CN208285309U - A kind of transmission circuit, transmit-receive switch and mobile terminal - Google Patents
A kind of transmission circuit, transmit-receive switch and mobile terminal Download PDFInfo
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- CN208285309U CN208285309U CN201820360664.2U CN201820360664U CN208285309U CN 208285309 U CN208285309 U CN 208285309U CN 201820360664 U CN201820360664 U CN 201820360664U CN 208285309 U CN208285309 U CN 208285309U
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Abstract
The utility model relates to a kind of transmission circuit, transmit-receive switch and mobile terminal, which includes: transmitting terminal and receiving end, further includes: for sending transmitting signal or receiving the antenna of radiofrequency signal；It is sent to antenna with antenna and transmitting terminal, for receiving transmitting signal and signal being emitted respectively and is used to offset the transmitting path that antenna meets with the negative voltage generated when strong signal interference；It connect respectively with antenna and receiving end, meet with the receiving path of negative voltage generated when strong signal interference for receiving radiofrequency signal and radiofrequency signal being sent to receiving end and is used to offset antenna.The utility model can effectively offset generated negative voltage when meeting with strong signal interference, receive and dispatch signal normally, and can improve the index of transmitting harmonic wave, circuit structure and simply, easily realize, is at low cost.
Description
Technical field
The utility model relates to the communications fields, eventually more specifically to a kind of transmission circuit, transmit-receive switch and movement
End.
Background technique
Transmit-receive switch is broadly divided into two kinds at present: integrated chip and discrete device, wherein integrated chip transmit-receive switch performance
It is good but expensive.And the transmit-receive switch built using traditional discrete device, price is relatively cheap, but traditional deviding device
The transmit-receive switch that part is built is unable to normal transmission under strong signal interference.
For example, realizing the transceiver insulation of intercom generally by diode, that is, when emitting in existing intercom industry
Power supply electrifying, diode current flow, transmission power output end reach antenna by diode, carry out the power of receiving end very at this time
It is faint.When receiving, power supply is not powered on, and diode does not turn on as switch, at this point, since diode is in reversed cut-off shape
State flows mostly to receiving end from antenna received signal, into reception channel.However, there are a drawbacks for the technical solution, i.e.,
It is unable to normal boot-strap transmitting under strong signal interference, influences the normal transmitting-receiving of product, greatly reduces the performance and competition of product
Power.
Utility model content
The technical problem to be solved by the present invention is to above-mentioned for the prior art cannot be just under strong signal interference
The defect of normally opened machine transmitting provides a kind of transmission circuit, transmit-receive switch and mobile terminal.
The technical scheme adopted by the utility model to solve the technical problem is as follows: constructing a kind of transmission circuit, including transmitting
End and receiving end, further includes:
For sending transmitting signal or receiving the antenna of radiofrequency signal；
It is connect respectively with the antenna and the transmitting terminal, for receiving the transmitting signal and sending out the transmitting signal
Send to the antenna and meet with for offsetting the antenna transmitting path of the negative voltage generated when strong signal interference；
It is connect respectively with the antenna and the receiving end, for receiving the radiofrequency signal and sending out the radiofrequency signal
Send to the receiving end and meet with for offsetting the antenna receiving path of the negative voltage generated when strong signal interference.
Preferably, further includes:
It is connect respectively with the transmitting terminal and the transmitting path, for providing the confession of supply voltage to the transmitting path
Circuit.
Preferably, the power supply circuit include isolation inductance, one termination power of isolation inductance, the other end respectively with institute
Transmitting terminal is stated to connect with the transmitting path.
Preferably, the transmitting path includes diode D7002 and diode D9002；
The anode of the diode D7002 is connect with the transmitting terminal, the anode of the diode D7002 and the transmitting
The connecting node at end also passes through the isolation inductance and connects power supply, and the cathode of the diode D7002 is connected to the antenna；
The anode of the diode D9002 is connect with the cathode of the diode D7002, the yin of the diode D9002
Pole is connect with the anode of the diode D7002.
Preferably, the diode D7002 is identical as the diode D9002.
Preferably, the receiving path includes conducting inductance, diode D7004 and diode D9003；
Described conducting inductance one end is connect with the connecting node of the diode D7002 and the antenna, the electric conduction
Feel the other end to be grounded by the diode D7004, the connecting node of the conducting inductance and the diode D7004 is also connected with
To the receiving end；
The cathode of the diode D9003 is connect with the anode of the diode D7004, the sun of the diode D9003
Pole is connect with the cathode of the diode D7004.
Preferably, the diode D7004 is identical as the diode D9003.
The utility model also provides a kind of transmit-receive switch, including above-described transmission circuit.
The utility model also provides a kind of mobile terminal, including above-described transmission circuit.
The transmission circuit for implementing the utility model, has the advantages that the transmission circuit of the utility model is not changing
Become on the basis of original circuit structure overall plan, using symmetrical principle of cancellation, can effectively be supported when meeting with strong signal interference
Disappear generated negative voltage, receives and dispatches signal normally, solves existing product and is unable to normal transmission under strong signal interference
The problem of, while the index of transmitting harmonic wave, circuit structure also can be improved and simply, easily realize, is at low cost.
Detailed description of the invention
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:
Fig. 1 is a kind of logic diagram of transmission circuit provided by the embodiment of the utility model；
Fig. 2 is a kind of circuit signal of the transmission circuit provided by the embodiment of the utility model from product antenna opening to transmitting-receiving mouth
Figure；
Fig. 3 is the waveform diagram before improving with TX to ANT after improvement；
Fig. 4 is the waveform diagram before improving with ANT to RX after improvement.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing carries out
It is described in detail.
As shown in Figure 1, the utility model provides a kind of transmission circuit, which can be under strong signal interference
When, eliminate strong signal using symmetrical principle of cancellation and interfere the lower negative voltage generated, can under strong signal interference normal transmission,
Solve the problems, such as what the interference of existing product strong signal cannot emit down.
Specifically, as shown in Figure 1, the transmission circuit of the utility model embodiment may include transmitting terminal and receiving end, day
Line, the transmitting path 10 being connected between transmitting terminal and antenna and the receiving path 20 being connected between antenna and receiving end.
Wherein, antenna can be used for sending transmitting signal or receive radiofrequency signal, i.e., when needing to emit signal, antenna is then
For the received transmitting signal of institute to be launched；When emitting without signal, if there is signal access, antenna be then used for by
The rf signal reception accessed is come in, and is transmitted to receiving end by receiving path 20, is penetrated by receiving end by institute is received
The access of frequency signal receives channel.
In the utility model embodiment, transmitting path 10 can be used for receiving the transmitting signal of transmitting terminal output, and should
Transmitting signal is sent to antenna, is launched signal by antenna.Further, which can also offset antenna
Meet with the transmitting path 10 of the negative voltage generated when strong signal interference.It is to be appreciated that the transmitting path 10 can be original
On the basis of transmitting path 10, a backward dioded in parallel, and when being interfered strong signal using the principle realization symmetrically offset
The negative voltage of generation balances out.In a specific embodiment, as shown in Fig. 2, the transmitting path 10 may include diode
D7002 and diode D9002.Diode D7002 is connected when transmitting signals, and passes through diode D7002 for transmitting terminal
(TX) the transmitting signal exported is transmitted to antenna (ANT), and when receiving external radiofrequency signal, diode D7002 is then in anti-
To off state, it is not turned on.Diode D9002 is then used to offset the lower generated negative voltage of strong signal interference.Specifically, as schemed
Shown in 2, when emitting signal, when antenna (ANT) suffers from strong signal interference, is produced from the left side (i.e. anode tap) of diode D7002
A raw negative voltage, at this point, can be balanced out the negative voltage, due to the symmetrical negative function of diode D9002 so as to ensure
It can be emitted with normal boot-strap.
Alternatively, the diode D7002 and diode D9002 of the utility model are identical diode, by using
Identical diode, and then using symmetrical principle of cancellation to offset the lower generated negative voltage of strong signal interference.Wherein, such as Fig. 2
Shown, diode D9002 and diode D7002 is the symmetrical structure of reverse parallel connection.Specifically, the anode of diode D7002 with
Transmitting terminal connection, the anode of diode D7002 also passes through with the connecting node of transmitting terminal is isolated inductance and connects power supply, diode
The cathode of D7002 is connected to antenna；The anode of diode D9002 is connect with the cathode of diode D7002, diode D9002's
Cathode is connect with the anode of diode D7002.
Further, the transmission circuit of the utility model embodiment can also include power supply circuit 30, the power supply circuit 30
It is connect respectively with transmitting terminal and transmitting path 10, for providing supply voltage to transmitting path 10.In addition, the power supply circuit 30 is also
For providing supply voltage to receiving path 20.In a specific embodiment, when transmitting signals, the output of power supply circuit 30 supplies
Piezoelectric voltage, the supply voltage are transmitted to transmitting path 10 and receiving path 20, at this point, transmitting path 10 and receiving path 20 are led
Logical, the radiofrequency signal of transmitting terminal output can be transmitted to antenna by transmitting path 10.It is to be appreciated that when transmitting signals, when
When antenna meets with strong signal interference, due to being provided with bucking circuit (diode D9002 as the aforementioned) in transmitting path 10, it can incite somebody to action
Negative voltage caused by strong signal interference is lower balances out, the supply voltage that power supply circuit 30 generates can normal transmission to transmitting path
10, so ensure strong signal interference under can still be emitted with normal boot-strap.
Alternatively, the power supply circuit 30 may include isolation inductance, be isolated one termination power of inductance, the other end respectively with
Transmitting terminal and transmitting path 10 connect.In a specific embodiment, power supply circuit 30 includes isolation inductance L9034, wherein every
From mono- termination power of inductance L9034 (Vcc), the sun of inductance L9034 other end difference transmitting terminal (TX) and diode D7002 is isolated
Pole connection.It can be made by the way that inductance L9034 is isolated with setting between transmitting terminal and the anode of diode D7002 in power supply (Vcc)
The supply voltage of power supply (Vcc) output can smoothly be transferred to diode D7002.Specifically, when transmitting signals, power supply (Vcc)
It powers on, since the logical friendship blocking performance of inductance L9034 is isolated, the transmitting signal (AC signal) of transmitting terminal (TX) output will not be into
Enter power supply (Vcc), the supply voltage of power supply (Vcc) output can smoothly be transmitted to diode after inductance L9034 is isolated
D7002, diode D7002 conducting, and then by the transmitting signal of transmitting terminal (TX) output by being transmitted to day after diode D7002
Line (ANT) is launched by antenna (ANT) by signal is emitted.
In the utility model embodiment, receiving path 20 can be used for the received radiofrequency signal of receiving antenna institute, and should
Radiofrequency signal is sent to receiving end.In addition, the receiving path 20 can be also used for offsetting generation when antenna meets with strong signal interference
Negative voltage, it is ensured that can normal boot-strap transmitting.It is to be appreciated that the receiving path 20 can be in the base of original receiving path 20
On plinth, a backward dioded in parallel, and realize that the negative voltage generated when interfering strong signal supports using the principle symmetrically offset
Disappear.In a specific embodiment, as shown in Fig. 2, the receiving path 20 may include conducting inductance, diode D7004 and
Diode D9003.Diode D7004 and diode D9003 are connected when transmitting signals, end when receiving signal.Wherein, two
Pole pipe D9003 generates negative function when transmitting signals.Specifically, as shown in Fig. 2, transmitting signal when, when antenna (ANT) meet with
To when strong signal interference, the anode tap of diode D7004 also generates a negative voltage, at this point, symmetrically supporting due to diode D9003
Disappear effect, can balance out the negative voltage, so that it is guaranteed that can be emitted with normal boot-strap.
Alternatively, the diode D7004 and diode D9003 of the utility model are identical diode.By using
Identical diode, and symmetrical principle of cancellation is utilized, the lower generated negative voltage of strong signal interference can be completely counterbalanced by.Wherein,
As shown in Fig. 2, diode D9003 and diode D7004 is the symmetrical structure of reverse parallel connection.
In a specific embodiment, as shown in Fig. 2, the company of the conducting one end inductance L9035 and diode D7002 and antenna
Node connection is connect, the conducting inductance L9035 other end is grounded by diode D7004, conducting inductance L9035 and diode D7004
Connecting node be additionally coupled to receiving end (RX)；The cathode of diode D9003 is connect with the anode of diode D7004, diode
The anode of D9003 is connect with the cathode of diode D7004.It is to be appreciated that electricity can be made by the effect of conducting inductance L9035
The signal on road meets normal circuit requirements, and signal can normally circulate.Wherein, the electric conduction in the transmission circuit of the utility model
The inductance value for feeling L9035 is less than the inductance value of isolation inductance L9034.It is to be appreciated that when receiving radiofrequency signal, due to power supply
(Vcc) it not powering on, diode D7002, diode D9002, diode D7004 and diode D9003 are in off state,
The received radiofrequency signal of antenna (ANT) institute flows directly into receiving end (RX) after inductance L9035 is connected, and radiofrequency signal enters reception
Channel.
The transmission circuit of the utility model is diverted from one use to another and is symmetrically supported on the basis of not changing original circuit structure overall plan
Disappear principle, respectively in diode D7002 and diode D7004 one diode of each reverse parallel connection (D9002 and D9003), effectively
Ground generated negative voltage will be balanced out when emitting signal and antenna meets with strong signal interference, be solved existing product and be believed by force
The problem of number interfering lower non-emissive.
In addition, by after each identical backward dioded in parallel of diode D7002 and diode D7004, transmitting
Hold (TX) not increasing with interior Insertion Loss to antenna (ANT) and antenna (ANT) to the antenna of receiving end (RX).Specific such as Fig. 3 and Fig. 4
Shown, Fig. 3 is to improve the preceding waveform diagram with TX to ANT after improvement, and Fig. 4 is the waveform diagram before improving with ANT to RX after improvement.By
Fig. 3 and Fig. 4, which can be seen that, to be improved the waveform of front and back and almost coincides together, that is, after improving transmitting terminal (TX) to antenna (ANT) and
The antenna of antenna (ANT) to receiving end (RX) do not increase with interior Insertion Loss.
Further, machine sensitivity and power do not deteriorate after improvement, and diode uses mutual symmetry structure, using mutual
Itself non-sheerly distortion component can be offset by mending symmetrical structure diode, improve whole non-linear, while can also improve hair
Penetrate the index of harmonic wave.Shown in table specific as follows:
After improving it can be seen from table, whole sensitivity and power do not deteriorate, and improved radio-frequency harmonic
Index is above the radio-frequency harmonic index of original scheme, and transmitting-receiving performance is more preferable.
The utility model additionally provides a kind of transmit-receive switch, including above-described transmission circuit.
The utility model additionally provides a kind of mobile terminal, including above-described transmission circuit.Wherein, mobile terminal example
It such as include but is not limited to mobile phone, intercom.
Above embodiments are only to illustrate the technical ideas and features of the present invention, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the protection scope of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims range is done, should belong to the utility model claims covers model
It encloses.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.
Claims (7)
1. a kind of transmission circuit, including transmitting terminal and receiving end, which is characterized in that further include:
For sending transmitting signal or receiving the antenna of radiofrequency signal；
It is connect respectively with the antenna and the transmitting terminal, for receiving the transmitting signal and being sent to the transmitting signal
The antenna and the transmitting path that the negative voltage generated when strong signal interference is met with for offsetting the antenna；
The transmitting path includes diode D7002 and diode D9002；
The anode of the diode D7002 is connect with the transmitting terminal, anode and the transmitting terminal of the diode D7002
Connecting node also passes through isolation inductance and connects power supply, and the cathode of the diode D7002 is connected to the antenna；
The anode of the diode D9002 is connect with the cathode of the diode D7002, the cathode of the diode D9002 with
The anode of the diode D7002 connects；
It is connect respectively with the antenna and the receiving end, for receiving the radiofrequency signal and being sent to the radiofrequency signal
The receiving end and the receiving path that the negative voltage generated when strong signal interference is met with for offsetting the antenna；
The receiving path includes conducting inductance, diode D7004 and diode D9003；
Described conducting inductance one end is connect with the connecting node of the diode D7002 and the antenna, and the conducting inductance is another
One end is grounded by the diode D7004, and the connecting node of the conducting inductance and the diode D7004 are additionally coupled to institute
State receiving end；
The cathode of the diode D9003 is connect with the anode of the diode D7004, the anode of the diode D9003 with
The cathode of the diode D7004 connects.
2. transmission circuit according to claim 1, which is characterized in that further include:
It is connect respectively with the transmitting terminal and the transmitting path, for providing the power supply electricity of supply voltage to the transmitting path
Road.
3. transmission circuit according to claim 2, which is characterized in that the power supply circuit includes the isolation inductance, institute
Isolation one termination power of inductance is stated, the other end is connect with the transmitting terminal and the transmitting path respectively.
4. transmission circuit according to claim 1, which is characterized in that the diode D7002 and diode D9002
It is identical.
5. transmission circuit according to claim 1, which is characterized in that the diode D7004 and diode D9003
It is identical.
6. a kind of transmit-receive switch, which is characterized in that including the described in any item transmission circuits of claim 1-5.
7. a kind of mobile terminal, which is characterized in that including the described in any item transmission circuits of claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820360664.2U CN208285309U (en) | 2018-03-16 | 2018-03-16 | A kind of transmission circuit, transmit-receive switch and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820360664.2U CN208285309U (en) | 2018-03-16 | 2018-03-16 | A kind of transmission circuit, transmit-receive switch and mobile terminal |
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| Publication Number | Publication Date |
|---|---|
| CN208285309U true CN208285309U (en) | 2018-12-25 |
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ID=64749573
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820360664.2U Active CN208285309U (en) | 2018-03-16 | 2018-03-16 | A kind of transmission circuit, transmit-receive switch and mobile terminal |
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| CN (1) | CN208285309U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412636A (en) * | 2018-12-29 | 2019-03-01 | 维沃移动通信有限公司 | A kind of wireless transmitter and mobile terminal |
-
2018
- 2018-03-16 CN CN201820360664.2U patent/CN208285309U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412636A (en) * | 2018-12-29 | 2019-03-01 | 维沃移动通信有限公司 | A kind of wireless transmitter and mobile terminal |
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