CN103795432A - High-linearity multimode radio frequency antenna switch circuit - Google Patents
High-linearity multimode radio frequency antenna switch circuit Download PDFInfo
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- CN103795432A CN103795432A CN201410085417.2A CN201410085417A CN103795432A CN 103795432 A CN103795432 A CN 103795432A CN 201410085417 A CN201410085417 A CN 201410085417A CN 103795432 A CN103795432 A CN 103795432A
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Abstract
The invention relates to the technical field of wireless communication, and discloses a high-linearity multimode radio frequency antenna switch circuit which comprises an antenna, a plurality of switch branch circuits and a plurality of signal receiving and sending ends. Each signal receiving and sending end is coupled to the antenna through a corresponding switch branch circuit, and each switch branch circuit is a laminated serial structure formed by a plurality of transistor components. In each switch branch circuit, the two front transistor components closest to the antenna are respectively connected in parallel with a gating capacitor. An inter-modulation restraining structure is designed to be in the radio frequency switch circuit, inter-modulation restraining elements are added, when radio frequency signals pass through a radio frequency switch, the radio frequency restraining elements can effectively restrain second-order inter-modulation and third-order inter-modulation, the linearity of the radio frequency antenna switch is obviously improved, and receiving sensitivity of the overall system is substantially improved.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly, relate to a kind of high linearity multi-mode radio frequency antenna switch circuit.
Background technology
Along with the development of Modern wireless communication technology, various wireless communication standard the situation of depositing are there is, as belong to the GSM(Global System for Mobile communications of 2G standard, global system for mobile communications), CDMA(Code Division Multiple Access, code division multiple access) etc., belong to the WCDMA(Wideband Code Division Multiple Access of 3G standard, Wideband Code Division Multiple Access (WCDMA)), UMTS(Universal Mobile Telecommunications System, universal mobile telecommunications system) etc., and belong to the LTE(Long Term Evolution of 4G standard, Long Term Evolution) etc.Because the communication standard of each standard differs, for realizing the communication between different systems, multimode technology is incorporated into these wireless communication standards in same multimode handheld terminal, makes the same portion multimode handheld terminal above-mentioned communication standard of compatibility simultaneously.Because the frequency range of above-mentioned communication standard is different, require multi-mode radio frequency duplexer must cover the whole operating frequency of above-mentioned standard.Multi-mode radio frequency duplexer is the important component part of multimode handheld terminal RF front-end module, for the antenna of handheld terminal being linked into radio-frequency transmissions path and radio frequency reception path.
Meanwhile, in the communication system of modern multimode multi-frequency section, due to the radio-frequency power amplifier of the multiple communication standards of radio-frequency antenna switch control, radio frequency interference is very serious each other.Be the circuit diagram of multi-mode radio frequency duplexer in prior art as shown in Figure 1, can find out, in existing mode, multiple radiofrequency signals sending and receiving end TRX1, TRX2 and TRX3 are directly coupled to line end on the same day by a radio-frequency (RF) switch branch road separately.Take GSM/WCDMA multi mode terminal more on market as example, in the time that WCDMA signal of communication is launched by duplexer, extraneous GSM signal can pass through antenna, produce intermodulation signal with the WCDMA signal of the machine transmitting, if intermodulation signal has dropped in the reception frequency range of WCDMA, will directly have influence on the receiving sensitivity of WCDMA signal.Now describe as an example of the most frequently used WCDMABand1 frequency range example: Band1 tranmitting frequency is as 1.95GHz, receive frequency is 2.14GHz, and the tranmitting frequency of GSM1800 frequency range is 1.76GHz, therefore, the third order intermodulation signal that the transmitting power of the transmitting power of WCDMA Band1 and GSM1800 frequency range produces, its power-frequency is f
iMD=2f
tx1-f
tx2=21950-1760=2140, and 2140Hz is just in time the receive frequency of WCDMABand1, the intermodulation signal that therefore these two frequency band power produce can have influence on the sensitivity that WCDMA signal receives.
Summary of the invention
For the above-mentioned defect existing in prior art, technical problem to be solved by this invention is in multi-mode mobile communication, how effectively to suppress intermodulation component, thereby prevents the sensitivity that intermodulation signal impact receives.
For solving the problems of the technologies described above, the invention provides high linearity multi-mode radio frequency antenna switch circuit, comprising: antenna, multiple switching branches and multiple signal transmitting and receiving end; Wherein, each described signal transmitting and receiving end is coupled to described antenna by a described switching branches separately; The lamination cascaded structure that each described switching branches is several transistor devices; In each described switching branches, the first two transistor device of close described antenna is respectively parallel with grid with electric capacity.
Preferably, in the each described switching branches of described circuit, the lamination cascaded structure of described several transistor devices is specially: except the source/drain of the first transistor connects described antenna, last transistorized drain/source connects described signal transmitting and receiving end, last transistorized drain/source couples next transistorized source/drain, and each transistorized grid is also separately by extremely same gate voltage end of a load coupled.
Preferably, in the each described switching branches of described circuit, between the source/drain of the first transistor of close described antenna and grid, be parallel with the first grid with electric capacity; Between the drain/source of the inferior transistor seconds near described antenna and grid, be parallel with second gate with electric capacity.
Preferably, described transistor is NMOS pipe, PMOS pipe or the pipe of the FET based on PHEMT technique.
Preferably, described grid are 1pF left and right with the size of electric capacity.
Preferably, the control end of described multiple switching branches adopts that hilted broadsword is thrown more, multitool is thrown more or each branch road is independently controlled the mode of cut-offfing and connected.
Preferably, in described circuit, synchronization only has a described switching branches in conducting state, now described in all the other switching branches in off state.
Compared with prior art, a kind of high linearity multi-mode radio frequency antenna switch circuit provided by the present invention, suppress structure by design intermodulation in radio-frequency switch circuit, add grid with electric capacity, in the time that radiofrequency signal is passed through radio-frequency (RF) switch, grid can suppress second order intermodulation and third order intermodulation effectively with electric capacity, have obviously improved the linearity of radio-frequency antenna switch, have significantly improved the receiving sensitivity of whole system.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of multi-mode radio frequency duplexer in prior art;
Fig. 2 is high linearity multi-mode radio frequency antenna switch circuit structural representation in a preferred embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is for implementing preferred embodiments of the present invention, and described description is to illustrate that rule of the present invention is object, not in order to limit scope of the present invention.Protection scope of the present invention should with claim the person of being defined be as the criterion, based on the embodiment in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belongs to the scope of protection of the invention.
In the circuit design of the multi-mode radio frequency duplexer of prior art, the radio frequency interference between multimode signal is serious, and the second order intermodulation that especially multimode signal produces and third order intermodulation signal have had a strong impact on the receiving sensitivity of whole system.In order to solve this defect, the invention provides one and have high linearity multi-mode radio frequency antenna switch circuit, can effectively suppress intermodulation component by high linear switch, thereby prevent the sensitivity that intermodulation signal impact receives, and can meet the linear requirement of height of 3G communication.
A kind of high linearity multi-mode radio frequency antenna switch circuit disclosed by the invention, comprising: antenna, multiple switching branches and multiple signal transmitting and receiving end; Wherein, each signal transmitting and receiving end is coupled to described antenna by a switching branches separately; Each switching branches is the lamination cascaded structure of several transistor devices; In each switching branches, the first two transistor device of close described antenna is respectively parallel with grid with electric capacity.
With further reference to Fig. 2, in a preferred embodiment of the invention, be illustrated as an example of SP3T radio-frequency antenna switching circuit example.Particularly, in the preferred embodiment, radio-frequency antenna switching circuit comprises antenna 207, three radiofrequency signal sending and receiving end TRX1, TRX2 and TRX3 and antenna 207 is coupled to respectively to three switching branches of three signal transmitting and receiving ends.Each switching branches is the lamination cascaded structure of several transistor devices; Particularly, in each switching branches, except the source electrode of the first transistor connects antenna, last transistorized drain electrode connects signal transmitting and receiving end, last transistorized drain electrode couples next transistorized source electrode, each transistorized grid is also coupled to same gate voltage end by a load (being generally resistance) separately, controls cut-offfing of this branch road by this gate voltage end output conducting voltage.Wherein, according to the preferred embodiment, in each branch road, the first two transistor of close antenna is respectively parallel with grid with electric capacity; Particularly, the first branch road take first signal sending and receiving end TRX1 to antenna 207 is as example, between the source electrode of the first transistor 208 of close antenna and grid, be parallel with the first grid with electric capacity 201, between the drain and gate of the inferior transistor seconds 209 near antenna, be parallel with second gate with electric capacity 202; In all the other two branch roads, be provided with in pairs too grid separately with electric capacity 203,204 and 205,206.
Adopt aforesaid way, in the time of radio-frequency antenna switch (the first branch road conducting take first signal sending and receiving end TRX1 to antenna 207 is as example), in the time of this first branch road conducting, all the other two branch roads, in off state, are two isolation branch roads.In the time of first branch road of radiofrequency signal by conducting, the grid on the first branch road with electric capacity 201 and 202 acting in conjunction meetings suppress radio frequency main signals by time the Crosstalk of second order that produces; Meanwhile, on two other isolation branch road, the grid of close antenna can suppress with electric capacity 203 and 205 the third order intermodulation distortion that radiofrequency signals produce by the leakage of this isolation branch road.By the mode of the preferred embodiment of the present invention, in each branch road, add the radio-frequency switch circuit of grid with electric capacity, more than crosstalk inhibition degree can improve 10dB, greatly improve the receiving sensitivity of whole system.Preferably, grid are 1pF left and right with the value of electric capacity, and in side circuit domain, 1pF electric capacity area occupied, less than 1% of whole circuit, increases the area of actual chips hardly, therefore can not affect the cost of chip and circuit design and layout.
In the preferred embodiment of Fig. 2 only using SP3T circuit as exemplary illustration, in actual conditions, the number of signal transmitting and receiving end and switching branches is specifically arranged according to system requirements, such as the various modes of supporting corresponding to system, adopt N signal transmitting and receiving end and N switching branches and same antenna to couple (multimode a single aerial system); Or n
iindividual signal transmitting and receiving end and n
iindividual switching branches and n
iindividual antenna couples (multimode multiaerial system).In addition, adopt that hilted broadsword is thrown more, multitool is thrown more or each branch road independently to control the mode of cut-offfing are all also possibilities; The transistor stack series connection number adopting in each branch road also can be set according to the concrete condition of circuit, and for example in specific implementation, harmonic power control ability and the linear index of specifically throwing insulated degree requirement, every branch road between number, each branch road according to radio-frequency antenna switch adjusted.Therefore,, in actual implementation process of the present invention, number, specification and the coupling mode of said modules all do not done concrete restriction.
Further, in preferred embodiment shown in Fig. 2, each transistor all adopts NMOS pipe, but relevant technical staff in the field is appreciated that, adopt PMOS pipe except conducting voltage is distinct, actual occupation mode and effect all with NMOS pipe without essential distinction, thereby obviously in other execution modes of the present invention, also can adopt PMOS pipe; Or in part branch road, adopt NMOS pipe, in other branch roads, adopt the modes such as PMOS pipe; Similarly, the pipe of the FET based on PHEMT technique also can adopt similar mode to be applied in circuit of the present invention.But preferably,, for ease of pcb board processing and circuit design, in circuit, preferably adopt unified transistor.In addition, because the source-drain electrode practical structures of metal-oxide-semiconductor is identical, thereby in the above-mentioned description about source transistor drain electrode in Fig. 2, the annexation of source electrode and drain electrode is interchangeable, and above preferred embodiment should not be construed as the restriction to technical solution of the present invention.
Technical scheme proposed by the invention, can be applied to the handheld terminal of various wireless communication standard, as GSM network signal, WCDMA network signal, cdma network signal, TD-SCDMA network signal, UMTS network signal and LTE network signal etc., wherein GSM network signal comprises the GSM_TX network signal of low-frequency range and the DCS_TX network signal of high band; UMTS network signal and LTE network signal share same transmit/receiving port.The GSM_TX network signal transmitting/receiving port corresponding with DCS_TX network signal can also be provided with low pass filter.
Compared with prior art, a kind of high linearity multi-mode radio frequency antenna switch circuit provided by the present invention, suppress structure by design intermodulation in radio-frequency switch circuit, add grid with electric capacity, in the time that radiofrequency signal is passed through radio-frequency (RF) switch, grid can suppress second order intermodulation and third order intermodulation effectively with electric capacity, have obviously improved the linearity of radio-frequency antenna switch, have significantly improved the receiving sensitivity of whole system.
Above-mentioned explanation illustrates and has described some preferred embodiments of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, modification and environment, and can, in invention contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not depart from the spirit and scope of the present invention, all should be in the protection range of claims of the present invention.
Claims (7)
1. a high linearity multi-mode radio frequency antenna switch circuit, is characterized in that, described circuit comprises: antenna, multiple switching branches and multiple signal transmitting and receiving end; Wherein,
Each described signal transmitting and receiving end is coupled to described antenna by a described switching branches separately;
The lamination cascaded structure that each described switching branches is several transistor devices;
In each described switching branches, the first two transistor device of close described antenna is respectively parallel with grid with electric capacity.
2. circuit as claimed in claim 1, is characterized in that, in the each described switching branches of described circuit, the lamination cascaded structure of described several transistor devices is specially:
Except the source/drain of the first transistor connects described antenna, last transistorized drain/source connects described signal transmitting and receiving end, last transistorized drain/source couples next transistorized source/drain, and each transistorized grid is also separately by extremely same gate voltage end of a load coupled.
3. the circuit described in claim 1 or 2, is characterized in that, in the each described switching branches of described circuit, is parallel with the first grid with electric capacity between the source/drain of the first transistor of close described antenna and grid; Between the drain/source of the inferior transistor seconds near described antenna and grid, be parallel with second gate with electric capacity.
4. circuit as claimed in claim 1, is characterized in that, described transistor is NMOS pipe, PMOS pipe or the pipe of the FET based on PHEMT technique.
5. circuit as claimed in claim 1, is characterized in that, described grid are 1pF left and right with the size of electric capacity.
6. circuit as claimed in claim 1, is characterized in that, the control end of described multiple switching branches adopts that hilted broadsword is thrown more, multitool is thrown more or each branch road is independently controlled the mode of cut-offfing and connected.
7. the circuit as described in claim 1 or 6, is characterized in that, in described circuit, synchronization only has a described switching branches in conducting state, now described in all the other switching branches in off state.
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| CN201410085417.2A CN103795432A (en) | 2014-03-10 | 2014-03-10 | High-linearity multimode radio frequency antenna switch circuit |
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| CN201410085417.2A CN103795432A (en) | 2014-03-10 | 2014-03-10 | High-linearity multimode radio frequency antenna switch circuit |
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Cited By (11)
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| CN104393861A (en) * | 2014-11-27 | 2015-03-04 | 大连尚能科技发展有限公司 | Parallel circuit of MOSFET |
| CN104868894A (en) * | 2015-03-23 | 2015-08-26 | 上海新微技术研发中心有限公司 | Radio frequency switch circuit and opening and closing method thereof |
| CN106230419A (en) * | 2016-07-27 | 2016-12-14 | 上海华虹宏力半导体制造有限公司 | SOI RF switch structure and integrated circuit |
| CN106230417A (en) * | 2016-07-27 | 2016-12-14 | 上海华虹宏力半导体制造有限公司 | SOI RF switch structure and integrated circuit |
| CN106539569A (en) * | 2015-12-10 | 2017-03-29 | 悦享趋势科技（北京）有限责任公司 | Wearable physiological monitoring equipment and its antenna system |
| CN106911326A (en) * | 2015-12-18 | 2017-06-30 | 上海新微技术研发中心有限公司 | Radio frequency switch capable of reducing bias control signal |
| CN108039585A (en) * | 2017-12-19 | 2018-05-15 | 无锡中普微电子有限公司 | A kind of antenna tuning circuit |
| CN109088626A (en) * | 2018-07-21 | 2018-12-25 | 安徽矽磊电子科技有限公司 | A kind of RF switch of super low-power consumption biasing |
| CN111130519A (en) * | 2020-01-03 | 2020-05-08 | 广州慧智微电子有限公司 | Switch circuit, control method, device, radio frequency switch and readable storage medium |
| CN112235013A (en) * | 2020-09-30 | 2021-01-15 | 锐石创芯（深圳）科技有限公司 | Radio frequency switch circuit, radio frequency front end circuit and wireless device |
| CN113131911A (en) * | 2019-12-31 | 2021-07-16 | 上海麓慧科技有限公司 | Radio frequency switch circuit, radio frequency switch chip and wireless communication equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104393861B (en) * | 2014-11-27 | 2017-12-19 | 大连尚能科技发展有限公司 | A kind of MOSFET parallel circuit |
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| CN104868894A (en) * | 2015-03-23 | 2015-08-26 | 上海新微技术研发中心有限公司 | Radio frequency switch circuit and opening and closing method thereof |
| CN106539569A (en) * | 2015-12-10 | 2017-03-29 | 悦享趋势科技（北京）有限责任公司 | Wearable physiological monitoring equipment and its antenna system |
| CN106911326A (en) * | 2015-12-18 | 2017-06-30 | 上海新微技术研发中心有限公司 | Radio frequency switch capable of reducing bias control signal |
| CN106230417A (en) * | 2016-07-27 | 2016-12-14 | 上海华虹宏力半导体制造有限公司 | SOI RF switch structure and integrated circuit |
| CN106230419A (en) * | 2016-07-27 | 2016-12-14 | 上海华虹宏力半导体制造有限公司 | SOI RF switch structure and integrated circuit |
| CN106230419B (en) * | 2016-07-27 | 2019-04-19 | 上海华虹宏力半导体制造有限公司 | SOI RF switch structure and integrated circuit |
| CN108039585A (en) * | 2017-12-19 | 2018-05-15 | 无锡中普微电子有限公司 | A kind of antenna tuning circuit |
| CN109088626A (en) * | 2018-07-21 | 2018-12-25 | 安徽矽磊电子科技有限公司 | A kind of RF switch of super low-power consumption biasing |
| CN109088626B (en) * | 2018-07-21 | 2022-05-24 | 安徽矽磊电子科技有限公司 | Ultralow-power-consumption biased radio frequency switch |
| CN113131911A (en) * | 2019-12-31 | 2021-07-16 | 上海麓慧科技有限公司 | Radio frequency switch circuit, radio frequency switch chip and wireless communication equipment |
| CN111130519A (en) * | 2020-01-03 | 2020-05-08 | 广州慧智微电子有限公司 | Switch circuit, control method, device, radio frequency switch and readable storage medium |
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