CN1258933C - Time division duplex receiving sending switch device - Google Patents
Time division duplex receiving sending switch device Download PDFInfo
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- CN1258933C CN1258933C CNB2003101016672A CN200310101667A CN1258933C CN 1258933 C CN1258933 C CN 1258933C CN B2003101016672 A CNB2003101016672 A CN B2003101016672A CN 200310101667 A CN200310101667 A CN 200310101667A CN 1258933 C CN1258933 C CN 1258933C
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Abstract
The present invention discloses a time-division duplex receiving and transmitting switch device which comprises a circulator, 3dB electric bridges 1 and 2, SPST electronic switches 1 to 4, 50 ohm loads 1 to 4 and a controlling and driving unit, wherein the controlling and driving unit is used for controlling and driving the switching-on and the switching-off of the SPST electronic switches 1 to 4 according to control signals. The INPUT end of the circulator is connected with the ISOLATED end of the 3dB electric bridge 1, and the ISOLATED end is connected with the INPUT end of the 3dB electric bridge 2; the OUTPUT end of the circulator is externally connected with an antenna. The INPUT end of the 3dB electric bridge 1 is connected with a transmitting end signal TX; the I end of the 3dB electric bridge 1 is grounded after being connected in series with the SPST electronic switch 1 and the 50 ohm load 1, and the Q end is grounded after being connected in series with the SPST electronic switch 2 and the 50 ohm load 2. The ISOLATED end of the 3dB electric bridge 2 is connected with a receiving end signal RX; the Q end of the 3dB electric bridge 2 is grounded after being connected in series with the SPST electronic switch 3 and the 50 ohm load 3, and the I end is grounded after being connected in series with the SPST electronic switch 4 and the 50 ohm load 4. When a system is in a transmitting state, the controlling and driving unit controls the switching-off of the SPST electronic switches 1 and 2 and the switching-on of the SPST electronic switches 3 and 4. When the system is in a receiving state, the controlling and driving unit controls the switching-on of the SPST electronic switches 1 and 2 and the switching-off of the SPST electronic switches 3 and 4. The device proposed by the present invention has the advantages of high isolation degree, high power tolerance and simple realization.
Description
Technical field
The present invention relates to a kind of switching device, in particular to a kind of transmit-receive switch device of time division duplex.
Technical background
In field of mobile communication, wireless device generally adopts duplex mode to realize the transmit-receive sharing of antenna, and duplex mode has the branch of Frequency Division Duplexing (FDD) (FDD) and time division duplex (TDD).For time division duplex, generally adopt radio-frequency (RF) switch to realize transmission duplex.The frequency microwave transmit-receive switch that generally uses generally is to use PIN diode as main devices at present, controls the PIN diode conducting of different paths and turn-offs the transmission-receiving function of realizing switch by bias voltage.United States Patent (USP) 20030119455 (Transmitting/ReceivingSwitch and Portable Terminal Unit) is more typically arranged, the described transmit-receive switch of this patent, promptly be to use emission path series diode, receive the path parallel diode to ground, by the break-make of two diodes of a switch controlling signal control, realize transmitting-receiving path handoff functionality.Though this method principle is comparatively simple,, be not easy to realize impedance matching, and consistency of performance is relatively poor because the impedance operator of PIN diode when transmitting power is bigger, implements more complicated.
Along with the raising of transmitting power, the requirement of the power margin of transmit-receive switch is also correspondingly improved.It is the following occasion of 10W that the especially integrated IC switch of electronic switch generally is applied in power, and in the application scenario greater than 10W, the realization of electronic switch just has technical difficulty, improves the rapid rising that its power margin can cause cost from electronic switch itself merely.When power demand surpassed electronic switch power margin in the cards, its circuit implementation will become a more formidable problem, and having had not yet to see what technology can address this problem well.
Summary of the invention
Purpose of the present invention is exactly above-mentioned under high-power requirement in order to overcome, and the problem that is difficult to realize by the PIN diode electronic switch time division duplex transmitting-receiving proposes a kind of time division duplex transmit-receive switch device with high isolation degree and power margin.
A kind of time division duplex transmit-receive switch device is characterized in that comprising circulator 103,3dB electric bridge 1,3dB electric bridge 2, SPST electronic switch 1-4,50 ohm load 1-4 and control drive unit 113; Described control drive unit 113 is used for the turn-on and turn-off according to control signal controlling and driving SPST electronic switch 1-4; The ISOLATED end of the INPUT termination 3dB electric bridge 1 of described circulator 103, the INPUT end of the ISOLATED termination 3dB electric bridge 2 of circulator 103, the OUTPUT end external antenna of described circulator 103; The INPUT termination transmitting terminal signal TX of described 3dB electric bridge 1, I end serial connection SPST electronic switch 150 ohm load 1 back ground connection, Q end serial connection SPST electronic switch 2 and 50 ohm load, 2 back ground connection; The ISOLATED termination receiving end signal RX of described 3dB electric bridge 2, Q end serial connection SPST electronic switch 3 and 50 ohm load, 3 back ground connection, I end serial connection SPST electronic switch 4 and 50 ohm load, 4 back ground connection; When system was in emission state, described control drive unit 113 was turn-offed SPST electronic switch 3 and 4 conductings according to state control signal control SPST electronic switch 1 and 2; When system was in accepting state, described control drive unit 113 was according to state control signal control SPST electronic switch 1 and 2 conductings, and SPST electronic switch 3 and 4 turn-offs.
The device that the present invention proposes is realized the transmit-receive switch device by isolation and the power characteristic of using 3dB electric bridge and circulator, thereby the device that makes the present invention propose has very high isolation and higher power margin, and it realizes simple.
Description of drawings
Fig. 1 is the principle schematic of the time division duplex transmit-receive switch device that proposes of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the principle schematic of the time division duplex transmit-receive switch device that proposes of the present invention.As shown in Figure 1, the device of inventor's proposition comprises circulator 103,3dB electric bridge 1,3dB electric bridge 2, SPST electronic switch 1-4,50 ohm load 1-4 and control drive unit 113; Described control drive unit 113 is used for unlatching and the shutoff according to control signal controlling and driving SPST electronic switch 1-4; The ISOLATED end of the INPUT termination 3dB electric bridge 1 (101) of described circulator 103, the INPUT end of the ISOLATED termination 3dB electric bridge 2 (102) of circulator 103, the OUTPUT end external antenna of described circulator 103; The INPUT termination transmitting terminal signal TX of described 3dB electric bridge 1 (101), I end serial connection SPST electronic switch 1 (104) 50 ohm load 1 (108) back ground connection, Q end serial connection SPST electronic switch 2 (105) and 50 ohm load, 2 (109) back ground connection; The ISOLATED termination receiving end signal RX of described 3dB electric bridge 2 (102), Q end serial connection SPST electronic switch 3 (106) and 50 ohm load, 3 (110) back ground connection, I end serial connection SPST electronic switch 4 (107) and 50 ohm load, 4 (111) back ground connection.In the present invention, 3dB electric bridge 1 (101), SPST electronic switch 1 (104), SPST electronic switch 2 (105) work to connect and disconnect transmission channel; 3dB electric bridge 2 (102), SPST electronic switch 3 (106), SPST electronic switch 4 (107) work to connect and disconnect receive path; Power when 50 ohm load, 1 (108), 50 ohm load 2 (109) absorb the transmission channel shutoff, the power when 50 ohm load, 3 (110), 50 ohm load 4 (111) absorb the receive paths shutoff is to reach the isolation purpose; 103 pairs of transmitting chains of circulator provide reverse isolation, can improve the isolation of reiving/transmitting state when external coupling antenna; TX represents to transmit among Fig. 1, and RX represents received signal.
In conjunction with Fig. 1, when system is in emission state, make SPST electronic switch 1 (104) by control drive unit 113, SPST electronic switch 2 (105) turn-offs, and the input signal of transmitting terminal enters in the 3dB electric bridge 1 (101) like this, 3dB electric bridge 1 (101) becomes the I end with the power-sharing of input, Q holds output, and two-way power equates, phase phasic difference 90 degree.Enter SPST electronic switch 1 (104) from the power of I end output, because SPST electronic switch 1 (104) disconnects, the I end of 3dB electric bridge 1 (101) is returned in the signal total reflection, input 3dB electric bridge 1 (101), power five equilibrium again exports the INPUT end and the ISOLTATED end of 3dB electric bridge 1 (101) to, and phase phasic difference 90 is spent.Enter SPST electronic switch 2 (105) from the power of Q end output, because SPST electronic switch 2 (105) disconnects, the Q end of 3dB electric bridge 1 (101) is returned in the signal total reflection, input 3dB electric bridge 1 (101), power five equilibrium again exports the INPUT end and the ISOLTATED end of 3dB electric bridge 1 (101) to, and phase phasic difference 90 is spent.The signal of reflection is offset after the mutual superposition at the INPUT of 3dB electric bridge 1 (101) end, and at the ISOLATED end, after the mutual superposition, final all power exports circulator to, thereby connects transmission channel.
When system is in emission state, make SPST electronic switch 3 (106) by control drive unit 113,4 (107) conductings of SPST electronic switch, the signal of antenna port reflects or input like this, behind circulator 103, enter 3dB electric bridge 2 (102), wherein a half-power is absorbed by 50 ohm load 3 (110) behind SPST electronic switch 3 (106), an other half-power is absorbed by 50 ohm load 4 (111) through SPST electronic switch 4 (107), it is almost nil that consequently 3dB electric bridge 2 (102) outputs to the signal of receiving terminal, thereby the cut-out receive path makes this port of circulator 103 effectively be mated simultaneously.
When system is in accepting state, make SPST electronic switch 3 (106) by control drive unit 113, SPST electronic switch 4 (107) turn-offs, the input signal of antenna port enters the INPUT end of 3dB electric bridge 2 (102) through circulator 103 like this, 3dB electric bridge 2 (102) becomes the I end with the power-sharing of input, Q holds output, and two-way power equates, phase phasic difference 90 degree.Enter SPST electronic switch 4 (107) from the power of I end output, because SPST electronic switch 4 (107) disconnects, the I end of 3dB electric bridge 2 (102) is returned in the signal total reflection, input 3dB electric bridge 2 (102), power five equilibrium again exports the INPUT end and the ISOLTATED end of 3dB electric bridge 2 (102) to, and phase phasic difference 90 is spent.Enter SPST electronic switch 3 (106) from the power of Q end output, because SPST electronic switch 3 (106) disconnects, the Q end of 3dB electric bridge 2 (102) is returned in the signal total reflection, input 3dB electric bridge 2 (102), power five equilibrium again exports the INPUT end and the ISOLTATED end of 3dB electric bridge 2 (102) to, and phase phasic difference 90 is spent.The signal of reflection is offset after the mutual superposition at the INPUT of 3dB electric bridge 2 (102) end, and at the ISOLATED end, after the mutual superposition, final all power exports receiving terminal to, thereby connects receive path.
When system is in accepting state, make SPST electronic switch 1 (103) by control drive unit 113,2 (104) conductings of SPST electronic switch, after the transmitting terminal input signal enters 3dB electric bridge 1 (101) like this, wherein a half-power is absorbed by 50 ohm load 1 (108) behind SPST electronic switch 1 (103), an other half-power is absorbed by 50 ohm load 2 (109) through SPST electronic switch 2 (104), it is almost nil that consequently 3dB electric bridge 1 (101) outputs to the signal of circulator 103, thereby the cut-out transmission channel makes this port of circulator 103 effectively be mated simultaneously.In sum, the switching logic state table that will finish of control drive unit 113 is as follows:
| System mode | SPST1(104) | SPST2(105) | SPST3(106) | SPST4(107) |
| Emission state | Turn-off | Turn-off | Conducting | Conducting |
| Accepting state | Conducting | Conducting | Turn-off | Turn-off |
In order to drive and control spst switch, control drive unit 113 specifically comprises logical operation part, level shifter interface part and the driving amplifier section of polyphone successively.Receive the control signal of system when control drive unit 113 after,, after the level conversion, be amplified to the turn-on and turn-off of removing difference controlling and driving SPST electronic switch after the actuating force of spst switch requirement through logical operation.
In an embodiment of the present invention, in order to reach best technique effect, 3dB electric bridge, spst switch, should be chosen in the working frequency range of system with circulator, SPST electronic switch 1-4 (104-107) preferably selects the switch of same model, and the consistency of spst switch performance is high more good more.After spst switch chooses, can handle its peripheral drive circuit, then it be connected as the connection diagram of a unit by Fig. 1 by the DEMO drawing that producer provides.In addition, the isolation of the switch of SPST should be greater than 20dB, and total reflection when turn-offing with the assurance spst switch avoids increasing loss.In order to reduce loss, SPST electronic switch 1 (104) should be in mutually symmetrical (in schematic diagram and the PCB plate-making) on the circuit with respect to 3dB electric bridge 1 (101) with SPST electronic switch 2 (105); SPST electronic switch 3 (106) should be symmetrical mutually on circuit with respect to 3dB electric bridge 2 (102) with SPST electronic switch 4 (107).
In the device that the present invention proposes, when system is in emission state, SPST electronic switch 3 (106), 4 (107) conductings of spst switch electronics, receive path conducting.Receive-transmit isolation is the isolation sum of circulator 103 and the combination switch unit be made up of 3dB electric bridge 2 (102), SPST electronic switch 3 (106), SPST electronic switch 4 (107) (combination switch 2 is called for short in the back).The isolation of this combination switch can be accomplished to isolate greater than 30dB, and the isolation of circulator generally can reach the isolation greater than 20dB, can reach the above isolation of 50dB at least so the transmitting-receiving of emission state is isolated.When accepting state, because the symmetrical topological structure of this device, receive-transmit isolation is the same with the receive-transmit isolation of emission state.
In the device that the present invention proposes, realize having of high-power tolerance limit easily: 3dB electric bridge 1 (101) and 3dB electric bridge 2 (102), general in the market high-power tolerance limit is in the 100W-500W magnitude; Circulator 103, general in the market high-power tolerance limit is in the 100W-500W magnitude; 50 Europe loads, general in the market high-power tolerance limit is in the 100W-1000W magnitude; What difficulty realized high-power tolerance limit is the SPST electronic switch.Be used for the SPST of transmit-receive switch and the power margin of SPDT electronic switch at present and be generally less than 10W; If have the difficulty that technology realizes with the above switch of 10W, and the power raising can cause cost to be increased sharply.Because the power division effect of 3dB electric bridge 1 (101) and 3dB electric bridge 2 (102), spst switch (104 no matter, 105,106,107) select disconnection or conducting to connect 50 ohm load, its power that bears is half of input power of 3dB electric bridge (101 or 102), and the power of promptly importing 3dB electric bridge (101 or 102) can be 2 times of power margin of SPDT switch, and the power margin of so whole transmit-receive switch is 2 times of power margin of single spst switch.Power capacity is double to have very important meaning in the high power switch field, especially the power margin of SPST improves occasion more difficult or that cause cost sharply to rise, therefore the device of the present invention's proposition is more easily realized technically, and can reduce the realization cost effectively.
Claims (5)
1, a kind of time division duplex transmit-receive switch device is characterized in that comprising circulator (103), 3dB electric bridge 1 (101), 3dB electric bridge 2 (102), SPST electronic switch 1-4 (104-107), 50 ohm load 1-4 (108-111) and control drive unit (113); Described control drive unit (113) is used for the turn-on and turn-off according to control signal controlling and driving SPST electronic switch 1-4 (104-107); The ISOLATED end of the INPUT termination 3dB electric bridge 1 (101) of described circulator (103), the INPUT end of the ISOLATED termination 3dB electric bridge 2 (102) of circulator (103), the OUTPUT end external antenna of described circulator (103); The INPUT termination transmitting terminal signal TX of described 3dB electric bridge 1 (101), I end serial connection SPST electronic switch 1 (104) and 50 ohm load, 1 (108) back ground connection, Q end serial connection SPST electronic switch 2 (105) and 50 ohm load, 2 (109) back ground connection; The ISOLATED termination receiving end signal RX of described 3dB electric bridge 2 (102), Q end serial connection SPST electronic switch 3 (106) and 50 ohm load, 3 (110) back ground connection, I end serial connection SPST electronic switch 4 (107) and 50 ohm load, 4 (111) back ground connection; When system was in emission state, described control drive unit (113) was turn-offed SPST electronic switch 3 (104) and 4 (105) conductings according to state control signal control SPST electronic switch 1 (104) and 2 (105); When system was in accepting state, described control drive unit (113) was according to state control signal control SPST electronic switch 1 (101) and 2 (102) conductings, and SPST electronic switch 3 (106) and 4 (107) turn-offs.
2, a kind of time division duplex transmit-receive switch device according to claim 1 is characterized in that described SPST electronic switch 1-4 (104 1 107) selects the switch of same model.
3, a kind of time division duplex transmit-receive switch device according to claim 1 and 2, the isolation that it is characterized in that described SPST electronic switch 1-4 (104-107) is greater than 20dB.
4, a kind of time division duplex transmit-receive switch device according to claim 1 and 2 is characterized in that described SPST electronic switch 1 (104) and SPST electronic switch 2 (105) are symmetrical mutually on circuit with respect to 3dB electric bridge 1 (101); Described SPST electronic switch 3 (106) is symmetrical mutually on circuit with respect to 3dB electric bridge 2 (102) with SPST electronic switch 4 (107).
5, a kind of time division duplex transmit-receive switch device according to claim 1 and 2 is characterized in that described control drive unit (113) specifically comprises logical operation part, level shifter interface part and the driving amplifier section of polyphone successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101016672A CN1258933C (en) | 2003-10-24 | 2003-10-24 | Time division duplex receiving sending switch device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101016672A CN1258933C (en) | 2003-10-24 | 2003-10-24 | Time division duplex receiving sending switch device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1538766A CN1538766A (en) | 2004-10-20 |
| CN1258933C true CN1258933C (en) | 2006-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101016672A Expired - Fee Related CN1258933C (en) | 2003-10-24 | 2003-10-24 | Time division duplex receiving sending switch device |
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| CN (1) | CN1258933C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4357500B2 (en) * | 2006-05-29 | 2009-11-04 | 株式会社東芝 | Information processing device |
| CN101320980B (en) * | 2007-12-27 | 2013-04-24 | 华为技术有限公司 | Transmitter and signal transmission method |
| CN104104407B (en) * | 2014-05-26 | 2017-01-11 | 北京遥测技术研究所 | Multifunctional microwave transmit-receive front end |
| CN105634532B (en) * | 2014-10-31 | 2018-08-24 | 展讯通信（上海）有限公司 | Signal receiving/transmission device |
| CN105824012B (en) * | 2016-05-15 | 2018-08-24 | 成都安智杰科技有限公司 | A kind of transmit-receive sharing type antenna structure improving radar system receiving and transmitting signal isolation |
| CN109193091A (en) * | 2018-08-22 | 2019-01-11 | 北京遥感设备研究所 | A kind of high isolation ring-shaped component based on coupler |
| CN110109082A (en) * | 2019-04-17 | 2019-08-09 | 天津大学 | A kind of Terahertz Active Radar imaging array of shared antenna |
| CN113271199B (en) * | 2021-05-18 | 2021-12-14 | 广东圣大通信有限公司 | Time division duplex-based transceiver |
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2003
- 2003-10-24 CN CNB2003101016672A patent/CN1258933C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1538766A (en) | 2004-10-20 |
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