CN107809506B

CN107809506B - Anti-interference circuit structure and mobile terminal

Info

Publication number: CN107809506B
Application number: CN201711183478.2A
Authority: CN
Inventors: 武小勇; 李枝佩
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-11-23
Filing date: 2017-11-23
Publication date: 2020-09-15
Anticipated expiration: 2037-11-23
Also published as: CN107809506A

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-interference circuit structure and mobile terminal

Technical Field

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

Background

At present, mobile phones develop towards narrow frames and large screen occupation ratios, and with the continuous expansion of the screen occupation ratios, functional devices of the mobile phones are arranged more closely, for example, a proximity sensor and an antenna, the proximity sensor may be arranged in a clearance area of the antenna, so that the proximity sensor is easily interfered by antenna radiation and has poor reliability.

Disclosure of Invention

The embodiment of the invention provides an anti-interference circuit structure and a mobile terminal.

The anti-interference circuit structure comprises an antenna and a proximity sensor, wherein the antenna is used for emitting radiation signals outwards, the proximity sensor comprises a transmitter and a receiver which are connected with each other, the transmitter is used for emitting detection signals, the receiver is used for receiving the reflected detection signals, 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 the radiation signals to the transmitter.

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

In some embodiments, the transmitter is connected to the receiver at one end and to a transmitter power supply at the other end, and the immunity circuit structure further includes a bypass capacitor having one end connected between the transmitter and the transmitter power supply and the other end connected to ground.

In some embodiments, the immunity circuit structure further includes:

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

a filtering module connected to the I2C bus, the filtering module being configured to filter interference of the radiated signal on 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, 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 for filtering the interference of the radiation signal to the data signal, and the clock filtering circuit is connected to the clock line and is used for filtering the interference of the radiation signal to the clock signal.

In some embodiments, the receiver includes a data terminal, and the data filter circuit includes a data inductor connected in series to the data line, the data inductor being connected to the processor at one end and to the data terminal at another end of the data line.

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

In some embodiments, the receiver includes a clock terminal, and the clock line filter circuit includes a clock inductor connected in series to the clock line, the clock inductor being connected to the processor at one end and to the clock terminal at another end of the clock line.

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, one end of the clock capacitor is connected to the clock line, and the other end of the clock capacitor is grounded.

The mobile terminal of the embodiment of the invention comprises:

the circuit board comprises a top layer, a bottom layer and at least one middle layer, wherein the top layer is opposite to the bottom layer, and the middle layer is positioned between the top layer and the bottom layer; and

in the anti-jamming circuit structure of any 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 flooring layer formed with a shielding region covered with a conductive material, the shielding region corresponding to a position of the transmitter.

In some embodiments, the middle layer further comprises a routing layer between the paved layer and the top layer, the transmitter passing through the top layer to electrically connect with the routing layer.

In certain embodiments, the paved layer is separated from the top layer by only one of the routing layers.

In some embodiments, the middle layer further comprises at least one connection layer located between the bottom layer and the bedding layer, and a region of the connection layer corresponding to the shielding region is made of an insulating material.

In the anti-interference circuit structure and the mobile terminal, 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.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.

Drawings

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

FIG. 1 is a schematic plan view of a mobile terminal of an embodiment of the present invention;

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

FIG. 3 is a block schematic diagram of an anti-jamming circuit arrangement according to an embodiment of the present invention;

FIG. 4 is a schematic circuit diagram of an exemplary embodiment of the interference rejection circuit configuration of the present invention;

FIG. 5 is a schematic circuit diagram of a tamper resistant circuit configuration according to another embodiment of the present invention;

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

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

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

FIG. 9 is a schematic plan view of a flooring layer of a circuit board of an embodiment of the present invention;

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

Description of the main element symbols:

mobile terminal 100, anti-jamming circuit arrangement 10, antenna 11, proximity sensor 12, transmitter 122, receiver 124, power supply 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, anchor pad 211, intermediate layer 22, routing layer 221, connection line 2211, connection pad 2212, ground layer 222, shield area 2221, connection line 2211, connection line 2212, ground layer 222, shield area, The connecting layer 223, the bottom layer 23, the housing 30, the front surface 32, the back surface 34, the top 36, the bottom 38, the display screen 40, and the elastic sheet 50.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.

In addition, the embodiments of the present invention described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the embodiments of the present invention, and are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 and 2, a mobile terminal 100 according to an embodiment of the present invention includes an anti-jamming circuit structure 10 and a circuit board 20. The mobile terminal 100 may be a mobile phone, a watch, a head display device, a notebook computer, a tablet computer, etc., and the embodiment of the present invention is described by taking the mobile terminal 100 as a mobile phone, it is understood that the specific form of the mobile terminal 100 may be other. The mobile terminal 100 may further include a housing 30, wherein the anti-tamper circuit structure 10 and the circuit board 20 are both housed in the housing 30, and the housing 30 may be used to provide protection against water, dust, falling, etc. to the anti-tamper circuit structure 10 and the circuit board 20. The housing 30 includes opposing front and

back sides

32, 34, the front and

back sides

32, 34 being connected by a top portion 36 and a bottom portion 38, and the front side 32 having a display 40 for the mobile terminal 100.

Referring to fig. 3 and 4, the anti-jamming circuit structure 10 includes an antenna 11, a proximity sensor 12, a processor 13, a filtering module 14, and a filtering capacitor 15. The immunity circuit structure 10 is disposed on a circuit board 20.

Referring to fig. 2, the antenna 11 may 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 may transmit a radiation signal to the outside or receive an external radiation signal to enable the mobile terminal 100 to communicate with the outside. Specifically, the antenna 11 may 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 may contact the antenna 11 at the feed point. In the embodiment of the present invention, the antenna 11 may be fixed on the housing 30, and in particular, the antenna 11 may be fixed on the top 36 of the housing 30 to reduce the blocking effect of other parts of the mobile terminal 100 on the radiation signal of the antenna 11.

Referring to fig. 1 and 2, the proximity sensor 12 includes a transmitter 122 and a receiver 124. The proximity sensor 12 may also be located near the top 36 to allow the proximity sensor 12 and the antenna 11 to be arranged more compactly, to conserve space available for arranging the display screen 40, and to improve the screen real estate of the mobile terminal 100. The proximity sensor 12 may be used to determine a distance between the front 32 of the housing 30 and an external obstacle, 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 a screen-off operation of the mobile terminal 100 is triggered. Specifically, the transmitter 122 may transmit a detection wave outward from the front surface 32, the detection wave is reflected by an external obstacle during propagation, and the receiver 124 receives the detection wave reflected back from the outside, and further determines the distance between the front surface 32 and the external obstacle by processing the intensity of the reflected detection wave. It is understood that the transmitter 122 is connected to the receiver 124 so that the receiver 124 can easily acquire information of the detection wave transmitted from the transmitter 122. For example, the receiver 124 may obtain time information of the transmitter 122 emitting the detection wave, and the receiver 124 may start detecting the reflected detection wave only after the transmitter 122 emits the detection wave; the receiver 124 may obtain the intensity information of the detection wave transmitted by the transmitter 122 for comparison with the intensity information of the detection wave reflected back. Referring to fig. 4, one end of the transmitter 122 is connected to the receiver 124, the other end is connected to a transmitter power source V2, the transmitter power source V2 is used for providing power to the transmitter 122, preferably, the anti-jamming circuit structure 10 further includes a bypass capacitor 1a, one end of the bypass capacitor 1a is connected between the transmitter 122 and the transmitter power source V2, the other end is grounded, and the bypass capacitor 1a can be used for filtering high-frequency jamming in the transmitter power source V2.

The emitter 122 may be an infrared light emitter 122 for emitting infrared light outward; the transmitter 122 may also be an ultrasonic transmitter 122 for transmitting ultrasonic waves outwards; the transmitter 122 may also be a laser transmitter 122 for emitting laser light outwards. 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, which can emit infrared light under the driving of electric energy, and the receiver 124 is an infrared light receiver.

Referring to fig. 3 and 4, the receiver 124 includes a power supply 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 for connecting an external receiver power supply V1, the receiver power supply V1 is used for supplying power to the receiver 124, and preferably, a ground capacitor 16 may be connected between the receiver power supply V1 and the power supply terminal VDD, one end of the ground capacitor 16 is connected between the receiver power supply V1 and the power supply terminal VDD, and the other end is grounded, and the ground capacitor 16 may be used for filtering high-frequency interference in the receiver power supply V1. The ground terminal GND is used to connect the receiver 124 with ground for defining a low level and may be used to prevent the influence of external static electricity. The transmitter connection terminal LEDA is used to connect with the transmitter 122, and information of the detection wave transmitted by the transmitter 122 may be transmitted to the receiver 124 through the transmitter connection terminal LEDA. The data terminal SDA may be used to connect the receiver 124 and the processor 13 to enable data signal transmission between the receiver 124 and the processor 13. The clock terminal SCL may be used to connect the receiver 124 and the processor 13 to enable clock signal transmission between the receiver 124 and the processor 13. The interrupt terminal INT may be used to connect the receiver 124 and the processor 13 to enable interrupt signal transmission between the receiver 124 and the processor 13.

Referring to fig. 3 and 4, the processor 13 is connected to the proximity sensor 12. The processor 13 may be communicatively coupled to the receiver 124 to receive the intensity information of the reflected detection waves 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 the external obstacle. Specifically, the processor 13 is connected to the receiver 124 of the proximity sensor 12, and more specifically, the processor 13 is connected to the receiver 124 through the I2C bus 17 and the interrupt line 18. The I2C bus 17 includes data lines 171 and clock lines 172. The data line 171 connects the data terminal SDA and the processor 13, and is used for transmitting a data signal; a clock line 172 connects the clock terminal with the processor 13 and is used to transmit a clock signal. An interrupt line 18 connects the interrupt terminal INT and the processor 13, and is used to transmit an interrupt signal.

Referring to fig. 2-4, it can be appreciated that in order to make the antenna 11 and the proximity sensor 12 more compact, the proximity sensor 12 may be located within a clearance area of the antenna 11, and in the clearance area of the antenna 11, the proximity sensor 12 is susceptible to interference from a radiation signal emitted by the antenna 11. Taking the I2C bus 17 as an example of interference, the radiated signal may change the waveform of the signal transmitted on the I2C bus 17, which may cause the processor 13 to receive wrong information, and may cause related modules of the processor 13 to crash, which may cause the functional devices connected on the entire I2C bus 17 to fail. Therefore, it is desirable to design the filtering module 14 in the jammer circuit configuration 10. The filtering module 14 may be configured to filter interference of the radiation signal emitted by the antenna 11 on the I2C bus 17, and the filtering module 14 may also be configured to filter interference of the radiation signal emitted by the antenna 11 on the interrupt signal transmitted by the interrupt wire 18. Specifically, the filter module 14 includes a data filter circuit 141, a clock filter circuit 142, and an interrupt filter circuit 143.

The data filter circuit 141 is connected to the data line 171 and is configured to filter interference of the radiation signal with the data signal. The data filter circuit 141 includes a data inductor 1411, and the data inductor 1411 is connected in series to the data line 171. One end of the data inductor 1411 is connected to the processor 13 via the data line 171, and the other end is connected to the data terminal SDA. When a high-frequency radiation signal interferes with the data line 171, so that a high-frequency abrupt current is generated in the data line 171, the data inductor 1411 can suppress the high-frequency abrupt current to filter the interference of the radiation signal on the data signal. The data inductor 1411 may be greater than or equal to 15 nanohenries, such as 15 nanohenries, 100 nanohenries, 177 nanohenries, 2000 nanohenries, etc., so that the data inductor 1411 has a good effect of suppressing high-frequency inrush currents. Referring to fig. 5, in an example, the data filter circuit 141 may further include a data capacitor 1412, the data capacitor 1412 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 the data capacitor 1412 is connected to the data line 171, and the other end is grounded. The data capacitor 1412 may be used to improve the waveform quality of the data signal transmitted 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 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 in series to the clock line 172. The clock inductor 1421 has one end connected to the processor 13 via the clock line 172 and the other end connected to the clock terminal SCL. When the high-frequency radiation signal interferes with the clock line 172, so that a high-frequency abrupt current is generated in the clock line 172, the clock inductor 1421 can suppress the high-frequency abrupt current to filter the interference of the radiation signal to the clock signal. The clock inductor 1421 may be greater than or equal to 15 nanohenries, such as 15 nanohenries, 100 nanohenries, 500 nanohenries, 1000 nanohenries, etc., so that the clock inductor 1421 has a good effect of suppressing high-frequency inrush currents. Referring to fig. 5, in an example, the clock filter circuit 142 may further include a clock capacitor 1422, the clock capacitor 1422 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 the clock capacitor 1422 is connected to the clock line 172, and the other end is grounded. The clock capacitance 1422 may be used to improve the waveform quality of the clock signal transmitted from the processor 13 to the clock terminal SCL. Of course, the clock filter circuit 142 may not include the clock capacitor 1422.

The interrupt filter circuit 143 is connected to the interrupt line 18 and is used to filter the interference of the radiation signal to the interrupt signal. The interrupt filter circuit 143 includes an interrupt inductor 1431, and the interrupt inductor 1431 is connected in series to the interrupt line 18. The interrupt inductor 1431 has one end connected to the processor 13 via an interrupt line 18 and the other end connected to an interrupt terminal INT. When a high-frequency radiation signal interferes with the interrupt wire 18, so that a high-frequency abrupt current is generated in the interrupt wire 18, the interrupt inductor 1431 can generate a suppression effect on the high-frequency abrupt current, so as to filter the interference of the radiation signal on the interrupt signal. The interrupt inductor 1431 may be greater than or equal to 15 nanohenries, such as 15 nanohenries, 100 nanohenries, 600 nanohenries, 5000 nanohenries, and the like, so that the interrupt inductor 1431 has a good effect of suppressing high-frequency rush current. Referring to fig. 5, in an example, the interrupt filter circuit 143 may further include an interrupt capacitor 1432, where the interrupt capacitor 1432 is connected to the interrupt line 18, specifically, the interrupt capacitor 1432 is connected between the processor 13 and the interrupt inductor 1431, and one end of the interrupt capacitor 1432 is connected to the interrupt line 18 and the other end is connected to ground. Interrupt capacitor 1432 may be used to improve the waveform quality of the interrupt signal sent from processor 13 to interrupt terminal INT. Of course, the interrupt filter circuit 143 may not include the interrupt 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, and the filter capacitor 15 is used for filtering interference of the radiation signal to the transmitter 122. When the transmitter 122 is interfered, the voltage across the transmitter 122 may be interfered, for example, a voltage drop may be generated at one end of the transmitter 122 close to the transmitter connection terminal LEDA, so that the potential difference across the transmitter 122 becomes large, the intensity of the transmitted detection wave becomes large, and the intensity of the reflected detection wave received by the receiver 124, that is, the accuracy of the detection distance of the proximity sensor 12, is affected. The filter capacitor 15 may be greater than or equal to 0.1 microfarad, for example, 0.1 microfarad, 0.15 microfarad, 0.23 microfarad, 0.57 microfarad, 1.2 microfarad, etc., so that the filter capacitor 15 has better interference rejection capability.

Referring to fig. 4, the immunity circuit structure 10 may further include one or more pull-up resistors 19, where one end of the pull-up resistor 19 is connected to an external pull-up power source V3, and the other end is connected to the signal transmission line (the data line 171, the clock line 172, or the interrupt line 18) to provide a high level when the 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, so as to provide a high level when the high level is required on the interrupt line 18.

Referring to fig. 2 and 6, the circuit board 20 includes a top layer 21, at least one intermediate layer 22, and a bottom layer 23. The circuit board 20 can be a multilayer printed board, and the circuit board 20 can be used for setting the anti-interference circuit structure 10, and the circuit board 20 can also be used for setting the functional components of the mobile terminal 100, and the functional components can be a receiver, a camera, a flash lamp, a light sensor, a fingerprint identification module, an infrared light supplement lamp, a structured light projector and the like.

Referring to fig. 1, 6 and 7, the top layer 21 is close to the front surface 32 of the housing 30, and the functional components disposed on the top layer 21 can be used for transmitting signals toward the front surface 32 (for example, the receiver transmits sound wave signals outwards), or receiving signals entering the mobile terminal 100 from the front surface 32 (for example, the front camera receives external light signals). A transmitter 122 and a receiver 124 of an embodiment of the present invention are attached to the top layer 21, the transmitter 122 being configured to transmit a detection signal toward the front surface 32, and the receiver 124 being configured to receive the detection signal reflected back toward the front surface 32 by an external obstacle. Specifically, a fixing pad 211 may be formed at the top layer 21, package pins of the emitter 122 may pass through the fixing pad 211 to pass through the top layer 21, and the package pins of the emitter 122 are soldered on the fixing pad 211.

Referring to fig. 6, the middle layer 22 is disposed between the top layer 21 and the bottom layer 23, the number of the middle layer 22 may be any number of three, four, five, six, seven, ten, or other layers (two or more than two layers) according to actual requirements, the middle layer 22 may be connected with the top layer 21 and different middle layers 22 through via holes, and a circuit may be laid in the middle layer 22 for transmitting an electrical signal of each functional component, and may also be used for disposing circuits such as a data line 171, a clock line 172, and an interrupt line 18. In an embodiment of the present invention, the intermediate layer 22 includes a routing layer 221, a bedding layer 222, and a tie layer 223. Wherein the extent enclosed by the dashed boxes in fig. 7-10 is the area in which the orthographic projection of the emitter 122 on each layer is located.

Referring to fig. 7 and 8, the wiring layer 221 is adjacent to the top layer 21, and a connection line 2211 is disposed on the wiring layer 221, such as an I2C bus 17, an interrupt line 18, a power line, a ground line, a connection line for the transmitter 122 and the receiver 124, and the like. A connection pad 2212 is further formed on the wiring layer 221, the connection pad 2212 corresponds to the position of the fixing pad 211, and when the package pins of the emitter 122 pass through the top layer 21, the connection pad 2212 can be fixedly connected with the connection pad 2212, so that the fixing strength of the circuit board 20 to the emitter 122 is further increased. In the embodiment of the present invention, the routing layer 221 is one layer and is adjacent to the top layer 21, and the connection lines 2211 are laid on the routing layer 221. Of course, the number of routing layers 221 may be multiple layers, such as two layers, three layers, four layers, five layers, and any multiple layers (two or more layers).

Referring to fig. 6 and 9, the ground layer 222 is disposed on a side of the routing layer 221 opposite to the top layer 21, and the ground layer 222 forms a shielding region 2221. The shielding area 2221 is covered by a conductive material, specifically, the conductive material may be a conductive material such as copper, platinum, gold, silver, etc., the shielding area 2221 corresponds to the position of the transmitter 122, and the shielding area 2221 may be used to shield the radiation signal transmitted by the antenna 11, so as to prevent the radiation signal from affecting the normal operation of the transmitter 122. The shielded area 2221 corresponds to the position of the transmitter 122, and specifically, the orthographic projection of the transmitter 122 on the flooring 222 may completely fall into the shielded area 2221, or the orthographic projection of the transmitter 122 on the flooring 222 may partially fall into the shielded area 2221. Of course, the shielding area 2221 may also correspond to the position of the receiver 124 at the same time, that is, the shielding area 2221 may be used to shield the interference of the radiation signal to the transmitter 122 and the receiver 124 at the same time, and the orthographic projection of the receiver 124 on the flooring 222 may fall completely into the shielding area 2221, or may fall partially into the shielding area 2221.

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

Referring to fig. 2 and 6, the bottom layer 23 is close to the back surface 34 of the housing 30, and the functional components disposed on the bottom layer 23 may be used for transmitting signals to the back surface 34 or the top end (for example, a flash emits light signals outwards), or receiving signals entering the mobile terminal 100 from the back surface 34 (for example, a rear camera receives external light signals). The antenna 11 of the embodiment of the present invention may be connected to the bottom layer 23 through the elastic sheet 50, and the radiation signal emitted from the antenna 11 to the direction of the emitter 122 and the receiver 124 is at least partially shielded by the shielding area 2221, so as to reduce interference of the radiation signal to the proximity sensor 12, and meanwhile, the proximity sensor 12 is disposed on the top layer 21, and the proximity sensor 12 is farther away from the antenna 11, and the mutual interference between the proximity sensor 12 and the antenna 11 is weaker.

In summary, in the mobile terminal 100 according to the embodiment of the present invention, the filtering module 14 is configured to filter interference of a radiation signal of the antenna 11 on the I2C bus 17, so that signal transmission between the processor 13 and the proximity sensor 12 is relatively stable, meanwhile, the filtering capacitor 15 is configured to filter interference of the radiation signal on the emitter 122, the emission intensity of the emitter 122 is easily controlled, and the operational reliability of the proximity sensor 12 is relatively high.

In one embodiment, the immunity circuit structure 10 includes the antenna 11, processor 13, and proximity sensor 12 described above. The antenna 11 is used for emitting radiation signals outwards, the processor 13 is connected with the proximity sensor 12 through an I2C bus 17, the anti-jamming circuit structure 10 further comprises a filtering module 14, the filtering module 14 is connected to the I2C bus 17, and the filtering module 14 is used for filtering the interference of the radiation signals to the I2C bus 17. In this embodiment, the filtering module 14 is configured to filter interference of a radiation signal of the antenna 11 on the I2C bus 17, so that signal transmission between the processor 13 and the proximity sensor 12 is relatively stable, and the operational reliability of the proximity sensor 12 is relatively high.

In another embodiment, the immunity circuit structure 10 includes the antenna 11 and the proximity sensor 12 described above. The antenna 11 is used to emit a radiation signal to the outside. The proximity sensor 12 includes an emitter 122 and a receiver 124 connected to each other, the emitter 122 for emitting a detection signal, and the receiver 124 for receiving the reflected detection signal. The anti-jamming 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, and the filter capacitor 15 is used for filtering interference of the radiation signal to the transmitter 122. In this embodiment, the filter capacitor 15 is used to filter the interference of the radiation signal to the transmitter 122, the transmission intensity of the transmitter 122 is easy to control, and the operational reliability of the proximity sensor 12 is high.

In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the 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.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.

Claims

1. An anti-jamming circuit structure is characterized by comprising an antenna and a proximity sensor, wherein the antenna is used for emitting radiation signals outwards, the proximity sensor comprises a transmitter and a receiver which are connected with each other, the receiver comprises a transmitter connecting terminal, one end of the transmitter connecting terminal is directly connected with one end of the transmitter, information of detection waves emitted by the transmitter can be transmitted to the receiver through the transmitter connecting terminal, the transmitter is used for emitting detection signals, the receiver is used for receiving the detection signals reflected back, the anti-jamming 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 jamming of the radiation signals to the transmitter; one end of the transmitter is connected with the receiver, the other end of the transmitter is connected with a transmitter power supply, the anti-jamming circuit structure further comprises a bypass capacitor, one end of the bypass capacitor is connected between the transmitter and the transmitter power supply, and the other end of the bypass capacitor is grounded.

2. The jammer rejection circuit configuration of claim 1, wherein said filter capacitance is greater than or equal to 0.1 microfarads.

3. The immunity circuit structure of claim 1, further comprising:

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

4. The immunity circuit structure of claim 3, wherein the I2C bus comprises 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, the filtering module comprises a data filtering circuit and a clock filtering circuit, the data filtering circuit is connected to the data line and is used for filtering the interference of the radiation signal to the data signal, and the clock filtering circuit is connected to the clock line and is used for filtering the interference of the radiation signal to the clock signal.

5. The antijam circuit configuration of claim 4, wherein the receiver includes a data terminal, and the data filter circuit includes a data inductor connected in series with the data line, the data inductor being connected to the processor at one end and to the data terminal at the other end of the data line.

6. The antijam circuit configuration of claim 5, wherein the data filter circuit further includes a data capacitor connected to the data line, the data capacitor being connected between the processor and the data inductor, one end of the data capacitor being connected to the data line and the other end of the data capacitor being connected to ground.

7. The immunity circuit structure of claim 4, wherein said receiver includes a clock terminal, and wherein said clock line filter circuit includes a clock inductor, said clock inductor being connected in series with said clock line, said clock inductor being connected to said processor at one end of said clock line and to said clock terminal at another end of said clock line.

8. The immunity circuit structure of claim 7, wherein said clock filter circuit further comprises a clock capacitor connected to said clock line, said clock capacitor connected between said processor and said clock inductor, one end of said clock capacitor connected to said clock line and the other end of said clock capacitor connected to ground.

9. A mobile terminal, comprising:

the immunity circuit structure of any of claims 1-8, wherein said antenna is attached to said bottom layer and said transmitter is attached to said top layer;

10. The mobile terminal of claim 9, wherein the middle layer further comprises a routing layer between the bedding layer and the top layer, the transmitter passing through the top layer to electrically connect with the routing layer.

11. The mobile terminal of claim 10, wherein the paved layer is spaced from the top layer by only one of the routing layers.

12. The mobile terminal of claim 9, wherein the middle layer further comprises at least one connection layer between the bottom layer and the ground layer, and a region of the connection layer corresponding to the shielding region is made of an insulating material.