CN102647200A - Radio frequency front-end receiving device, emitting device and terminal - Google Patents
Radio frequency front-end receiving device, emitting device and terminal Download PDFInfo
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- CN102647200A CN102647200A CN2011100404389A CN201110040438A CN102647200A CN 102647200 A CN102647200 A CN 102647200A CN 2011100404389 A CN2011100404389 A CN 2011100404389A CN 201110040438 A CN201110040438 A CN 201110040438A CN 102647200 A CN102647200 A CN 102647200A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details 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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details 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
- H04B1/005—Details 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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
Abstract
The invention relates to a radio frequency front-end receiving device, emitting device and terminal. The radio frequency front-end receiving device is characterized in that a broadband front-end filter and a parallel circuit are sequentially arranged between an antenna and a radio frequency chip, and the parallel circuit is connected with the broadband front-end filter in series; in the parallel circuit, a narrow-band front-end filter is connected with a conducting wire in parallel; and one end of the parallel circuit close to the broadband front-end filter is provided with a switch control circuit which is used for controlling a signal to pass through the narrow-band front-end filter or the conducting wire. The design difficulty and the cost can be reduced, and the radio frequency front-end receiving device solves the problems in the prior art that the design index requirement of the narrow-band front-end filter is higher; and a low-noise amplification device needs to be added, and the cost and the area of the radio frequency chip are increased and the like.
Description
Technical field
The present invention relates to radio-frequency front-end receiving system, emitter and terminal in the wireless domain.
Background technology
The common terminal chip frame structure sketch map of prior art is as shown in Figure 1; Comprise front end filter, power amplifier (PA), radio frequency chip and baseband chip; Wherein, The radio frequency chip of receiving unit is made up of LNA (LNA), demodulator, the amplifier (AMP) of Fig. 1 the first half, and the radio frequency chip of radiating portion is made up of amplifier, modulator, the filter of Fig. 1 the latter half; Baseband chip comprises analog to digital converter (ADC) and digital to analog converter (DAC) and digital baseband part.Generally speaking, if the successive bands of arrowband frequency range is the frequency range of model identical, like mode of frequency division duplexing (FDD), TDD mode (TDD), terminal radio frequency fore-end can only use the front end filter of a kind of broader bandwidth system.
But; As shown in Figure 2; When this terminal moves to narrower regional of the system bandwidth of other operators or regional same frequency range from the zone of system bandwidth broad (as move to the zone of 10MHz system bandwidth from the 20M system bandwidth), and successive bands is different mode, considers the interference of FDD system for the TDD system; Must increase the filter that is applicable to this narrower system bandwidth in the terminal radio frequency Front-end Design, with the influence of filtering FDD frequency range.
To this situation of Fig. 2; Traditional radio-frequency front-end method for designing adopts the structure of the front end filter parallel connection of a plurality of support different bandwidths; Structure before the receiving unit demodulator is as shown in Figure 3, needs in radio-frequency front-end and radio frequency chip, to increase respectively a switch, points to the front end filter of required bandwidth; Need increase the front end filter of supporting different bandwidth simultaneously, radio frequency chip also will increase corresponding LNA device (LNA) in addition.Structure after the radiating portion power amplifier is as shown in Figure 4, and the switch of increase points to the front end filter of required bandwidth, need increase the front end filter of some support different bandwidths simultaneously.
Traditional radio-frequency front-end method for designing; In Fig. 3 and Fig. 4 structure; Because the terminal is under narrower system bandwidth; Signal is only through supporting this front end filter filtering than narrow bandwidth, therefore has relatively high expectations (inhibition of its near-end and far-end requires all compare strictness) front end filter designing requirement difficulty height than the design objective of the front end filter of narrow bandwidth; And receiving unit needs extra increase LNA device (LNA), improved the cost and the area of radio frequency chip.
Summary of the invention
The objective of the invention is provides a kind of radio-frequency front-end receiving system, emitter and terminal in order to reduce design difficulty and cost.
To achieve these goals, according to an aspect of the present invention, a kind of radio-frequency front-end receiving system is provided, between the radio frequency chip, has been provided with the wideband frontend filter successively at antenna, and the parallel circuits of connecting with said wideband frontend filter; In the said parallel circuits, the arrowband front end filter is parallelly connected with lead, and contiguous said wideband frontend filter one end is provided with and is used for the ON-OFF control circuit of control signal through said arrowband front end filter or said lead in the said parallel circuits.
Preferably, said ON-OFF control circuit can comprise the single pole multiple throw that is used for control signal process said arrowband front end filter or said lead.
Preferably; The broadband frequency range front end filter of broadband frequency band filter that said wideband frontend filter is TDD mode TDD or mode of frequency division duplexing FDD, said arrowband front end filter can be the arrowband frequency range front end filter of arrowband frequency band filter or the mode of frequency division duplexing FDD of TDD mode TDD.
Preferably, contiguous said radio frequency chip one end can also be provided with another ON-OFF control circuit that cooperates control signal process said arrowband front end filter or lead with the ON-OFF control circuit of contiguous said wideband frontend filter in the said parallel circuits.
Preferably, being close to the ON-OFF control circuit of said radio frequency chip and the ON-OFF control circuit of contiguous said wideband frontend filter is the coordination circuit.
To achieve these goals, according to another aspect of the present invention, a kind of radio-frequency front-end emitter is provided, between the antenna, has been provided with the wideband frontend filter successively at power amplifier, and the parallel circuits of connecting with said wideband frontend filter; In the said parallel circuits, the arrowband front end filter is parallelly connected with lead, and contiguous said wideband frontend filter one end is provided with and is used for the ON-OFF control circuit of control signal through said arrowband front end filter or said lead in the said parallel circuits.
Preferably, said ON-OFF control circuit can comprise the single pole multiple throw that is used for control signal process said arrowband front end filter or said lead.
Preferably; The broadband frequency range front end filter of broadband frequency band filter that said wideband frontend filter is TDD mode TDD or mode of frequency division duplexing FDD, said arrowband front end filter can be the arrowband frequency range front end filter of arrowband frequency band filter or the mode of frequency division duplexing FDD of TDD mode TDD.
Preferably, contiguous said antenna one end can also be provided with another ON-OFF control circuit that cooperates control signal process said arrowband front end filter or lead with the ON-OFF control circuit of contiguous said wideband frontend filter in the said parallel circuits.
Preferably, being close to the ON-OFF control circuit of said radio frequency chip and the ON-OFF control circuit of contiguous said wideband frontend filter is the coordination circuit.
To achieve these goals, according to a further aspect of the invention, a kind of terminal is provided, has comprised above-mentioned any one radio-frequency front-end receiving system, radio-frequency front-end emitter, perhaps both combinations.
The present invention proposes a kind of radio-frequency front-end receiving system, radio-frequency front-end emitter and terminal; Through the wideband frontend filter and the parallel circuits of series connection are set; When in broadband system; The control signal of ON-OFF control circuit is front end filter without the arrowband, and signal only passes through the wideband frontend filter; When in narrowband systems and adjacent when frequently be different mode, the control signal of ON-OFF control circuit is passed through the wherein arrowband front end filter in the parallel circuits, and signal passes through wideband frontend filter and arrowband front end filter respectively.
Among the present invention, because the wideband frontend filter has carried out enough inhibition for far-end is spuious, so the far-end inhibition Capability Requirement of arrowband front end filter can reduce in reception and the emitter, thereby has reduced the radio frequency design index of arrowband front end filter; In addition,, reduced the quantity of the LNA in the radio frequency chip, so reduced the cost and the area of radio frequency chip with respect to the parallel-connection structure of prior art owing to connect with radio frequency chip in reception of the present invention and the emitter.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is a prior art terminal chip frame structure sketch map;
Fig. 2 moves to narrowband region for the terminal and adjacent frequency is the sketch map of different mode;
Fig. 3 is the receiving unit structure of radio-frequency front end sketch map of a plurality of support different bandwidths of prior art;
Fig. 4 is the radiating portion structure of radio-frequency front end sketch map of a plurality of support different bandwidths of prior art
Fig. 5 is radio-frequency front-end receiving system embodiment one structural representation of the present invention;
Fig. 6 is radio-frequency front-end receiving system embodiment two structural representations of the present invention;
Fig. 7 is radio-frequency front-end receiving system embodiment three structural representations of the present invention;
Fig. 8 is radio-frequency front-end emitter embodiment one structural representation of the present invention;
Fig. 9 is radio-frequency front-end emitter embodiment two structural representations of the present invention;
Figure 10 is radio-frequency front-end emitter embodiment three structural representations of the present invention.
Embodiment
Fig. 5 is radio-frequency front-end receiving system embodiment one structural representation of the present invention.As shown in Figure 5, the radio-frequency front-end receiving system of present embodiment comprises:
The wideband frontend filter, as shown in Figure 5, wideband frontend filtering one end links to each other with antenna, and the other end is connected with parallel circuits;
In the parallel circuits; The arrowband front end filter (N >=1) of N parallel connection; Each arrowband front end filter is all parallelly connected with the lead of a transmission signals; And contiguous wideband frontend filter one end is provided with ON-OFF control circuit in the parallel circuits, and this ON-OFF control circuit is used for control signal through lead or one of them arrowband front end filter.
Introduce the course of work of radio-frequency front-end receiving system of the present invention down below: in the TDD system that is in broader bandwidth (for example 20MHz); The ON-OFF control circuit control signal is pointed to A point shown in Figure 5, promptly the signal that receives of antenna through the wideband frontend filter filtering after direct-connected radio frequency chip to receiver; In being in the narrower system of a certain bandwidth (for example 10MHz) and adjacent frequent during for the TDD system, the ON-OFF control circuit control signal is pointed to A point shown in Figure 5, and the design of radio-frequency front-end receiving unit can shared wideband frontend filter; When (for example 10MHz) and adjacent frequency are for the FDD system in being in the narrower system of a certain bandwidth; The ON-OFF control circuit control signal is pointed among the B to K shown in Figure 5 wherein; The wideband frontend filter is connected with supporting a certain arrowband front end filter than narrow bandwidth; Be that the signal that antenna receives at first carries out filtering through the wideband frontend filter, and then, will be connected to radio frequency chip through the signal of twice filtering at last through after the further filtering of required arrowband front end filter.
It will be understood by a person skilled in the art that; The present invention not only is suitable for the TDD system; As shown in Figure 2; Move to the narrower zone (roam into other countries or operator like TD-LTE client, and roaming place TD-LTE distribution spectral bandwidth being narrower) of system bandwidth of other operators or regional same frequency range from the zone of TD-LTE system bandwidth broad, and the adjacent band is the situation of FDD; And be suitable for the narrower zone of system bandwidth that moves to other operators or regional same frequency range from the zone of FDD broader bandwidth and (roam into other countries or operator like CDMA client; And roaming place CDMA distribution spectral bandwidth is narrower); And the adjacent band is the situation of TDD, so long as from a kind of broadband system of pattern to narrowband systems, and adjacent when frequently being another kind of modular system; For fear of interference, all applicable the present invention.
Beneficial effect of the present invention: because the wideband frontend filter carried out enough inhibition for far-end is spuious, so the far-end of arrowband front end filter suppresses Capability Requirement and can reduce, thereby reduced the radio frequency design index of arrowband front end filter; In addition, reduced the quantity (support more system bandwidths, the minimizing quantity of corresponding LNA device is just more) of the LNA in the radio frequency chip, so reduced the cost and the area of radio frequency chip with respect to the parallel-connection structure of prior art.
It will be understood by a person skilled in the art that; The arrowband front end filter can be configured according to the situation of required support bandwidth; For example the TD-LTE system can be configured to 15/10/5/1.4MHz; The WCDMA system can dispose 5MHz, and the FDD-LTE system can be configured to 15/10/5/1.4MHz, also can increase the corresponding arrowband of parallel circuits front end filter branch road quantity according to the quantity of supporting bandwidth.
Fig. 6 is radio-frequency front-end receiving system embodiment two structural representations of the present invention.Fig. 7 is radio-frequency front-end receiving system embodiment three structural representations of the present invention.Fig. 6 is the only situation of an arrowband front end filter of parallel connection of parallel circuits, and Fig. 7 is lead and N the situation that the arrowband front end filter is parallelly connected.As shown in Figure 6, ON-OFF control circuit is a single-pole double-throw switch (SPDT), and the ON-OFF control circuit among Fig. 7 is a single pole multiple throw, and the number that the bar number of the control branch road of single pole multiple throw equals all arrowband front end filter adds 1 (lead branch road).
Like Fig. 6 and shown in Figure 7, contiguous radio frequency chip one end can also be provided with another ON-OFF control circuit in the parallel circuits, and can be the coordination circuit with the ON-OFF control circuit of contiguous wideband frontend filter.It will be understood by a person skilled in the art that; Coordination circuit as referred to herein is meant that radio-frequency front-end and radio frequency chip switch point to same front end filter according to the system works bandwidth; Like Fig. 6 and shown in Figure 7; Where the switch of the ON-OFF control circuit of contiguous wideband frontend filter is got to, and where also gets to away from this group switch of the ON-OFF control circuit of wideband frontend filter, connects thereby both coordinatioies guarantee same road front end filter.
Fig. 8 is radio-frequency front-end emitter embodiment one structural representation of the present invention; As shown in Figure 8, the radio-frequency front-end emitter of present embodiment comprises: the wideband frontend filter, and as shown in Figure 8; Wideband frontend filtering one end links to each other with power amplifier, and the other end is connected with parallel circuits; In the parallel circuits; The arrowband front end filter (N >=1) of N parallel connection; Each arrowband front end filter is all parallelly connected with the lead that is used for transmission signals; And contiguous wideband frontend filter one end is provided with ON-OFF control circuit in the parallel circuits, and this ON-OFF control circuit is used for control signal through lead or one of them arrowband front end filter.
Introduce the course of work of radio-frequency front-end emitter of the present invention down below: in the TDD system that is in broader bandwidth (for example 20MHz); The ON-OFF control circuit control signal is pointed to A point shown in Figure 8, promptly launches to antenna through the signal of power amplifier is direct-connected after through the wideband frontend filter filtering; In being in the narrower system of a certain bandwidth (for example 10MHz) and adjacent frequent during for the TDD system, the ON-OFF control circuit control signal is pointed to A point shown in Figure 8, and the design of radio-frequency front-end radiating portion can shared wideband frontend filter; When (for example 10MHz) and adjacent frequency are for the FDD system in being in the narrower system of a certain bandwidth; The ON-OFF control circuit control signal is pointed among the B to K shown in Figure 8 wherein; The wideband frontend filter is connected with supporting a certain arrowband front end filter than narrow bandwidth; Promptly the signal through power amplifier at first carries out filtering through the wideband frontend filter, and then through after the further filtering of required arrowband front end filter, will send to antenna through the signal of twice filtering at last and launch.
Fig. 9 is radio-frequency front-end emitter embodiment two structural representations of the present invention.Figure 10 is radio-frequency front-end emitter embodiment three structural representations of the present invention.Fig. 9 is the only situation of an arrowband front end filter of parallel connection of parallel circuits, and Figure 10 is lead and N the situation that the arrowband front end filter is parallelly connected.As shown in Figure 9, ON-OFF control circuit is a single-pole double-throw switch (SPDT), and the ON-OFF control circuit among Figure 10 is a single pole multiple throw, and the number that the bar number of the control branch road of single pole multiple throw equals all arrowband front end filter adds 1 (lead branch road).Like Fig. 9 and shown in Figure 10, contiguous radio frequency chip one end can also be provided with another ON-OFF control circuit in the parallel circuits, and can with the ON-OFF control circuit coordination of contiguous wideband frontend filter.
It will be understood by a person skilled in the art that; Radio-frequency front-end of the present invention receives or emitter; Its core devices is broadband filter and the parallel circuits that is connected in series; Just receiving system is between antenna and radio frequency chip in difference, and emitter is between power amplifier and antenna, and Fig. 5-Fig. 7 is for the same emitters that are suitable for such as configuration of the scope of application and arrowband front end filter.
The present invention also requires to protect a kind of terminal that comprises the arbitrary radio-frequency front-end receiving system of above-mentioned Fig. 5-Fig. 7; The perhaps terminal of any one radio-frequency front-end emitter of Fig. 8-Figure 10; Perhaps both any combination, because other parts can adopt the internal structure at prior art terminal, and more clearly the showing of Fig. 5-Figure 10 receives and the structure of emitter; Therefore, no longer drawn again in terminal of the present invention.
The terminal of the present invention's protection can be applied to support the scene of a plurality of TD-LTE bandwidth; The TD-LTE terminal is for operate as normal under the environment of narrower in system bandwidth and contiguous FDD frequency spectrum; Only need to increase ON-OFF control circuit and series filter according to the present invention, and the cascaded structure of filter makes the cost that design complexities reduces and reduces radio frequency chip at the terminal.Certainly also be applicable to the scene of supporting a plurality of CDMA bandwidth, can realize that the CDMA terminal is for operate as normal under the environment of narrower in system bandwidth and contiguous TDD frequency spectrum.
It should be noted last that; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although the present invention is specified with reference to preferred embodiment; Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the spirit and the scope of technical scheme of the present invention.
Claims (13)
1. a radio-frequency front-end receiving system is characterized in that, between the radio frequency chip, is provided with the wideband frontend filter at antenna successively, and the parallel circuits of connecting with said wideband frontend filter;
In the said parallel circuits, the arrowband front end filter is parallelly connected with lead, and contiguous said wideband frontend filter one end is provided with and is used for the ON-OFF control circuit of control signal through said arrowband front end filter or said lead in the said parallel circuits.
2. radio-frequency front-end receiving system according to claim 1 is characterized in that, said ON-OFF control circuit comprises the single pole multiple throw that is used for control signal process said arrowband front end filter or said lead.
3. radio-frequency front-end receiving system according to claim 1; It is characterized in that; The broadband frequency range front end filter of broadband frequency band filter that said wideband frontend filter is TDD mode TDD or mode of frequency division duplexing FDD, said arrowband front end filter are the arrowband frequency range front end filter of arrowband frequency band filter or the mode of frequency division duplexing FDD of TDD mode TDD.
4. according to each described radio-frequency front-end receiving system of claim 1-3; It is characterized in that contiguous said radio frequency chip one end also is provided with the ON-OFF control circuit of contiguous said wideband frontend filter and cooperates control signal another ON-OFF control circuit through said arrowband front end filter or lead in the said parallel circuits.
5. radio-frequency front-end receiving system according to claim 4 is characterized in that, the ON-OFF control circuit of contiguous said radio frequency chip is the coordination circuit with the ON-OFF control circuit of contiguous said wideband frontend filter.
6. a radio-frequency front-end emitter is characterized in that, between the antenna, is provided with the wideband frontend filter at power amplifier successively, and the parallel circuits of connecting with said wideband frontend filter;
In the said parallel circuits, the arrowband front end filter is parallelly connected with lead, and contiguous said wideband frontend filter one end is provided with and is used for the ON-OFF control circuit of control signal through said arrowband front end filter or said lead in the said parallel circuits.
7. radio-frequency front-end emitter according to claim 6 is characterized in that, said ON-OFF control circuit comprises the single pole multiple throw that is used for control signal process said arrowband front end filter or said lead.
8. radio-frequency front-end emitter according to claim 6; It is characterized in that; The broadband frequency range front end filter of broadband frequency band filter that said wideband frontend filter is TDD mode TDD or mode of frequency division duplexing FDD, said arrowband front end filter are the arrowband frequency range front end filter of arrowband frequency band filter or the mode of frequency division duplexing FDD of TDD mode TDD.
9. according to each described radio-frequency front-end emitter of claim 6-8; It is characterized in that contiguous said antenna one end also is provided with the ON-OFF control circuit of contiguous said wideband frontend filter and cooperates control signal another ON-OFF control circuit through said arrowband front end filter or lead in the said parallel circuits.
10. radio-frequency front-end emitter according to claim 9 is characterized in that, the ON-OFF control circuit of contiguous said radio frequency chip is the coordination circuit with the ON-OFF control circuit of contiguous said wideband frontend filter.
11. a terminal is characterized in that, comprises any described radio-frequency front-end receiving system of aforesaid right requirement 1-5.
12. a terminal is characterized in that, comprises each described radio-frequency front-end emitter of aforesaid right requirement 6-10.
13. terminal; It is characterized in that; Comprise any described radio-frequency front-end receiving system of aforesaid right requirement 1-5; And each described radio-frequency front-end emitter of claim 6-10, said radio-frequency front-end receiving system is connected with baseband chip with the middle radio frequency chip through series connection of said radio-frequency front-end emitter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100404389A CN102647200A (en) | 2011-02-18 | 2011-02-18 | Radio frequency front-end receiving device, emitting device and terminal |
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| CN2011100404389A CN102647200A (en) | 2011-02-18 | 2011-02-18 | Radio frequency front-end receiving device, emitting device and terminal |
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| CN102647200A true CN102647200A (en) | 2012-08-22 |
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| CN2011100404389A Pending CN102647200A (en) | 2011-02-18 | 2011-02-18 | Radio frequency front-end receiving device, emitting device and terminal |
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| CN106788311A (en) * | 2016-11-30 | 2017-05-31 | 宇龙计算机通信科技(深圳)有限公司 | A kind of terminal capabilities improves circuit and mobile terminal |
| CN109818643A (en) * | 2019-03-07 | 2019-05-28 | 维沃移动通信有限公司 | Adjusting method, radio circuit and the terminal of radio circuit |
| CN115441881A (en) * | 2022-07-21 | 2022-12-06 | 海能达通信股份有限公司 | Linkage antenna circuit and terminal |
| CN115441881B (en) * | 2022-07-21 | 2024-01-16 | 海能达通信股份有限公司 | Linkage antenna circuit and terminal |
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Application publication date: 20120822 |