CN213782872U - Radio frequency front-end circuit and electronic equipment - Google Patents
Radio frequency front-end circuit and electronic equipment Download PDFInfo
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- CN213782872U CN213782872U CN202022772198.9U CN202022772198U CN213782872U CN 213782872 U CN213782872 U CN 213782872U CN 202022772198 U CN202022772198 U CN 202022772198U CN 213782872 U CN213782872 U CN 213782872U
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Abstract
The application discloses radio frequency front-end circuit and electronic equipment belongs to the electronic circuit field. Wherein, the circuit includes: the device comprises a power amplifier, an electrostatic discharge unit, a first switch, an antenna and a processing unit; the first end of the first switch is connected with the output end of the power amplifier, the second end of the first switch is connected with the input end of the electrostatic discharge unit, and the third end of the first switch is connected with the antenna; the processing unit is connected with the control end of the first switch, and the radio frequency front-end circuit can be switched between a first working state and a second working state under the control of the processing unit; under the condition that the frequency front-end circuit is in a first working state, a first end of a first switch is conducted with a third end of the first switch; and under the condition that the radio frequency front-end circuit is in a second working state, the second end of the first switch is conducted with the third end of the first switch. The circuit can solve the problems that the electrostatic protection capability of an electrostatic protection device in the existing radio frequency front-end circuit is weak, and the insertion loss caused by the weak electrostatic protection capability is large and is not beneficial to signal transmission.
Description
Technical Field
The application belongs to the field of electronic circuits, and particularly relates to a radio frequency front-end circuit and electronic equipment.
Background
At present, mobile phone users carrying mobile phones with them are increasing.
Because the user carries static electricity and the existing mobile phone antenna is in direct contact with the middle frame or the shell of the mobile phone, the static electricity enters the mobile phone antenna under the condition that the user contacts the mobile phone.
In order to avoid that Static electricity of a human body enters the mobile phone antenna and burn down devices in a radio frequency front-end circuit (including an antenna, a radio frequency switch, a power amplifier PA, and the like) where the mobile phone antenna is located, as shown in fig. 1, a capacitor, an inductor, and a ceramic Static discharge (ESD) device are usually disposed on the radio frequency front-end circuit.
However, since the clamping voltage of the ceramic ESD device is too high, this will cause electrostatic leakage, and thus there is a risk of burning out the device in the rf front-end circuit, for example, burning out the power amplifier, i.e., the electrostatic protection capability is poor. Meanwhile, due to the introduction of the capacitor, the inductor and the ceramic ESD device, the insertion loss of the rf front-end circuit is too large, which is not favorable for signal transmission in the rf front-end circuit.
SUMMERY OF THE UTILITY MODEL
An object of the embodiments of the present application is to provide a radio frequency front end circuit and an electronic device, which can solve the problems that an electrostatic protection device provided in the existing radio frequency front end circuit has a weak electrostatic protection capability, and the insertion loss caused by the weak electrostatic protection capability is large and is not favorable for signal transmission.
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 front-end circuit, including: the device comprises a power amplifier, an electrostatic discharge unit, a first switch, an antenna and a processing unit;
the first switch comprises a first end, a second end and a third end, the first end of the first switch is connected with the output end of the power amplifier, the second end of the first switch is connected with the input end of the electrostatic discharge unit, and the third end of the first switch is connected with the antenna;
the processing unit is connected with the control end of the first switch, and the radio frequency front-end circuit can be switched between a first working state and a second working state under the control of the processing unit; under the condition that the frequency front-end circuit is in the first working state, the first end of the first switch is conducted with the third end of the first switch; and under the condition that the radio frequency front-end circuit is in the second working state, the second end of the first switch is conducted with the third end of the first switch.
In a second aspect, an embodiment of the present application provides an electronic device, where the electronic device includes the radio frequency front-end circuit in the first aspect.
In an embodiment of the present application, there is provided a radio frequency front end circuit, including: the antenna comprises a power amplifier, an electrostatic discharge unit, a first switch, an antenna and a processing unit, wherein the first end of the first switch is connected with the output end of the power amplifier, the second end of the first switch is connected with the input end of the electrostatic discharge unit, and the third end of the first switch is connected with the antenna; the processing unit is connected with the control end of the first switch, and the radio frequency front-end circuit can be switched between a first working state and a second working state under the control of the processing unit; under the condition that the radio frequency front-end circuit is in a first working state, a first end of the first switch is conducted with a third end of the first switch; and under the condition that the radio frequency front-end circuit is in a second working state, the second end of the first switch is conducted with the third end of the first switch. Therefore, the radio frequency front-end circuit determines that the radio frequency front-end circuit is in the second working state under the condition that the distance between the object and the radio frequency front-end circuit is detected to be in the preset range for the first time. At this time, the processing unit controls the second end of the first switch to be conducted with the third end of the first switch, the circuits among the antenna, the first switch, the static electricity leakage unit and the ground in the radio frequency front-end circuit are conducted, and static electricity in the antenna is greatly or completely leaked by the static electricity leakage unit. And then, after a preset time period corresponding to the second working state, determining that the radio frequency front-end circuit is switched from the second working state to the first working state. At this time, the signal path of the rf front-end circuit: the circuits among the antenna, the first switch and the power amplifier are conducted, normal communication can be carried out, no or only a small amount of residual static electricity enters a signal path of the radio frequency front-end circuit, and devices in the signal path of the radio frequency front-end circuit cannot be damaged. Therefore, the electrostatic protection capability of the embodiment of the application is strong. Meanwhile, because the electrostatic discharge unit and the signal path of the rf front-end circuit belong to a parallel relationship, no insertion loss is caused to the signal path of the rf front-end circuit, which means that the signal transmission of the signal path of the rf front-end circuit is not affected.
Drawings
Fig. 1 is a schematic structural diagram of a conventional rf front-end circuit;
fig. 2 is a first schematic structural diagram of an rf front-end circuit according to an embodiment of the present disclosure;
fig. 3 is a time domain waveform diagram of electrostatic discharge provided by an embodiment of the present application;
fig. 4 is a schematic structural diagram of a radio frequency front-end circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a radio frequency front-end circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a radio frequency front-end circuit according to an embodiment of the present disclosure;
fig. 7 is a frequency domain waveform diagram of electrostatic discharge according to an embodiment of the present disclosure.
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 front-end circuit and the electronic device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings by specific embodiments and application scenarios thereof.
As shown in fig. 2, an embodiment of the present application provides an rf front-end circuit, including: a first switch 201, an antenna 202, a power amplifier 205, an electrostatic discharge unit 204 and a processing unit 206. Wherein:
the first switch 201 includes a first terminal, a second terminal and a third terminal, the first terminal of the first switch 201 is connected to the output terminal of the power amplifier 205, the second terminal of the first switch 201 is connected to the input terminal of the electrostatic discharge unit 204, and the third terminal of the first switch 201 is connected to the antenna 202.
The processing unit 206 is connected to the control terminal of the first switch 201, and under the control of the processing unit 206, the rf front-end circuit can be switched between a first operating state and a second operating state; under the condition that the frequency front-end circuit is in a first working state, a first end of the first switch 201 is conducted with a third end of the first switch 201; under the condition that the rf front-end circuit is in the second working state, the second terminal of the first switch 201 is conducted with the third terminal of the first switch 201.
In this embodiment, the first operating state refers to a normal communication state in which the rf front-end circuit is in a non-electrostatic discharge state. The second working state refers to that the radio frequency front-end circuit is in a static electricity discharge state.
And the processing unit 206 determines the operating state of the rf front-end circuit within a preset time period from the start time as the second operating state. The starting time refers to a time when the distance between the radio frequency front end circuit and the object is detected to be within a preset distance range for the first time.
Correspondingly, the processing unit 206 determines the working state of the rf front-end circuit after the second working state corresponds to the time period as the first working state.
In the embodiment of the present application, the preset distance range is a distance range indicating that an object approaches the rf front-end circuit and tends to contact the rf front-end circuit. Illustratively, the predetermined distance range may be within 1 cm. It should be noted that the preset distance range may be set empirically, and is not limited in the embodiment of the present application.
In the embodiment of the present application, the preset time period is a time period from a static electricity leakage starting time to a time when the static electricity leakage current is greatly reduced or is 0. As shown in fig. 3, the preset time period may be 60 ns. In fig. 3, the abscissa represents time t and the ordinate represents electrostatic current I.
On the basis of the above, under the condition that the rf front-end circuit is in the second working state, the processing unit 206 controls the second terminal of the first switch 201 to be conducted with the third terminal of the first switch 201, specifically, the processing unit 206 controls the second terminal of the first switch 201 to be conducted with the third terminal of the first switch 201 within a preset time period. In this case, the circuit among the antenna 202, the first switch 201, the static electricity leakage unit 204, and the ground in the rf front-end circuit is turned on, and the static electricity in the antenna 202 is greatly or completely leaked by the static electricity leakage unit 204.
Note that, in the case where an object touches the rf front-end circuit, there is a possibility that static electricity carried by the object itself enters the antenna 202 in the rf front-end circuit. Therefore, under the condition that an object is determined to be close to the radio frequency front end circuit and the trend of contacting the radio frequency front end circuit exists, electrostatic discharge is performed, and devices in the radio frequency front end circuit can be prevented from being burnt.
When the rf front-end circuit is switched from the second operating state to the first operating state, the processing unit 206 controls the first terminal of the first switch 201 to be conducted with the third terminal of the first switch 201. At this time, no or only a small amount of residual static electricity enters the signal path of the rf front-end circuit, which does not damage devices in the signal path of the rf front-end circuit. Meanwhile, the signal path of the rf front-end circuit (the circuit among the antenna 202, the first switch 201, and the power amplifier 204) is turned on, and normal communication can be performed.
It should be noted that, because the time length corresponding to the preset time period is short, the rf front-end circuit cannot communicate only in a short time (usually in milliseconds), and this has a negligible effect on the communication capability of the rf front-end circuit.
In one test example, the time from the beginning of preparing to touch the mobile phone to the touch of the mobile phone is about 40-80 ms when the hand of the user is within 1 cm. On the basis, the preset time period is set to be 60ns, and the signal variation time of the radio frequency front-end circuit of the mobile phone is 10-200 ms after testing.
In an embodiment of the present application, there is provided a radio frequency front end circuit, including: the antenna comprises a power amplifier, an electrostatic discharge unit, a first switch, an antenna and a processing unit, wherein the first end of the first switch is connected with the output end of the power amplifier, the second end of the first switch is connected with the input end of the electrostatic discharge unit, and the third end of the first switch is connected with the antenna; the processing unit is connected with the control end of the first switch, and the radio frequency front-end circuit can be switched between a first working state and a second working state under the control of the processing unit; under the condition that the radio frequency front-end circuit is in a first working state, a first end of the first switch is conducted with a third end of the first switch; and under the condition that the radio frequency front-end circuit is in a second working state, the second end of the first switch is conducted with the third end of the first switch. Therefore, the radio frequency front-end circuit determines that the radio frequency front-end circuit is in the second working state under the condition that the distance between the object and the radio frequency front-end circuit is detected to be in the preset range for the first time. At this time, the processing unit controls the second end of the first switch to be conducted with the third end of the first switch, the circuits among the antenna, the first switch, the static electricity leakage unit and the ground in the radio frequency front-end circuit are conducted, and static electricity in the antenna is greatly or completely leaked by the static electricity leakage unit. And then, after a preset time period corresponding to the second working state, determining that the radio frequency front-end circuit is switched from the second working state to the first working state. At this time, the signal path of the rf front-end circuit: the circuits among the antenna, the first switch and the power amplifier are conducted, normal communication can be carried out, no or only a small amount of residual static electricity enters a signal path of the radio frequency front-end circuit, and devices in the signal path of the radio frequency front-end circuit cannot be damaged. Therefore, the electrostatic protection capability of the embodiment of the application is strong. Meanwhile, because the electrostatic discharge unit and the signal path of the rf front-end circuit belong to a parallel relationship, no insertion loss is caused to the signal path of the rf front-end circuit, which means that the signal transmission of the signal path of the rf front-end circuit is not affected.
In one embodiment, as shown in fig. 4, the rf front-end circuit provided in the embodiment of the present application further includes an rf switch 203. The output of the power amplifier 205 is connected to a first terminal of the first switch 201 via the rf switch 203.
In the embodiment of the present application, the rf switch 203 is a single-pole multi-throw switch. The processing unit 206 detects a frequency band of a network system corresponding to the rf front-end circuit, and controls a connection state of the rf switch 203. Based on this, it can be understood that the control terminal of the rf switch 203 is connected to an output terminal of the processing unit 206.
In one embodiment, as shown in fig. 4, the rf front-end circuit provided in the embodiment further includes a ranging unit 207. The ranging unit 207 is connected to the processing unit 206.
In the embodiment of the present application, the distance measuring unit 207 is configured to detect a distance between the rf front-end circuit and the object, and input the distance to the processing unit 206, so that the processor 206 determines whether the rf front-end circuit is in the second operating state.
In an embodiment of the present application, the ranging unit 207 may be: at least one of an infrared distance sensor, a laser focus distance sensor, and an electromagnetic wave absorption ratio sensor.
In the embodiment of the present application, the electromagnetic wave absorption ratio sensor may generate a parasitic capacitance when detecting that a human body approaches the rf front-end circuit. When the distance between the human body and the radio frequency front end circuit changes, the capacitance value of the parasitic capacitor also changes. Based on this, the electromagnetic wave absorption ratio sensor may output a capacitance value reflecting the distance between the radio frequency front end circuit and the physical to the processing unit 206. On the basis of this, the processing unit 206 determines the distance between the radio frequency front end circuit and the object based on the capacitance value output by the electromagnetic wave absorption ratio sensor.
In an embodiment of the present application, taking the rf front-end circuit as an rf front-end circuit in a mobile phone as an example, the infrared distance sensor may be a front-mounted infrared distance sensor. For example, in a case where the face of the user is close to the mobile phone, the front infrared distance sensor may detect a distance between the radio frequency front end circuit in the mobile phone and the face of the user.
In an embodiment of the present application, taking an rf front-end circuit as an rf front-end circuit in a mobile phone as an example, the laser focus distance sensor may be a rear CCM laser focus distance sensor. The rear CCM laser focusing distance sensor detects the distance between a radio frequency front-end circuit and an object in the mobile phone by transmitting and receiving laser signals.
It should be noted that the distance measurement unit 207 may also be a distance measurement unit in other forms, which is not limited in this embodiment.
Based on the above, in an embodiment of the present application, in order to reduce the power consumption of the rf front-end circuit, the processing unit 206 may monitor its own status, and turn on the distance measuring unit 207 when it is determined that there is a tendency that an object is about to contact the rf front-end circuit. For example, taking the rf front-end circuit as an rf front-end circuit in a mobile phone, the processing unit 206 starts the ranging unit 207 when the traffic transmission and the incoming call of the mobile phone are detected by the processing unit.
In one embodiment, as shown in fig. 4, the esd unit 204 includes a first resistor 2041, a first end of the first resistor 2041 is grounded, and a second end of the first resistor 2041 is connected to the second end of the first switch 201.
In the embodiment of the present application, the first resistor 2041 may be used to attenuate static electricity, and then the residual static electricity is switched on to achieve complete discharge.
In one embodiment, the esd unit 204 comprises a transient diode, a cathode of the transient diode is connected to the second terminal of the first switch 201, and an anode of the transient diode is grounded.
In the embodiment of the application, the transient diode is used for realizing electrostatic discharge. The transient diode has small volume and is convenient to integrate.
In one embodiment, as shown in fig. 5, the rf front-end circuit provided in the embodiment of the present application further includes a second switch 208. The esd unit 204 includes a capacitor 2042 and an inductor 2043. Wherein:
the second switch 208 includes a first terminal, a second terminal, and a third terminal, the first terminal of the second switch 208 is connected to the third terminal of the first switch 201, the second terminal of the second switch 208 is connected to the first terminal of the capacitor 2042, and the third terminal of the second switch 208 is connected to the output terminal of the power amplifier 205.
A second terminal of the capacitor 2042 is connected to the third terminal of the first switch 201.
A first end of the inductor 2043 is connected to the second end of the capacitor 2042, and a second end of the inductor 2043 is grounded.
The processing unit 206 is connected to the control terminal of the second switch 208, and when the rf front-end circuit is in the first working state, the first terminal of the second switch 208 is connected to the third terminal of the second switch 208; in the second operating state of the rf front-end circuit, the second terminal of the second switch 208 is connected to the third terminal of the second switch 208.
It should be noted that fig. 5 illustrates an rf front-end circuit including an rf switch 203. On this basis, the third terminal of the second switch 208 is connected to the output terminal of the power amplifier 205 through the rf switch 203.
In the embodiment of the present application, the esd unit 204 is implemented by a capacitor 2042 and an inductor 2043, which can enhance esd capability.
In an embodiment, as shown in fig. 6, the electrostatic discharge unit provided in the embodiment of the present application further includes a second resistor 2044, and in the embodiment of the present application, the second terminal of the capacitor 2042 is connected to the third terminal of the first switch 201 through the second resistor 2044.
In the embodiment of the present application, the electrostatic discharge unit 204 is implemented by the capacitor 2042, the inductor 2043 and the second resistor 2044, and the second resistor 2044 attenuates static electricity first, and then the capacitor 2042 and the inductor 2043 further discharge static electricity, so that the electrostatic discharge capability can be further enhanced.
In one embodiment, as shown in fig. 6, the rf front-end circuit provided in the embodiment of the present application further includes a test socket 209. Test socket 209 is disposed between the first terminal of first switch 201 and rf switch 203.
In the embodiment of the present application, the test socket 209 disposed between the first switch 201 and the rf switch 203 allows a technician to test the performance of the path between the power amplifier 205 and the rf switch 203 and the performance of the antenna 201, which improves the intelligence of the rf front-end circuit provided in the embodiment of the present application.
In one embodiment, as shown in fig. 6, the rf front-end circuit provided in this embodiment of the application further includes an antenna tuner 210, a first terminal of the antenna tuner 210 is connected to the antenna 202, a second terminal of the antenna tuner 210 is connected to ground, and a control terminal of the antenna tuner is connected to the processing unit 206.
In the embodiment of the present application, as shown in fig. 7, it is known that the energy of static electricity is concentrated in the vicinity of zero frequency and low frequency below 50 MHz. In fig. 7, the abscissa represents frequency and the ordinate represents energy. Based on this, the processing unit 206 controls the first switch 201, or controls the first switch 201 and the second switch 208, and also controls the antenna tuner 210 to perform tuning, so that the antenna tuner 210 is tuned to a state where zero-frequency performance insertion is particularly large. In this way, preliminary suppression of static electricity can be achieved by the antenna tuner 210. On the basis, the electrostatic discharge capacity can be further improved by combining the first switch 201 or combining the control of the first switch and the second switch 208.
An embodiment of the present application further provides an electronic device, where the electronic device includes the radio frequency front-end circuit in any of the above embodiments.
In the embodiment of the present application, the electronic device may be, for example, a mobile phone, a tablet computer, a notebook computer, and the like.
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 front end circuit, comprising: the device comprises a power amplifier, an electrostatic discharge unit, a first switch, an antenna and a processing unit;
the first switch comprises a first end, a second end and a third end, the first end of the first switch is connected with the output end of the power amplifier, the second end of the first switch is connected with the input end of the electrostatic discharge unit, and the third end of the first switch is connected with the antenna;
the processing unit is connected with the control end of the first switch, and the radio frequency front-end circuit can be switched between a first working state and a second working state under the control of the processing unit; under the condition that the frequency front-end circuit is in the first working state, the first end of the first switch is conducted with the third end of the first switch; and under the condition that the radio frequency front-end circuit is in the second working state, the second end of the first switch is conducted with the third end of the first switch.
2. The circuit of claim 1, wherein the rf front-end circuit further comprises an rf switch, and wherein the output of the power amplifier is coupled to the first terminal of the first switch via the rf switch.
3. The circuit of claim 1, wherein the electrostatic discharge unit comprises a first resistor, a first end of the first resistor is grounded, and a second end of the first resistor is connected to the second end of the first switch.
4. The circuit of claim 1, wherein the electrostatic discharge unit comprises a transient diode, a cathode of the transient diode is connected to the second terminal of the first switch, and an anode of the transient diode is grounded.
5. The circuit of claim 1, wherein the rf front-end circuit further comprises a second switch, and wherein the electrostatic discharge unit comprises: a capacitor and an inductor;
the second switch comprises a first end, a second end and a third end, the first end of the second switch is connected with the third end of the first switch, the second end of the second switch is connected with the first end of the capacitor, and the third end of the second switch is connected with the output end of the power amplifier;
the second end of the capacitor is connected with the third end of the first switch;
the first end of the inductor is connected with the second end of the capacitor, and the second end of the inductor is grounded;
the processing unit is connected with the control end of the second switch, and the first end of the second switch is conducted with the third end of the second switch under the condition that the radio frequency front-end circuit is in the first working state; and under the condition that the radio frequency front-end circuit is in the second working state, the second end of the second switch is connected with the third end of the second switch.
6. The circuit of claim 5, wherein the electrostatic discharge unit further comprises a second resistor, and the second terminal of the capacitor is connected to the third terminal of the first switch through the second resistor.
7. The circuit of claim 1, wherein the rf front-end circuit further comprises: and the distance measuring unit is connected with the processing unit.
8. The circuit of claim 7, wherein the ranging unit comprises: at least one of an infrared distance sensor, a laser focus distance sensor, and an electromagnetic wave absorption ratio sensor.
9. The circuit of claim 1, wherein the radio frequency circuit further comprises an antenna tuner, a first terminal of the antenna tuner is connected to the antenna, a second terminal of the antenna tuner is connected to ground, and a control terminal of the antenna tuner is connected to the processing unit.
10. An electronic device, characterized in that the electronic device comprises a radio frequency front end circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022772198.9U CN213782872U (en) | 2020-11-25 | 2020-11-25 | Radio frequency front-end circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022772198.9U CN213782872U (en) | 2020-11-25 | 2020-11-25 | Radio frequency front-end circuit and electronic equipment |
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| CN213782872U true CN213782872U (en) | 2021-07-23 |
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| CN202022772198.9U Active CN213782872U (en) | 2020-11-25 | 2020-11-25 | Radio frequency front-end circuit and electronic equipment |
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