CN113315536B - Radio frequency circuit and electronic device - Google Patents
Radio frequency circuit and electronic device Download PDFInfo
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- CN113315536B CN113315536B CN202110592259.XA CN202110592259A CN113315536B CN 113315536 B CN113315536 B CN 113315536B CN 202110592259 A CN202110592259 A CN 202110592259A CN 113315536 B CN113315536 B CN 113315536B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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Abstract
The application discloses radio frequency circuit and electronic equipment belongs to the technical field of communication. The problem that each element in the existing radio frequency circuit is easily damaged or destroyed by the influence of a high-power radio frequency signal can be solved. The radio frequency circuit comprises a transceiver, a transmitting circuit, a first receiving circuit, a second receiving circuit, a first single-pole double-throw switch, a power detection circuit and an antenna. The power detection circuit in the radio frequency circuit can detect the power of the radio frequency signal received by the antenna in time, the high-power radio frequency signal with the detected power larger than the preset power threshold value can be transmitted to the ground, the high-power radio frequency signal is prevented from entering other elements of the receiving circuit and a transceiver connected with the receiving circuit, and therefore the high-power radio frequency signal is prevented from damaging or destroying all elements in the radio frequency circuit, and the effect of effectively protecting the radio frequency circuit in a high-power environment is achieved.
Description
Technical Field
The application belongs to the technical field of communication, and particularly relates to a radio frequency circuit and electronic equipment.
Background
In an integrated circuit module of the conventional electronic equipment, a receiving path for receiving radio frequency signals lacks an effective protection mechanism, and after high-power radio frequency signals enter an antenna of the electronic equipment, some elements without high-power resistance in the receiving path are easily damaged or destroyed, so that the electronic equipment has the condition of poor signals or even cannot receive and transmit the radio frequency signals any more. Therefore, how to better protect the receiving path of the electronic device so as to adapt the electronic device to the current complex environment becomes an urgent problem to be solved.
The currently common method for protecting the receiving path of the electronic device is to process through software, and is specifically implemented as follows: the method comprises the steps of detecting received radio frequency signals, and bypassing each element without high-power resistance in a receiving channel after the radio frequency signals with larger power are detected so as to prevent the high-power radio frequency signals from passing through the elements and further avoid damaging or destroying the elements. However, the high-power rf signal can still enter the rf module connected to the receiving path, thereby causing damage or damage to the rf module. In addition, the processing by software requires a certain time for buffering, the mechanism is delayed, and even before the protection effect is achieved, the elements are damaged or destroyed.
Disclosure of Invention
An object of the embodiments of the present application is to provide a radio frequency circuit and an electronic device, which can solve the problem that each component in the existing radio frequency circuit is easily affected by a high-power radio frequency signal and is damaged or destroyed.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a radio frequency circuit, including a transceiver, a transmitting circuit, a first receiving circuit, a second receiving circuit, a first single-pole double-throw switch, a power detection circuit, and an antenna; wherein:
one end of the transmitting circuit is connected with the transceiver, and the other end of the transmitting circuit is connected with the first movable end of the first single-pole double-throw switch; one end of the first receiving circuit is connected with the transceiver, and the other end of the first receiving circuit is connected with the first movable end of the first single-pole double-throw switch; the control end of the first single-pole double-throw switch is connected to the antenna through the power detection circuit, and the fixed end of the first single-pole double-throw switch is connected with the antenna; one end of the second receiving circuit is grounded, and the other end of the second receiving circuit is connected with the second movable end of the first single-pole double-throw switch;
the power detection circuit is used for carrying out power detection on the radio-frequency signal received by the antenna;
the first single-pole double-throw switch is communicated with the antenna and the first receiving circuit when the power detection circuit detects that the power of the radio-frequency signal received by the antenna is smaller than or equal to a preset power threshold value; and under the condition that the power detection circuit detects that the power of the radio-frequency signal received by the antenna is greater than the preset power threshold value, the first single-pole double-throw switch is communicated with the antenna and the second receiving circuit.
In a second aspect, an embodiment of the present application provides an electronic device including the radio frequency circuit as described in the first aspect.
In this embodiment of the application, a power detection circuit is disposed in the radio frequency circuit, the power detection circuit performs power detection on the radio frequency signal received by the antenna, the first single-pole double-throw switch communicates the antenna with the first receiving circuit when it is detected that the power of the radio frequency signal received by the antenna is less than or equal to a preset power threshold, and the first single-pole double-throw switch communicates the antenna with the second receiving circuit when the power detection circuit detects that the power of the radio frequency signal received by the antenna is greater than the preset power threshold. Therefore, the radio frequency circuit realizes timely detection of the power of the radio frequency signal received by the antenna through the power detection circuit, the high-power radio frequency signal with the detected power larger than the preset power threshold value can be transmitted to the ground, and the high-power radio frequency signal is prevented from entering other elements of the receiving circuit and a transceiver connected with the receiving circuit, so that the high-power radio frequency signal is prevented from damaging or destroying all elements in the radio frequency circuit, and the effect of effectively protecting the radio frequency circuit in a high-power environment is realized.
Drawings
Fig. 1 is a schematic diagram of an rf circuit according to an embodiment of the present application.
Fig. 2 is a schematic diagram of an rf circuit according to another embodiment of the present application.
Fig. 3 is a schematic diagram of an rf circuit according to another embodiment of the present application.
Fig. 4 is a schematic diagram of an rf circuit according to another embodiment of the present application.
Fig. 5 is a schematic flow chart of a method for transceiving radio frequency circuitry in an embodiment of the present application.
Fig. 6 is a schematic flow chart of a method for transceiving radio frequency circuitry in another embodiment of the present application.
Fig. 7 is a schematic structural diagram of an electronic device in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The radio frequency circuit provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Fig. 1 is a schematic diagram of an rf circuit according to an embodiment of the present application. The radio frequency circuitry may include a transceiver 100, a transmit circuit 110, a first receive circuit 120, a second receive circuit 130, a first single pole double throw switch 140, a power detection circuit 150, and an antenna 160. Wherein, as shown in fig. 1:
one end of the transmitting circuit 110 is connected to the transceiver 100, the other end of the transmitting circuit 110 is connected to the first moving end of the first spdt switch 140, one end of the first receiving circuit 120 is connected to the transceiver 100, the other end of the first receiving circuit 120 is connected to the first moving end of the first spdt switch 140, the control end of the first spdt switch 140 is connected to the antenna 160 through the power detection circuit 150, the stationary end of the first spdt switch 140 is connected to the antenna 160, one end of the second receiving circuit 130 is grounded, and the other end of the second receiving circuit 130 is connected to the second moving end of the first spdt switch 140.
The power detection circuit 150 is used for performing power detection on the rf signal received by the antenna 160.
When the power detection circuit 150 detects that the power of the rf signal received by the antenna 160 is less than or equal to the preset power threshold, the first single-pole double-throw switch 140 connects the antenna 160 and the first receiving circuit 120. When the power detection circuit 150 detects that the power of the rf signal received by the antenna 160 is greater than the preset power threshold, the first single-pole double-throw switch 140 connects the antenna 160 and the second receiving circuit 130.
The transmitting circuit 110 is configured to transmit a radio frequency signal received by the transceiver 100 to the antenna 160 through the first single-pole double-throw switch 140, and the first receiving circuit 120 or the second receiving circuit 130 is configured to receive the radio frequency signal received by the antenna 160. The transceiver 100 may be a radio frequency module in an electronic device, and the radio frequency module may be a wireless communication technology WiFi module capable of receiving and transmitting radio frequency signals, a Global Positioning System (GPS) module capable of receiving radio frequency signals, and the like. When the transceiver is a GPS module, the radio frequency circuit does not comprise a transmission path or does not work.
When the power detection circuit 150 detects that the power of the radio frequency signal received by the antenna 160 is less than or equal to the preset power threshold, the power detection circuit 150 outputs a low level, and the first single-pole double-throw switch 140 connects the antenna 160 and the first receiving circuit 120. When the power detection circuit 150 detects that the power of the rf signal received by the antenna 160 is greater than the preset power threshold, the power detection circuit 150 outputs a high level, and the first single-pole double-throw switch 140 connects the antenna 160 and the second receiving circuit 130.
In this embodiment of the application, a power detection circuit is disposed in the radio frequency circuit, the power detection circuit performs power detection on the radio frequency signal received by the antenna, the first single-pole double-throw switch communicates the antenna with the first receiving circuit when it is detected that the power of the radio frequency signal received by the antenna is less than or equal to a preset power threshold, and the first single-pole double-throw switch communicates the antenna with the second receiving circuit when the power detection circuit detects that the power of the radio frequency signal received by the antenna is greater than the preset power threshold. Therefore, the radio frequency circuit realizes timely detection of the power of the radio frequency signal received by the antenna through the power detection circuit, the high-power radio frequency signal with the detected power larger than the preset power threshold value can be transmitted to the ground, and the high-power radio frequency signal is prevented from entering other elements of the receiving circuit and a transceiver connected with the receiving circuit, so that the high-power radio frequency signal is prevented from damaging or destroying all elements in the radio frequency circuit, and the effect of effectively protecting the radio frequency circuit in a high-power environment is realized.
Fig. 2 is a schematic structural diagram of a radio frequency circuit in another embodiment of the present application, and it should be noted that fig. 2 is a schematic structural diagram of the radio frequency circuit further refined on the basis of fig. 1, and please refer to the embodiment of fig. 1 for connection relationships between various elements and various circuits that are the same as those in the schematic structural diagram of the radio frequency circuit shown in fig. 1 (only the elements and the various circuits are labeled in fig. 2), which is not repeated herein.
As shown in fig. 2, the power detection circuit 150 includes a comparator 151, a detector 152, and a specified voltage source 153. A first voltage input terminal of the comparator 151 is connected to the antenna 160 through the detector 152, a second voltage input terminal of the comparator 151 is connected to a specified voltage source 153, and an output terminal of the comparator 151 is connected to a control terminal of the first single pole double throw switch 140.
The detector 152 is configured to output a corresponding first voltage when receiving the radio frequency signal, and send the first voltage to a first voltage input terminal of the comparator 151. The designated voltage source 153 is configured to generate a second voltage corresponding to the preset power threshold, and send the second voltage to a second voltage input terminal of the comparator 151. The comparator 151 is configured to compare a magnitude relationship between the first voltage and the second voltage, and when the first voltage is less than or equal to the second voltage, the power of the radio frequency signal received by the antenna 160 is less than or equal to a preset power threshold; in the case that the first voltage is greater than the second voltage, the power of the radio frequency signal received by the antenna 160 is greater than the preset power threshold.
The comparator 151 is configured to output a high level through the output terminal when the first voltage is greater than the second voltage, or output a low level through the output terminal when the first voltage is less than or equal to the second voltage. The first voltage input terminal of the comparator 151 may be a positive pin of a pin of the comparator, the second voltage input terminal may be a negative pin of the comparator, and the voltage input to the comparator 151 through the negative pin may be used as a reference voltage, the voltage input through the positive pin may be compared with the reference voltage, and a high level or a low level may be correspondingly output according to the comparison result.
In addition to the designated voltage source 153 shown in fig. 2, in order to expand the applicable scenario of the rf circuit, as shown in fig. 3, the second voltage input terminal of the comparator 151 may be sequentially connected to a first adjustable resistor 1531 and a voltage source 1533, and the first adjustable resistor 1531 is further connected to the ground through a second adjustable resistor 1532. By adjusting the ratio of the first adjustable resistor 1531 to the second adjustable resistor 1532, the voltage generated by the voltage source 1533 can be adjusted to a plurality of voltages to adapt to applications in different scenarios.
Assuming that the first adjustable resistor is R1, the second adjustable resistor is R2, and the voltage generated by the voltage source is Vcc, the reference voltage Vref can be calculated by Vref-Vcc R2/(R1+ R2).
In one embodiment, a single-pole single-throw switch 180 and a power coupler 170 are further connected between the power detection circuit 150 and the antenna 160, a single-pole single-throw switch 180 and a power coupler 170 are further connected between the stationary end of the first single-pole double-throw switch 140 and the antenna 160, and the single-pole single-throw switch 180 and the power coupler 170 are connected in series or in parallel.
As shown in fig. 2, when the single-pole single-throw switch 180 and the power coupler 170 are connected in parallel, the first port of the power coupler 170 is connected to the antenna 160, the coupled port of the power coupler 170 is connected to the detector 152, the second port of the power coupler 170 is connected to the stationary end of the first single-pole double-throw switch 140, and the single-pole single-throw switch 180 is connected in parallel between the first port and the second port.
As shown in fig. 4 (fig. 4 is a schematic structural diagram of a radio frequency circuit in which the connection mode between the single-pole single-throw switch 180 and the power coupler 170 is adjusted to be a series connection based on fig. 2), when the single-pole single-throw switch 180 and the power coupler 170 are connected in series, the first port of the power coupler 170 is connected to the antenna 160, the coupled port of the power coupler 170 is connected to the detector 152 through the single-pole single-throw switch 180, and the second port of the power coupler 170 is connected to the stationary end of the first single-pole double-throw switch 140.
The power coupler 170 is configured to perform coupling sampling on the radio frequency signal received by the antenna 160 according to a certain coupling coefficient ratio, and output the coupled radio frequency signal through the coupling port, so as to prevent the radio frequency signal with excessive power from damaging or destroying various elements in the radio frequency circuit.
In one embodiment, as shown in fig. 2, the transmitting circuit includes a driving amplifier 111, a power amplifier 112, a second single-pole double-throw switch 113, a filter 114, and a combiner 115, which are connected in sequence. The transceiver 100 is connected to the power amplifier 112 through the driving amplifier 111, the power amplifier 112 is connected to a first moving end of the second single-pole double-throw switch 113, a stationary end of the second single-pole double-throw switch 113 is connected to the filter 114, and the combiner 115 is connected to a first moving end of the first single-pole double-throw switch 140.
As shown in fig. 2, the first receiving circuit includes a low noise amplifier 121, a second single-pole double-throw switch 113, a filter 114, and a combiner 115, which are connected in this order. Wherein, the enable terminal of the transceiver 100 is respectively connected to the enable terminal of the low noise amplifier 121 and the enable terminal of the single-pole single-throw switch 180, and the transceiver 100 is connected to the second moving terminal of the second single-pole double-throw switch 113 through the low noise amplifier 121. The second receiving circuit 130 includes a ground resistor 131, and the ground resistor 131 is used for impedance matching of the received radio frequency signal.
The grounding resistor can be a 50 ohm resistor, so that the radio frequency signal received by the antenna can be prevented from being directly transmitted to the ground, and the safety of the environment where the radio frequency circuit is located is improved.
In one embodiment, as shown in fig. 2, in the case of a parallel connection between the single-pole single-throw switch 180 and the power coupler 170, the transceiver 100 is used to control the low noise amplifier 121 to start operating and the single-pole single-throw switch 180 to be opened, or to control the low noise amplifier 121 to stop operating and the single-pole single-throw switch 180 to be closed.
As shown in fig. 4, in the case of the series connection between the single-pole single-throw switch 180 and the power coupler 170, the transceiver 100 is used to control the low noise amplifier 121 to start operating and the single-pole single-throw switch 180 to be closed, or to control the low noise amplifier 121 to stop operating and the single-pole single-throw switch 180 to be opened.
In one embodiment, as shown in fig. 2, in the case that the first single-pole double-throw switch 140 is connected to a first receiving circuit (not labeled in fig. 2, it is understood that the first receiving circuit includes the driving amplifier 111, the power amplifier 112, the second single-pole double-throw switch 113, the filter 114 and the combiner 115 which are connected in sequence as shown in fig. 2), and the single-pole single-throw switch 180 and the power coupler 170 are connected in parallel, the radio frequency signal received by the antenna 160 is transmitted to the power coupler 170, the detector 152, the comparator 151, the first single-pole double-throw switch 140, the first receiving circuit and the transceiver 100 in sequence.
As shown in fig. 2, when the first single-pole double-throw switch 140 is connected to the second receiving circuit 130 and the single-pole single-throw switch 180 is connected in parallel to the power coupler 170, the rf signal received by the antenna 160 is transmitted to the power coupler 170, the detector 152, the comparator 151, the first single-pole double-throw switch 140, the second receiving circuit 130, and the ground in this order.
In one embodiment, as shown in fig. 4, in the case where the first spdt switch 140 is connected to a first receiving circuit (not labeled in fig. 4, it is understood that the first receiving circuit includes the driving amplifier 111, the power amplifier 112, the second spdt switch 113, the filter 114, and the combiner 115 connected in sequence as shown in fig. 4), and the spdt switch 180 and the power coupler 170 are connected in series, the radio frequency signal received by the antenna 160 is transmitted to the power coupler 170, the spdt switch 180, the detector 152, the comparator 151, the first spdt switch 140, the first receiving circuit, and the transceiver 100 in sequence.
As shown in fig. 4, when the first single-pole double-throw switch 140 is connected to the second receiving circuit 130 and the single-pole single-throw switch 180 is connected in series with the power coupler 170, the radio frequency signal received by the antenna 160 is transmitted to the power coupler 170, the single-pole single-throw switch 180, the detector 152, the comparator 151, the first single-pole double-throw switch 140, the second receiving circuit 130, and the ground in this order.
In one embodiment, as shown in fig. 2, with the parallel connection between the single-pole single-throw switch 180 and the power coupler 170, the radio frequency signal received by the transceiver 100 is transmitted to the driving amplifier 111, the power amplifier 112, the second single-pole double-throw switch 113, the filter 114, the combiner 115, the first single-pole double-throw switch 140, the single-pole single-throw switch 180, and the antenna 160 in sequence.
As shown in fig. 4, in the case where the single-pole single-throw switch 180 and the power coupler 170 are connected in series, the radio frequency signal received by the transceiver 100 is sequentially transmitted to the driver amplifier 111, the power amplifier 112, the second single-pole double-throw switch 113, the filter 114, the combiner 115, the power coupler 170, and the antenna 160.
In one embodiment, as shown in fig. 3, a voltage regulator 154 is connected in parallel between the output terminal of the comparator 151 and the ground, the voltage regulator 154 is broken down when the output voltage of the output terminal of the comparator 151 is greater than the maximum value in the corresponding voltage bearing range of the first single-pole double-throw switch 140, and the voltage across the broken-down voltage regulator 154 is the maximum value. It is possible to achieve an effect of further ensuring that the first single pole double throw switch 140 is not damaged or destroyed.
In the above embodiment, the rf circuit is provided with a power detection circuit, the power detection circuit is used to perform power detection on the rf signal received by the antenna, when it is detected that the power of the rf signal received by the antenna is less than or equal to a preset power threshold, the first single-pole double-throw switch connects the antenna to the first receiving circuit, and when the power detection circuit detects that the power of the rf signal received by the antenna is greater than the preset power threshold, the first single-pole double-throw switch connects the antenna to the second receiving circuit. Therefore, the radio frequency circuit realizes timely detection of the power of the radio frequency signal received by the antenna through the power detection circuit, the high-power radio frequency signal with the detected power larger than the preset power threshold value can be transmitted to the ground, and the high-power radio frequency signal is prevented from entering other elements of the receiving circuit and a transceiver connected with the receiving circuit, so that the high-power radio frequency signal is prevented from damaging or destroying all elements in the radio frequency circuit, and the effect of effectively protecting the radio frequency circuit in a high-power environment is realized.
Fig. 5 is a schematic flow chart of a transceiving method of a radio frequency circuit in an embodiment of the present application, and when the transceiving method of the radio frequency circuit is applied to the radio frequency circuit provided in any of the above embodiments, the transceiving method of the radio frequency circuit may include:
s502, determining the working mode of the transceiver.
S504, if the transceiver is determined to work in the mode of transmitting the radio frequency signals, the radio frequency signals received by the transceiver are transmitted to the antenna through the transmitting circuit and the first single-pole double-throw switch in sequence.
S506, if the transceiver is determined to work in a mode of receiving radio frequency signals, power detection is carried out on the radio frequency signals received by the antenna through the power detection circuit; under the condition that the power detection circuit detects that the power of the radio-frequency signal received by the antenna is smaller than or equal to a preset power threshold value, the first single-pole double-throw switch is communicated with the antenna and the first receiving circuit; and under the condition that the power detection circuit detects that the power of the radio-frequency signal received by the antenna is greater than a preset power threshold value, the first single-pole double-throw switch is communicated with the antenna and the second receiving circuit.
In this embodiment of the application, a power detection circuit is disposed in the radio frequency circuit, the power detection circuit performs power detection on the radio frequency signal received by the antenna, the first single-pole double-throw switch communicates the antenna with the first receiving circuit when it is detected that the power of the radio frequency signal received by the antenna is less than or equal to a preset power threshold, and the first single-pole double-throw switch communicates the antenna with the second receiving circuit when the power detection circuit detects that the power of the radio frequency signal received by the antenna is greater than the preset power threshold. Therefore, in the technical scheme, the power of the radio-frequency signal received by the antenna is detected in time through the power detection circuit, the high-power radio-frequency signal with the detected power larger than the preset power threshold value can be transmitted to the ground, and the high-power radio-frequency signal is prevented from entering other elements of the receiving circuit and a transceiver connected with the receiving circuit, so that the high-power radio-frequency signal is prevented from damaging or destroying all elements in the radio-frequency circuit, and the effect of effectively protecting the radio-frequency circuit in a high-power environment is realized.
In one embodiment, before the power detection circuit detects the power of the rf signal received by the antenna, if the single-pole single-throw switch is connected in parallel with the power coupler, the transceiver may control the low noise amplifier to start operating and control the single-pole single-throw switch to turn off, so that the receiving circuit can operate normally.
In this embodiment, if the single-pole single-throw switch and the power coupler are connected in series, the transceiver can control the low noise amplifier to start operating and control the single-pole single-throw switch to close, so that the receiving circuit can operate normally.
In one embodiment, when the power detection circuit detects the power of the radio frequency signal received by the antenna, a detector in the power detection circuit can receive a coupled radio frequency signal output by the power coupler, output a first voltage corresponding to the coupled radio frequency signal, and send the first voltage to a comparator in the power detection circuit; and generating a second voltage corresponding to the preset power threshold value through a specified voltage source in the power detection circuit, and sending the second voltage to the comparator. Comparing the magnitude relation between the first voltage and the second voltage through a comparator, and outputting a low level through the comparator when the power of the radio-frequency signal received by the antenna is less than or equal to a preset power threshold value under the condition that the first voltage is less than or equal to the second voltage; and under the condition that the first voltage is greater than the second voltage, the power of the radio-frequency signal received by the antenna is greater than a preset power threshold value, and a high level is output through the comparator.
In one embodiment, before the radio frequency signal received by the transceiver is transmitted to the antenna sequentially through the transmitting circuit and the first single-pole double-throw switch, if the single-pole single-throw switch is connected in parallel with the power coupler, the transceiver can control the low-noise amplifier to stop working and control the single-pole single-throw switch to be closed, so that the transmitting circuit can work normally.
In this embodiment, if the single-pole single-throw switch is connected in series with the power coupler, the transceiver can control the low noise amplifier to stop working and control the single-pole single-throw switch to be turned off, so that the transmitting circuit can work normally.
Fig. 6 is a schematic flow chart of a transceiving method of a radio frequency circuit in another embodiment of the present application, which is applied to the radio frequency circuit shown in fig. 2, and as shown in fig. 6, the transceiving method of the radio frequency circuit may include:
s601, judging whether the transceiver works in a mode of transmitting radio frequency signals; if yes, go to S602; if not, go to S604.
And S602, controlling the low noise amplifier to stop working and controlling the single-pole single-throw switch to be closed through the transceiver.
If the transceiving method of the rf circuit shown in fig. 6 is applied to the rf circuit shown in fig. 4, the steps may be executed as follows: the transceiver controls the low noise amplifier to stop working and controls the single-pole single-throw switch to be switched off so as to enable the transmitting circuit to work normally.
S603, the radio frequency signal received by the transceiver is transmitted to the antenna through the transmitting circuit and the first single-pole double-throw switch in sequence.
And S604, controlling the low noise amplifier to start working and controlling the single-pole single-throw switch to be switched off through the transceiver.
If the transceiving method of the rf circuit shown in fig. 6 is applied to the rf circuit shown in fig. 4, the steps may be executed as follows: the transceiver controls the low noise amplifier to start working and controls the single-pole single-throw switch to be closed so as to enable the receiving circuit to work normally.
S605, the power detection circuit detects the power of the rf signal received by the antenna, and then performs S606 or S607.
The detector in the power detection circuit can receive a coupled radio frequency signal output by the power coupler, output a first voltage corresponding to the coupled radio frequency signal and send the first voltage to the comparator in the power detection circuit; and generating a second voltage corresponding to the preset power threshold value through a specified voltage source in the power detection circuit, and sending the second voltage to the comparator. Comparing the magnitude relation between the first voltage and the second voltage through a comparator, and outputting a low level through the comparator when the power of the radio-frequency signal received by the antenna is less than or equal to a preset power threshold value under the condition that the first voltage is less than or equal to the second voltage; and under the condition that the first voltage is greater than the second voltage, the power of the radio-frequency signal received by the antenna is greater than a preset power threshold value, and a high level is output through the comparator.
And S606, when the power detection circuit detects that the power of the radio-frequency signal received by the antenna is smaller than or equal to the preset power threshold, the power detection circuit outputs a low level, the first single-pole double-throw switch is communicated with the antenna and the first receiving circuit, and the radio-frequency signal received by the antenna is transmitted to the transceiver through the first receiving circuit.
S607, when the power detection circuit detects that the power of the radio frequency signal received by the antenna is greater than the preset power threshold, the power detection circuit outputs a high level, the first single-pole double-throw switch communicates the antenna and the second receiving circuit, and the radio frequency signal received by the antenna is transmitted to the ground through the second receiving circuit.
The specific processes of S601-S607 are described in detail in the above embodiments, and are not described again here.
In this embodiment of the application, a power detection circuit is disposed in the radio frequency circuit, the power detection circuit performs power detection on the radio frequency signal received by the antenna, the first single-pole double-throw switch communicates the antenna with the first receiving circuit when it is detected that the power of the radio frequency signal received by the antenna is less than or equal to a preset power threshold, and the first single-pole double-throw switch communicates the antenna with the second receiving circuit when the power detection circuit detects that the power of the radio frequency signal received by the antenna is greater than the preset power threshold. Therefore, in the technical scheme, the power of the radio-frequency signal received by the antenna is detected in time through the power detection circuit, the high-power radio-frequency signal with the detected power larger than the preset power threshold value can be transmitted to the ground, and the high-power radio-frequency signal is prevented from entering other elements of the receiving circuit and a transceiver connected with the receiving circuit, so that the high-power radio-frequency signal is prevented from damaging or destroying all elements in the radio-frequency circuit, and the effect of effectively protecting the radio-frequency circuit in a high-power environment is realized.
Fig. 7 is a schematic structural diagram of an electronic device in an embodiment of the present application. Referring to fig. 7, the electronic device 700 includes the radio frequency circuit 710 provided in any of the embodiments, and the circuit structure of the radio frequency circuit 710 has been described in detail in the embodiments, so that the description is omitted.
In this embodiment of the application, a power detection circuit is disposed in the radio frequency circuit, the power detection circuit performs power detection on the radio frequency signal received by the antenna, the first single-pole double-throw switch communicates the antenna with the first receiving circuit when it is detected that the power of the radio frequency signal received by the antenna is less than or equal to a preset power threshold, and the first single-pole double-throw switch communicates the antenna with the second receiving circuit when the power detection circuit detects that the power of the radio frequency signal received by the antenna is greater than the preset power threshold. Therefore, the power of the radio-frequency signal received by the antenna is timely detected through the power detection circuit in the electronic equipment, the high-power radio-frequency signal with the detected power larger than the preset power threshold value can be transmitted to the ground, the high-power radio-frequency signal is prevented from entering other elements of the receiving circuit and a transceiver connected with the receiving circuit, the high-power radio-frequency signal is prevented from damaging or destroying all elements in the radio-frequency circuit, and the effect of effectively protecting the radio-frequency circuit in a high-power environment is achieved.
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.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A radio frequency circuit is characterized by comprising a transceiver, a transmitting circuit, a first receiving circuit, a second receiving circuit, a first single-pole double-throw switch, a power detection circuit and an antenna; wherein:
one end of the transmitting circuit is connected with the transceiver, and the other end of the transmitting circuit is connected with the first movable end of the first single-pole double-throw switch; one end of the first receiving circuit is connected with the transceiver, and the other end of the first receiving circuit is connected with the first movable end of the first single-pole double-throw switch; the control end of the first single-pole double-throw switch is connected to the antenna through the power detection circuit, and the fixed end of the first single-pole double-throw switch is connected with the antenna; one end of the second receiving circuit is grounded, and the other end of the second receiving circuit is connected with the second movable end of the first single-pole double-throw switch;
the power detection circuit is used for carrying out power detection on the radio-frequency signal received by the antenna;
the first single-pole double-throw switch is communicated with the antenna and the first receiving circuit when the power detection circuit detects that the power of the radio-frequency signal received by the antenna is smaller than or equal to a preset power threshold value; and under the condition that the power detection circuit detects that the power of the radio-frequency signal received by the antenna is greater than the preset power threshold value, the first single-pole double-throw switch is communicated with the antenna and the second receiving circuit.
2. The radio frequency circuit according to claim 1, wherein the power detection circuit comprises a comparator, a detector, and a specified voltage source; wherein the content of the first and second substances,
a first voltage input end of the comparator is connected to the antenna through the detector; a second voltage input end of the comparator is connected with the specified voltage source, and an output end of the comparator is connected with a control end of the first single-pole double-throw switch;
the detector is used for outputting a corresponding first voltage under the condition of receiving a radio frequency signal and sending the first voltage to a first voltage input end of the comparator; the specified voltage source is used for generating a second voltage corresponding to the preset power threshold and sending the second voltage to a second voltage input end of the comparator;
the comparator is used for comparing the magnitude relation between the first voltage and the second voltage; under the condition that the first voltage is less than or equal to the second voltage, the power of a radio-frequency signal received by the antenna is less than or equal to the preset power threshold; and under the condition that the first voltage is greater than the second voltage, the power of the radio-frequency signal received by the antenna is greater than the preset power threshold value.
3. The radio frequency circuit according to claim 2, wherein a single-pole single-throw switch and a power coupler are further connected between the power detection circuit and the antenna; the single-pole single-throw switch and the power coupler are also connected between the stationary end of the first single-pole double-throw switch and the antenna; the single-pole single-throw switch and the power coupler are connected in series or in parallel.
4. The radio frequency circuit according to claim 3, wherein in the case of parallel connection between the single-pole single-throw switch and the power coupler, a first port of the power coupler is connected to the antenna, a coupled port of the power coupler is connected to the detector, and a second port of the power coupler is connected to a stationary terminal of the first single-pole double-throw switch; the single-pole single-throw switch is connected between the first port and the second port in parallel.
5. The RF circuit of claim 4, wherein in the case of a series connection between the SPDT switch and the power coupler, a first port of the power coupler is connected to the antenna, a coupled port of the power coupler is connected to the detector through the SPDT switch, and a second port of the power coupler is connected to a stationary terminal of the first SPDT switch.
6. The radio frequency circuit according to claim 5, wherein the transmitting circuit comprises a driving amplifier, a power amplifier, a second single-pole double-throw switch, a filter and a combiner connected in sequence; the transceiver is connected to the power amplifier through the driving amplifier, the power amplifier is connected with a first movable end of the second single-pole double-throw switch, and a fixed end of the second single-pole double-throw switch is connected with the filter; the combiner is connected with the first movable end of the first single-pole double-throw switch;
the first receiving circuit comprises a low noise amplifier, the second single-pole double-throw switch, the filter and the combiner which are connected in sequence; the enabling end of the transceiver is respectively connected with the enabling end of the low noise amplifier and the enabling end of the single-pole single-throw switch; the transceiver is connected to a second moving end of the second single-pole double-throw switch through the low noise amplifier;
the second receiving circuit comprises a ground resistor; the grounding resistor is used for carrying out impedance matching on the received radio frequency signal.
7. The RF circuit of claim 6, wherein the transceiver is configured to control the low noise amplifier to start operating and the SPST switch to be open or configured to control the low noise amplifier to stop operating and the SPST switch to be closed when the SPST switch and the power coupler are connected in parallel.
8. The RF circuit of claim 6, wherein the transceiver is configured to control the low noise amplifier to start operating and the SPST switch to close or to control the low noise amplifier to stop operating and the SPST switch to open when the SPST switch and the power coupler are connected in series.
9. The radio frequency circuit according to claim 2, wherein a voltage regulator tube is connected in parallel between the output terminal of the comparator and the ground, the voltage regulator tube is broken down when the output voltage of the output terminal of the comparator is greater than a maximum value in a corresponding voltage bearing range of the first single-pole double-throw switch, and the voltage across the broken-down voltage regulator tube is the maximum value.
10. An electronic device comprising a radio frequency circuit as claimed in any one of claims 1 to 9.
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| CN114070337B (en) * | 2021-10-27 | 2023-03-14 | 中国电子科技集团公司第二十九研究所 | Low static noise solid state transmitter and method for reducing static noise |
| CN115759273B (en) * | 2022-11-15 | 2023-12-12 | 本源量子计算科技（合肥）股份有限公司 | Signal processing circuit, quantum control system and quantum computer |
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| US20060035600A1 (en) * | 2004-07-28 | 2006-02-16 | Samsung Electronics Co., Ltd. | RF front-end apparatus in a TDD wireless communication system |
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| CN201393204Y (en) * | 2009-03-13 | 2010-01-27 | 鸿富锦精密工业（深圳）有限公司 | Low-noise amplifier protective circuit and wireless transmit-receive system applying same |
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