CN208424353U - A kind of NB-IoT RF front-end circuit applied to digital light distribution - Google Patents
A kind of NB-IoT RF front-end circuit applied to digital light distribution Download PDFInfo
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- CN208424353U CN208424353U CN201820963191.5U CN201820963191U CN208424353U CN 208424353 U CN208424353 U CN 208424353U CN 201820963191 U CN201820963191 U CN 201820963191U CN 208424353 U CN208424353 U CN 208424353U
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Abstract
The utility model discloses a kind of NB-IoT RF front-end circuits applied to digital light distribution, including Peripheral Interface, microcontroller, clock phase-locked loop and sequentially connected Dual channel transmission circuit unit, base band and Dual channel reception circuit unit；The microcontroller is connect with Dual channel transmission circuit unit and Dual channel reception circuit unit respectively, and the clock phase-locked loop is connect with Dual channel transmission circuit unit and Dual channel reception circuit unit respectively；The Peripheral Interface is connect with Dual channel transmission circuit unit and Dual channel reception circuit unit respectively；The base band is provided with digital interface.The utility model solves the problems, such as that cost of the existing technology is big, power consumption is high, practicability is low and design is single.
Description
Technical field
The utility model belongs to wireless communication technology field, and in particular to a kind of NB-IoT applied to digital light distribution is penetrated
Frequency front-end circuit.
Background technique
In information age today, people are by the transmitting of information and the interactive necessary component as social life.Its
In, wireless communication is a part the most active in the communications field, is all widely used in all fields.In order to meet
The different demands of consumer, international telecommunication unit have launched different communication standards.In face of miscellaneous standard, consumption
Person prefers to only to support different communication services by an electronic equipment.
" digital light compartment system " is a kind of multi-service compartment system, can support more operators, multi-standard, multicarrier,
And integrated wlan system, a step solves voice and data traffic requirement is provided simultaneously with mixing compared with traditional analog compartment system
Networking, delay compensation, automatic carrier track, uplink bottom are made an uproar the features such as low.
Narrowband Internet of Things NB-IoT is the emerging technology in one, the field IoT, supports low power consuming devices in the honeycomb of wide area network
Data connection, also referred to as low-power consumption wide area network (LPWAN).NB-IoT supports that stand-by time is long, higher to network connectivity requirements
The efficient connection of equipment, while very comprehensive indoor cellular data connection covering can also be provided.
The prior art has the following problems:
(1) existing RF front-end circuit, cost is big, and power consumption is high, is unable to satisfy the design requirement of NB-IoT；
(2) practicability of existing RF front-end circuit is low, can not adapt to multi-frequency condition；
(3) existing RF front-end circuit design is single, and mostly single channel designs.
Utility model content
For above-mentioned deficiency in the prior art, a kind of cost provided by the utility model is small, low in energy consumption, practicability it is high with
And the NB-IoT RF front-end circuit for being applied to digital light distribution of flexible design, meet the design requirement of NB-IoT, transports extensively
For solving in digital light distribution technique field, cost of the existing technology is big, power consumption is high, practicability is low and design is single
One the problem of.
In order to reach above-mentioned purpose of utility model, the technical solution adopted in the utility model are as follows:
A kind of NB-IoT RF front-end circuit applied to digital light distribution, including Peripheral Interface, microcontroller, clock lock
Phase ring and sequentially connected Dual channel transmission circuit unit, base band and Dual channel reception circuit unit；Microcontroller respectively with
Dual channel transmission circuit unit is connected with Dual channel reception circuit unit, clock phase-locked loop respectively with Dual channel transmission circuit unit
It is connected with Dual channel reception circuit unit；Peripheral Interface respectively with Dual channel transmission circuit unit and Dual channel reception circuit unit
Connection；Base band is provided with digital interface.
Further, Dual channel transmission circuit unit includes the first transmission low-pass filter and is connected in parallel and structure phase
With the first transmission circuit and the second transmission circuit, the both ends of the first transmission low-pass filter respectively with the first transmission circuit and the
The connection of two transmission circuits.
Further, the first transmission circuit and the second transmission circuit respectively include sequentially connected received signal strength indicator
Device, input circuit and transmission channel circuit, input circuit include three input ports, each input port respectively with corresponding function
Rate amplifier is connected in series, and the input terminal of the last one power amplifier is connect with received signal strength indicator device, three function
The output end of rate amplifier is connect with the input terminal of transmission channel circuit；
Transmission channel circuit is connected in parallel including two and the identical transmission channel of structure, each transmission channel respectively include
Low-converter, trans-impedance amplifier, the first low pass channel selection filter, self-induction gain controller and the mould being sequentially connected in series
Number converter, the input terminal of low-converter are connect with the output end of three power amplifiers, and analog-digital converter passes through the first number
Interface is connect with base band；It is transmitted respectively with the low-converter of the first transmission circuit and second at the both ends of first transmission low-pass filter
The low-converter of circuit connects.
Further, Dual channel reception circuit unit includes the second transmission low-pass filter and is connected in parallel and structure phase
With first receive circuit and second and receive circuit, the both ends of the second transmission low-pass filter receive circuit and the with first respectively
Two receive circuit connection.
Further, the first reception circuit and the second reception circuit respectively include sequentially connected reception channel circuit and defeated
Circuit out, receiving channel circuit includes being connected in parallel and identical two reception channel of structure, and each reception channel is including successively
The digital analog converter of series connection, the second low pass channel selection filter and upconverter, the output end of upconverter with it is defeated
Circuit connection out, digital analog converter are connect by the second digital interface with base band；
Two output ports of output circuit, the input terminal of each output port and the output end of low noise amplifier connect,
The input terminal of each low noise amplifier is connect with the output end of two upconverter, and the output end of each low noise amplifier
It is connect respectively with reception power amplifier driver and power supply；
The upconverter and second that the both ends of second transmission low-pass filter receive circuit with first respectively receives circuit
Upconverter connection.
Further, the both ends of microcontroller select filter and the with the first low pass channel of the second transmission circuit respectively
One receives the second low pass channel selection filter connection of circuit, the both ends of the clock phase-locked loop mould with the second transmission circuit respectively
Number converter and first receive circuit digital analog converter connection, Peripheral Interface respectively with the low-converter of the second transmission circuit and
First receives the upconverter connection of circuit.
Further, NB-IoT RF front-end circuit further includes digital winding, field programmable gate array and digital transmitting and receiving
Signal processor, digital winding state number between Dual channel transmission circuit unit and Dual channel reception circuit unit and base band
Word winding is connect with field programmable gate array and digital receiving and transmitting signal processor respectively.
Further, input port and output port are all serial port, and the first digital interface and the second digital interface are all
For serial line interface.
This programme has the beneficial effect that
This programme uses the advanced transceiver design based on CMOS technology, can be substantially reduced cost and power consumption.This programme
It is integrated with the double transceiver framework and important on piece digital function to support Multiple Input Multiple Output；It can be in any movement
It is run under communication standard and common mobile communication frequency, improves practicability；Make compared to Transmit Receive Unit before in the market
Very big improvement, realizes and reaches lowest power consumption in similar-type products, extended frequency range, highest level it is integrated, more greatly
Design flexibility, meet the design requirement of NB-IoT, can be widely used in digital light distribution technique field.
Detailed description of the invention
Fig. 1 is the NB-IoT RF front-end circuit figure applied to digital light distribution；
Fig. 2 is the first transmission circuit figure；
Fig. 3 is the first reception circuit diagram；
Fig. 4 is that low pass channel selects filter circuit figure；
Fig. 5 is received signal strength indicator device circuit diagram.
Wherein, 1, Dual channel transmission circuit unit；11, the first transmission circuit；111, input port；112, power amplification
Device；113, low-converter；114, trans-impedance amplifier；115, the first low pass channel selects filter；116, self-induction gain controls
Device；117, analog-digital converter；12, the second transmission circuit；13, the first transmission low-pass filter；14, received signal strength indicator
Device；2, Dual channel reception circuit unit；21, first circuit is received；211, digital analog converter；212, the second low pass channel selection filter
Wave device；213, upconverter；214, low noise amplifier；215, output port；22, second circuit is received；23, the second transmission is low
Bandpass filter；24, power amplifier driver is received；25, power supply；3, base band；41, Peripheral Interface；42, microcontroller；43, when
Clock phaselocked loop；5, digital winding；6, field programmable gate array；7, digital transmitting and receiving signal processor.
Specific embodiment
The utility model is further described With reference to embodiment.Wherein, being given for example only property of attached drawing
Illustrate, expression is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；In order to which this reality is better described
With novel embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To ability
For field technique personnel, the omitting of some known structures and their instructions in the attached drawings are understandable.
In the utility model embodiment, as shown in Figure 1, a kind of NB-IoT radio-frequency front-end electricity applied to digital light distribution
Road, as shown in Figure 1, include Peripheral Interface 41, concrete model be L6219DS013TR microcontroller 42, concrete model be
The clock phase-locked loop 43 of TM4101 and sequentially connected Dual channel transmission circuit unit 1, base band 3 and Dual channel reception circuit list
Member 2；Microcontroller 42 is connect with Dual channel transmission circuit unit 1 and Dual channel reception circuit unit 2 respectively, clock phase-locked loop 43
It is connect respectively with Dual channel transmission circuit unit 1 and Dual channel reception circuit unit 2；Peripheral Interface 41 respectively with Dual channel transmission
Circuit unit 1 and Dual channel reception circuit unit 2 connect；Base band 3 is provided with digital interface；On piece integrates microcontroller 42 and is used for
Simplify calibration, tuning and control；Integrated clock phaselocked loop 43 is for being flexibly generated and distributing clock.
In the present embodiment, Dual channel transmission circuit unit 1 includes the first transmission low pass filtered that concrete model is MAX280CPA
It wave device 13 and is connected in parallel and identical first transmission circuit 11 of structure and the second transmission circuit 12, the first transmission circuit 11 is such as
Shown in Fig. 2, the both ends of the first transmission low-pass filter 13 are connect with the first transmission circuit 11 and the second transmission circuit 12 respectively.
In the present embodiment, it is strong that the first transmission circuit 11 and the second transmission circuit 12 respectively include sequentially connected reception signal
Indicator 14, input circuit and transmission channel circuit are spent, input circuit includes three input ports 111, each input port 111
It is connected in series respectively with corresponding power amplifier 112, and the input terminal of the last one power amplifier 112 and reception signal are strong
It spends indicator 14 to connect, the output end of three power amplifiers 112 is connect with the input terminal of transmission channel circuit, power amplification
The concrete model of device is MS2000, and the circuit of received signal strength indicator device is as shown in Figure 5；
Transmission channel circuit is connected in parallel including two and the identical transmission channel of structure, each transmission channel respectively include
It is the low-converter 113 that is sequentially connected in series, the trans-impedance amplifier 114 that concrete model is TLC2201, as shown in Figure 4 first low
Communication channel selects filter 115, the concrete model to be for the self-induction gain controller 116 and concrete model of SLAGC1200D
The analog-digital converter 117 of ADS1286UL, the input terminal of low-converter 113 are connect with the output end of three power amplifiers 112,
Analog-digital converter 117 is connect by the first digital interface with base band 3；The both ends of first transmission low-pass filter 13 are respectively with first
The connection of the low-converter 113 of the low-converter 113 of transmission circuit 11 and the second transmission circuit 12.
In the present embodiment, Dual channel reception circuit unit 2 includes the second transmission low pass filtered that concrete model is MAX280CPA
Wave device 23 and be connected in parallel and structure it is identical first receive circuit 21 and second receive circuit 22, first receive circuit 21 such as
Shown in Fig. 3, the both ends of the second transmission low-pass filter 23 are connect with the first reception circuit 21 and the second reception circuit 22 respectively.
In the present embodiment, the first reception circuit 21 and the second reception circuit 22 respectively include sequentially connected reception channel electricity
Road and output circuit, receiving channel circuit includes being connected in parallel and the identical two receptions channel of structure, each reception channel packet
Include the digital analog converter 211, the second low pass channel choosing as shown in Figure 4 that the concrete model being sequentially connected in series is AD9779BSVZ
Filter 212 and upconverter 213 are selected, the output end of upconverter 213 is connect with output circuit, and digital analog converter 211 is logical
The second digital interface is crossed to connect with base band 3；
Two output ports 215 of output circuit, the input terminal and concrete model of each output port 215 are CHA3656-
The output end of the low noise amplifier 214 of QAG connects, the input terminal of each low noise amplifier 214 and two upconverter 213
Output end connection, and the output end of each low noise amplifier 214 respectively with concrete model be UPC1298V reception power
Amplifier-driver 24 and power supply 25 connect；
The upconverter 213 and second that the both ends of second transmission low-pass filter 23 receive circuit 21 with first respectively receives
The upconverter 213 of circuit 22 connects.
In the present embodiment, the both ends of microcontroller 42 select to filter with the first low pass channel of the second transmission circuit 12 respectively
Device 115 and first receive circuit 21 the second low pass channel selection filter 212 connect, the both ends of clock phase-locked loop 43 respectively with
The digital analog converter 211 of the analog-digital converter 117 of second transmission circuit 12 and the first reception circuit 21 connects, and Peripheral Interface 41 divides
It is not connect with the upconverter 213 of the low-converter 113 of the second transmission circuit 12 and the first reception circuit 21.
In the present embodiment, NB-IoT RF front-end circuit further include digital winding 5, concrete model be EP1C3T100C8N
The digital transmitting and receiving signal processor 7 that field programmable gate array 6 and concrete model are TMS320C6211BZFN150, digital winding
5 are located at transmission circuit circuit and receive between circuit circuit and base band 3, state digital winding 5 respectively with field programmable gate array 6
It is connected with digital receiving and transmitting signal processor 7.
In the present embodiment, input port 111 and output port 215 are all serial port, the first digital interface and the second number
Word interface is all serial line interface.
Working principle:
The circuit includes two transmission and two reception chains, for realizing in multiple output (Multiple Input Multiple Output) platforms
It is multiple.Two transmitters share a phaselocked loop and two receivers share another.Transmission and reception chain are all embodied as zero
Intermediate frequency architecture provides up to 112 MHz radio frequency modulation bandwidths (being equivalent to 56 megahertzs of 3 digital bandwidths of base band).For simplification
The purpose of this document is based on a transmission and a reception circuit to the explanation of the function and performance of chip, because other two
The identical of the working method of method is in transmission end, in the data sample of phase and orthogonal digital digital-to-analogue, from 3 processor of base band,
Circuit is supplied to by digital interface.The circuit realizes double data rate standard digital interface agreement and actual number
Multiplexing criteria.
Under digital multiplex mode, which also supports single data rate.Then, pass through digital transmitting and receiving signal processor 7
Sample is pre-processed, to carry out the smallest simulation/radio frequency distortion, and is applied to chip transmission digital analog converter 211.
Digital analog converter 211 generates analog and digital signal, is supplied to simulation/radio frequency part and is further processed.Transmission low-pass filter is gone
Except the image of the zero hold effect generation by digital analog converter 211 and the out-of-band noise of digital analog converter 211.It then will simulation
Digital signal is mixed with transmitting phaselocked loop output, generates the radiofrequency signal of modulation.Two independences of this radiofrequency signal and then amplification/
One of selectable 112 driver of power amplifier, two open leakage differences export each exported as radiofrequency signal
The path MIMO.The transmitter gain control range of 70db is by integrated digital transmitting and receiving signal processor 7 and receives power amplifier
Driver 24 provides.There are 1db gain step motion control in two stages.
This circuit provides a kind of radio frequency fallback option, it enable upstream radio-frequency signal signal feed back in base band 3 with
It is calibrated and is tested.Amplify radio frequency loopback signal by loopback amplifier, improves the dynamic range in circuit.
Two additional loops back functions are realized, one is the circulation of Analog Baseband 3, the other is digital loop-back, such as
Fig. 1 circuit for testing, and digital loop-back can be used for verifying at base band 3, field programmable gate array 6, digital transmitting and receiving signal
Manage device 7 or the unit connection of any other digital circuit.
In receiving end, three individually input the narrowband or width that the dedicated power amplifier 112 of offer one optimizes respectively
Band operation.Each end frequency signal is amplified by a programmable power amplifier 112 first.Then radiofrequency signal and reception are locked
The output mixing of phase ring, is converted to base band 3 directly down.Automatic Generation Control step can be by trans-impedance amplifier 114 programmable
Bandwidth low pass channel selects to realize before filter.Obtained digital signal is further amplified by programmable gain amplifier.?
The input of trans-impedance amplifier 114 uses direct current offset, to prevent from being saturated, and keeps receiving the dynamic range of analog-to-digital conversion.?
To simulation receive digital signal be converted into numeric field, analog-to-digital conversion is received on chip.After analogue to digital conversion, signal tune
Reason digital transmitting and receiving signal processor 7 (TSP) carries out, and is then provided by unit digital interface to Analog Baseband 3 generated
Signal.
This programme uses the advanced transceiver design based on CMOS technology, can be substantially reduced cost and power consumption.This programme
It is integrated with the double transceiver framework and important on piece digital function to support Multiple Input Multiple Output；It can be in any movement
It is run under communication standard and common mobile communication frequency, improves practicability；Make compared to RF transmit-receive circuit before in the market
Very big improvement, realizes and reaches lowest power consumption in similar-type products, extended frequency range, highest level it is integrated, more greatly
Design flexibility, meet the design requirement of NB-IoT, can be widely used in digital light distribution technique field.
The above description is only the embodiments of the present invention, and embodiment is used to understand the structure, function and effect of utility model
Fruit, the protection scope being not intended to limit the utility model.Various modifications and changes may be made to the present invention, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (8)
1. a kind of NB-IoT RF front-end circuit applied to digital light distribution, which is characterized in that including Peripheral Interface (41), micro-
Controller (42), clock phase-locked loop (43) and sequentially connected Dual channel transmission circuit unit (1), base band (3) and double-channel
Receiving circuit unit (2)；The microcontroller (42) respectively with Dual channel transmission circuit unit (1) and Dual channel reception circuit list
First (2) connection, the clock phase-locked loop (43) respectively with Dual channel transmission circuit unit (1) and Dual channel reception circuit unit
(2) it connects；The Peripheral Interface (41) connects with Dual channel transmission circuit unit (1) and Dual channel reception circuit unit (2) respectively
It connects；The base band (3) is provided with digital interface.
2. the NB-IoT RF front-end circuit according to claim 1 for being applied to digital light distribution, which is characterized in that described
Dual channel transmission circuit unit (1) include first transmission low-pass filter (13) and be connected in parallel and structure it is identical first pass
The both ends of transmission of electricity road (11) and the second transmission circuit (12), first transmission low-pass filter (13) are electric with the first transmission respectively
Road (11) and the second transmission circuit (12) connection.
3. the NB-IoT RF front-end circuit according to claim 2 for being applied to digital light distribution, which is characterized in that described
First transmission circuit (11) and the second transmission circuit (12) respectively include sequentially connected received signal strength indicator device (14), defeated
Enter circuit and transmission channel circuit, the input circuit includes three input ports (111), and each input port (111) is respectively
It is connected in series with corresponding power amplifier (112), and the input terminal of the last one power amplifier (112) and reception signal are strong
Indicator (14) connection is spent, the output end of three power amplifiers (112) is connect with the input terminal of transmission channel circuit；
The transmission channel circuit is connected in parallel including two and the identical transmission channel of structure, each transmission channel are distinguished
Including be sequentially connected in series low-converter (113), trans-impedance amplifier (114), the first low pass channel selection filter (115),
Self-induction gain controller (116) and analog-digital converter (117), input terminal and three power of the low-converter (113) are put
The output end connection of big device (112), the analog-digital converter (117) are connect by the first digital interface with base band (3)；Described
One transmission low-pass filter (13) both ends respectively with the low-converter (113) of the first transmission circuit (11) and the second transmission circuit
(12) low-converter (113) connection.
4. the NB-IoT RF front-end circuit according to claim 3 for being applied to digital light distribution, which is characterized in that described
Dual channel reception circuit unit (2) includes the second transmission low-pass filter (23) and is connected in parallel and structure identical first connects
It receives circuit (21) and second and receives circuit (22), the both ends of second transmission low-pass filter (23) receive electricity with first respectively
Road (21) and second receives circuit (22) connection.
5. the NB-IoT RF front-end circuit according to claim 4 for being applied to digital light distribution, which is characterized in that described
First reception circuit (21) and the second reception circuit (22) respectively include sequentially connected reception channel circuit and output circuit, institute
Stating and receiving channel circuit includes being connected in parallel and identical two reception channel of structure, and each reception channel is including successively going here and there
Join digital analog converter (211), the second low pass channel selection filter (212) and the upconverter (213) of connection, the upper change
The output end of frequency device (213) is connect with output circuit, and the digital analog converter (211) passes through the second digital interface and base band (3)
Connection；
Two output ports (215) of the output circuit, the input terminal and low noise amplifier of each output port (215)
(214) output end connection, the input terminal of each low noise amplifier (214) and the output of two upconverter (213)
End connection, and the output end of each low noise amplifier (214) respectively with receive power amplifier driver (24) and power supply
(25) it connects；
The upconverter (213) and that the both ends of second transmission low-pass filter (23) receive circuit (21) with first respectively
Two receive upconverter (213) connection of circuit (22).
6. the NB-IoT RF front-end circuit according to claim 5 for being applied to digital light distribution, which is characterized in that described
The both ends of microcontroller (42) connect with the first low pass channel of the second transmission circuit (12) selection filter (115) and first respectively
Receive the second low pass channel selection filter (212) connection of circuit (21), the both ends of the clock phase-locked loop (43) are respectively with the
Digital analog converter (211) connection of the analog-digital converter (117) of two transmission circuits (12) and the first reception circuit (21), peripheral hardware connect
Mouth (41) receives the upconverter (213) of circuit (21) with the low-converter (113) of the second transmission circuit (12) and first respectively
Connection.
7. the NB-IoT RF front-end circuit according to claim 1 for being applied to digital light distribution, which is characterized in that described
NB-IoT RF front-end circuit further includes digital winding (5), field programmable gate array (6) and digital receiving and transmitting signal processor
(7), the digital winding (5) is located at Dual channel transmission circuit unit (1) and Dual channel reception circuit unit (2) and base band (3)
Between, the digital winding (5) of stating is connect with field programmable gate array (6) and digital receiving and transmitting signal processor (7) respectively.
8. the NB-IoT RF front-end circuit according to claim 6 for being applied to digital light distribution, which is characterized in that described
Input port (111) and output port (215) are all serial port, and first digital interface and the second digital interface are all string
Line interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820963191.5U CN208424353U (en) | 2018-06-21 | 2018-06-21 | A kind of NB-IoT RF front-end circuit applied to digital light distribution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820963191.5U CN208424353U (en) | 2018-06-21 | 2018-06-21 | A kind of NB-IoT RF front-end circuit applied to digital light distribution |
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| Publication Number | Publication Date |
|---|---|
| CN208424353U true CN208424353U (en) | 2019-01-22 |
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ID=65108743
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820963191.5U Active CN208424353U (en) | 2018-06-21 | 2018-06-21 | A kind of NB-IoT RF front-end circuit applied to digital light distribution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208424353U (en) |
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2018
- 2018-06-21 CN CN201820963191.5U patent/CN208424353U/en active Active
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