CN104967492B - A kind of detection circuit and terminal - Google Patents
A kind of detection circuit and terminal Download PDFInfo
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- CN104967492B CN104967492B CN201510292121.2A CN201510292121A CN104967492B CN 104967492 B CN104967492 B CN 104967492B CN 201510292121 A CN201510292121 A CN 201510292121A CN 104967492 B CN104967492 B CN 104967492B
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Abstract
This application discloses a kind of detection circuit and terminal.Wherein, detection circuit includes RF receiving and transmission module, coupling module and detection module, and coupling module connection RF receiving and transmission module and detection module, coupling module include coupling resistance and switch element；One end connection RF receiving and transmission module of coupling resistance, the input terminal of the other end connecting valve unit of coupling resistance, the output terminal connecting detection module of switch element；When detecting the received signal strength of RF receiving and transmission module, the input terminal of switch element and the output terminal of switch element, which are established, to be connected, the radiofrequency signal that coupling module receives RF receiving and transmission module is coupled to detection module, detection module is detected the received signal strength of RF receiving and transmission module；When having detected the received signal strength of RF receiving and transmission module, the input terminal of switch element and the output terminal of switch element disconnect.Such scheme, can reduce radio frequency signal attenuation caused by coupling module, improve accuracy of detection and receiving sensitivity.
Description
Technical field
This application involves the communications field, particularly a kind of detection circuit and terminal.
Background technology
In radio circuit or the detection of broadband time slot, detection circuit is generally included, as shown in Figure 1, detection circuit includes penetrating
Frequency transceiver module 110, coupling module 120 and detection module 130.Coupling module 120 connect respectively RF receiving and transmission module 110 with
And detection module 130.RF receiving and transmission module 110 is used for transmission radiofrequency signal；Coupling module 120 is used for RF receiving and transmission module
110 radiofrequency signals received are coupled to detection module 130；Detection module 130 is used for the reception for detecting RF receiving and transmission module 120
Signal strength (Received Signal Strength Indication, RSSI).
Wherein, coupling module 120 is usually made of coupled capacitor.However, the coupling by coupling module 120 as shown in Figure 2
Right and signal attenuation curve map is understood, during using this coupled modes, the degree of coupling of coupling module 120 can be with frequency
Change and change, degree of coupling fluctuation range is more than 30dB, so as to cause the RSSI that detection module 130 is arrived in different frequency detectings
Difference, measurement error are larger；Also, coupling module 120 also results in larger signal attenuation, receiving sensitivity is reduced.
The content of the invention
The application provides a kind of detection circuit and terminal, can reduce signal attenuation, improves accuracy of detection and receives spirit
Sensitivity.
To solve the above problems, the technical solution that the application uses is：A kind of detection circuit is provided, including radio frequency is received
Module, coupling module and detection module are sent out, the coupling module connects the RF receiving and transmission module and the detection module,
Wherein, the coupling module includes coupling resistance and switch element；One end of the coupling resistance connects the radio-frequency receiving-transmitting
Module, the other end of the coupling resistance connect the input terminal of the switch element, the output terminal connection institute of the switch element
State detection module；The RF receiving and transmission module is used for transmission radiofrequency signal；The coupling module is used for the radio-frequency receiving-transmitting mould
The radiofrequency signal that block receives is coupled to the detection module；The detection module is used to detect connecing for the RF receiving and transmission module
Receive signal strength；When detecting the received signal strength of the RF receiving and transmission module, the input terminal of the switch element with it is described
The output terminal of switch element establishes connection, and the radiofrequency signal that the RF receiving and transmission module receives is coupled to by the coupling module
The detection module, enables the detection module to detect the received signal strength of the RF receiving and transmission module；When having detected
When stating the received signal strength of RF receiving and transmission module, the input terminal of the switch element and the output terminal of the switch element disconnect
Connection.
Wherein, the circuit further includes control module, the control module connect respectively the RF receiving and transmission module and
The detection module, the control module are used to penetrate according to the adjustment of the intensity for the radiofrequency signal that the detection module detects
The receiving sensitivity of frequency transceiver module.
Wherein, the switch element further includes control terminal, and the control terminal of the switch element connects the control module；When
When detecting the received signal strength of the RF receiving and transmission module, the control module controls the input terminal to be built with the output terminal
Vertical connection；When having detected the received signal strength of the RF receiving and transmission module, the control module control the input terminal with
The output terminal disconnects.
Wherein, the switch element includes electronic switch, and the electronic switch is transistor or electronic analog swtich.
Wherein, the transistor is triode or field-effect tube.
Wherein, the switch element further includes current-limiting resistance, one end connection power supply of the current-limiting resistance, the current limliting electricity
The other end of resistance connects the input terminal of the switch element.
Wherein, the switch element further includes the first choke coil, and one end connection switch of first choke coil is single
The output terminal of member, the other end ground connection of first choke coil.
Wherein, the second choke coil is also connected between the input terminal of the switch element and the current-limiting resistance.
Wherein, the switch element further includes the first divider resistance and the second divider resistance, first divider resistance
One end connect the control module, the other end of first divider resistance connects the control terminal of the electronic switch, described
The control terminal of electronic switch is also connected with one end of second divider resistance, the other end ground connection of second divider resistance.
To solve the above problems, another technical solution that the application uses is：A kind of terminal is provided, the terminal includes
Processor, memory, wherein, the terminal further includes the detection circuit described in any of the above-described, and the processor connects respectively
The memory and the detection circuit.
In such scheme, by setting coupling resistance and switch single between RF receiving and transmission module and detection module
Member, when the received signal strength of detection module detection RF receiving and transmission module, switching means conductive；After detection, switch
Unit disconnects, so as to isolate RF receiving and transmission module and detection module, can reduce radio frequency signal attenuation caused by coupling module, carry
High measurement accuracy and receiving sensitivity.
Brief description of the drawings
Fig. 1 is a kind of structure diagram for detection circuit that the prior art provides；
Fig. 2 is the degree of coupling and signal attenuation curve map of the coupling module in Fig. 1；
Fig. 3 is a kind of structure diagram of detection circuit provided by the embodiments of the present application；
The degree of coupling and signal attenuation when Fig. 4 is coupled mode provided by the embodiments of the present application switching means conductive in the block
Curve map；
Fig. 5 is the degree of coupling and signal attenuation when coupled mode provided by the embodiments of the present application switch element in the block disconnects
Curve map；
Fig. 6 is the structure diagram of another detection circuit provided by the embodiments of the present application；
Fig. 7 is the circuit structure diagram of switch element in Fig. 6；
Fig. 8 is a kind of structure diagram of terminal provided by the embodiments of the present application.
Embodiment
In being described below, in order to illustrate rather than in order to limit, it is proposed that such as particular system structure, interface, technology it
The detail of class, to understand thoroughly the application.
Refering to Fig. 2, Fig. 2 is a kind of structure diagram of detection circuit provided by the embodiments of the present application.The inspection of the present embodiment
Slowdown monitoring circuit is applied to rf terminal or broadband time slot detection terminal, but is not limited to this, and can also apply in other embodiments
In other terminals.
The detection circuit of the present embodiment includes RF receiving and transmission module 210, coupling module 220 and detection module 230, coupling
Module 220 connects RF receiving and transmission module 210 and detection module 230.Wherein, coupling module 220 include coupling resistance 221 and
Switch element 222, switch element 222 include input terminal 223 and output terminal 224.
One end connection RF receiving and transmission module 210 of coupling resistance 221, the other end connecting valve unit of coupling resistance 221
222 input terminal 223, the 224 connecting detection module 230 of output terminal of switch element 222.
RF receiving and transmission module 210 is used for transmission radiofrequency signal.Coupling module 220 is used to receive RF receiving and transmission module 210
To radiofrequency signal be coupled to detection module 230.The reception signal that detection module 230 is used to detect RF receiving and transmission module 210 is strong
Spend (Received Signal Strength Indication, RSSI).
When detecting the received signal strength of RF receiving and transmission module 210, the input terminal 223 and switch of switch element 222 are single
The output terminal 224 of member 222 establishes connection, and switch element 222 turns on, and coupling module 220 receives RF receiving and transmission module 210
Radiofrequency signal is coupled to detection module 230, detection module 230 is detected the received signal strength of RF receiving and transmission module 210.
When having detected the received signal strength of RF receiving and transmission module 210, input terminal 223 and the switch of switch element 222
The output terminal 224 of unit 222 disconnects, and switch element 222 disconnects.
Specifically, when detection module 230 detects the received signal strength of RF receiving and transmission module 210, controlling switch unit
222 input terminal 223 is established with the output terminal 224 of switch element 222 and connected, and turns on switch element 222.In switch element
After 222 conductings, the radiofrequency signal that RF receiving and transmission module 210 receives is coupled to detection module 230 by coupling module 220.Detection
Module 230 detects the received signal strength of RF receiving and transmission module 210.
When the detection of detection module 230 finishes, the input terminal 223 of controlling switch unit 222 and the output of switch element 222
End 224 disconnects, and disconnects switch element 222.
Wherein, the value of coupling resistance is bigger, and the degree of coupling of coupling module 220 is lower, and detection module 230 detects that radio frequency is received
The received signal strength for sending out module 210 is weaker.The value of coupling resistance can be set according to being actually needed, and be not restricted herein.Switch
Unit 222 can be simulant electronic switch, or other kinds of electronic switch, is not restricted herein.
In the present embodiment, the conducting of controlling switch unit 222 and the method that disconnects can for by detection module 230 to penetrating
Frequency transceiver module 210 sends trigger signal, and triggering 210 controlling switch unit 222 of RF receiving and transmission module is turned on or off；Can also
Switch element 222 is directly controlled for detection module 230 to be turned on or off.In other embodiments, it can also be other controls
Mode, is not restricted herein.
Also referring to Fig. 4 to Fig. 5, when Fig. 4 is coupled mode provided by the embodiments of the present application switching means conductive in the block
The degree of coupling and signal attenuation curve map, when Fig. 5 is that coupled mode provided by the embodiments of the present application switch element in the block disconnects
The degree of coupling and signal attenuation curve map.
As shown in figure 4, when switch element 222 turns on, the degree of coupling curve of coupling module 220 is flatter, the degree of coupling
Fluctuation range is smaller.Wherein, as frequency f=410.0MHz, the degree of coupling of coupling module 220 is -10.101dB, by coupled mode
Signal attenuation caused by block 220 is -1.5dB.
As shown in figure 5, when switch element disconnects, since the isolation of switch element 222 is not 100%, so that
The portion radio frequency signal of RF receiving and transmission module 210 is coupled to detection module 230.The degree of coupling curve of coupling module 220 is song
Line.As frequency f=410.0MHz, the degree of coupling of coupling module 220 is -31.679dB, and the signal as caused by coupling module 220 declines
It is kept to -0.07dB.
Wherein, the absolute value of the degree of coupling of coupling module 220 is bigger, and the signal attenuation that it is introduced is smaller, detection module 230
Detect that the received signal strength of RF receiving and transmission module 210 is weaker.
The absolute value of signal attenuation is bigger, and detection module 230 detects that the received signal strength of RF receiving and transmission module 210 is got over
By force.
In such scheme, coupling resistance and switch element are set between RF receiving and transmission module and detection module, when
When detection module detects the received signal strength of RF receiving and transmission module, switching means conductive；After detection, switch element breaks
Open, so as to isolate RF receiving and transmission module and detection module, radio frequency signal attenuation caused by coupling module can be reduced, improve detection
Precision and receiving sensitivity.
Refer to Fig. 6 to Fig. 7, Fig. 6 is the structure diagram of another detection circuit provided by the embodiments of the present application, Fig. 7
It is the circuit structure diagram of switch element in Fig. 6.
The detection circuit of the present embodiment is applied to rf terminal or broadband time slot detection terminal, but is not limited to this, at it
It can also be applied to other terminals in his embodiment.The detection circuit of the present embodiment includes RF receiving and transmission module 310, coupled mode
Block 320, detection module 330 and control module 340, coupling module 320 connect RF receiving and transmission module 310 and detection module
330, control module 340 connects RF receiving and transmission module 310, coupling module 320 and detection module 330 respectively.It is appreciated that
It is that detection module 230 and control module 340 can become one, or two independent modules.
Wherein, coupling module 320 includes coupling resistance 321 and switch element 322, and switch element 322 includes input terminal
323rd, output terminal 324 and control terminal 325.
One end connection RF receiving and transmission module 310 of coupling resistance 321, the other end connecting valve unit of coupling resistance 321
322 input terminal 323, the 324 connecting detection module 330 of output terminal of switch element 222, coupling module 320 pass through switch element
322 325 link control module 340 of control terminal.
Wherein, switch element 222 includes electronic switch Q, and electronic switch Q can be transistor or electronic analog swtich.It is brilliant
Body pipe can be field-effect tube, triode or Darlington transistor.
When electronic switch Q is field-effect tube, control terminal 325, input terminal 323 and the output terminal 324 of switch element 322 divide
The grid, source electrode or drain electrode of field-effect tube are not corresponded to.
Wherein, when electronic switch Q is p-type field-effect tube, grid is held in order to control, source electrode is input terminal, drain output.
When electronic switch Q is N-type field-effect tube, grid is held in order to control, the input terminal that drains, source electrode are output terminal.
When electronic switch Q is triode or Darlington transistor, the control terminal 325 of switch element 322, input terminal 323 and defeated
Outlet 324 corresponds to the base stage of Darlington transistor or triode, collector and emitter respectively.
Switch element 322 further includes current-limiting resistance R1, and one end of current-limiting resistance R1 connects power Vcc, current-limiting resistance R1's
The input terminal 323 of other end connecting valve unit 322.
Switch element 322 further includes the output of one end connecting valve unit 322 of the first choke coil L1, the first choke coil L1
End 324, the other end ground connection of the first choke coil L1.
Alternatively, it is also connected with the second choke coil L2 between the input terminal 323 and current-limiting resistance R1 of switch element 322.
Alternatively, switch element 322 further includes the first divider resistance R2 and the second divider resistance R3, the first divider resistance
One end connection of R2 passes through 325 link control module 340 of control terminal, the other end connection electronic switch Q of the first divider resistance R2
Control terminal, the control terminal of electronic switch Q is also connected with one end of the second divider resistance R3, another termination of the second divider resistance R3
Ground.
RF receiving and transmission module 210 is used for transmission radiofrequency signal.Coupling module 220 is used to receive RF receiving and transmission module 210
To radiofrequency signal be coupled to detection module 230.The reception signal that detection module 230 is used to detect RF receiving and transmission module 210 is strong
Degree.Control module 340 is used for the intensity adjustment RF receiving and transmission module 310 of the radiofrequency signal detected according to detection module 330
Receiving sensitivity.
Wherein, the current-limiting resistance R1 in switch element 322 is used for the electric current for reducing the input terminal of electronic switch Q.First grips
Stream circle L1 is used to prevent the radiofrequency signal for flowing through output terminal 324 from entering reference horizontal plane of manufacturing, and signal interference is caused to earth signal.Second
The radiofrequency signal that choke coil L2 is used to prevent from flowing through input terminal 323 is mixed with power supply, and signal interference is caused to power supply signal.First
Divider resistance R2 and the second divider resistance R3 is used to provide bias voltage for electronic switch Q.
When detection module 330 detects the received signal strength of RF receiving and transmission module 310,340 controlling switch of control module
The input terminal of unit 322 is established with the output terminal of switch element 322 and connected, and controlling switch unit 322 turns on；Work as detection module
330 when having detected the received signal strength of RF receiving and transmission module 310, the input terminal of 340 controlling switch unit 322 of control module with
The output terminal of switch element 322 disconnects, and controlling switch unit 322 disconnects.
The intensity adjustment RF receiving and transmission module 310 for the radiofrequency signal that control module 340 is detected according to detection module 330
Receiving sensitivity.
Specifically, as shown in fig. 7, the input terminal 323 of switch element 322 connects the input terminal of electronic switch Q, switch element
The output terminal of 322 output terminal connection electronic switch Q, the control terminal 325 of switch element 322 pass through the first divider resistance R2 connections
To the control terminal of electronic switch Q.
Current-limiting resistance R1 and the second choke coil L2 is also connected between the input terminal 323 and power Vcc of switch element 322.
The output terminal 324 of switch element 322 is also connected with one end of the first choke coil L1, the other end ground connection of the first choke coil L1.Switch
The control terminal 325 of unit 322 is also connected with one end of the first divider resistance R2, the other end connection electronic cutting of the first divider resistance R2
The control terminal of Q is closed, the control terminal of electronic switch Q is also connected with one end of the second divider resistance R3, and the second divider resistance R3's is another
End ground connection.
Wherein, electronic switch Q can be transistor or electronic analog swtich.Transistor can be field-effect tube, triode
Or Darlington transistor.When electronic switch Q is field-effect tube, control terminal 325, input terminal 323 and the output terminal of switch element 322
324 correspond to the grid, source electrode or drain electrode of field-effect tube respectively.Wherein, when electronic switch Q is p-type field-effect tube, grid is
Control terminal, source electrode are input terminal, drain output.When electronic switch Q is N-type field-effect tube, grid holds in order to control, it is defeated to drain
Enter end, source electrode is output terminal.
When electronic switch Q is triode or Darlington transistor, the control terminal 325 of switch element 322, input terminal 323 and defeated
Outlet 324 corresponds to the base stage of Darlington transistor or triode, collector and emitter respectively.
When the value of current-limiting resistance R1 sufficiently large (for example, R1 is more than 500 Ω), the second choke coil L2 is optional.L2 can be with
For 890nH.
When control module 340 can provide enough bias voltages for electronic switch Q, control electronic switch Q leads on-off
When opening, the first divider resistance R2 and the second divider resistance R3 are also optional.R2, R3 can be 20K Ω.
When detection module 330 detects the received signal strength of RF receiving and transmission module 310, control module 340 passes through control
325 are held to 322 input control signal of switch element, the input terminal 323 of controlling switch unit 322 and the output of switch element 322
Connection is established at end 324, turns on switch element 322.After the conducting of switch element 322, coupling module 320 passes through coupling resistance
321 and switch element 322 radiofrequency signal that RF receiving and transmission module 310 receives is coupled to detection module 330.Detection module
The received signal strength of 330 detection RF receiving and transmission modules 310.
When the detection of detection module 230 finishes, control module 340 is by control terminal 325 to 322 input control of switch element
Signal, the input terminal 323 of controlling switch unit 322 are disconnected with the output terminal 324 of switch element 322, make switch element 322
Disconnect.
Wherein, the value of coupling resistance is bigger, and the degree of coupling of coupling module 320 is lower, and detection module 330 detects that radio frequency is received
The received signal strength for sending out module 310 is weaker.The value of coupling resistance can be set according to being actually needed, and be not restricted herein.
When electronic switch Q is field-effect tube, control terminal 325, input terminal 323 and the output terminal 324 of switch element 322 divide
The grid, source electrode or drain electrode of thin film transistor (TFT) are not corresponded to.
Wherein, when electronic switch Q is p-type field-effect tube, grid is held in order to control, source electrode is input terminal, drain output.
When electronic switch Q is N-type field-effect tube, grid is held in order to control, the input terminal that drains, source electrode are output terminal.
When electronic switch Q is p-type field-effect tube, detection module 330 detects the received signal strength of RF receiving and transmission module 310
When, control module 340 is high level signal to the control signal that switch element 322 inputs by control terminal 325, and Vcc is forward direction
Voltage, to control the source electrode of field-effect tube and drain electrode to establish connection, turns on field-effect tube Q.When detection finishes, control module
340 by control terminal 325 to the control signal that switch element 322 inputs be low level signal, to control the source electrode of field-effect tube
Disconnected with drain electrode, disconnect field-effect tube Q.
When electronic switch Q is N-type field-effect tube, detection module 330 detects the received signal strength of RF receiving and transmission module 310
When, control module 340 is low level signal to the control signal that switch element 322 inputs by control terminal 325, and Vcc is forward direction
Voltage, to control the drain electrode of field-effect tube and source electrode to establish connection, turns on field-effect tube Q.When detection finishes, control module
340 by control terminal 325 to the control signal that switch element 322 inputs be high level signal, to control the drain electrode of field-effect tube
Disconnected with source electrode, disconnect field-effect tube Q.
When electronic switch Q is triode or Darlington transistor, the control terminal 325 of switch element 322, input terminal 323 and defeated
Outlet 324 corresponds to the base stage of Darlington transistor or triode, collector and emitter respectively.
Wherein, when electronic switch Q is p-type triode or p-type Darlington transistor, detection module 330 detects RF receiving and transmission module
During 310 received signal strength, control module 340 is high electricity by the control signal that control terminal 325 is inputted to switch element 322
Ordinary mail number, Vcc are forward voltage, to control the collector and emitter of field-effect tube to establish connection, make p-type triode or p-type
Darlington transistor turns on.When detection finishes, the control signal that control module 340 is inputted by control terminal 325 to switch element 322 is
Low level signal, to control the collector and emitter of field-effect tube to disconnect, makes p-type triode or p-type Darlington transistor break
Open.
When electronic switch Q is N-type triode or N-type Darlington transistor, detection module 330 detects RF receiving and transmission module 310
During received signal strength, control module 340 is believed by the control signal that control terminal 325 is inputted to switch element 322 for low level
Number, Vcc is negative voltage, to control the collector and emitter of field-effect tube to establish connection, N-type triode or N-type is reached woods
The pipe that pauses turns on.When detection finishes, control module 340 is high electricity by the control signal that control terminal 325 is inputted to switch element 322
Ordinary mail number, to control the collector and emitter of field-effect tube to disconnect, disconnects N-type triode or N-type Darlington transistor.
It is understood that electronic switch Q is not limited to simulant electronic switch, triode, Darlington transistor, field-effect tube,
It can also be other kinds of electronic switch.
After the RSSI that detection module 230 has detected RF receiving and transmission module 310, RSSI is sent to control module 340,
So that receiving sensitivity of the control module 340 according to the RSSI adjustment RF receiving and transmission modules 310 made referrals to.Wherein, detection circuit
In signal attenuation it is bigger, the receiving sensitivity of RF receiving and transmission module 310 is also poorer.
Also referring to Fig. 4 to Fig. 5, when Fig. 4 is coupled mode provided by the embodiments of the present application switching means conductive in the block
The degree of coupling and signal attenuation curve map, when Fig. 5 is that coupled mode provided by the embodiments of the present application switch element in the block disconnects
The degree of coupling and signal attenuation curve map.
As shown in figure 4, when switch element 322 turns on, the degree of coupling curve of coupling module 320 is flatter, the degree of coupling
Fluctuation range is smaller.Wherein, as frequency f=410.0MHz, the degree of coupling of coupling module 320 is -10.101dB, by coupled mode
Signal attenuation caused by block 320 is -1.5dB.
As shown in figure 5, when switch element disconnects, since the isolation of switch element 322 is not 100%, so that
The portion radio frequency signal of RF receiving and transmission module 210 is coupled to detection module 330.The degree of coupling curve of coupling module 320 is song
Line.As frequency f=410.0MHz, the degree of coupling of coupling module 320 is -31.679dB, and the signal as caused by coupling module 320 declines
It is kept to -0.07dB.
Wherein, the absolute value of the degree of coupling of coupling module 320 is bigger, and the signal attenuation that it is introduced is smaller, detection module 330
Detect that the received signal strength of RF receiving and transmission module 310 is weaker.
The absolute value of signal attenuation is bigger, and detection module 330 detects that the received signal strength of RF receiving and transmission module 310 is got over
By force.
In such scheme, coupling resistance and switch element are set between RF receiving and transmission module and detection module, when
When detection module detects the received signal strength of RF receiving and transmission module, switching means conductive；After detection, switch element breaks
Open, so as to isolate RF receiving and transmission module and detection module, radio frequency signal attenuation caused by coupling module can be reduced, improve detection
Precision and receiving sensitivity.
Referring to Fig. 8, Fig. 8 is a kind of structure diagram of terminal provided by the embodiments of the present application.End in the present embodiment
End includes detection circuit 410, processor 420 and memory 430.Processor 420 distinguishes connection detection circuit 410 and storage
Device 430.Wherein, detection circuit 410 is the detection circuit described in any of the above-described embodiment, referring specifically in above-described embodiment
Associated description, do not repeat herein.
In above description, in order to illustrate rather than in order to limit, it is proposed that such as particular system structure, interface, technology it
The detail of class, to understand thoroughly the application.However, it will be clear to one skilled in the art that these are specific
The application can also be realized in the other embodiment of details.In other situations, omit to well-known device, circuit with
And the detailed description of method, in case unnecessary details hinders the description of the present application.
Claims (10)
1. a kind of detection circuit, the detection circuit includes RF receiving and transmission module, coupling module and detection module, the coupling
Module connects the RF receiving and transmission module and the detection module, it is characterised in that the coupling module includes coupling resistance
And switch element；
One end of the coupling resistance connects the RF receiving and transmission module, and the other end connection switch of the coupling resistance is single
The input terminal of member, the output terminal of the switch element connect the detection module；
The RF receiving and transmission module is used for transmission radiofrequency signal；
The coupling module is used to the radiofrequency signal that the RF receiving and transmission module receives being coupled to the detection module；
The detection module is used for the received signal strength for detecting the RF receiving and transmission module；
When detecting the received signal strength of the RF receiving and transmission module, the input terminal of the switch element and the switch element
Output terminal establish connection, the radiofrequency signal that the RF receiving and transmission module receives is coupled to the detection by the coupling module
Module, enables the detection module to detect the received signal strength of the RF receiving and transmission module；
When having detected the received signal strength of the RF receiving and transmission module, the input terminal of the switch element and the switch are single
The output terminal of member disconnects.
2. circuit according to claim 1, it is characterised in that the circuit further includes control module, the control module
The RF receiving and transmission module and the detection module are connected respectively, and the control module is used to detect according to the detection module
The intensity of the radiofrequency signal arrived adjusts the receiving sensitivity of the RF receiving and transmission module.
3. circuit according to claim 2, it is characterised in that the switch element further includes control terminal, and the switch is single
The control terminal of member connects the control module；
When detecting the received signal strength of the RF receiving and transmission module, the control module control the input terminal with it is described defeated
Outlet establishes connection；When having detected the received signal strength of the RF receiving and transmission module, the control module control is described defeated
Enter end to disconnect with the output terminal.
4. circuit according to claim 3, it is characterised in that the switch element includes electronic switch, the electronic cutting
Close as transistor or electronic analog swtich.
5. circuit according to claim 4, it is characterised in that the transistor is triode or field-effect tube.
6. circuit according to claim 5, it is characterised in that the switch element further includes current-limiting resistance, the current limliting
One end connection power supply of resistance, the other end of the current-limiting resistance connect the input terminal of the switch element.
7. circuit according to claim 6, it is characterised in that the switch element further includes the first choke coil, and described
One end of one choke coil connects the output terminal of the switch element, the other end ground connection of first choke coil.
8. circuit according to claim 7, it is characterised in that the input terminal of the switch element and the current-limiting resistance it
Between be also connected with the second choke coil.
9. circuit according to claim 8, it is characterised in that the switch element further includes the first divider resistance and
Two divider resistances, one end of first divider resistance connect the control module, and the other end of first divider resistance connects
The control terminal of the electronic switch is connect, the control terminal of the electronic switch is also connected with one end of second divider resistance, described
The other end ground connection of second divider resistance.
10. a kind of terminal, the terminal includes processor, memory, it is characterised in that the terminal is further included such as claim
1-9 any one of them detection circuits, the processor connect the memory and the detection circuit respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510292121.2A CN104967492B (en) | 2015-06-01 | 2015-06-01 | A kind of detection circuit and terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510292121.2A CN104967492B (en) | 2015-06-01 | 2015-06-01 | A kind of detection circuit and terminal |
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| CN104967492B true CN104967492B (en) | 2018-04-24 |
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| DE102010027620A1 (en) * | 2010-07-23 | 2012-01-26 | Funkwerk Dabendorf Gmbh | Coupling of an electronic device with a radio link, in particular a mobile phone, to devices of a motor vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1242127A (en) * | 1996-10-29 | 2000-01-19 | 三星电子株式会社 | Circuit for eliminating external interference signals in code division multiple access mobile phone |
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| CN101425680A (en) * | 2008-12-08 | 2009-05-06 | 中兴通讯股份有限公司 | Overdriving protection method and circuit |
| CN102496036A (en) * | 2011-11-16 | 2012-06-13 | 深圳市远望谷信息技术股份有限公司 | Antenna switching device for receiving and transmitting diversity and RFID (Radio Frequency Identification) reader-writer |
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