CN107302383A - Compatible TDD and FDD LTE radio transmission circuit - Google Patents

Compatible TDD and FDD LTE radio transmission circuit Download PDF

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Publication number
CN107302383A
CN107302383A CN201710595422.1A CN201710595422A CN107302383A CN 107302383 A CN107302383 A CN 107302383A CN 201710595422 A CN201710595422 A CN 201710595422A CN 107302383 A CN107302383 A CN 107302383A
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CN
China
Prior art keywords
interface
component
selection component
selection
pad
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Granted
Application number
CN201710595422.1A
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Chinese (zh)
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CN107302383B (en
Inventor
郑耀华
钟伟东
范莉
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Comba Network Systems Co Ltd
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Comba Telecom Technology Guangzhou Ltd
Comba Telecom Systems China Ltd
Comba Telecom Systems Guangzhou Co Ltd
Tianjin Comba Telecom Systems Co Ltd
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Priority to CN201710595422.1A priority Critical patent/CN107302383B/en
Publication of CN107302383A publication Critical patent/CN107302383A/en
Application granted granted Critical
Publication of CN107302383B publication Critical patent/CN107302383B/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40Circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40Circuits
    • H04B1/401Circuits for selecting or indicating operating mode
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/14Two-way operation using the same type of signal, i.e. duplex
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/14Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469Two-way operation using the same type of signal, i.e. duplex using time-sharing

Abstract

The present invention provides a kind of compatible TDD and FDD LTE radio transmission circuit, including antenna, selection component set, duplexing component, filtering unit, barrier assembly, RF receiving circuit and radio frequency transmitter circuitry, component set is selected to 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, is the LTE radio transmitting-receiving that compatibility TDD and FDD can be achieved without complicated circuit structure.In addition, it is that can access/change duplexing component, filtering unit, barrier assembly, RF receiving circuit and the radio frequency transmitter circuitry of different model as needed to select each interface of component, meets the LTE wireless receiving and dispatching demands of the multiple frequency range application under compatibility TDD and fdd mode.

Description

Compatible TDD and FDD LTE radio transmission circuit
Technical field
The present invention relates to communication technical field, more particularly to compatibility TDD (Time Division Duplexing, time-division Duplex) with FDD (Frequency Division Duplexing, FDD) LTE (Long Term Evolution, it is long Phase evolution) RF transmit-receive circuit.
Background technology
With the development of 4G-LTE mobile communications networks, the demand sharp increase of small-power focus covering, and it may be selected Wireless frequency spectrum variation and different mode in the case of, pair can multifrequency multiplexing and the small-power of compatibility TDD and fdd mode, it is low into Originally, the demand of the LTE radio transceiver of small size is more and more urgent.In order to save the design cost of RF hardware and reduce radio frequency The design cycle of hardware, the radio frequency transceiver of LTE communication equipment does not require nothing more than compatible mode of frequency division duplexing and TDD mode, And a variety of working frequency range can be supported, further to reduce LTE communication equipment investment R&D costs and cycle.Meanwhile, the radio frequency Transceiver also need to small volume, lightweight, performance it is good and compatible strong the characteristics of.
Generally for the multimode multifrequency transceiver for being capable of compatibility FDD and tdd mode mentality of designing mainly to different frequencies The fdd mode and tdd mode of section have multiple receiving modules and multiple simultaneously using different transceiver modules, the i.e. circuit respectively Transmitter module, the implementation application is flexible, it is evident that its circuit is complicated, cost is high, volume is big, can not meet The demand of the Miniature communication system increasingly developed.
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.
Brief description of the drawings
Fig. 1 is the structural representation of compatibility TDD and FDD of the invention LTE radio transmission circuit one embodiment;
Signal under tdd mode in the one of embodiment of LTE radio transmission circuit that Fig. 2 is compatibility TDD and FDD of the invention Flow to schematic diagram;
Signal under fdd mode in the one of embodiment of LTE radio transmission circuit that Fig. 3 is compatibility TDD and FDD of the invention Flow to schematic diagram;
Fig. 4 is selection modular construction schematic diagram;
Fig. 5 is the structural representation of compatibility TDD and FDD of the invention second embodiment of LTE radio transmission circuit;
Signal under tdd mode in the one of embodiment of LTE radio transmission circuit that Fig. 6 is compatibility TDD and FDD of the invention Flow to schematic diagram;
Signal under fdd mode in the one of embodiment of LTE radio transmission circuit that Fig. 7 is compatibility TDD and FDD of the invention Flow to schematic diagram.
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.

Claims (8)

1. a kind of compatible TDD and FDD LTE radio transmission circuit, it is characterised in that including antenna, selection component set, duplexing group Part, filtering unit, barrier assembly, the first RF switch, the second RF switch, RF receiving circuit and radio frequency transmitter circuitry;
The selection component set includes first choice component, the second selection component, the 3rd selection component, the 4th selection component, the Each selection component is respectively arranged with five selection components, the 6th selection component and the 7th selection component, the selection component set First interface, second interface and the 3rd interface;
The antenna is connected with the first interface of the first choice component, the second interface of the first choice component with it is described Duplexing component connection, the 3rd interface of the first choice component is connected with the filtering unit, the filtering unit with it is described The first port connection of first RF switch, the duplexing component is connected with the second interface of the described second selection component, described The first interface of second selection component is connected with the first interface of the described 3rd selection component, and the 3rd of the second selection component the Interface is connected with the second port of first RF switch, second interface and the described 4th selection of the 3rd selection component The second interface connection of component, the first port of the 3rd interface and second RF switch of the 3rd selection component connects Connect, the second port of second RF switch is connected with the 3rd interface of the described 4th selection component, the 4th selection group The first interface of part is connected with the RF receiving circuit, and the 3rd interface of the 5th selection component is opened with first radio frequency The 3rd port connection closed, the second interface of the 5th selection component is connected with the duplexing component, the 5th selection group The first interface of part with the described 6th selection component first interface be connected, it is described 6th select component second interface with it is described Barrier assembly is connected, and the 3rd interface of the 6th selection component is connected with the 3rd interface of the described 7th selection component, described The second interface of 7th selection component is connected with the barrier assembly, the first interface and the radio frequency of the 7th selection component Radiating circuit is connected;
When in tdd mode, in the selection component set first interface of each selection component respectively with corresponding 3rd interface Conducting, when in fdd mode, in the selection component set first interface of each selection component respectively with corresponding second interface Conducting.
2. compatible TDD and FDD according to claim 1 LTE radio transmission circuit, it is characterised in that the selection group Part concentrates each selection component also to include the first radio frequency path electric capacity pad and the second radio frequency path electric capacity pad of orthogonal setting, institute Stating the first radio frequency path electric capacity pad includes the first pad and the second pad, and the second radio frequency path electric capacity pad includes the 3rd Pad and the 4th pad;
First pad, for welding outside first radio frequency path electric capacity, the 4th pad is penetrated for welding outside second Frequency path capacitance, second pad and the 3rd pad stitch welding, form stitch welding disk;
The first interface is connected with the stitch welding disk, and the second interface is connected with first pad, the 3rd interface It is connected with the 4th pad.
3. compatible TDD and FDD according to claim 1 LTE radio transmission circuit, it is characterised in that also including load, The load is connected with the 3rd port of second RF switch.
4. compatible TDD and FDD according to claim 3 LTE radio transmission circuit, it is characterised in that the load bag Include 50 ohm of load.
5. compatible TDD and FDD according to claim 1 LTE radio transmission circuit, it is characterised in that the radio frequency connects Receive low noise amplifier, the first wave filter, the first frequency mixer and analog-digital converter that circuit includes being sequentially connected, the LNA Big device is connected with the 3rd interface of the described 4th selection component.
6. compatible TDD and FDD according to claim 1 LTE radio transmission circuit, it is characterised in that the radio frequency hair Transmit-receive radio road includes power amplifier, the second wave filter, the second frequency mixer and the digital analog converter being sequentially connected, and the power is put Big device is connected with the first interface of the described 7th selection component.
7. the LTE radio transmission circuit of the compatible TDD and FDD according to claim 5 or 6, it is characterised in that when in During tdd mode, first frequency mixer uses same local frequency with second frequency mixer.
8. the LTE radio transmission circuit of the compatible TDD and FDD according to claim 5 or 6, it is characterised in that when in During fdd mode, first frequency mixer uses independent local frequency with second frequency mixer, and first frequency mixer is used Up local frequency, the second frequency mixer uses descending local frequency.
CN201710595422.1A 2017-07-20 2017-07-20 LTE radio frequency transceiver circuit compatible with TDD and FDD Active CN107302383B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108377172A (en) * 2018-02-26 2018-08-07 广东小天才科技有限公司 A kind of time-division and frequency division multiplexing circuit evolving method and device

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