CN107809506B - Anti-interference circuit structure and mobile terminal - Google Patents

Abstract

The invention discloses an anti-interference circuit structure and a mobile terminal. The immunity circuit structure includes an antenna and a proximity sensor. The antenna is used for emitting radiation signals outwards. The proximity sensor includes an emitter and a receiver connected to each other, the emitter for emitting a detection signal, and the receiver for receiving the detection signal reflected back. The anti-interference circuit structure further comprises a filter capacitor, one end of the filter capacitor is connected between the transmitter and the receiver, the other end of the filter capacitor is grounded, and the filter capacitor is used for filtering interference of radiation signals to the transmitter. Because the filter capacitor can filter the interference of the radiation signal to the emitter, the emission intensity of the emitter is easy to control, and the working reliability of the proximity sensor is high.

Description

Anti-jamming circuit structure and mobile terminal

technical field

The present invention relates to the technical field of electronic equipment, and more particularly, to an anti-interference circuit structure and a mobile terminal.

Background technique

At present, mobile phones are developing in the direction of narrow frame and large screen ratio. With the continuous expansion of screen ratio, the functional devices of mobile phones are arranged more closely, such as proximity sensors and antennas. Proximity sensors may be arranged in the clearance area of the antenna. In this case, the proximity sensor is susceptible to interference from antenna radiation and has poor reliability.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide an anti-interference circuit structure and a mobile terminal.

The anti-jamming circuit structure of the embodiment of the present invention includes an antenna and a proximity sensor, the antenna is used to transmit radiation signals to the outside, the proximity sensor includes a transmitter and a receiver connected to each other, the transmitter is used for transmitting detection signals, so The receiver is used to receive the reflected detection signal, and the anti-jamming circuit structure further includes a filter capacitor, one end of the filter capacitor is connected between the transmitter and the receiver, and the other end is grounded. The filter capacitor is used to filter out the interference of the radiation signal to the transmitter.

In some embodiments, the filter capacitance is greater than or equal to 0.1 microfarads.

In some embodiments, one end of the transmitter is connected to the receiver, and the other end is connected to the power supply of the transmitter. The anti-jamming circuit structure further includes a bypass capacitor, and one end of the bypass capacitor is connected to the power supply of the transmitter. Between the transmitter and the transmitter power supply, the other end is grounded.

In some embodiments, the anti-interference circuit structure further includes:

a processor connected to the receiver via an I2C bus; and

A filter module, the filter module is connected to the I2C bus, and the filter module is used to filter out the interference of the radiation signal to the I2C bus.

In some embodiments, the I2C bus includes a data line and a clock line, the data line is used for transmitting a data signal, the clock line is used for transmitting a clock signal, and the filtering module includes a data filtering circuit and a clock filtering circuit , the data filter circuit is connected to the data line and used to filter the interference of the radiation signal to the data signal, the clock filter circuit is connected to the clock line and used to filter out all The radiation signal interferes with the clock signal.

In some embodiments, the receiver includes a data terminal, the data filtering circuit includes a data inductor, the data inductor is connected in series with the data line, and the data inductor is connected to the processing unit through one end of the data line. connector, and the other end is connected to the data terminal.

In some embodiments, the data filtering circuit further includes a data capacitor connected to the data line, the data capacitor is connected between the processor and the data inductor, and one end of the data capacitor is connected to the data capacitor. The data line is connected, and the other end is grounded.

In some embodiments, the receiver includes a clock terminal, the clock line filter circuit includes a clock inductor, the clock inductor is connected in series with the clock line, and the clock inductor is connected to the clock line through one end of the clock line. The processor is connected, and the other end is connected to the clock terminal.

In some embodiments, the clock filter circuit further includes a clock capacitor connected to the clock line, the clock capacitor is connected between the processor and the clock inductor, and one end of the clock capacitor is connected to the clock capacitor. The clock line is connected, and the other end is grounded.

The mobile terminal of the embodiment of the present invention includes:

a circuit board comprising a top layer, a bottom layer, and at least one intermediate layer, the top layer facing away from the bottom layer, the intermediate layer being located between the top layer and the bottom layer; and

In the anti-jamming circuit structure according to any one of the above embodiments, the antenna is connected to the bottom layer, and the transmitter is connected to the top layer;

The intermediate layer includes a ground layer, and the ground layer is formed with a shielding area covered by a conductive material, and the shielding area corresponds to the position of the transmitter.

In some embodiments, the middle layer further includes a wiring layer, the wiring layer is located between the ground layer and the top layer, and the transmitter passes through the top layer to communicate with the wiring layer electrical connection.

In some embodiments, the ground layer and the top layer are separated by only one of the routing layers.

In some embodiments, the intermediate layer further includes at least one connecting layer between the bottom layer and the ground layer, and a region of the connecting layer corresponding to the shielding area is made of insulating material.

In the anti-interference circuit structure and the mobile terminal of the embodiment of the present invention, the filter capacitor can filter the interference of the radiated signal to the transmitter, the emission intensity of the transmitter is easy to control, and the working reliability of the proximity sensor is high.

Additional aspects and advantages of embodiments of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or learned by practice of embodiments of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a schematic plan view of a mobile terminal according to an embodiment of the present invention;

2 is a schematic exploded perspective view of a mobile terminal according to an embodiment of the present invention;

3 is a schematic block diagram of an anti-interference circuit structure according to an embodiment of the present invention;

4 is a schematic diagram of a circuit structure of an anti-interference circuit structure according to an embodiment of the present invention;

5 is a schematic diagram of a circuit structure of an anti-interference circuit structure according to another embodiment of the present invention;

6 is a schematic structural diagram of a circuit board according to an embodiment of the present invention;

7 is a schematic plan view of a top layer of a circuit board according to an embodiment of the present invention;

8 is a schematic plan view of a wiring layer of a circuit board according to an embodiment of the present invention;

9 is a schematic plan view of a ground layer of a circuit board according to an embodiment of the present invention;

10 is a schematic plan view of a connection layer of a circuit board according to an embodiment of the present invention.

Description of main component symbols:

Mobile terminal 100, anti-jamming circuit structure 10, antenna 11, proximity sensor 12, transmitter 122, receiver 124, power terminal VDD, ground terminal GND, transmitter connection terminal LEDA, data terminal SDA, clock terminal SCL, interrupt terminal INT , receiver power supply V1, transmitter power supply V2, pull-up power supply V3, processor 13, filter module 14, data filter circuit 141, data inductor 1411, data capacitor 1412, clock filter circuit 142, clock inductor 1421, clock capacitor 1422, Interrupt filter circuit 143, interrupt inductor 1431, interrupt capacitor 1432, filter capacitor 15, ground capacitor 16, I2C bus 17, data line 171, clock line 172, interrupt line 18, pull-up resistor 19, bypass capacitor 1a, circuit board 20. Top layer 21, fixed pad 211, middle layer 22, wiring layer 221, connection line 2211, connection pad 2212, ground layer 222, shielding area 2221, connection layer 223, bottom layer 23, shell 30, front surface 32, Back 34 , top 36 , bottom 38 , display screen 40 , elastic sheet 50 .

Detailed ways

The embodiments of the present invention will be further described below with reference to the accompanying drawings. The same or similar reference numbers refer to the same or similar elements or elements having the same or similar functions throughout the drawings.

In addition, the embodiments of the present invention described below in conjunction with the accompanying drawings are exemplary, and are only used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

Referring to FIG. 1 and FIG. 2 , the mobile terminal 100 according to the embodiment of the present invention includes an anti-jamming circuit structure 10 and a circuit board 20 . The mobile terminal 100 can be a mobile phone, a watch, a head-mounted display device, a notebook computer, a tablet computer, etc. The embodiments of the present invention are described by taking the mobile terminal 100 as a mobile phone as an example, and it can be understood that the specific form of the mobile terminal 100 can be other. The mobile terminal 100 may further include a casing 30 , and the anti-jamming circuit structure 10 and the circuit board 20 are accommodated in the casing 30 , and the casing 30 can be used to provide waterproof, dust-proof, and drop-proof for the anti-jamming circuit structure 10 and the circuit board 20 . etc. protection. The housing 30 includes a front surface 32 and a back surface 34 opposite to each other, the front surface 32 and the back surface 34 can be connected by a top 36 and a bottom 38 , and the display screen 40 of the mobile terminal 100 can be arranged on the front surface 32 .

Please refer to FIG. 3 and FIG. 4 , the anti-jamming circuit structure 10 includes an antenna 11 , a proximity sensor 12 , a processor 13 , a filter module 14 and a filter capacitor 15 . The anti-interference circuit structure 10 is arranged on the circuit board 20 .

Please refer to FIG. 2 , the types of the antenna 11 can be a main antenna, a diversity antenna, a wifi antenna, an NFC antenna, etc. The antenna 11 is connected to the circuit board 20 , and the antenna 11 can transmit radiation signals or receive radiation signals from the outside to make the mobile The terminal 100 communicates with the outside world. Specifically, the antenna 11 can be connected to the circuit board 20 through the elastic sheet 50 , one end of the elastic sheet 50 is fixedly connected to the circuit board 20 , and the other end of the elastic sheet 50 can be in contact with the antenna 11 to the feed point. In this embodiment of the present invention, the antenna 11 may be fixed on the casing 30 , specifically, the antenna 11 may be fixed on the top 36 of the casing 30 to reduce the blocking effect of other parts of the mobile terminal 100 on the radiated signal of the antenna 11 .

Referring to FIGS. 1 and 2 , the proximity sensor 12 includes a transmitter 122 and a receiver 124 . The proximity sensor 12 can also be disposed near the top 36 , so that the proximity sensor 12 and the antenna 11 are arranged more compactly, which saves the space available for arranging the display screen 40 and increases the screen ratio of the mobile terminal 100 . The proximity sensor 12 can be used to determine the distance between the front surface 32 of the housing 30 and external obstacles. For example, when the proximity sensor 12 detects that the distance is less than a preset distance, it is determined that the user may be answering a call, and the mobile terminal 100 is triggered. Screen off operation. Specifically, the transmitter 122 can emit detection waves from the front surface 32, and the detection waves are reflected by external obstacles during the propagation process, and the receiver 124 receives the detection waves reflected by the outside world, and further processes the reflected detection waves by processing. The strength of , judge the distance between the front 32 and the external obstacles. It can be understood that the transmitter 122 is connected with the receiver 124 so that the receiver 124 can easily obtain the information of the detected waves transmitted by the transmitter 122 . For example, the receiver 124 can obtain the time information when the transmitter 122 transmits the detection wave, and the receiver 124 can start to detect the reflected detection wave only after the transmitter 122 transmits the detection wave; the receiver 124 can obtain the detection wave transmitted by the transmitter 122 The intensity information of the wave is compared with the intensity information of the detected wave that is reflected back. Referring to FIG. 4, one end of the transmitter 122 is connected to the receiver 124, and the other end is connected to the transmitter power supply V2. The transmitter power supply V2 is used to provide power to the transmitter 122. Preferably, the anti-jamming circuit structure 10 further includes a side One end of the bypass capacitor 1a is connected between the transmitter 122 and the transmitter power supply V2, and the other end is grounded. The bypass capacitor 1a can be used to filter out high frequency interference in the transmitter power supply V2.

The transmitter 122 can be an infrared light transmitter 122 for emitting infrared light outward; the transmitter 122 can also be an ultrasonic transmitter 122 for emitting ultrasonic waves; the transmitter 122 can also be a laser transmitter 122 for Fire the laser outward. Correspondingly, the receiver 124 may also be an infrared light receiver, an ultrasonic receiver, a laser receiver, or the like. The present invention is described by taking the transmitter 122 as an infrared LED lamp as an example. The infrared LED lamp can emit infrared light under the driving of electric energy, and the receiver 124 is an infrared light receiver.

Referring to FIGS. 3 and 4 , the receiver 124 includes a power terminal VDD, a ground terminal GND, a transmitter connection terminal LEDA, a data terminal SDA, a clock terminal SCL, and an interrupt terminal INT. The power supply terminal VDD is used to connect the external receiver power supply V1, and the receiver power supply V1 is used to provide power to the receiver 124. Preferably, a grounding capacitor 16 can be connected between the receiver power supply V1 and the power supply terminal VDD. The grounding capacitor 16 One end is connected between the receiver power supply V1 and the power supply terminal VDD, and the other end is grounded. The grounding capacitor 16 can be used to filter out high-frequency interference in the receiver power supply V1. The ground terminal GND is used to connect the receiver 124 to the ground for defining a low level and for preventing the influence of external static electricity. The transmitter connection terminal LEDA is used to connect with the transmitter 122 , and the information of the detection wave emitted by the transmitter 122 can be transmitted to the receiver 124 through the transmitter connection terminal LEDA. The data terminal SDA can be used to connect the receiver 124 and the processor 13 to realize data signal transmission between the receiver 124 and the processor 13 . The clock terminal SCL can be used to connect the receiver 124 and the processor 13 to realize clock signal transmission between the receiver 124 and the processor 13 . The interrupt terminal INT can be used to connect the receiver 124 and the processor 13 to realize the interrupt signal transmission between the receiver 124 and the processor 13 .

Referring to FIGS. 3 and 4 , the processor 13 is connected to the proximity sensor 12 . The processor 13 may be communicatively connected with the receiver 124 to receive the intensity information of the reflected detection wave acquired by the receiver 124, and further process the intensity information to obtain the distance between the front surface 32 of the housing 30 and external obstacles. Specifically, the processor 13 is connected with the receiver 124 of the proximity sensor 12 , and more specifically, the processor 13 is connected with the receiver 124 through the I2C bus 17 and the interrupt line 18 . The I2C bus 17 includes a data line 171 and a clock line 172 . The data line 171 connects the data terminal SDA and the processor 13, and is used for transmitting data signals; the clock line 172 connects the clock terminal and the processor 13, and is used for transmitting the clock signal. The interrupt line 18 connects the interrupt terminal INT and the processor 13, and is used for transmitting an interrupt signal.

Please refer to FIG. 2 to FIG. 4 , it can be understood that in order to make the antenna 11 and the proximity sensor 12 more compact, the proximity sensor 12 may be located in the clearance area of the antenna 11, and in the clearance area of the antenna 11, the proximity sensor 12 is easy to interfered with by the radiated signal emitted by the antenna 11 . Taking the interference of the I2C bus 17 as an example, the radiation signal may change the waveform of the signal transmitted on the I2C bus 17, causing the processor 13 to receive incorrect information, and may also cause the related modules of the processor 13 to crash, causing the entire I2C bus. All functional devices connected to the bus 17 are disabled. Therefore, the filter module 14 needs to be designed in the anti-interference circuit structure 10 . The filtering module 14 can be used to filter the interference of the radiation signal transmitted by the antenna 11 to the I2C bus 17 , and the filtering module 14 can also be used to filter the interference of the radiation signal transmitted by the antenna 11 to the interruption signal transmitted by the interruption line 18 . Specifically, the filtering module 14 includes a data filtering circuit 141 , a clock filtering circuit 142 and an interrupt filtering circuit 143 .

The data filtering circuit 141 is connected to the data line 171 and is used for filtering the interference of the radiation signal to the data signal. The data filter circuit 141 includes a data inductor 1411 , and the data inductor 1411 is connected to the data line 171 in series. One end of the data inductor 1411 is connected to the processor 13 through the data line 171, and the other end is connected to the data terminal SDA. When the high-frequency radiation signal interferes with the data line 171, causing a high-frequency abrupt current in the data line 171, the data inductor 1411 can suppress the high-frequency abrupt current, so as to filter out the interference caused by the radiation signal to the data signal. The data inductor 1411 may be greater than or equal to 15 nanohenry, such as 15 nanohenry, 100 nanohenry, 177 nanohenry, 2000 nanohenry, etc., so that the data inductor 1411 has a better suppression effect on high-frequency abrupt current. Referring to FIG. 5 , in one example, the data filter circuit 141 may further include a data capacitor 1412, which is connected to the data line 171. Specifically, the data capacitor 1412 is connected between the processor 13 and the data inductor 1411. One end of 1412 is connected to the data line 171, and the other end is grounded. The data capacitor 1412 can be used to improve the waveform quality of the data signal sent from the processor 13 to the data terminal SDA. Of course, the data filter circuit 141 may not include the data capacitor 1412 .

The clock filter circuit 142 is connected to the clock line 172 and is used for filtering the interference of the radiation signal to the clock signal. The clock filter circuit 142 includes a clock inductor 1421 , and the clock inductor 1421 is connected to the clock line 172 in series. One end of the clock inductor 1421 is connected to the processor 13 through the clock line 172, and the other end is connected to the clock terminal SCL. When a high frequency radiation signal interferes with the clock line 172, so that a high frequency sudden change current is generated in the clock line 172, the clock inductor 1421 can suppress the high frequency sudden change current, so as to filter out the interference caused by the radiation signal to the clock signal. The clock inductance 1421 may be greater than or equal to 15 nanohenry, such as 15 nanohenry, 100 nanohenry, 500 nanohenry, 1000 nanohenry, etc., so that the clock inductance 1421 has a better suppression effect on high-frequency abrupt current. Referring to FIG. 5 , in an example, the clock filter circuit 142 may further include a clock capacitor 1422, which is connected to the clock line 172. Specifically, the clock capacitor 1422 is connected between the processor 13 and the clock inductor 1421. One end of 1422 is connected to the clock line 172, and the other end is grounded. The clock capacitor 1422 can be used to improve the waveform quality of the clock signal sent from the processor 13 to the clock terminal SCL. Of course, the clock filter circuit 142 may not include the clock capacitor 1422 .

The interruption filter circuit 143 is connected to the interruption line 18 and is used for filtering the interference of the radiation signal to the interruption signal. The interruption filter circuit 143 includes an interruption inductance 1431 , and the interruption inductance 1431 is connected to the interruption line 18 in series. One end of the interruption inductor 1431 is connected to the processor 13 through the interruption line 18, and the other end is connected to the interruption terminal INT. When the high-frequency radiation signal interferes with the interrupted line 18, so that a high-frequency sudden change current is generated in the interrupted line 18, the interrupting inductance 1431 can suppress the high-frequency sudden change current, so as to filter out the effect of the radiation signal on the interrupted signal. interference. The interruption inductance 1431 may be greater than or equal to 15 nanohenries, such as 15 nanohenries, 100 nanohenries, 600 nanohenries, 5000 nanohenries, etc., so that the interruption inductance 1431 has a better suppression effect on high-frequency abrupt currents. Referring to FIG. 5 , in one example, the interruption filter circuit 143 may further include an interruption capacitor 1432, which is connected to the interruption line 18. Specifically, the interruption capacitor 1432 is connected between the processor 13 and the interruption inductance 1431, and the interruption One end of the capacitor 1432 is connected to the interruption line 18, and the other end is grounded. The interrupt capacitor 1432 can be used to improve the waveform quality of the interrupt signal sent from the processor 13 to the interrupt terminal INT. Of course, the interruption filter circuit 143 may not include the interruption capacitor 1432 .

Referring to FIG. 4 , one end of the filter capacitor 15 is connected between the transmitter 122 and the receiver 124 , and the other end is grounded. The filter capacitor 15 is used to filter out the interference of the radiated signal to the transmitter 122 . When the transmitter 122 is disturbed, the voltage across the transmitter 122 will be disturbed. For example, a voltage drop will occur at the end of the transmitter 122 close to the transmitter connecting terminal LEDA, which will cause the potential difference between the two ends of the transmitter 122 to increase. The intensity of the wave increases, which affects the intensity of the reflected detection wave received by the receiver 124 , that is, affects the accuracy of the distance detected by the proximity sensor 12 . The filter capacitor 15 can be greater than or equal to 0.1 microfarad, for example, can be 0.1 microfarad, 0.15 microfarad, 0.23 microfarad, 0.57 microfarad, 1.2 microfarad, etc., so that the filter capacitor 15 has better anti-interference ability.

4, the anti-interference circuit structure 10 may further include one or more pull-up resistors 19, one end of the pull-up resistor 19 is connected to the external pull-up power supply V3, and the other end is connected to the signal transmission line (the data line 171, the clock line 172 or interrupt line 18) to provide a high level when a high level is required in the signal transmission line. For example, as shown in FIG. 4 , a pull-up resistor 19 is connected to the interrupt line 18 , one end of the pull-up resistor 19 is connected between the interrupt inductor 1431 and the processor 13 , and the other end is connected to the pull-up power supply V3 to prevent the interruption A high level is provided when a high level is required on line 18.

Referring to FIGS. 2 and 6 , the circuit board 20 includes a top layer 21 , at least one middle layer 22 and a bottom layer 23 . The circuit board 20 can be a multi-layer printed board, the circuit board 20 can be used to set the anti-interference circuit structure 10, and the circuit board 20 can also be used to set the functional components of the mobile terminal 100, and the functional components can be receivers, cameras, Flash, light sensor, fingerprint recognition module, infrared fill light, structured light projector, etc.

Please refer to FIG. 1, FIG. 6 and FIG. 7, the top layer 21 is close to the front surface 32 of the housing 30, and the functional components arranged on the top layer 21 can be used to transmit signals toward the front surface 32 (for example, the receiver emits sound wave signals outward), or receive signals from the front surface. 32 The signal entering the mobile terminal 100 (for example, the front camera receives the light signal from the outside world). The transmitter 122 and the receiver 124 in the embodiment of the present invention are connected to the top layer 21 . The transmitter 122 is used for transmitting detection signals toward the front side 32 , and the receiver 124 is used for receiving detection signals reflected back to the front side 32 by external obstacles. Specifically, fixing pads 211 may be formed on the top layer 21 , the package pins of the transmitter 122 may pass through the fixing pads 211 to pass through the top layer 21 , and the package pins of the transmitter 122 may be soldered on the fixing pads 211 .

Please refer to FIG. 6, the middle layer 22 is arranged between the top layer 21 and the bottom layer 23, and the number of the middle layer 22 can be any multi-layer (three layers, four layers, five layers, six layers, seven layers, ten layers, etc.) according to actual needs ( (two or more layers), the middle layer 22 and the top layer 21 and different middle layers 22 can be connected through vias, and lines can be laid in the middle layer 22 to transmit the electrical signals of various functional components, or use For arranging lines such as data line 171, clock line 172, interrupt line 18, etc. In the embodiment of the present invention, the intermediate layer 22 includes a wiring layer 221 , a ground layer 222 and a connection layer 223 . The range enclosed by the dotted frame in FIGS. 7-10 is the area where the orthographic projection of the emitter 122 on each layer is located.

Please refer to FIG. 7 and FIG. 8 , the wiring layer 221 is adjacent to the top layer 21 , and the wiring layer 221 is laid with connection lines 2211 , such as the I2C bus 17 , the interrupt line 18 , the power line, the ground line, and the transmitter 122 . Connection lines to receiver 124, etc. A connection pad 2212 is also formed on the wiring layer 221. The connection pad 2212 corresponds to the position of the fixing pad 211. After the package pins of the transmitter 122 pass through the top layer 21, they can be fixedly connected with the connection pad 2212, and further The fixing strength of the circuit board 20 to the transmitter 122 is increased. In the embodiment of the present invention, the number of wiring layers 221 is one layer and is adjacent to the top layer 21 , and the connection lines 2211 are all laid on the wiring layer 221 . Of course, the number of wiring layers 221 may be multiple layers, for example, any multiple layers (two layers or more) such as two layers, three layers, four layers, and five layers.

Please refer to FIG. 6 and FIG. 9 , the ground layer 222 is disposed on the side of the wiring layer 221 opposite to the top layer 21 , and the ground layer 222 is formed with a shielding area 2221 . The shielding area 2221 is covered by a conductive material, specifically, the conductive material may be conductive materials such as copper, platinum, gold, silver, etc. The shielding area 2221 corresponds to the position of the transmitter 122 , and the shielding area 2221 can be used to shield the radiation emitted by the antenna 11 signal, so as to prevent the radiation signal from affecting the normal operation of the transmitter 122. The shielding area 2221 corresponds to the position of the transmitter 122, specifically, the orthographic projection of the transmitter 122 on the ground layer 222 completely falls into the shielding area 2221, or the orthographic projection of the transmitter 122 on the ground layer 222 falls completely. into the shielding area 2221. Of course, the shielding area 2221 can also correspond to the position of the receiver 124 at the same time, that is to say, the shielding area 2221 can be used to shield the interference of the radiated signal to the transmitter 122 and the receiver 124 at the same time. The orthographic projection can completely fall into the shielding area 2221 or partially fall into the shielding area 2221 .

Please refer to FIG. 6 and FIG. 10 , the connection layer 223 is disposed on the side of the ground layer 222 opposite to the wiring layer 221 . The number of the connection layers 223 may be multiple layers (two or more layers), such as two layers, three layers, four layers, ten layers, and the like. The area of the connection layer 223 corresponding to the shielding area 2221 is made of insulating material, so that when the antenna 11 is connected to the bottom layer 23 , the influence of the connection layer 223 on the transmission and reception of radiated signals by the antenna 11 is reduced.

Please refer to FIGS. 2 and 6 , the bottom layer 23 is close to the back 34 of the casing 30 , and the functional components disposed on the bottom layer 23 can be used to transmit signals toward the back 34 or the top (eg, a flash emits light signals outward), or receive signals from the back 34 A signal entering the mobile terminal 100 (for example, a rear camera receives an external light signal). The antenna 11 of the embodiment of the present invention can be connected to the bottom layer 23 through the elastic sheet 50 , and the radiation signal emitted by the antenna 11 in the direction of the transmitter 122 and the receiver 124 is at least partially shielded by the shielding area 2221 to reduce the interference of the radiation signal to the proximity sensor 12 . At the same time, the proximity sensor 12 is arranged on the top layer 21, the distance between the proximity sensor 12 and the antenna 11 is relatively far, and the mutual interference between the two is relatively weak.

To sum up, in the mobile terminal 100 of the embodiment of the present invention, the filtering module 14 is used to filter the interference of the radiation signal of the antenna 11 to the I2C bus 17, so that the signal transmission between the processor 13 and the proximity sensor 12 is relatively stable, and at the same time, The filter capacitor 15 is used to filter out the interference of the radiation signal to the transmitter 122 , the emission intensity of the transmitter 122 is easy to control, and the working reliability of the proximity sensor 12 is high.

In one embodiment, the anti-jamming circuit structure 10 includes the aforementioned antenna 11 , the processor 13 and the proximity sensor 12 . The antenna 11 is used to transmit radiation signals to the outside, the processor 13 is connected to the proximity sensor 12 through the I2C bus 17, and the anti-jamming circuit structure 10 also includes a filter module 14, the filter module 14 is connected to the I2C bus 17, and the filter module 14 is used for filtering. In addition to the interference of the radiated signal to the I2C bus 17. In this embodiment, the filtering module 14 is used to filter the interference of the radiated signal of the antenna 11 to the I2C bus 17 , so that the signal transmission between the processor 13 and the proximity sensor 12 is relatively stable, and the working reliability of the proximity sensor 12 is relatively high.

In another embodiment, the anti-jamming circuit structure 10 includes the aforementioned antenna 11 and the proximity sensor 12 . The antenna 11 is used to transmit radiation signals outward. Proximity sensor 12 includes an interconnected transmitter 122 for transmitting a detection signal and a receiver 124 for receiving the reflected detection signal. The anti-interference circuit structure 10 further includes a filter capacitor 15 , one end of the filter capacitor 15 is connected between the transmitter 122 and the receiver 124 , and the other end is grounded. In this embodiment, the filter capacitor 15 is used to filter the interference of the radiation signal to the transmitter 122 , the emission intensity of the transmitter 122 is easy to control, and the working reliability of the proximity sensor 12 is high.

In the description of this specification, reference is made to the terms "some embodiments," "one embodiment," "some embodiments," "exemplary embodiments," "examples," "specific examples," or "some examples." Described means that a particular feature, structure, material, or characteristic described in connection with the described embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features delimited with "first", "second" may expressly or implicitly include at least one of said features. In the description of the present invention, "plurality" means at least two, such as two, three, unless expressly and specifically defined otherwise.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to changes, modifications, substitutions and alterations, and the scope of the present invention is defined by the claims and their equivalents.

Claims (12)

1. An anti-interference circuit structure is characterized in that, comprising an antenna and a proximity sensor, the antenna is used for emitting radiation signals outward, the proximity sensor comprises a transmitter and a receiver that are connected to each other, and the receiver comprises a transmitter. The transmitter connection terminal, one end of the transmitter connection terminal is directly connected to the transmitter end, the information of the detection wave emitted by the transmitter can be transmitted to the receiver through the transmitter connection terminal, the transmitter is used for transmitting detection signals, and the receiver is used for receiving. For the reflected detection signal, the anti-interference circuit structure further includes a filter capacitor, one end of the filter capacitor is connected between the transmitter and the receiver, and the other end is grounded, and the filter capacitor is used for Filter out the interference of the radiation signal to the transmitter; one end of the transmitter is connected to the receiver, and the other end is connected to the power supply of the transmitter, the anti-interference circuit structure also includes a bypass capacitor, the bypass capacitor One end of the circuit capacitor is connected between the transmitter and the power supply of the transmitter, and the other end is grounded. 2 . The anti-interference circuit structure according to claim 1 , wherein the filter capacitor is greater than or equal to 0.1 microfarad. 3 . 3. The anti-jamming circuit structure according to claim 1, wherein the anti-jamming circuit structure further comprises: a processor connected to the receiver via an I2C bus; and A filter module, the filter module is connected to the I2C bus, and the filter module is used to filter out the interference of the radiation signal to the I2C bus. 4. The anti-interference circuit structure according to claim 3, wherein the I2C bus comprises a data line and a clock line, the data line is used for transmitting data signals, the clock line is used for transmitting clock signals, and the The filtering module includes a data filtering circuit and a clock filtering circuit, the data filtering circuit is connected to the data line and is used to filter the interference of the radiation signal to the data signal, and the clock filtering circuit is connected to the data signal. on the clock line, and is used to filter out the interference of the radiation signal to the clock signal. 5 . The anti-interference circuit structure according to claim 4 , wherein the receiver comprises a data terminal, the data filter circuit comprises a data inductor, the data inductor is connected in series with the data line, and the data One end of the inductor is connected to the processor through the data line, and the other end is connected to the data terminal. 6 . The anti-jamming circuit structure according to claim 5 , wherein the data filtering circuit further comprises a data capacitor connected to the data line, and the data capacitor is connected to the processor and the data inductor. 7 . In between, one end of the data capacitor is connected to the data line, and the other end is grounded. 7 . The anti-jamming circuit structure according to claim 4 , wherein the receiver comprises a clock terminal, the clock line filter circuit comprises a clock inductor, the clock inductor is connected in series with the clock line, and the One end of the clock inductor is connected to the processor through the clock line, and the other end is connected to the clock terminal. 8 . The anti-interference circuit structure according to claim 7 , wherein the clock filter circuit further comprises a clock capacitor connected to the clock line, and the clock capacitor is connected to the processor and the clock inductor. 9 . In between, one end of the clock capacitor is connected to the clock line, and the other end is grounded. 9. A mobile terminal, comprising: a circuit board comprising a top layer, a bottom layer, and at least one intermediate layer, the top layer facing away from the bottom layer, the intermediate layer being located between the top layer and the bottom layer; and The anti-jamming circuit structure according to any one of claims 1-8, wherein the antenna is connected to the bottom layer, and the transmitter is connected to the top layer; The intermediate layer includes a ground layer, and the ground layer is formed with a shielding area covered by a conductive material, and the shielding area corresponds to the position of the transmitter. 10 . The mobile terminal according to claim 9 , wherein the middle layer further comprises a wiring layer, the wiring layer is located between the ground layer and the top layer, and the transmitter passes through the wiring layer. 11 . The top layer is electrically connected to the wiring layer. 11 . The mobile terminal according to claim 10 , wherein the ground layer and the top layer are separated by only one wiring layer. 12 . 12 . The mobile terminal according to claim 9 , wherein the intermediate layer further comprises at least one connecting layer between the bottom layer and the ground layer, the connecting layer corresponding to the shielding area. 13 . The area is made of insulating material.

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