement, and has a gain large enough to amplify the signal and suppress the noise of the subsequent stage circuit, and the gain value needs to meet the actual requirement of the radio frequency circuit, if the gain value is too small, the gain effect cannot be generated sufficiently, if the gain value is too large, the linearity requirement of the subsequent stage circuit is high, otherwise, the signal saturation is caused, and the signal distortion is lost.
Optionally, in an embodiment, the radio frequency circuit 100 further includes a filtering unit 60, an input end of the filtering unit 60 is connected to an output end of the first amplifying unit, an output end of the filtering unit 60 is connected to an input end of the coupling unit 10, and the filtering unit 60 is configured to filter the amplified input signal to obtain the first signal. The filtering unit 60 is added in the radio frequency circuit 100 to filter the frequency points of the specific frequency or the frequencies outside the frequency points, so as to obtain a power signal of the specific frequency or eliminate a signal of the specific frequency, mainly to eliminate interference noise in the circuit; the filtering unit 60 may be a filtering unit including, but not limited to, a surface acoustic wave (SAW, surface Acoustic Wave) filter, a resonator-cavity acoustic wave (BAW, bulk Acoustic Wave) filter, or other filters meeting the requirements of use, or a combination thereof.
Optionally, in an embodiment, the radio frequency circuit further includes a protection unit 40, where the protection unit 40 is connected to the input end of the first amplifying unit, and the protection unit is configured to perform overvoltage protection according to an input signal. Wherein, the protection mode is a protection mode for disconnecting the power supply or reducing the voltage of the controlled equipment when the voltage of the protected line exceeds a preset maximum value; the switching power supply has the function of limiting the output voltage within a safe value range in order to protect the post-stage electric equipment from damage when the internal voltage stabilizing loop of the switching power supply fails or the output voltage exceeds a design threshold value due to improper operation of a user. In one embodiment, two diodes are connected in series in the rf circuit to protect the rf circuit.
Optionally, in an embodiment, the radio frequency circuit further includes a second amplifying unit 80, an input terminal of the second amplifying unit 80 is connected to a through terminal of the coupling unit, and the second amplifying unit is configured to amplify the second signal.
Optionally, in an embodiment, the signal range output by the radio frequency circuit 100 to the detection circuit (channel demodulation) may be controlled within a range of-15 dBm to-90 dBm, so as to meet the requirement of the detection circuit (channel demodulation) on the linear range of the input signal. Referring to fig. 6, fig. 6 is a verification data parameter chart of an embodiment of a radio frequency circuit according to the present application. The IP3 input from the port is relatively high about 15dBm, and when the amplitude of the output signal of the final stage amplifying circuit is far from the 1dB compression point, the link linearity index can be properly improved, and in an embodiment, the allowable range of the input signal can be at least-120 dBm to 0dBm under the condition of meeting the linearity index requirement.
In order to solve the above-mentioned problems, the present application further provides an electronic device 200, and referring to fig. 7, fig. 7 is a schematic structural diagram of an embodiment of the electronic device provided by the present application, where the electronic device 200 includes any one of the rf circuits 100 described in the rf circuit 100, so as to achieve that the electronic device has a larger dynamic range under the condition of meeting the linearity requirement.
The application provides a radio frequency circuit, which comprises the following structures: the coupling unit is provided with an input end configured to receive a first signal, a through end configured to output the first signal, and a coupling end configured to output a coupling signal, wherein the coupling signal is obtained by coupling the first signal; the input end of the feedback unit is connected with the coupling end of the coupling unit, and the feedback unit is configured to output a feedback signal according to the coupling signal, and the feedback signal and the coupling signal are in negative correlation; the input end of the automatic level control unit is connected with the straight-through end of the coupling unit, the feedback end of the automatic level control unit is connected with the output end of the feedback unit, and the automatic level control unit is configured to carry out power attenuation adjustment on the level of the first signal according to the feedback signal so as to output a second signal, and the attenuation amount of the power attenuation adjustment is in negative correlation with the feedback signal. Through the radio frequency circuit, an integrating circuit is not required to be compared, the input detection is combined to directly control the later-stage ALC circuit through the operational amplifier with improved load capacity, and the direction adjustment of the detection circuit is utilized to realize the larger dynamic range under the condition of meeting the linear index requirement.
The foregoing has outlined rather broadly the more detailed description of embodiments of the application, wherein the principles and embodiments of the application are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.
Claims (10)
1. A radio frequency circuit, the radio frequency circuit comprising:
the coupling unit is provided with an input end configured to receive a first signal, a through end configured to output the first signal, and a coupling end configured to output a coupling signal, wherein the coupling signal is obtained by coupling the first signal;
The input end of the feedback unit is connected with the coupling end of the coupling unit, and the feedback unit is configured to output a feedback signal according to the coupling signal, and the feedback signal and the coupling signal are in negative correlation;
The automatic level control unit is configured to perform power attenuation adjustment on the level of the first signal according to the feedback signal so as to output a second signal, and the attenuation amount of the power attenuation adjustment and the feedback signal are in negative correlation.
2. The radio frequency circuit according to claim 1, wherein the feedback unit comprises a detection circuit, an input of the detection circuit being connected to the coupling unit, an output of the detection circuit being connected to a feedback of the automatic level control unit, the detection circuit being configured to generate the feedback signal based on the first signal.
3. The radio frequency circuit of claim 2, wherein the detection circuit is a reverse detection circuit.
4. The radio frequency circuit according to claim 2, wherein the feedback unit further comprises an amplifying circuit, an input terminal of the amplifying circuit is connected to an output terminal of the detecting circuit, an output terminal of the amplifying circuit is connected to a feedback terminal of the automatic level control unit, and the amplifying circuit is configured to amplify the feedback signal.
5. The radio frequency circuit of claim 1, further comprising a load unit, a first end of the load unit being connected to the isolated end of the coupling unit, a second end of the load unit being grounded.
6. The radio frequency circuit of claim 1, further comprising a first amplification unit having an input configured to receive an input signal, an output of the first amplification unit coupled to the input of the coupling unit, the first amplification unit configured to amplify the input signal to obtain the first signal.
7. The radio frequency circuit according to claim 6, further comprising a filtering unit, wherein an input terminal of the filtering unit is connected to an output terminal of the first amplifying unit, an output terminal of the filtering unit is connected to an input terminal of the coupling unit, and the filtering unit is configured to filter the amplified input signal to obtain the first signal.
8. The radio frequency circuit of claim 6, further comprising a protection unit coupled to the input of the first amplification unit, the protection unit configured to perform overvoltage protection based on the input signal.
9. The radio frequency circuit of claim 1, further comprising a second amplification unit, an input of the second amplification unit being connected to the pass-through end of the coupling unit, the second amplification unit being configured to amplify the second signal.
10. An electronic device comprising a radio frequency circuit as claimed in any one of claims 1-9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2023227258172 | 2023-10-10 | ||
| CN202322725817 | 2023-10-10 |
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| CN221202557U true CN221202557U (en) | 2024-06-21 |
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| CN202322776794.8U Active CN221202557U (en) | 2023-10-10 | 2023-10-16 | Radio frequency circuit and electronic equipment thereof |
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