CN104574528B - A kind of wake-up receiving circuit and board units - Google Patents
A kind of wake-up receiving circuit and board units Download PDFInfo
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- CN104574528B CN104574528B CN201310611559.3A CN201310611559A CN104574528B CN 104574528 B CN104574528 B CN 104574528B CN 201310611559 A CN201310611559 A CN 201310611559A CN 104574528 B CN104574528 B CN 104574528B
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- low noise
- noise amplification
- matching network
- wake
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B15/00—Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points
- G07B15/06—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems
- G07B15/063—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems using wireless information transmission between the vehicle and a fixed station
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
Abstract
The embodiment of the invention discloses a kind of wake up receiving circuit and board units, issue power compatibility issue little with the power that is open to traffic greatly for solving board units, and it is adjustable to realize wake-up receiving sensitivity.Wake up receiving circuit and include radio frequency main control module and antenna, output matching network module, input matching network module, low noise amplification module, supply module；Input matching network module, for carrying out load matched to low noise amplification module and antenna, and selects to the incoming frequency of low noise amplification module；Low noise amplification module, for according to the mode of operation itself configuring and incoming frequency, obtaining corresponding output frequency under mode of operation and output；Supply module, for the mode of operation according to low noise amplification module, carries out direct current biasing to low noise amplification module；Output matching network module, for carrying out load matched to radio frequency main control module and low noise amplification module, and selects to output frequency.
Description
Technical field
The present invention relates to intelligent transportation field technology, especially relate to a kind of wake-up receiving circuit and board units.
Background technology
With the continuous development of intelligent transportation, in order to alleviate increasingly heavy traffic pressure, electronic charging system without parking
（ETC, Electronic Toll Collection）With further extensively and urgent, the ETC skill based on 5.8G band communication
Art tool itself acquires a certain degree of difficulty, and is not only required in the board units of reality（OBU, On Board Unit）With roadside unit（RSU,
Road Side Unit）Between possess excellent communication efficiency, complete electric non-stop toll transaction, and require send out in OBU
Row phase communication smooth, realize Basic Authentication on vehicle for the OBU.Do not require nothing more than the stability that OBU wakes up receptivity, and
And have particular/special requirement to reception etc. compatible can be waken up under unlike signal power grade.OBU, as mobile unit, not only opens from one
The distribution authorization stages beginning, or follow-up on real road with the excellent communication of RSU in, cost and reliability and stable
Property have very strict requirements, and wake up receiving circuit as the key components in OBU design, it wakes up receptivity
Stability, compatibility etc., significant to OBU global design.
Current OBU wakes up receiving portion mostly in the form of common LC receives match circuit, refers to Fig. 1, connects
Receive matching network 102,103 and radio frequency main control chip 101 in same aspect, receive the LC discrete device of matching network 102,103
Topology unit input is directly connected with antenna 104 distributing point, outfan directly and radio frequency main control chip 101 reception pin point
Connect.And this receiving circuit adopts double-layer printing circuit board（PCB, Printed circuit board）Make, in top layer be
Radio signal transmission layer, bottom is metal ground, is dielectric-slab between top layer and bottom；The receiving circuit of this form, knot
Structure is simple, and area occupied is not very big；But its compatible performance one to high power input signal and weak power input signal
As, it is limited to the receiver performance index of radio frequency chip itself, easily by the change impact of surrounding received signal power
Lead to its hydraulic performance decline, such as under different vehicles, possess microwave windshield and the normal signal decay of the highly attenuating degree of signal
Degree windshield, lead to OBU communication capacity to differ greatly, thus affect vehicle be open to traffic distance far and near difference larger, greatly
Have impact on be open to traffic effect and Consumer's Experience.In the distribution authorization stages of OBU, because communication distance during distribution is shorter, signal
Power is larger, and high power signal saturation easily in the reception within radio frequency chip and wake-up circuit, cause to issue unsuccessfully although
Can achieve the signal attenuation of a part by the receiving circuit of LC separative element structure, but the undue decay when signal, easily make
Sensitivity step-down when becoming vehicle and RSU to be normally open to traffic, causes to be open to traffic distance closely, or even the failure that is open to traffic etc..
Content of the invention
Embodiments provide a kind of wake-up receiving circuit and board units, be used for meeting radio frequency main control module to defeated
Enter power bracket to require, it is possible to resolve board units issue power compatibility issue little with the power that is open to traffic greatly, and realize wake-up to connect
Receive sensitivity adjustable.
In view of this, first aspect present invention provides a kind of wake-up receiving circuit, including radio frequency main control module and antenna, its
In, described wake-up receiving circuit can also include：
The output matching network module being connected with described radio frequency main control module, the input matching network being connected with described antenna
Module, the low noise amplification module being arranged between described output matching network module and described input matching network module, set
It is placed in the supply module between described low noise amplification module and described input matching network module；
Described input matching network module, for load matched is carried out to described low noise amplification module and described antenna,
And the incoming frequency of described low noise amplification module is selected；
Described low noise amplification module, for according to the mode of operation itself configuring and described incoming frequency, obtaining institute
State corresponding output frequency under mode of operation and output；
Described supply module, for the mode of operation according to described low noise amplification module, to described low noise amplification mould
Block carries out direct current biasing；
Described output matching network module, for bearing with described low noise amplification module to described radio frequency main control module
Carry coupling, and described output frequency is selected.
Further, described low noise amplification module includes the first low noise amplification chip with bypass functionality；Described
Low noise amplification module, has gain or bypass functionality specifically for configure according to described first low noise amplification chip itself
Mode of operation and described incoming frequency, obtain corresponding output frequency under described mode of operation and output.
Further, described low noise amplification module includes the second low noise amplification chip and is connected across described output matching
Mixed-media network modules mixed-media and the radio-frequency (RF) switch of described input matching network module；
Described low noise amplification module, determines specifically for the working condition opening or closing according to described radio-frequency (RF) switch
The mode of operation of described low noise amplification module；According to described mode of operation and described incoming frequency, determine described mode of operation
Under corresponding output frequency and output.
Preferably, between described antenna and described input matching network module, described input matching network module with described
Between low noise amplification module, all transmitted by micro-strip between described low noise amplification module and described output matching network module
Line is attached.
Preferably, described input matching network module and described output matching network module all include at least one discrete unit
Part includes electric capacity, inductance, resistance with the microstrip transmission line being connected at least one discrete component described, described discrete component.
Preferably, described wake-up receiving circuit is double-layer printing circuit board structure setting, and described wake-up receiving circuit includes
Top layer, bottom and the dielectric-slab being placed between described top layer and described bottom, wherein, described top layer is radio signal transmission layer,
Described bottom is metal ground, described radio frequency main control module, described low noise amplification module, described supply module, described defeated
Enter matching network module and described output matching network module is arranged at described top layer.
Preferably, it is additionally provided with π type resistance attenuation circuit, described output matching network in described input matching network module
It is additionally provided with adjustable resistance in module；
Described low noise amplification module, for being configured to high gain mode, cooperation described radio frequency main control module setting
When highest wakes up receiving sensitivity for -45dBm～-50dBm, add the gain of the 15dB that described low noise amplification module is brought,
Adjustable by described π type resistance attenuation circuit and the two-part resistor power of described adjustable resistance, sensitive to reach wake-up reception
Spend the demand that is open to traffic for -43dBm～-60dBm；It is being configured to bypass mode, it is minimum that the described radio frequency main control module of cooperation is arranged
When waking up receiving sensitivity for -5dBm～-10dBm, add the bypass power suppression of -5dB of described low noise amplification module, lead to
Cross described π type resistance attenuation circuit and the two-part resistor power of described adjustable resistance is adjustable, to reach wake-up receiving sensitivity
Distribution demand for 0dBm～3dBm.
Preferably, described radio frequency main control module adopts Toshiba chip TC32168FTG.
Second aspect present invention provides a kind of board units, and wherein, described board units include waking up receiving circuit, its
In, described wake-up receiving circuit includes：
The output matching network module being connected with described radio frequency main control module, the input matching network being connected with described antenna
Module, the low noise amplification module being arranged between described output matching network module and described input matching network module and
The supply module that described low noise amplification module is connected；
Described input matching network module, for load matched is carried out to described low noise amplification module and described antenna,
And the incoming frequency of described low noise amplification module is selected；
Described low noise amplification module, for according to the mode of operation itself configuring and described incoming frequency, obtaining institute
State corresponding output frequency under mode of operation and output；
Described supply module, for the mode of operation according to described low noise amplification module, to described low noise amplification mould
Block carries out direct current biasing；
Described output matching network module, for bearing with described low noise amplification module to described radio frequency main control module
Carry coupling, and described output frequency is selected.
Further, described low noise amplification module includes the first low noise amplification chip with bypass functionality；Described
Low noise amplification module, has gain or bypass functionality specifically for configure according to described first low noise amplification chip itself
Mode of operation and described incoming frequency, obtain corresponding output frequency under described mode of operation and output.
Further, described low noise amplification module includes the second low noise amplification chip and is connected across described output matching
Mixed-media network modules mixed-media and the radio-frequency (RF) switch of described input matching network module；
Described low noise amplification module, determines specifically for the working condition opening or closing according to described radio-frequency (RF) switch
The mode of operation of described low noise amplification module；According to described mode of operation and described incoming frequency, determine described mode of operation
Under corresponding output frequency and output.
Preferably, between described antenna and described input matching network module, described input matching network module with described
Between low noise amplification module, all transmitted by micro-strip between described low noise amplification module and described output matching network module
Line is attached.
Preferably, described input matching network module and described output matching network module all include at least one discrete unit
Part and the microstrip transmission line being connected at least one discrete component described.
Preferably, described discrete component includes electric capacity, inductance, resistance.
Preferably, described wake-up receiving circuit is double-layer printing circuit board structure setting, and described wake-up receiving circuit includes
Top layer, bottom and the dielectric-slab being placed between described top layer and described bottom, wherein, described top layer is radio signal transmission layer,
Described bottom is metal ground.
Preferably, described radio frequency main control module, described low noise amplification module, described supply module, described input coupling
Mixed-media network modules mixed-media and described output matching network module are arranged at described top layer.
Preferably, described board units are integrated on rearview mirror or instrument board or the steering wheel of automobile.
As can be seen from the above technical solutions, a kind of wake-up receiving circuit provided in an embodiment of the present invention and board units,
There is advantages below：Setting low noise amplification module and power supply between input matching network module and output matching network module
Module, carries out direct current biasing by supply module to low noise amplification module, in conjunction with input matching network module, to low noise amplification
Module provides the biasing of normal work required voltage and incoming frequency to select, and saves circuit space；Further, cooperation output
Distribution network module, if selecting low noise amplification module to be power amplification pattern to input signal, meets to the weak input of amplification
The requirement of signal power strength；If the pattern selecting low noise amplification module to be to input signal bypass, meet to radio frequency master
The strong input power range of control module requires, if described wake-up receiving circuit is used for board units OBU, it is possible to resolve board units are sent out
Row power compatibility issue little with the power that is open to traffic greatly, realizes wake-up receiving sensitivity adjustable.
Brief description
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by use required for embodiment description
Accompanying drawing be briefly described it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, on the premise of not paying creative work, can also be obtained other attached according to these accompanying drawings
Figure.
Fig. 1 is a kind of existing structural representation waking up receiving circuit；
Fig. 2 a is a kind of structural representation waking up receiving circuit provided in an embodiment of the present invention；
Fig. 2 b is a kind of structural representation waking up receiving circuit provided in an embodiment of the present invention；
Fig. 2 c is the board structure of circuit schematic diagram waking up receiving circuit employing provided in an embodiment of the present invention；
Fig. 3 is another structural representation waking up receiving circuit provided in an embodiment of the present invention；
Fig. 4 is another structural representation waking up receiving circuit provided in an embodiment of the present invention.
Specific embodiment
Embodiments provide a kind of wake-up receiving circuit and board units, for meeting the defeated of radio frequency main control module
Enter power bracket to require, it is possible to resolve board units issue power compatibility issue little with the power that is open to traffic greatly, realize wake-up and receive
Sensitivity is adjustable.
For enabling the goal of the invention of the present invention, feature, advantage more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described it is clear that disclosed below to the technical scheme in the embodiment of the present invention
Embodiment be only a part of embodiment of the present invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of not making creative work, broadly falls into present invention protection
Scope.
Term " first " in description and claims of this specification and above-mentioned accompanying drawing, " second ", " the 3rd " "
Four " etc.（If there is）It is for distinguishing similar object, without for describing specific order or precedence.Should manage
The data that solution so uses can be exchanged, in the appropriate case so that embodiments of the invention described herein for example can be to remove
Illustrate here or description those beyond order implement.Additionally, term " comprising " and " having " and theirs is any
Deformation, it is intended that covering non-exclusive comprising, for example, contains the process of series of steps or unit, method, system, product
Product or equipment are not necessarily limited to those steps or the unit clearly listed, but may include clearly not listing or for this
A little processes, method, product or the intrinsic other steps of equipment or unit.
Below by specific embodiment, it is described in detail respectively.
Refer to Fig. 2 a, Fig. 2 a is a kind of structural representation waking up receiving circuit provided in an embodiment of the present invention, wherein,
Described wake-up receiving circuit can be applicable to board units OBU, and described wake-up receiving circuit includes：
Radio frequency main control module 201 and antenna 206, wherein, described wake-up receiving circuit also includes：With described radio frequency master control mould
Output matching network module 202 that block 201 is connected, the input matching network module 205 being connected with described antenna 206, it is arranged at
Low noise amplification module 203 between described output matching network module 202 and described input matching network module 205 and institute
State the supply module 204 that low noise amplification module 203 is connected；
Described input matching network module 205, for carrying out with described antenna 206 to described low noise amplification module 203
Load matched, and the incoming frequency of described low noise amplification module 203 is selected；
Described low noise amplification module 203, for according to the mode of operation itself configuring and described incoming frequency, obtaining
Corresponding output frequency and output under described mode of operation；
Described supply module 204, for the mode of operation according to described low noise amplification module 203, to described low noise
Amplification module 203 carries out direct current biasing；
Described output matching network module 202, for described radio frequency main control module 201 and described low noise amplification module
203 carry out load matched, and described output frequency is selected.
Further, between described antenna 206 and described input matching network module 205, described input matching network mould
Between block 205 and described low noise amplification module 203, described low noise amplification module 203 and described output matching network 202 mould
All it is attached by microstrip transmission line between block.
Further, described input matching network module 205 and described output matching network module 202 are all included at least
One discrete component and the microstrip transmission line being connected at least one discrete component described.Wherein, described discrete component can include
Electric capacity, inductance, resistance, can be LC discrete component topology unit.
From the foregoing, a kind of wake-up receiving circuit provided in an embodiment of the present invention, in input matching network module 205 He
Setting low noise amplification module 203 and supply module 204 between output matching network module 202, because supply module 204 is to low
Noise amplification module 203 carries out direct current biasing, in conjunction with input matching network module 205, low noise amplification module 203 is just provided
Often the biasing of work required voltage and incoming frequency select, and save circuit space；Further, coordinate output matching network module
202, if selecting low noise amplification module to be power amplification pattern to input signal, meet to the weak input signal power of amplification
The requirement of intensity；If the pattern selecting low noise amplification module to be to input signal bypass, meet to radio frequency main control module 201
Strong input power range require, if described wake-up receiving circuit is used for board units, it is possible to resolve board units distribution power is big
The compatibility issue little with the power that is open to traffic, realizes wake-up receiving sensitivity adjustable.
Preferably, refer to Fig. 2 b, Fig. 2 b is another structural representation waking up receiving circuit provided in an embodiment of the present invention
Figure, as a example the reception wake-up circuit shown in by Fig. 2 b, is analyzed to described wake-up receiving circuit provided in an embodiment of the present invention：
Wherein, described wake-up receiving circuit includes：Radio frequency main control module 301 and antenna 309, wherein, described wake-up receives
Circuit also includes：The output matching network module 303 that is connected with described radio frequency main control module 301, it is connected with described antenna 309
Input matching network module 307, be arranged at described output matching network module 303 and described input matching network module 307 it
Between low noise amplification module 306, the supply module 304 being connected with described low noise amplification module 306；
It is understood that described radio frequency main control module 301, output matching network module 303, input matching network module
307th, the 26S Proteasome Structure and Function of supply module 304 and antenna 309 is realized referring to the wake-up receiving circuit described in above-described embodiment, this
Place is no longer specifically described.
Described input matching network module 307 and described output matching network module 303 all include at least one discrete unit
Part and the microstrip transmission line being connected at least one discrete component described.Specifically, described input matching network module 307 includes unit
Device C306, C305 and L303 and microstrip transmission line 308；Described supply module 304 includes C304, L304, R301 and R302；
Described output matching network module 303 includes C303, L302, C302, L301 and C301 and microstrip transmission line 302；
Described low noise amplification module 306 includes the first low noise amplification chip with bypass functionality（LNA, Low
Noise Amplifier）U302；Described low noise amplification module 306, specifically for according to described first low noise amplification chip
U302 configuration itself have the mode of operation of gain or bypass functionality and described incoming frequency, obtain under described mode of operation relatively
The output frequency answered and output.
It is understood that described first low noise amplification chip U302 includes but is not limited to HMC604LP3, wherein first
Low noise amplification chip U302（HMC604LP3）Possesses bypass functionality, its pin15 is Bypass functional pin；Separately it is readily apparent that
, each components and parts only explanation for example in above-mentioned each module, it can carry out concrete value according to actual application environment, this
Place is not especially limited.
It should be noted that in the embodiment of the present invention, with the low noise amplification module 306 of bypass functionality, its input and output
End（Input is pin3, and outfan is pin10）It is 50 ohm of ports of standard, supply module 304（I.e. direct current biasing net
Network）With input matching network module 307（Comprise the microstrip transmission line 308 of setting in module）, coordinate the coplanar of circuit board top layer
The use of the central microwave transmission line of waveguide, has set up the low insertion loss amplifier input of low noise amplification module 306 together
Circuit, serves filtering coupling and the effect providing direct current biasing；High frequency bypass filter capacitor is loaded on supply module 304
The mode of C304, can efficiently accomplish the bypass filter action to high-frequency microwave signal, reduce the impact to supply module 204；
Output matching network module 303（Comprise the microstrip transmission line 302 of setting in module）Provide radio frequency main control module 301 wake-up to connect
Spasm foot and the effect of the first low noise amplification chip U302 output pin end load matched, and to the first low noise amplification core
The incoming frequency of piece U302 is selected.
For convenience of understanding, the wake-up receiving circuit in the embodiment of the present invention is applied to the less OBU in inner space
In equipment, and together with components and parts such as OBU antenna, battery, breaking-proof switch, buzzer and sockets, test circuit in microwave dark room
Wake-up receptivity：
First, it is assumed that in low noise amplification module 306（Assume that the first low noise amplification chip U302 is HMC604LP3）Just
In the case of often working, when low noise amplification module 306 is configured to high gain mode（Can be carried out soft by controlling switch 305
Part configures）When, wake up reception gain and reach 16dB, deduct input matching network module and output matching network module is brought into
2dB insertion loss, wakes up receiving sensitivity and improves 14dB, radio frequency main control module（I.e. radio frequency main control chip）Itself possess-
The wake-up receiving sensitivity lower limit of 45dB, therefore due to adding the gain of low noise amplification module 306, wake up receiving sensitivity and reach
Arrive -59dB, fully meet the high-end vehicle under the microwave windshield possessing the highly attenuating degree of signal and be open to traffic demand；
When low noise amplification module 306 is configured to low gain mode, wakes up reception gain and reach 5dB, deduct input
The 2dB insertion loss that distribution network module and output matching network module are brought into, wakes up receiving sensitivity and improves 3B, radio frequency master control
Module possesses the wake-up receiving sensitivity lower limit of -45dB in itself, therefore due to adding the gain of low noise amplification module, wake-up connects
Receive sensitivity and reach -48dB, fully meet the common vehicle under the microwave windshield possessing the low dough softening of signal and be open to traffic demand；
When enabling the bypass functionality of low noise amplification module, the gain of low noise amplification module is -10dB, for distribution
When, input signal power is the situation of -10dBm, deducts the 2dB that input matching network module and output matching network module are brought into
Insertion loss, wakes up receiving sensitivity and reduces -12dB, and the wake-up reception that radio frequency main control module possesses -20dB in itself is sensitive
The degree upper limit, therefore due to adding the gain of low noise amplification module 306, wake up receiving sensitivity and reach -22dB, fully meet OBU
The communicating requirement of distribution authorization stages.
Compared in the case of using common LC coupling receiving circuit, existing common wake-up as shown in Figure 1 connects
Receive circuit, under the influence of the additional gain not having low noise amplification module etc., if desired deduct input matching network module and
The 3dB insertion loss that output matching network module is brought into, it wakes up receiving sensitivity is -42dB, is only just met for possessing signal
Common vehicle under the microwave windshield of the low dough softening is open to traffic demand；And because it does not possess under bypass mode, input to strong
The damping capacity of signal, for during distribution, input signal power is the situation of -10dBm, deducts input and output matching network and brings into
3dB insertion loss, wake up receiving sensitivity and reduce -13dB, therefore its distribution signal power receiving is more than radio frequency master control
Chip possesses the wake-up receiving sensitivity upper limit of -20dB in itself, therefore can not meet the communicating requirement that OBU issues authorization stages.
Test result shows, the wake-up receiving circuit in the embodiment of the present invention is applied larger more complicated in surrounding enviroment changed power
In OBU equipment, performance, compatibility distribution simultaneously and be open to traffic demand and the adjustable index request of sensitivity that equally can keep.
It is contemplated that the data in above example is produced just for this test environment is lower, according to actual environment
There may be fluctuation, do not constitute the restriction of the embodiment of the present invention.
Refer to Fig. 2 c, Fig. 2 c is that the board structure of circuit waking up receiving circuit employing provided in an embodiment of the present invention is illustrated
Figure, such as schemes this wake-up receiving circuit and adopts double-layer PCB board to make, top layer 501 is radio signal transmission layer, bottom 502 is coplanar
Waveguide line structure, is dielectric-slab 503 between top layer and bottom；Wherein, coplanar waveguide transmission line structure includes pcb board lower floor
Ground level, the ground level on pcb board upper strata（Two regions on top layer 501 microstrip transmission line side）, pcb board upper strata micro-strip transmission
Line.
Preferably, the Rogers4003 sheet material that have chosen firing frequency performance in the embodiment of the present invention receives electricity to make to wake up
Road, that is, adopt pcb board Rogers4003 to accept sheet material as radio signal transmission base, pcb board material top layer 501 is radiofrequency signal
Cabling, including low noise amplification module 306 and radio frequency main control module 301, input matching network module 307 and described output matching
Mixed-media network modules mixed-media 303, and it is also provided with the biasing circuit of low noise amplification module 306（I.e. supply module 304）, play miniaturization
With the effect of Performance optimization so as to stable performance and the little demand that takes up room can be met.
It is further preferred that this pcb board adopts the Rogers sheet material of 0.5mm thickness, pcb board top layer 501 co-planar waveguide
Central microwave transmission line adopts the width of 0.8mm, and central microwave transmission line is the width of 0.2mm apart from whole machine ground level, makes sky
Line can in 5.75GHz～5.85GHz frequency range steady operation.
Taking circuit board as illustrated in fig. 2 c as a example, the central microwave transmission line of described circuit board top layer 501 co-planar waveguide,
The width of microstrip transmission line is 0.016 λ0To 0.02 λ0（Wherein λ0It is operating frequency corresponding air wavelength, such as 5.8GHz corresponds to
λ0It is about 51.7mm）.In coplanar waveguide transmission line structure 502, the microstrip transmission line on pcb board upper strata is apart from whole machine ground level
Width is 0.003 λ0To 0.004 λ0.The radio-frequency transmission line form of this co-planar waveguide, not only easily manufactured, superior performance, and hold
Easily improve current densities, realize OBU Miniaturization Design, because the motility of its ground connection aspect is high, its capacity of resisting disturbance is also better than
The signal transmssion line of conventional microstrip line form, transmission performance meets the 5.8GHz frequency range of ETC.Load the transmission line of this co-planar waveguide
After pattern, within input matching network module 307 and output matching network module 303 insertion loss can be controlled in 2dB, thus
The spirit of more large gain, when low noise amplification module 306 uses normal gain pattern, can be provided for waking up receiving circuit
Sensitivity, realizes highly sensitive wake-up reception demand, meets the need that are open to traffic under the microwave windshield possessing the highly attenuating degree of signal
Ask；When low noise amplification module 306 uses ByPass bypass mode, because its ByPass bypass mode is provided that 10dB
Circuit decay, for superpower signal input, effectively can reach the power at radio frequency main control chip end by relatively low its, thus
Realize superpower signal input, meet communicating requirement during OBU distribution；Again because the gain of low noise amplification module 306 can
Adjust, when its gain is set to less gain, wakes up receiving sensitivity intensity typically, meet and possess the low dough softening of signal, that is, general
The demand that is open to traffic being open to traffic under a microwave windshield.
Can be referring to Fig. 3, Fig. 3 is another structural representation waking up receiving circuit provided in an embodiment of the present invention, wherein, institute
State wake-up receiving circuit and include radio frequency main control module 401 and antenna 409, the output being connected with described radio frequency main control module 401
Distribution network module 403, the input matching network module 407 being connected with described antenna 409, it is arranged at described output matching network mould
Low noise amplification module 406 between block 403 and described input matching network module 407 and described low noise amplification module 406
Connected supply module 404；
It is understood that described radio frequency main control module 401, output matching network module 403, input matching network module
407th, the 26S Proteasome Structure and Function of supply module 404 and antenna 409 is realized referring to the wake-up receiving circuit described in above-described embodiment, this
Place is no longer specifically described.
It is different from the reception wake-up circuit shown in Fig. 2 b, in the embodiment of the present invention, described low noise amplification module 406 includes
Second low noise amplification chip U402 and be connected across described output matching network module 403 and described input matching network module
407 radio-frequency (RF) switch 405；
Described low noise amplification module 406, specifically for the work shape opening or closing according to described radio-frequency (RF) switch 405
State determines the mode of operation of described low noise amplification module 406；According to described mode of operation and described incoming frequency, determine described
Corresponding output frequency and output under mode of operation.
It is understood that those skilled in the art can be understood that, for convenience and simplicity of description, should
The concrete operating principle of wake-up receiving circuit providing in embodiment or work process, may be referred to aforementioned as shown in Figure 2 b
Wake up the corresponding process in receiving circuit embodiment, will not be described here.
From the foregoing, a kind of wake-up receiving circuit provided in an embodiment of the present invention, in input matching network module 407 He
Setting low noise amplification module 406 and supply module 404 between output matching network module 403, because supply module 404 is to low
Noise amplification module 406 carries out direct current biasing, in conjunction with input matching network module 407, low noise amplification module 406 is just provided
Often the biasing of work required voltage and incoming frequency select, and save circuit space；Further, coordinate output matching network module
403, if selecting low noise amplification module to be power amplification pattern to input signal, meet to the weak input signal power of amplification
The requirement of intensity；If the pattern selecting low noise amplification module to be to input signal bypass, meet to radio frequency main control module 401
Strong input power range require, if described wake-up receiving circuit is used for board units OBU, it is possible to resolve board units issue power
The big compatibility issue little with the power that is open to traffic, realizes wake-up receiving sensitivity adjustable.
In conjunction with the introduction to described wake-up receiving circuit shown in Fig. 2 b and Fig. 3, below with the tool in a practical application
Body embodiment is further analyzed：
Reception wake-up circuit as shown in Figure 4, wherein, described wake-up receiving circuit includes：Radio frequency main control module 601 and sky
Line 609, wherein, described wake-up receiving circuit also includes：The output matching network module being connected with described radio frequency main control module 601
603rd, the input matching network module 607 that is connected with described antenna 609, it is arranged at described output matching network module 603 and institute
State the low noise amplification module 606 between input matching network module 607, the confession being connected with described low noise amplification module 606
Electric module 604；
It is understood that described radio frequency main control module 601, output matching network module 603, input matching network module
607th, the 26S Proteasome Structure and Function of supply module 604 and antenna 609 is realized referring to the wake-up receiving circuit described in above-described embodiment, this
Place is no longer specifically described.
As Fig. 4, it is different from shown in Fig. 2 b and Fig. 3 and wakes up receiving circuit, in low noise amplification module 606 and antenna 609
（Radio frequency microstrip antenna can be claimed）Between input matching network module 607 introduce " π " type resistance attenuation circuit；Put in low noise
Big output matching network module 603 between module 606 and radio frequency main control module 601 introduces adjustable resistance R603.
Wherein, described low noise amplification module 606 includes the low noise amplification chip U602 with bypass functionality, this enforcement
In example, the first low noise amplification chip U602 can adopt chip HMC604LP3, and described radio frequency main control module 601 can adopt Toshiba
Chip TC32168FTG；Wake up receiving circuit as shown in Figure 4, in actual applications, when low noise amplification module 606 is configured to height
Gain mode, coordinate be set to inside its radio frequency main control module 601 highest wake up receiving sensitivity -45dBm～-50dBm when, plus
The gain of the 15dB that upper low noise amplification module 606 is brought, by " π " type resistance attenuation circuit and adjustable resistance R603 this two
The resistor power dividing is adjustable, can achieve the demand that is normally open to traffic that final wake-up receiving sensitivity is -43dBm～-60dBm；When
Low noise amplification module 606 is configured to bypass mode, coordinates and is set to minimum wake-up reception spirit inside its radio frequency main control module 601
During sensitivity -5dBm～-10dBm, add the bypass power suppression of -5dB of low noise amplification module 606, declined by " π " type resistance
Powered down road and this two-part resistor power of adjustable resistance R603 are adjustable, can achieve that final wake-up receiving sensitivity can be 0dBm
The normal distribution demand of～3dBm.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and does not have the portion described in detail in certain embodiment
Point, may refer to the associated description of other embodiment.
To sum up to the analysis waking up receiving circuit as shown in Figure 4, wake-up receiving circuit provided in an embodiment of the present invention is in reality
In the application of border, can be adjustable by " π " type resistance attenuation circuit and this two-part resistor power of adjustable resistance R603, if selecting
Low noise amplification module 606 is power amplification pattern to input signal, then meet to the weak input signal power intensity of amplification
Require；If the pattern selecting low noise amplification module 606 to be to input signal bypass, meet to radio frequency main control module 601
Strong input power range requires, and can achieve that wake-up receiving sensitivity is adjustable, and satisfaction is normal to issue demand.
Implement wake-up receiving circuit provided in an embodiment of the present invention for ease of more preferable, the embodiment of the present invention also provides one kind
Board units OBU including above-mentioned wake-up receiving circuit.Wherein the implication of noun is identical with above-mentioned wake-up receiving circuit, specifically
Realize details to may be referred to wake up the explanation in receiving circuit embodiment.
The embodiment of the present invention also provides a kind of board units, and described board units include waking up receiving circuit, wherein, described
Wake up receiving circuit to include：
The output matching network module being connected with described radio frequency main control module, the input matching network being connected with described antenna
Module, the low noise amplification module being arranged between described output matching network module and described input matching network module and
The supply module that described low noise amplification module is connected；
Described input matching network module, for load matched is carried out to described low noise amplification module and described antenna,
And the incoming frequency of described low noise amplification module is selected；
Described low noise amplification module, for according to the mode of operation itself configuring and described incoming frequency, obtaining institute
State corresponding output frequency under mode of operation and output；
Described supply module, for the mode of operation according to described low noise amplification module, to described low noise amplification mould
Block carries out direct current biasing；
Described output matching network module, for bearing with described low noise amplification module to described radio frequency main control module
Carry coupling, and described output frequency is selected.
Preferably, described board units can be integrated on automobile, for example：Described board units can be integrated in automobile
In the other positions such as rearview mirror or instrument board or steering wheel, it is not especially limited herein.
It is understood that those skilled in the art can be understood that, for convenience and simplicity of description, should
The concrete operating principle of wake-up receiving circuit providing in embodiment or work process, may be referred to aforementioned wake-up receiving circuit
Corresponding process in embodiment, will not be described here.
From the foregoing, a kind of board units provided in an embodiment of the present invention, it is electric that described board units include wake-up reception
Road, this wake-up receiving circuit arrange between input matching network module and output matching network module low noise amplification module and
Supply module, because supply module carries out direct current biasing to low noise amplification module, in conjunction with input matching network module, to low noise
Sound amplification module provides the biasing of normal work required voltage and incoming frequency to select, and saves circuit space；Further, coordinate
Output matching network module, if selecting low noise amplification module to be power amplification pattern to input signal, meets to amplification
The requirement of weak input signal power intensity；If selecting the pattern that low noise amplification module is to input signal bypass, it is right to meet
The strong input power range of radio frequency main control module requires, it is possible to resolve board units issue power compatibility little with the power that is open to traffic greatly
Problem, realizes wake-up receiving sensitivity adjustable.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and does not have the portion described in detail in certain embodiment
Point, may refer to the associated description of other embodiment.
The wake-up the receiving circuit above embodiment of the present invention being provided and board units are described in detail, herein
Apply specific case the principle of the present invention and embodiment are set forth, the explanation of above example is only intended to help
Understand the method for the present invention and its core concept；Simultaneously for one of ordinary skill in the art, according to the thought of the present invention,
All will change in specific embodiments and applications, to sum up, this specification content should not be construed as to the present invention
Restriction.
Claims (10)
1. a kind of wake-up receiving circuit, including radio frequency main control module and antenna it is characterised in that described wake-up receiving circuit is also wrapped
Include：The output matching network module being connected with described radio frequency main control module, the input matching network module being connected with described antenna,
It is arranged at the low noise amplification module between described output matching network module and described input matching network module, be arranged at institute
State the supply module between low noise amplification module and described input matching network module；
Described input matching network module is for carrying out load matched to described low noise amplification module and described antenna and right
The incoming frequency of described low noise amplification module is selected；
Described low noise amplification module, for according to the mode of operation itself configuring and described incoming frequency, obtaining described work
Corresponding output frequency and output under operation mode；
Described supply module, for the mode of operation according to described low noise amplification module, enters to described low noise amplification module
Row direct current biasing；
Described output matching network module, for carrying out load to described radio frequency main control module and described low noise amplification module
Join, and described output frequency is selected.
2. circuit according to claim 1 it is characterised in that：
Described low noise amplification module includes the first low noise amplification chip with bypass functionality；
Described low noise amplification module, has gain or side specifically for configure according to described first low noise amplification chip itself
The mode of operation of road function and described incoming frequency, obtain corresponding output frequency under described mode of operation and output.
3. circuit according to claim 1 it is characterised in that：
Described low noise amplification module includes the second low noise amplification chip and is connected across described output matching network module and institute
State the radio-frequency (RF) switch of input matching network module；
Described low noise amplification module, described in determining according to the working condition opening or closing of described radio-frequency (RF) switch
The mode of operation of low noise amplification module；According to described mode of operation and described incoming frequency, determine phase under described mode of operation
Corresponding output frequency and output.
4. the circuit according to any one of claims 1 to 3 it is characterised in that：
Between described antenna and described input matching network module, described input matching network module and described low noise amplification mould
Between block, all it is attached by microstrip transmission line between described low noise amplification module and described output matching network module.
5. the circuit according to any one of claims 1 to 3 it is characterised in that
Described input matching network module and described output matching network module all include at least one discrete component and are connected institute
State the microstrip transmission line of at least one discrete component, described discrete component includes electric capacity, inductance, resistance.
6. the circuit according to any one of claims 1 to 3 is it is characterised in that described wake-up receiving circuit is Double-layered printing
Board structure of circuit is arranged, and described wake-up receiving circuit includes top layer, bottom and Jie being placed between described top layer and described bottom
Scutum, wherein, described top layer is radio signal transmission layer, and described bottom is metal ground, described radio frequency main control module, described
Low noise amplification module, described supply module, described input matching network module and described output matching network module are arranged at
Described top layer.
7. circuit according to claim 1 and 2 it is characterised in that：
It is additionally provided with π type resistance attenuation circuit in described input matching network module, also set in described output matching network module
It is equipped with adjustable resistance；
Described low noise amplification module, for being configured to high gain mode, the highest of cooperation described radio frequency main control module setting
When waking up receiving sensitivity for -45dBm～-50dBm, add the gain of the 15dB that described low noise amplification module is brought, pass through
Described π type resistance attenuation circuit and the two-part resistor power of described adjustable resistance are adjustable, with reach wake up receiving sensitivity for-
The demand that is open to traffic of 43dBm～-60dBm；It is being configured to bypass mode, the minimum wake-up of cooperation described radio frequency main control module setting connects
When receiving sensitivity for -5dBm～-10dBm, add the bypass power suppression of -5dB of described low noise amplification module, by described
π type resistance attenuation circuit and the two-part resistor power of described adjustable resistance are adjustable, to reach wake-up receiving sensitivity as 0dBm
The distribution demand of～3dBm.
8. circuit according to claim 1 it is characterised in that：
Described radio frequency main control module adopts Toshiba chip TC32168FTG.
9. it is characterised in that described board units include waking up receiving circuit, wherein, described wake-up receives a kind of board units
Circuit is the wake-up receiving circuit as described in any one of claim 1 to 8.
10. board units according to claim 9 are it is characterised in that described board units are integrated in the rearview mirror of automobile
Or on instrument board or steering wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310611559.3A CN104574528B (en) | 2013-11-26 | 2013-11-26 | A kind of wake-up receiving circuit and board units |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310611559.3A CN104574528B (en) | 2013-11-26 | 2013-11-26 | A kind of wake-up receiving circuit and board units |
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| CN104574528B true CN104574528B (en) | 2017-03-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3384127B2 (en) * | 1994-07-20 | 2003-03-10 | 株式会社デンソー | Interrogator system for mobile responder |
| CN102082587B (en) * | 2009-12-01 | 2015-05-20 | 中兴通讯股份有限公司 | Data communication method and system of vehicle-mounted unit |
| CN101795463B (en) * | 2010-02-09 | 2012-10-31 | 工业和信息化部电信传输研究所 | Method and system for analyzing WLAN authentication and privacy infrastructure protocol |
| CN102055491B (en) * | 2010-04-14 | 2015-11-25 | 锐迪科创微电子（北京）有限公司 | RF front-end module and there is the mobile communications device of this module |
| CN102693585B (en) * | 2011-03-25 | 2016-04-13 | 深圳市金溢科技股份有限公司 | Board units |
| CN102404022A (en) * | 2011-11-04 | 2012-04-04 | 中兴通讯股份有限公司 | Power amplifying module, radio frequency front end module and multi-mode terminal |
| CN203204680U (en) * | 2013-04-23 | 2013-09-18 | 深圳市金溢科技有限公司 | Electronic communication apparatus, electronic label and electronic non-stop charging system |
| CN103220012A (en) * | 2013-05-08 | 2013-07-24 | 四川省艾普网络股份有限公司 | WIFI (Wireless Fidelity) module |
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