The content of the invention
Based on this, it is necessary to for general compatibility TDD and FDD LTE radio transmission circuit it is complicated the problem of there is provided
A kind of compatible TDD simple in construction and FDD LTE radio transmission circuit.
A kind of compatible TDD and FDD LTE radio transmission circuit, including antenna, selection component set, duplexing component, filtering group
Part, barrier assembly, the first RF switch, the second RF switch, RF receiving circuit and radio frequency transmitter circuitry;
Component set is selected to include first choice component, the second selection component, the 3rd selection component, the 4th selection component, the
Each selection component is respectively arranged with first in five selection components, the 6th selection component and the 7th selection component, selection component set
Interface, second interface and the 3rd interface;
Antenna is connected with the first interface of first choice component, and the second interface of first choice component connects with duplexing component
Connect, the 3rd interface of first choice component is connected with filtering unit, and filtering unit is connected with the first port of the first RF switch,
Duplexing component be connected with the second interface of the second selection component, and the first interface and the 3rd of the second selection component selects the of component
One interface is connected, and the 3rd interface of the second selection component is connected with the second port of the first RF switch, the 3rd selection component
Second interface be connected with the second interface of the 4th selection component, and the 3rd selects the of the 3rd interface of component and the second RF switch
Single port is connected, and the second port of the second RF switch is connected with the 3rd interface of the 4th selection component, the 4th selection component
First interface is connected with RF receiving circuit, and the 3rd interface of the 5th selection component and the 3rd port of the first RF switch connect
Connect, the second interface of the 5th selection component is connected with duplexing component, the first interface of the 5th selection component and the 6th selection component
First interface connection, the 6th selection component second interface be connected with barrier assembly, the 6th select component the 3rd interface and
The 3rd interface connection of 7th selection component, the second interface of the 7th selection component is connected with barrier assembly, the 7th selection component
First interface be connected with radio frequency transmitter circuitry;
When in tdd mode, in selection component set the first interface of each selection component respectively with corresponding 3rd interface
Conducting, when in fdd mode, the first interface of each selection component is led with corresponding second interface respectively in selection component set
It is logical.
Compatibility TDD and FDD of the invention LTE radio transmission circuit, including antenna, selection component set, duplexing component, filtering
Component, barrier assembly, RF receiving circuit and radio frequency transmitter circuitry, selection component set include multiple selection components, when in
When under tdd mode, the first interface of each selection component is turned on corresponding 3rd interface respectively;When in fdd mode, selection
The first interface of each selection component is turned on corresponding second interface respectively in component set, can be real without complicated circuit structure
Existing compatibility TDD and FDD LTE radio transmitting-receiving.In addition, selection component each interface be can access as needed/change difference
Duplexing component, filtering unit, barrier assembly, RF receiving circuit and the radio frequency transmitter circuitry of model, meet compatibility TDD with
The LTE wireless receiving and dispatching demands of multiple frequency range application under fdd mode.
Embodiment
As shown in figure 1, a kind of compatible TDD and FDD LTE radio transmission circuit, including it is antenna 100, selection component set, double
Work component 300, filtering unit 400, barrier assembly 500, the first RF switch 600, the second RF switch 700, radio frequency reception electricity
Road 800 and radio frequency transmitter circuitry 900;
Select component set to include the selection selection component the 230, the 4th of component the 220, the 3rd of first choice component 210, second to select
Select and respectively selected in the selection selection selection component 270 of component 260 and the 7th of component the 250, the 6th of component the 240, the 5th, selection component set
Select component and be respectively arranged with first interface, second interface and the 3rd interface;
Antenna 100 is connected with the first interface of first choice component 210, the second interface of first choice component 210 with it is double
Work component 300 is connected, and the 3rd interface of first choice component 210 is connected with filtering unit 400, and filtering unit 400 is penetrated with first
The first port connection of frequency switch 600, duplexing component 300 is connected with the second interface of the second selection component 220, the second selection group
The first interface of part 220 be connected with the first interface of the 3rd selection component 230, and second selects the 3rd interface of component 220 and the
The second port connection of one RF switch 600, the second interface of the 3rd selection component 230 and the second of the 4th selection component 240
Interface is connected, and the 3rd interface of the 3rd selection component 230 is connected with the first port of the second RF switch 700, and the second radio frequency is opened
The second port for closing 700 is connected with the 3rd interface of the 4th selection component 240, and the first interface of the 4th selection component 240 is with penetrating
Frequency receiving circuit 800 is connected, and the 3rd interface of the 5th selection component 250 is connected with the 3rd port of the first RF switch 600, the
The second interface of five selection components 250 is connected with duplexing component 300, the first interface of the 5th selection component 250 and the 6th selection
The first interface connection of component 260, the second interface of the 6th selection component 260 is connected with barrier assembly 500, the 6th selection component
260 the 3rd interface is connected with the 3rd interface of the 7th selection component 270, and the second interface of the 7th selection component 270 is with isolating
Component 500 is connected, and the first interface of the 7th selection component 270 is connected with radio frequency transmitter circuitry 900;
When in tdd mode, in selection component set the first interface of each selection component respectively with corresponding 3rd interface
Conducting, when in fdd mode, the first interface of each selection component is led with corresponding second interface respectively in selection component set
It is logical.
Antenna 100 is used to launch and receive external electromagnetic waves signal.Duplexing component 300 is specifically as follows duplexer, duplex
Device is alien frequencies two-way radios, is the key fitment of trunk desk, its act on be will transmitting and receive signal be isolated, it is ensured that receive and
Transmitting can be while normal work.Filtering unit 400 is specifically as follows wave filter, and it is used to filter out the clutter in link.Isolation
Component 500 can be isolator, it is used to signal carrying out secondary isolation so that signal point to needed for direction transmission (in Fig. 1 every
From arrow direction in device).RF switch belongs to cable television network or communication field signaling switch, for wire transmission radio frequency
Signal by control, be to be made up of shell and two crystal diodes and auxiliary circuit connected input, output and control end,
One crystal diode is series at AC signal passage, and another diode is with connecting signalling channel and AC signal, has
It is simple in construction, using scope is wide, cost is low, power consumption is low, it is easily installed, the advantages of reliability is high, can be widely used for carrier wave electricity
The fields such as words switching, cable TV signal switching, cable TV signal switch.RF receiving circuit 800 is used to receive up letter
Number, specifically, RF receiving circuit 800 can include low noise amplifier, the first wave filter, the first frequency mixer being sequentially connected
And analog-digital converter.Radio frequency transmitter circuitry 900 is used to launch downstream signal, and specifically, radio frequency transmitter circuitry 900 can be wrapped
Include the power amplifier being sequentially connected, the second wave filter, the second frequency mixer and digital analog converter.
Selection component set be to it is multiple selection components general name, each selection component include first interface, second interface with
And the 3rd interface, selection component can select first interface that first interface and the 3rd is turned on or selected with second interface as needed
Interface is turned on, so as to realize control and switching.In addition, in compatibility TDD and FDD of the invention LTE radio transmission circuit, antenna
100th, duplexing component 300, filtering unit 400, barrier assembly 500, the first RF switch 600, the second RF switch 700, radio frequency
Tie point between receiving circuit 800 and radio frequency transmitter circuitry 900 is provided with selection component, according to current application environment
Needing can be with the antenna 100 of convenient changing different model (working frequency range), duplexing component 300, filtering unit 400, barrier assembly
500th, the first RF switch 600, the second RF switch 700, RF receiving circuit 800 and radio frequency transmitter circuitry 900.
Compatibility TDD and FDD of the invention LTE radio transmission circuit, including antenna 100, selection component set, duplexing component
300th, filtering unit 400, barrier assembly 500, RF receiving circuit 800 and radio frequency transmitter circuitry 900, selection component set include
Multiple selection components, when under tdd mode, the first interface of each selection component is turned on corresponding 3rd interface respectively;
When in fdd mode, the first interface of each selection component is turned on corresponding second interface respectively in selection component set, without
Complicated circuit structure is the LTE radio transmitting-receiving that compatibility TDD and FDD can be achieved.In addition, each interface of selection component is can root
According to needing duplexing component 300, filtering unit 400, barrier assembly 500, the RF receiving circuit 800 of access/replacing different model
And radio frequency transmitter circuitry 900, meet the LTE wireless receiving and dispatching demands of the multiple frequency range application under compatibility TDD and fdd mode.
For the concrete structure and its work of the LTE radio transmission circuit that further describes compatibility TDD and FDD of the invention in detail
Make below process, will be illustrated using instantiation and with reference to Fig. 2 and Fig. 3.For selection component in Fig. 2 and Fig. 3
Interface have further mark, wherein first interface is illustrated with a, its second interface is illustrated with b, its 3rd interface is illustrated with c.
As shown in Fig. 2 in tdd mode:
Up-link, the first interface a of 100 → first choice of the antenna component 210 → interface c of first choice component 210 the 3rd
The RF switch 600 → the second of → filtering unit 400 → the first selection component 220 the 3rd interface c → second selects component 220 first
The RF switch of selection component 230 the 3rd interface c of the selection component 230 of interface a → 3rd first interface a → 3rd → second 700 →
4th selection component 240 the 3rd interface c → 4th selects the first interface a of component 240 → Receiver Module 800.
Downlink, selection component 270 first interface a → the seven selection of radiofrequency emitting module 900 → the seven component 270 the
Three interface c → 6th selects the interface c of component 260 the 3rd → 6th to select the first interface a of component 260 → 5th to select component 250
RF switch 600 → filtering unit, the 400 → first choice group of the selection component 250 the 3rd of first interface a → 5th interface c → first
The interface c of part 210 the 3rd → first interface a of first choice component 210 → antenna 100.
As shown in figure 3, in the fdd mode:
Up-link, the first interface a of 100 → first choice of the antenna component 210 → second interface b of first choice component 210
The selection group of the selection component 220 first interface a of → duplexing selection component 220 of component 300 → the second second interface b → second → the 3rd
The first interface a of part 230 → 3rd selects the second interface b of component 230 → 4th to select the second interface b of component 240 → 4th to select
The first interface a of component 240 → Receiver Module 800.
Downlink, selection component 270 first interface a → the seven selection of radiofrequency emitting module 900 → the seven component 270 the
Two interface b → isolator 500 → 6th selects the second interface b of component 260 → 6th to select first interface a → 5th of component 260
The first interface a of component 250 → 5th is selected to select the second interface b of component 250 → duplex 300 → first choice of component component 210
The first interface a of second interface b → first choice component 210 → antenna 100.
As shown in figure 4, in one of the embodiments, in selection component set each selection component also including orthogonal setting the
One radio frequency path electric capacity pad 21 and the second radio frequency path electric capacity pad 22, the first radio frequency path electric capacity pad include the first pad
21-1 and second pad the second radio frequency path electric capacity pad 22 include the 3rd pad and the 4th pad 22-4;First pad 21-1,
For welding outside first radio frequency path electric capacity, the 4th pad 22-4 is used to weld outside second radio frequency path electric capacity, the second weldering
Disk and the 3rd pad stitch welding, form stitch welding disk 23;First interface a is connected with stitch welding disk 23, second interface b and the first pad 21-1
Connection, the 3rd interface c is connected with the 4th pad 22-4.
In the present embodiment, each selection component is identical structure, its including first interface, second interface and
The first radio frequency path electric capacity pad 21 (dotted line frame in Fig. 4) and the second radio frequency path outside 3rd interface also including orthogonal setting
Electric capacity pad 22 (dotted line frame in Fig. 4), the first radio frequency path electric capacity pad includes the first pad 21-1 and the second pad, and second penetrates
Frequency path capacitance pad includes the 3rd pad and the 4th pad 22-4, the second pad and the 3rd pad stitch welding, forms stitch welding disk, the
The first radio frequency path electric capacity can be welded on one pad 21-1 as needed, when being welded with the first radio frequency path on the first pad
During electric capacity, first interface is turned on second interface;The second radio frequency electric capacity can be welded on 4th pad 22-4 as needed, when
When being welded with the second radio frequency path electric capacity on the 4th pad, first interface and the 3rd interface are turned on.For more progressive one, in selection
In component, the first radio frequency path electric capacity pad and the second radio frequency path electric capacity pad of two big small packages of same size are distinguished just
Hand over, and a pad of two radio frequency path electric capacity pads overlaps each other pad, so as to realize that selection is different on radio frequency path
Signal is flowed to, when selecting a wherein radio frequency path, the radio frequency path electric capacity pad solder radio frequency path electric capacity on the road, and is weighed
The radio frequency path electric capacity of another radio frequency path electric capacity pad of stitch welding disk is default.
As shown in figure 5, in one of the embodiments, compatible TDD and FDD LTE radio transmission circuit also include load,
Load is connected with the 3rd port of the second RF switch 700.
Load and the co-ordination of the second RF switch 700 can be effectively increased the isolation of up-downgoing under tdd mode.It is non-must
Want, load can select 50 ohm of load.
As shown in figure 5, in one of the embodiments, low noise amplifier that RF receiving circuit 800 includes being sequentially connected,
3rd interface of the first wave filter, the first frequency mixer and analog-digital converter, low noise amplifier and the 4th selection component 240 connects
Connect.
RF receiving circuit 800 can use the RF receiving circuit 800 of zero intermediate frequency scheme, when TDD-LTE working frequency range
During for 2300MHz~2400MHz, the second frequency mixer is used is with the same local frequency of the first frequency mixer, local frequency
2350MHz;When the up working frequencies of FDD-LTE be 1920MHz~1980MHz when, the first frequency mixer use local frequency for
1940MHz frequency mixer;When FDD-LTE downlink workings frequency is 2110MHz~2170MHz, the second frequency mixer is using local oscillator frequency
Rate is 2140MHz frequency mixer.
As shown in figure 5, in one of the embodiments, power amplifier that radio frequency transmitter circuitry 900 includes being sequentially connected,
The first interface of second wave filter, the second frequency mixer and digital analog converter, power amplifier and the 7th selection component 270 connects
Connect.
Radio frequency transmitter circuitry 900 can use the radio frequency transmitter circuitry 900 of zero intermediate frequency scheme, when TDD-LTE working frequency range
During for 2300MHz~2400MHz, the second frequency mixer uses local frequency for 2350MHz frequency mixer;When the up works of FDD-LTE
When working frequency is 1920MHz~1980MHz, the second frequency mixer uses local frequency for 1940MHz frequency mixer.
Structure for the LTE radio transmission circuit that further explains in detail compatibility TDD and FDD of the invention and its worked
Journey, will be respectively adopted the two instantiations progress expansion explanation for working in tdd mode and fdd mode below.
When compatibility TDD and FDD of the invention LTE radio transmission circuit works under tdd mode, as shown in fig. 6, its work
Make frequency range for TDD-LTE band40 frequency ranges (2300MHz~2400MHz), using the radio frequency transceiver of zero intermediate frequency scheme.Radio frequency
The downlink operation process of transceiver is:Baseband digital signal is converted to analog signal by digital analog converter, is believed by local oscillator
Number for 2350MHz the second frequency mixer carry out uppermixing, signal after filtering device filtering after put with the power of corresponding working frequency range
Big device connection, radiofrequency signal is amplified, the signal by amplification is passed by the first RF switch 600 in TDD descending time slots
After the defeated wave filter to correspondence working frequency range, launched by antenna 100.The up-link course of work of radio frequency transceiver
For:Wireless signal is filtered after antenna 100 is received by the wave filter of correspondence working frequency range and bandwidth of operation, the
Radio signal transmission of one RF switch 600 after TDD ascending time slots are switched to the second RF switch 700 is to low-noise amplifier
Signal is amplified, after the wave filter that the signal after amplification is transferred to correspondence working frequency range and bandwidth of operation, by local oscillator
Signal carries out lower mixing for 2350MHz the first frequency mixer, and the analog signal Jing Guo lower mixing is turned by analog-digital converter ADC
It is changed to baseband digital signal.Wherein, in the present embodiment, the first choosing of compatibility TDD and FDD of the invention LTE radio transmission circuit
Select the selection of component 210, second component 220, the 3rd selection component 230, the 4th selection component 240, the 5th selection component 250, the
First interface and the 3rd interface are turned in the six selection selection components 270 of component 260 and the 7th, and the first pad is welded in selection component
Radio frequency path electric capacity is connected to, using above-mentioned stitch welding disk technology, duplexer progress is default, and isolator carries out default.Second radio frequency
Switch 700 increases by 50 ohm loads at the second RF switch 700 in tdd mode in order to increase TDD up-downgoing isolations.
Meanwhile, can be by selecting the work(changed at component interface with encapsulation different operating frequency range and bandwidth of operation at each in the present embodiment
Energy module device realizes the multiplexing of a variety of working frequency range of application in tdd mode.
When compatibility TDD and FDD of the invention LTE radio transmission circuit works under fdd mode, as shown in fig. 7, its work
It is that (up working frequency range is FDD-LTE Band1 frequency ranges to make frequency range:1920MHz~1980MHz;Downlink working frequency range is:
2110MHz~2170MHz), using the radio frequency transceiver of zero intermediate frequency scheme.The downlink operation process of radio frequency transceiver is:
Baseband digital signal is converted to analog signal by digital analog converter DAC, is entered by local oscillation signal for 2140MHz the second frequency mixer
Row uppermixing, power amplification of the signal after the filter filtering of correspondence working frequency range and bandwidth of operation with corresponding working frequency range
Device is connected, and radiofrequency signal is amplified, the signal by amplification is connected by isolator with the first RF switch 600, is passed through
The downlink of the duplexer of correspondence working frequency range, last signal is launched by antenna 100.The uplink of radio frequency transceiver
The road course of work is:Wireless signal is transmitted directly to after antenna 100 is received by the duplexer of correspondence working frequency range
Signal is amplified by low-noise amplifier, and the signal after amplification is transferred to the wave filter of correspondence working frequency range and bandwidth of operation
Afterwards, lower mixing is carried out for 1940MHz the first frequency mixer by local oscillation signal, the analog signal Jing Guo lower mixing is passed through into modulus
Converter ADC is converted to baseband digital signal.Wherein, in the present embodiment, compatibility TDD and FDD of the invention LTE radio transmitting-receiving electricity
The selection selection selection component the 240, the 5th of component the 230, the 4th of component the 220, the 3rd of first choice component 210, second on road is selected
First interface and second interface are turned in the selection selection component 270 of component 260 and the 7th of component the 250, the 6th, in selection component
4th pad solder has radio frequency path electric capacity, and using above-mentioned stitch welding disk technology, wave filter carries out default, the first RF switch
600th, the second RF switch 700 and corresponding 50 ohm load are default.Meanwhile, can be by selecting component at each in the present embodiment
Interface change realizes that application in the fdd mode is a variety of with the functional module device of encapsulation different operating frequency range and bandwidth of operation
The multiplexing of working frequency range.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.