CN207691793U - A kind of wifi systems - Google Patents
A kind of wifi systems Download PDFInfo
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- CN207691793U CN207691793U CN201721133639.2U CN201721133639U CN207691793U CN 207691793 U CN207691793 U CN 207691793U CN 201721133639 U CN201721133639 U CN 201721133639U CN 207691793 U CN207691793 U CN 207691793U
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- wifi
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The utility model embodiment discloses a kind of wifi systems, which includes wifi chip, sample circuit, selection circuit, signal transmitting path, signal receiving path and antenna；Signal transmitting path, signal receiving path and wifi chip respectively constitute wifi transmission channels and wifi receiving channels；The output signal of control circuit is controlled by the sampled signal of sample circuit, and then is connected using one of output signal selection wifi transmission channels and the wifi receiving channels of control circuit, and another disconnection.Corresponding transmitting/reception pulse is extracted from the operating current of wifi chip by sample circuit, utilize the turn-on and turn-off of the transmitting/reception Pulse Width Control wifi transmission channels and wifi receiving channels, while capable of realizing that wifi is transmitted at a distance, the power consumption of wifi systems is reduced.
Description
Technical field
The utility model embodiment is related to wireless communication technology field, more particularly to a kind of wifi systems.
Background technology
The exploitation of wifi systems at present is generally using being integrated with chip underlying protocol, physical layer and radio frequency unit in one
The single-chip of body.Chip only exports radiofrequency signal, and without extra output interface, transmitting-receiving switching is controlled by physical layer.General chip
Maximum transmission power is 15dBm or so, it is difficult to realize remote transmission.It, need to be in core to realize the remote transmission of wifi systems
Power amplifier is connected outside piece, but the manufacturer of chip underlying protocol and physical layer does not often open to the outside world, can not pass through software control
Radio-frequency front-end transmitting-receiving switching processed is synchronous with chip transmitting-receiving switching.
In the prior art, what the radiofrequency signal and antenna that generally use circulator or combiner emit wifi chip received
Radiofrequency signal is divided into two-way, and then realizes the duplex of wifi systems, but this mode cost is larger, and power amplifier needs often
It opens, power consumption is larger, waste of resource.Further, it is also possible to the duplex by detaching radiofrequency signal and base band realization wifi systems, but electricity
Line structure is relative complex, and circuit level is relatively low, and cost is higher.
Utility model content
The utility model embodiment provides a kind of wifi systems, can expand the transmission range of the wifi signals of wifi systems
While reduce cost.
In order to solve the above technical problems, the technical solution that the utility model embodiment uses is：A kind of wifi is provided
System, including wifi chip, sample circuit, selection circuit, signal transmitting path, signal receiving path and antenna；
The signal input part of the signal transmitting path connect with the signal end of the wifi chip, signal output end and institute
Antenna connection is stated, to form wifi transmission channels；The letter of the signal output end and the wifi chip of the signal receiving path
Number end connection, signal input part connect with the antenna, to form wifi receiving channels；
The power end of the wifi chip is connect with power supply；
The input terminal of the sample circuit is connect with the power supply, output end is connect with the control terminal of the selection circuit,
Associated electrical signals for exporting the power end；
The selection circuit is set in the wifi transmission channels and the wifi receiving channels, for according to the electricity
The associated electrical signals of source select one of the wifi transmission channels and the wifi receiving channels to connect, and another
It disconnects.
Wherein, the sample circuit includes sampling resistor and comparator；It is adopted described in the power end connection of the wifi chip
The other end of the first input end of one end of sample resistance and the comparator, the sampling resistor connects the power supply, the ratio
Compared with the second input terminal input reference voltage of device, the output end of the comparator connects institute as the output end of the sample circuit
State the control terminal of selection circuit.
Wherein, the selection circuit includes first switch, and the signal end of the wifi chip connects the first switch
Non-moving end, the first moved end and the second moved end of the first switch be separately connected the signal transmitting path signal input part and
The signal output end of the signal receiving path, the control terminal of the first switch are connect with the output end of the sample circuit.
Wherein, further include the first bandpass filter, signal end connection first bandpass filter of the wifi chip
Input terminal, the output end of first bandpass filter connects the non-moving end of the first switch.
Wherein, the selection circuit includes second switch, and the antenna connects the non-moving end of the second switch, and described
The first moved end and the second moved end of two switches are separately connected the signal output end of the signal transmitting path and the signal receives
The signal input part of access, the control terminal of the second switch are connect with the output end of the sample circuit.
Wherein, further include a capacitance, the power end of the wifi chip connects one end of the capacitance, the capacitance it is another
One end is grounded.
Wherein, the signal transmitting path includes a power amplifier, and the signal receiving path is put including a low noise
Big device；
The input terminal of the power amplifier is connected to institute as signal input part, the output end of the signal transmitting path
State the signal output end of signal transmitting path, control terminal is connect with the output end of the sample circuit；
The output end of the low-noise amplifier is connected to as signal output end, the input terminal of the signal receiving path
The signal input part of the signal receiving path, control terminal are connect with the output end of the sample circuit.
Wherein, the signal transmitting path further includes a high-pass filter, and the output end of the power amplifier connects institute
State the input terminal of high-pass filter, the signal output end of the output end of the high-pass filter as the signal transmitting path.
Wherein, the signal receiving path further includes the second bandpass filter, and the input terminal of the low-noise amplifier connects
The output end of second bandpass filter is connect, the input terminal of second bandpass filter is as the signal receiving channel
Signal input part.
Wherein, the sample circuit, selection circuit, signal transmitting path and signal receiving path delay value and be less than
Or the delay requirement that wifi signals are received and/or are sent equal to wifi agreements.
It is different from the prior art, the advantageous effect of the utility model embodiment is：It is provided in the utility model embodiment
Wifi systems when emitting from wifi chip by sample circuit and receive signal power supply be supplied to the operating current of wifi chip
Middle proposition is corresponding to emit and receives pulse, utilizes the transmitting and receives Pulse Width Control wifi transmission channels and wifi receiving channels
Turn-on and turn-off, when wifi transmission channels are connected, wifi receiving channels disconnect；When wifi receiving channels are connected, wifi
Transmission channel disconnects, and so can the radiofrequency signal that the radiofrequency signal and antenna that wifi chip emits receive be divided into two-way, expanded
The transmission range of big wifi signals, simultaneously because the conducting of wifi transmission channels and wifi receiving channel selectivity and reduce cost
And power consumption, the wifi system structures of the utility model embodiment are simple in addition, can realize higher integrated level.
Description of the drawings
Fig. 1 is the structural schematic diagram of one embodiment of wifi systems provided by the utility model；
Fig. 2 a- Fig. 2 b are the structural schematic diagrams of the setting embodiment of selection circuit in wifi systems shown in FIG. 1；
Fig. 3 is the structural schematic diagram of another embodiment of wifi systems provided by the utility model；
Fig. 4 is the structural schematic diagram of the another embodiment of wifi systems provided by the utility model；
Fig. 5 is the structural schematic diagram of wifi systems another embodiment provided by the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is the structural schematic diagram of one embodiment of wifi systems provided by the utility model.Such as Fig. 1 institutes
Show, the wifi systems of the present embodiment include wifi chip, sample circuit, selection circuit, signal transmitting path, signal receiving path
And antenna.Wherein, the signal input part of the signal transmitting path and signal end of wifi chip connection, signal output end and antenna connect
It connects, to form wifi transmission channels；The signal output end and the signal end connection of wifi chip, signal of signal receiving path input
End is connect with antenna, and to form wifi receiving channels, the power end of wifi chip is connect with power supply；The input terminal of sample circuit with
The control terminal of power supply connection, output end and selection circuit connects, and is used for the associated electrical signals at out-put supply end.Selection circuit is arranged
In wifi transmission channels and wifi receiving channels, for according to the associated electrical signals of power end select wifi transmission channels and
One of wifi receiving channels are connected, and another is disconnected.
In the present embodiment, selection circuit can be arranged wifi chip and signal transmitting path and signal receiving path it
Between, as shown in Figure 1.In addition, as shown in Figure 2 a and 2 b, in the other embodiment of the utility model, selection circuit can also
It is arranged between antenna and signal transmitting path and signal receiving path, or in wifi chip and signal transmitting path and signal
It is both provided with selection circuit between receiving path, between antenna and signal transmitting path and signal receiving path.
Same wifi chip is different with the operating current received under two kinds of working conditions of wifi signals in transmitting wifi signals
And difference is larger, for example, enabling the supply voltage of power supply offer 3.3V, operating current of the wifi chip when receiving signal is
56mA, operating voltage are 3.0V~3.6V；Wifi chip is when sending signal, operating current 170mA, and operating voltage is
3.0V~3.6V；It can be seen that operating current of the wifi chip when sending wifi signals is far longer than wifi chip reception
Operating current when wifi signals.The utility model embodiment is then the work electricity under different working condition according to wifi chip
Stream is different, extracts transmitting/reception pulse (T/ of wifi chip from the mutation of wifi chip operating current using sample circuit
R pulses).When wifi chip is in the state of transmitting wifi signals, operating current is larger, the output end of sample circuit then phase
High level should be exported, which is input to the control terminal of selection circuit, the high level for enabling selection circuit be inputted according to control terminal
Communications signals transmitting path is selected, signal receiving path is simultaneously switched off, at this point, wifi systems are then operated in wifi signal emitting shapes
State, and signal receiving path is to disconnect, and does not need power consumption.When wifi chip is in the state for receiving wifi signals,
Its operating current is smaller, and the output end of sample circuit then accordingly exports low level, which is input to the control of selection circuit
End enables selection circuit select communications signals receiving path according to the low level that control terminal inputs, simultaneously switches off signal transmission path,
At this point, wifi systems are then operated in wifi signal reception states, and signal transmitting path is to disconnect, and does not need power consumption.
The wifi systems of the present embodiment can save while can expanding the transmission range of wifi chip transmitting wifi signals
Power consumption is saved, while the wifi system structures are simple, convenient for integrated.
Referring to Fig. 3, Fig. 3 is the structural schematic diagram of another embodiment of wifi systems provided by the utility model.Such as Fig. 3 institutes
Show, the sample circuit of the present embodiment includes sampling resistor R and comparator, and the power end of wifi chip connects the one of sampling resistor R
The other end of the first input end at end and comparator, sampling resistor R connects power supply, and the second input terminal input of comparator is with reference to electricity
Pressure, the output end of comparator connect the control terminal of selection circuit as the output end of sample circuit.
First input end is inputted the first input end of the voltage value input comparator of extraction, comparator by sampling resistor R
Voltage value be compared with the reference voltage that the second input terminal inputs, corresponding level signal is exported according to comparison result, should
Level signal is the control signal of control circuit.It is worth noting that, the present embodiment inputs the second input terminal of comparator
The specific number of reference voltage be not specifically limited, but the numerical value of reference voltage needs to be more than wifi chip and emits wifi signals
When sampling resistor R extraction voltage value, and when receiving wifi signals less than wifi chip sampling resistor R extractions voltage value, with
Different comparison results is obtained when comparator being enable to be compared from the sampling resistor R voltage values extracted using reference voltage.
Specifically, when wifi chip is in the state of transmitting wifi signals, operating current is larger, and sampling resistor R is carried
Take and the voltage value of the first input end of input comparator be smaller, the voltage value of the first input end of comparator input be less than its
Two input terminals input reference voltage, then comparator output end export high level.Wifi signals are received when wifi chip is in
State when, operating current is smaller, and the voltage value of sampling resistor R extraction and the first input end of input comparator is larger, than
Compared with the reference voltage that the voltage value that the first input end of device inputs is more than the input of its second input terminal, then the output end of comparator is defeated
Go out low level.
In addition, comparator has certain stagnant section of whirling, the anti-noise jamming ability of wifi systems can be enhanced, made entire
Circuit structure is more stablized.
It is understood that extraction of the sample circuit for the operating current according to wifi chip different working condition is corresponding
Voltage signal, in wifi systems provided by the utility model, as long as sample circuit can realize the function, Fig. 3 institutes
Only as an implementation, others may be used in sample circuit to the structure of the sample circuit shown in other implementations
Structure, the utility model do not limit.
Further, as shown in figure 3, the wifi systems of the present embodiment further include a capacitance C, the power end of wifi chip connects
Connect one end of capacitance C, and the other end ground connection of capacitance C.The power end in wifi chip is arranged in capacitance C, has filtering
Effect.The present embodiment does not limit the capacitance of capacitance C, can be accordingly arranged according to specific demand, optionally,
The capacitance of capacitance C is in 90pF between 110pF.
Fig. 3 is further regarded to, switching circuit may be used in the selection circuit of the present embodiment, as shown in figure 3, in the embodiment
Selection circuit includes first switch K1, the non-moving end of the signal end connection first switch K1 of wifi chip, and the of first switch K1
One moved end a and the second moved end b is separately connected the signal output end of the signal input part and signal receiving path of signal transmitting path,
The control terminal of first switch K1 and the output end of sample circuit connect.
In the present embodiment, selection circuit includes first switch K1, the level signal control of the output end output of sample circuit
The shutdown situation of first switch K1.When sample circuit exports high level, connection signal transmitting path in first switch K1
Side is connected, and the other side disconnects, and is accordingly connected signal transmitting path, and signal receiving path disconnects；When sample circuit exports
When low level, the side conducting of connection signal receiving path, the other side disconnect in first switch K1, accordingly receive signal logical
Road is connected, and signal transmitting path disconnects.
Further, as shown in figure 3, selection circuit can also include second switch K2, the operation principle of second switch K2
Identical as first switch K1, details are not described herein again.It is understood that in the wifi systems of the present embodiment, selection circuit can be with
First switch or second switch are only included, can also include first switch and the second switch simultaneously.In addition, first switch and/or
Second switch can be single-pole double-throw switch (SPDT) or double-point double-throw switch.
It is worth noting that, in wifi systems provided by the utility model, the effect of selection circuit is according to sample circuit
The level signal selection Continuity signal transmitting path or signal receiving path of output, therefore selection circuit may be used also in the wifi systems
To use the electronic components such as selector or other circuit structures, the utility model to be not construed as limiting this.
Further, as shown in figure 3, the wifi systems of the present embodiment further include the first bandpass filter 10, wifi chip
Signal end connect the input terminal of the first bandpass filter 10, the output end connection first switch K1 of the first bandpass filter is not
Moved end is not (if it is understood that include first switch K1, the input terminal and signal of the first bandpass filter in selection circuit
The input terminal of transmitting path, the output end connection of signal receiving path.).
The first bandpass filter 10 is set in the signal end of wifi chip, the input of spurious signal can be inhibited, reduced miscellaneous
Scattered signal is sent out to wifi chip and the interference of received signal.
Referring to Fig. 4, Fig. 4 is the structural schematic diagram of the another embodiment of wifi systems provided by the utility model.Such as Fig. 4 institutes
Show, signal transmitting path includes a power amplifier 20, and signal receiving path includes a low-noise amplifier 30；Power amplifier
20 input terminal be connected to as signal input part, the output end of signal transmitting path signal transmitting path signal output end,
The output end of control terminal and sample circuit connects.The output end of low-noise amplifier 30 is exported as the signal of signal receiving path
End, input terminal are connected to the output end connection of the signal input part, control terminal and sample circuit of signal receiving path.
In the present embodiment, the power amplifier 20 in signal transmitting path is used for when wifi chip emits wifi signals,
Wifi signals are amplified and be transmitted to antenna, and then expand the transmission range of wifi chip transmitting wifi signals.Signal receives logical
The low-noise amplifier 30 of road is used to, when wifi chip receives wifi signals, the wifi signals that antenna receives be put
It is big and be sent to wifi chip and demodulated, so that the wifi signals that wifi chip receives will not be too small.
Further, referring to Fig. 5, Fig. 5 is the structural representation of wifi systems another embodiment provided by the utility model
Figure.As shown in figure 5, signal transmitting path further includes a high-pass filter 40, the output end connection high pass filter of power amplifier 20
The input terminal of wave device 40, the signal output end of the output end of high-pass filter 40 as signal transmitting path.Signal receiving path
Further include the second bandpass filter 50, the input terminal of low-noise amplifier 30 connects the output end of the second bandpass filter 50, the
Signal input part of the input terminal of two band-pass filter 50 as signal receiving channel.
High-pass filter in signal transmitting path inhibits hair of the power amplifier harmonic wave to wifi chip for filtering power amplifier harmonic wave
Penetrate the interference of signal.The second bandpass filter in signal receiving path can inhibit the input of spurious signal, reduce spuious letter
Interference number to wifi chip received signal.
It is understood that in the wifi systems of the utility model, the high-pass filter in signal transmitting path and signal
The second bandpass filter in receiving path can not have to while be arranged.
Further, since to the reception of wifi signals and/or being sent with delay requirement, i.e., in wifi systems in wifi agreements
The delay time of reception and/or the transmission of wifi signals cannot be more than reception and/or transmission in wifi agreements to wifi signals
It is required that delay time threshold value.Existing wifi agreements require the delay of reception and/or the transmission of wifi signals to be 2 μ s, because
Sample circuit, selection circuit, signal transmitting path and the signal receiving path of delay can be brought in this utility model embodiment
Delay value and be less than or equal to 2 μ s.Due to the development with the communication technology, wifi agreements can also change, i.e. wifi
The delay requirement of reception and/or the transmission of signal can may also change, therefore the delay time of the utility model embodiment
It is also required to be adjusted correspondingly according to the variation of wifi agreements.
Further, the emission peak power of the wifi systems of the utility model embodiment is 32dBm, orthogonal frequency division multiplexing
Peak-to-average force ratio 8dB, transmitting mean power be 24dBm, data rate be 1~40Mbps, receiving sensitivity be (- 82dbm,
20Mbps), maximum transmission distance 2km, total power consumption that emits is (950mA, 3.6V), and total power consumption that receives is (90mA, 3.6V).
To sum up, it should be readily apparent to one skilled in the art that the wifi systems that the utility model embodiment is provided pass through sampling
When circuit emits from wifi chip and receives signal power supply be supplied in the operating current of wifi chip propose corresponding transmitting and
Pulse is received, using the turn-on and turn-off of the transmitting and reception Pulse Width Control wifi transmission channels and wifi receiving channels, thus
It realizes the transmission range for expanding wifi signals, while reducing the effect of cost and power consumption, the utility model embodiment is carried in addition
The wifi system structures of confession are simple, can realize higher integrated level.
The foregoing is merely the embodiments of the utility model, and it does not limit the scope of the patent of the present invention, all
It is equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, directly or indirectly uses
In other related technical areas, it is equally included in the patent within the scope of the utility model.
Claims (10)
1. a kind of wifi systems, which is characterized in that including wifi chip, sample circuit, selection circuit, signal transmitting path, letter
Number receiving path and antenna；
The signal input part of the signal transmitting path connect with the signal end of the wifi chip, signal output end and the day
Line connects, to form wifi transmission channels；The signal end of the signal output end and the wifi chip of the signal receiving path
Connection, signal input part are connect with the antenna, to form wifi receiving channels；
The power end of the wifi chip is connect with power supply；
The input terminal of the sample circuit is connect with the power supply, output end is connect with the control terminal of the selection circuit, is used for
Export the associated electrical signals of the power end；
The selection circuit is set in the wifi transmission channels and the wifi receiving channels, for according to the power end
Associated electrical signals select one of the wifi transmission channels and described wifi receiving channels to connect, and another breaks
It opens.
2. wifi systems according to claim 1, which is characterized in that the sample circuit includes sampling resistor and compares
Device；The power end of the wifi chip connects the first input end of one end and the comparator of the sampling resistor, described to adopt
The other end of sample resistance connects the power supply, the second input terminal input reference voltage of the comparator, the comparator it is defeated
Outlet connects the control terminal of the selection circuit as the output end of the sample circuit.
3. wifi systems according to claim 1, which is characterized in that the selection circuit includes first switch, described
The signal end of wifi chip connects the non-moving end of the first switch, the first moved end of the first switch and the second moved end difference
The signal output end of the signal input part and the signal receiving path of the signal transmitting path is connected, the first switch
Control terminal is connect with the output end of the sample circuit.
4. wifi systems according to claim 3, which is characterized in that further include the first bandpass filter, the wifi cores
The signal end of piece connects the input terminal of first bandpass filter, the output end connection of first bandpass filter described the
The non-moving end of one switch.
5. wifi systems according to claim 1, which is characterized in that the selection circuit includes second switch, the day
Line connects the non-moving end of the second switch, and the first moved end and the second moved end of the second switch are separately connected the signal hair
The signal input part of the signal output end and the signal receiving path of access is penetrated, the control terminal of the second switch is adopted with described
The output end of sample circuit connects.
6. according to the wifi systems described in claim 1-5 any one, which is characterized in that further include a capacitance, the wifi
The power end of chip connects one end of the capacitance, the other end ground connection of the capacitance.
7. according to the wifi systems described in claim 1-5 any one, which is characterized in that the signal transmitting path includes one
Power amplifier, the signal receiving path include a low-noise amplifier；
The input terminal of the power amplifier is connected to the letter as signal input part, the output end of the signal transmitting path
The signal output end of number transmitting path, control terminal are connect with the output end of the sample circuit；
The output end of the low-noise amplifier is connected to described as signal output end, the input terminal of the signal receiving path
The signal input part of signal receiving path, control terminal are connect with the output end of the sample circuit.
8. wifi systems according to claim 7, which is characterized in that the signal transmitting path further includes a high-pass filtering
Device, the output end of the power amplifier connect the input terminal of the high-pass filter, and the output end of the high-pass filter is made
For the signal output end of the signal transmitting path.
9. wifi systems according to claim 7, which is characterized in that the signal receiving path further includes the filter of the second band logical
Wave device, the input terminal of the low-noise amplifier connect the output end of second bandpass filter, second bandpass filtering
Signal input part of the input terminal of device as the signal receiving channel.
10. wifi systems according to claim 1, which is characterized in that the sample circuit, selection circuit, signal transmitting
Delay access and the delay value of signal receiving path and that wifi signals are received and/or are sent less than or equal to wifi agreements
It is required that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721133639.2U CN207691793U (en) | 2017-09-05 | 2017-09-05 | A kind of wifi systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721133639.2U CN207691793U (en) | 2017-09-05 | 2017-09-05 | A kind of wifi systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207691793U true CN207691793U (en) | 2018-08-03 |
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ID=62987297
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| CN201721133639.2U Active CN207691793U (en) | 2017-09-05 | 2017-09-05 | A kind of wifi systems |
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| Country | Link |
|---|---|
| CN (1) | CN207691793U (en) |
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2017
- 2017-09-05 CN CN201721133639.2U patent/CN207691793U/en active Active
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