CN103187987A - Wireless transmit-receive mode conversion device based on time division duplex and wireless communication system - Google Patents
Wireless transmit-receive mode conversion device based on time division duplex and wireless communication system Download PDFInfo
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Abstract
The invention discloses a wireless transmit-receive mode conversion device based on time division duplex and a wireless communication system. A transmit-receive control unit gates a receiving channel or a transmitting channel; during realization, a switch is not required to be arranged on a master signal path, but mode conversion switches are arranged in amplifiers in the receiving channel and the transmitting channel; and the transmit-receive control unit controls the mode conversion switches to realize mode conversion. According to the device and the system, an SPDT (Single-Pole Double-Throw) switch used in the prior art is removed from a circuit design, and the cost and power consumption of a chip are reduced. Furthermore, the adverse effects of the SPDT switch on the performances of the chip can be reduced. The device and the system are applicable to the design of a transmit-receive mode conversion circuit of the CMOS (Complementary Metal-Oxide-Semiconductor Transistor) fully integrated TDD (Time Division Duplex) wireless communication chip.
Description
Technical field
The present invention relates to the integrated circuit (IC) design field, be specifically related to the integrated circuit (IC) design technology that the transmitting-receiving of TDD radio communication is switched.
Background technology
In in the past 10 years, wireless communication industry has experienced explosive growth, has accelerated the development of integrated circuit (IC) industry.Particularly in IC design industry, increasing wireless communication chips all is integrated in the CMOS technology, along with market competition is violent day by day, cost and power consumption considerations become the overriding concern point of chip design, particularly for the wireless consumer communication chip of time division duplex (TDD) of early stage maturation.
Typically, in the TDD wireless communication system, single-pole double throw (SPDT) switch switches between radio frequency (RF) emission (Tx) signal and RF reception (Rx) signal, and it is in emission mode and receiving mode by time division system.
As shown in Figure 1, for adopting the RFIC circuit theory diagrams of SPDT switch in the existing TDD communication system.When emission mode, single-pole double throw (SPDT) switch 103 switches to antenna with the Tx signal from transmitter 101, and when receiving mode, the Rx signal is switched to receiver 102 from antenna.This RF switch 103 is finished switching according to the TDD control signal between Tx path and Rx path.This structure is applicable in the system that has less than the 1W transmitting power and uses.
The SPDT radio-frequency (RF) switch that Fig. 2 realizes for CMOS technology.SPDT switch 202,203 adopts buoyancy aid switching circuit (being that substrate connects big resistance), improve the linearity and reduce power attenuation, Rx path low noise amplifier (LNA) 212 adopts independently matching network with Tx path power amplifier (PA) 213, i.e. input matching network 210 and output matching network 211.When the Rx closed-circuit working, 202 conductings of SPDT switch, antenna end 201 links to each other with LNA212, disconnects with PA213; When the Tx closed-circuit working, 203 conductings of SPDT switch, antenna end 201 links to each other with PA213, disconnects with LNA212.But because SPDT switch 202,203 is on the RF signal path, its MOS channel resistance can influence the Q value of matching network and bring certain signal attenuation, thereby increase the noise factor (NF) of Rx LNA, reduce the power output of Tx PA, this all can increase the power consumption of chip.This is for consumer electronics product, and as TDD System on Chip/SoCs such as bluetooth (BT), Ziggbee, transmitting-receiving scheme shown in Figure 2 does not have the performance competitive advantage.
Summary of the invention
The technical problem that the present invention solves is to propose a kind of wireless transceiving modes switching device shifter and wireless communication system based on time division duplex, realizes transceiver mode switching low-cost, low-power consumption.
A kind of wireless transceiving modes switching device shifter based on time division duplex that the present invention proposes, comprise: antenna element, the reception path that is constituted by input matching network unit and low noise amplifier, and the emission path that is constituted by output matching network unit and power amplifier; Also comprise the transmitting-receiving control unit; Described emission path and reception path all are connected to described antenna element by corresponding matching network unit; Described transmitting-receiving control unit is used for receiving path or emission path according to the pattern switching command gating of receiving.
Further, described low noise amplifier is provided with the receiving mode the diverter switch whether described low noise amplifier of control works, and described power amplifier is provided with the emission mode the diverter switch whether described power amplifier of control works; Described transmitting-receiving control unit is used for controlling described receiving mode diverter switch or the action of emission mode diverter switch according to the pattern switching command of receiving, with the closed-circuit working of gating correspondence.
Further, described input matching network unit comprises that also control receives the input impedance diverter switch that path input impedance value is switched between high impedance and characteristic impedance, and described output matching network unit also comprises the output impedance diverter switch that control emission path output impedance value is switched between high impedance and characteristic impedance; Described transmitting-receiving control unit also is used for controlling according to the pattern switching command of receiving the action of described impedance diverter switch, the resistance value of controlling described input matching network unit when gating receives path is characteristic impedance, the resistance value of described output matching network unit is high impedance, the resistance value of controlling described input matching network unit when gating emission path is high impedance, and the resistance value of described output matching network unit is characteristic impedance.
Further, described input impedance diverter switch and output impedance diverter switch are interlock switch.
Further, described input matching network unit is ∏ type, L type or T type matching network unit; Described output matching network unit is ∏ type, L type or T type matching network unit.
Further, described receiving mode diverter switch and emission mode diverter switch are the MOS switching circuit.
Further, described input impedance diverter switch and output impedance diverter switch are the MOS switching circuit.
Further, described input impedance diverter switch and output impedance diverter switch are buoyancy aid MOS switching circuit.
Further, described low noise amplifier is inductive source degeneration common-source amplifier.
Further, described power amplifier is the cascade high-frequency amplifier.
The invention also discloses a kind of wireless communication system based on time division duplex, comprise transmitter and receiver, it is characterized in that, also comprise above-mentioned wireless transceiving modes switching device shifter, described transmitter links to each other with the power amplifier of described wireless transceiving modes switching device shifter, and described receiver links to each other with the low noise amplifier of described wireless transceiving modes switching device shifter.
The present invention adopts and in main signal switch is not set, and in the amplifier in reception and transmission path mode selector switch is set, and switches by transmitting-receiving control unit control model diverter switch implementation pattern.The present invention has reduced cost and the power consumption of chip owing to saved the SPDT switch that uses in the prior art in circuit design.And can also reduce the harmful effect that chip performance is brought because of use SPDT switch.The present invention is applicable to the design of the fully integrated TDD wireless communication chips of CMOS transceiver mode commutation circuit.
Description of drawings
Fig. 1 is the schematic diagram that prior art SPDT switching circuit transceiver mode is switched;
Fig. 2 is the circuit diagram of the SPDT radio-frequency (RF) switch of available technology adopting CMOS technology realization;
Fig. 3 is the wireless transceiving modes switching device shifter schematic diagram based on time division duplex of the embodiment of the invention one;
Fig. 4 is the wireless transceiving modes switching device shifter circuit diagram of the embodiment of the invention two;
Fig. 5 is buoyancy aid impedance switching switch circuit schematic diagram in the embodiment of the invention two.
Embodiment
Below in conjunction with accompanying drawing, and by specific embodiment realization of the present invention is elaborated.
Embodiment one
Wireless transceiving modes switching device shifter as shown in Figure 3, comprise: antenna element 301, by input matching network unit 302 and the reception path Rx that constitutes of low noise amplifier LNA305 of series connection, and the emission path Tx that is constituted by output matching network unit 303 and power amplifier PA306, and transmitting-receiving control unit 304.Transmitting-receiving control unit 304 can receive path Rx or emission path Tx according to the pattern switching command gating of receiving.In the present embodiment, in low noise amplifier 305, be provided with the receiving mode diverter switch, control low noise amplifier 305 in running order or off positions.Power amplifier 306 is provided with the emission mode diverter switch, control power amplifier 306 in running order or off positions.Transmitting-receiving control unit 304 is used for according to the pattern switching command control receiving mode diverter switch of receiving or the action of emission mode diverter switch, receives path Rx or emission path Tx work with gating.
In one embodiment, influence chip performance in order to solve the MOS switch at signal path, need make suitable modification to input matching network unit 302 and output matching network unit 303, the control that makes the two also receive and dispatch control unit 304 is namely controlled the resistance value Zin of input matching network unit 302 and the resistance value Zout of output matching network unit 303 and is switched between characteristic impedance 50ohm and high resistant.Say that in detail when being exactly the Rx mode of operation, input matching network unit 302 and output matching network unit 303 are received and dispatched the control of control unit 304 and disposed, make Zin=50ohm, Zout=∞, this moment the LNA305 operate as normal, PA306 turn-offs, the RF signal of LNA305 reception antenna unit 301; During the Tx mode of operation, input matching network unit 302 and output matching network unit 303 are received and dispatched the control of control unit 304 and are disposed, and make Zin=∞, Zout=50ohm, this moment PA 306 operate as normal, LNA305 turn-offs, PA306 output RF signal is to antenna element 301.In one implementation, can adopt the input impedance diverter switch is set in input matching network unit 302, the output impedance diverter switch is set in output matching network unit 303.304 actions according to the pattern switching command control group diverter switch of receiving of transmitting-receiving control unit, the resistance value of control input matching network unit 302 is characteristic impedance when gating receives path, the resistance value of output matching network unit 303 is high impedance, the resistance value of control input matching network unit 302 is high impedance when gating emission path, and the resistance value of output matching network unit 303 is characteristic impedance.This implementation influences less owing to just the impedance diverter switch is integrated in the matching network unit to chip performance.Further, in one embodiment, input impedance diverter switch and output impedance diverter switch can also be designed to interlock switch, a unlatching, another is then closed.
Above-mentioned input matching network unit can be ∏ type, L type or T type matching network unit; The output matching network unit also can be ∏ type, L type or T type matching network unit.
Above-mentioned receiving mode diverter switch and emission mode diverter switch, and input impedance diverter switch and output impedance diverter switch can be MOS switching circuit, how other forms of switching circuit.Wherein in order to reduce the influence of the parasitic diode in the MOS switching tube, can adopt buoyancy aid MOS switching circuit to realize input impedance diverter switch and output impedance diverter switch.
Embodiment two
By a concrete circuit structure realization of the present invention is described again below.In the wireless transceiving modes switching device shifter circuit as shown in Figure 4, comprise following part: antenna 401, input matching network 402, output matching network 403, TDD control signal generator 404, LNA405 and PA406.
Among the figure, input matching network 402, output matching network 403 adopt ∏ type matching network.LNA405 is inductive source degeneration common-source amplifier.PA406 is the cascade high-frequency amplifier.In matching network, be provided with input impedance diverter switch 409 and output impedance diverter switch 407.Be respectively equipped with receiving mode diverter switch 410 and emission mode diverter switch 408 at LNA405 and PA406.
The course of work of this circuit under the Rx mode of operation is: TDD control signal generator 404 produces corresponding Rx working control signal: TxRxSW=0, S1=1, S2=0, make LNA405 in running order, PA406 is in closed condition, output impedance diverter switch 407 is closed, input impedance diverter switch 409 disconnects, this moment, output matching network 402 resonance produced high resistant, Zout=∞, input matching network 403 is matched to characteristic impedance with the LNA405 equivalent input impedance, i.e. Zin=50ohm, output matching network 403 can not influence input matching network 402, and the RF signal that antenna 401 receives is amplified by LNA405.
The course of work of this circuit under the Tx mode of operation is: TDD control signal generator 404 produces corresponding Tx working control signal: TxRxSW=1, S1=0, S2=1, make LNA405 be in closed condition, PA406 is in running order, the output impedance switching is opened 407 and is disconnected, input impedance diverter switch 409 is closed, this moment, input matching network 402 resonance produced high resistant, Zin=∞, output matching network is matched to characteristic impedance with the PA406 equivalent input impedance, i.e. Zout=50ohm, input matching network 402 can not influence output matching network 403, and the RF signal that PA406 amplifies is transferred to antenna 401 and launches.
In the present embodiment, input impedance diverter switch 409 and output impedance diverter switch 407, and receiving mode diverter switch 410 and emission mode diverter switch 408 can adopt simple MOS switching circuit.
Wherein input impedance diverter switch 409 and output impedance diverter switch 407 can adopt buoyancy aid MOS switching circuit.I.e. MOS switch connected mode as shown in Figure 5, the grid of MOS switch 501, substrate are connected on the corresponding current potential by big resistance 502,503, and this connected mode can reduce the influence of the parasitic diode of each inter-stage.
In addition the power amplifier of transmitter with wireless transceiving modes switching device shifter of the present invention linked to each other, receiver links to each other with the low noise amplifier of wireless transceiving modes switching device shifter of the present invention, just constitute a kind of wireless communication system based on time division duplex, this system has the corresponding characteristics of wireless transceiving modes switching device shifter of the present invention equally, just repeats no more at this.
The above embodiment; it only is preferred embodiments of the present invention; be not for limiting protection scope of the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace or improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. wireless transceiving modes switching device shifter based on time division duplex, comprise: antenna element, the reception path that is constituted by input matching network unit and low noise amplifier, and the emission path that is constituted by output matching network unit and power amplifier, it is characterized in that, also comprise the transmitting-receiving control unit; Described emission path and reception path all are connected to described antenna element by corresponding matching network unit; Described transmitting-receiving control unit is used for receiving path or emission path according to the pattern switching command gating of receiving.
2. the wireless transceiving modes switching device shifter based on time division duplex according to claim 1, it is characterized in that, described low noise amplifier is provided with the receiving mode the diverter switch whether described low noise amplifier of control works, and described power amplifier is provided with the emission mode the diverter switch whether described power amplifier of control works; Described transmitting-receiving control unit is used for controlling described receiving mode diverter switch or the action of emission mode diverter switch according to the pattern switching command of receiving, with the closed-circuit working of gating correspondence.
3. wireless transceiving modes switching device shifter according to claim 1 and 2, it is characterized in that, described input matching network unit comprises that also control receives the input impedance diverter switch that path input impedance value is switched between high impedance and characteristic impedance, and described output matching network unit also comprises the output impedance diverter switch that control emission path output impedance value is switched between high impedance and characteristic impedance; Described transmitting-receiving control unit also is used for controlling according to the pattern switching command of receiving the action of described impedance diverter switch, the resistance value of controlling described input matching network unit when gating receives path is characteristic impedance, the resistance value of described output matching network unit is high impedance, the resistance value of controlling described input matching network unit when gating emission path is high impedance, and the resistance value of described output matching network unit is characteristic impedance.
4. wireless transceiving modes switching device shifter according to claim 3 is characterized in that, described input impedance diverter switch and output impedance diverter switch are interlock switch.
5. wireless transceiving modes switching device shifter according to claim 1 and 2 is characterized in that, described input matching network unit is ∏ type, L type or T type matching network unit; Described output matching network unit is ∏ type, L type or T type matching network unit.
6. wireless transceiving modes switching device shifter according to claim 2 is characterized in that, described receiving mode diverter switch and emission mode diverter switch are the MOS switching circuit.
7. wireless transceiving modes switching device shifter according to claim 3 is characterized in that, described input impedance diverter switch and output impedance diverter switch are the MOS switching circuit.
8. wireless transceiving modes switching device shifter according to claim 7 is characterized in that, described input impedance diverter switch and output impedance diverter switch are buoyancy aid MOS switching circuit.
9. wireless transceiving modes switching device shifter according to claim 1 and 2 is characterized in that, described low noise amplifier is inductive source degeneration common-source amplifier; Described power amplifier is the cascade high-frequency amplifier.
10. wireless communication system based on time division duplex, comprise transmitter and receiver, it is characterized in that, also comprise each described wireless transceiving modes switching device shifter as claim 1-9, described transmitter links to each other with the power amplifier of described wireless transceiving modes switching device shifter, and described receiver links to each other with the low noise amplifier of described wireless transceiving modes switching device shifter.
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Cited By (8)
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| CN105023418A (en) * | 2015-07-28 | 2015-11-04 | 桂林市利通电子科技有限责任公司 | Performance improving circuit for communication chip |
| CN106464289A (en) * | 2015-11-04 | 2017-02-22 | 深圳博芯科技股份有限公司 | 5.8G long distance wireless data transmission system |
| CN107367702A (en) * | 2016-05-13 | 2017-11-21 | 上海联影医疗科技有限公司 | The matching process and gridding radio-frequency coil of a kind of multiport coil |
| CN108988894A (en) * | 2017-06-02 | 2018-12-11 | 聚睿电子股份有限公司 | Composite radio frequency transceiver circuit |
| CN110474657A (en) * | 2019-09-25 | 2019-11-19 | 大唐半导体科技有限公司 | A kind of high frequency transmit-receive switch integrated circuit and its method |
| CN113228521A (en) * | 2018-12-28 | 2021-08-06 | 华为技术有限公司 | Transmit-receive separation circuit, transceiver and wireless communication equipment |
| CN115102566A (en) * | 2022-06-15 | 2022-09-23 | 南京英锐创电子科技有限公司 | Wireless communication system and signal transceiver thereof |
| WO2022224096A1 (en) * | 2021-04-23 | 2022-10-27 | International Business Machines Corporation | Embedded transmit/receive switch |
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Application publication date: 20130703 |