CN104753466B - The frequency changer circuit of tdd systems - Google Patents
The frequency changer circuit of tdd systems Download PDFInfo
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- CN104753466B CN104753466B CN201310737471.6A CN201310737471A CN104753466B CN 104753466 B CN104753466 B CN 104753466B CN 201310737471 A CN201310737471 A CN 201310737471A CN 104753466 B CN104753466 B CN 104753466B
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Abstract
The present invention relates to a kind of frequency changer circuits of TDD system, with the first transmitting terminal, the first receiving terminal, the second receiving terminal, first, which sends input terminal, the first reception output end and the second reception output end, the frequency changer circuit, includes the first frequency mixer, the first single-pole double-throw switch (SPDT), the second single-pole double-throw switch (SPDT) and the second frequency mixer.First single-pole double-throw switch (SPDT) and the second single-pole double-throw switch (SPDT) be connected to first frequency mixer this to first end side and this to second end side.First transmitting terminal and the first transmission input terminal are separately connected the first end of the first end and second single-pole double-throw switch (SPDT) of first single-pole double-throw switch (SPDT), and first receiving terminal and the first reception output end are separately connected the second end of the second end and second single-pole double-throw switch (SPDT) of first single-pole double-throw switch (SPDT).
Description
Technical field
The present invention relates to time division duplex (TDD) communication systems, more specifically to a kind of frequency conversion of tdd systems
Circuit.
Background technology
LTE（Long Term Evolution, long term evolution) it is by 3GPP（The 3rd Generation
Partnership Project, third generation partner program）The UMTS organized to set up（Universal Mobile
Telecommunications System, Universal Mobile Communication System）The long term evolution of technical standard.LTE common networks are set at present
Standby and end product commercialization is increasingly mature, and frequency range is concentrated mainly on 700-2700MHz.Next generation mobile communication industry and heat
Point application demand is vigorous, and sector application and hot spot application have dedicated frequency range demand (frequency range is likely lower than 700MHz) or be higher than
The public network frequency range demand of 2.7GHz.For the frequency range less than 700MHz or higher than 2.7GHz, due to these frequency ranges distribution more zero
It dissipates, develops insufficient investment, there is presently no available base station and terminal platforms.The solution of relatively optimization is using change at present
The mode of frequency, the different frequency range that will eat dishes without rice or wine are converted into public network frequency range, make the public affairs that work under public network frequency range by up-conversion or down coversion
Net equipment and terminal maturation platform can be applicable in demand above-mentioned.
For the tdd mode of LTE system, terminal supports multiple-input and multiple-output (Multiple-Input
Multiple-Output, MIMO) function, have two to receive a hair（2R1T）Total 3 tunnel radio-frequency channels.To meet demand above-mentioned,
A kind of scheme is that structure as shown in Figure 1 is built by discrete component.No. 3 frequency mixer 101-103,1 set of frequency have been used in Fig. 1
Synthesizer 104,3 tunnel local oscillator link 105-107, wherein PRx are main receiving terminal, SRx auxiliary receptions end.
Another scheme is that structure as shown in Figure 2 is made of integrated circuit component.In fig. 2 include two chips 210,
220.Chip 210 includes frequency synthesizer 211 and two frequency mixers 212,213.Chip 220 include frequency synthesizer 221,
And frequency mixer 222.Chip 210 realizes main reception (PRx) and transmitting (Tx) function, and chip 220 realizes auxiliary reception (SRx) work(
Energy.
Scheme shown in Fig. 2 also can be changed as structure shown in Fig. 3.Include two chips 310,320 in figure 3.Chip 310
Including frequency synthesizer 311 and two frequency mixers 312,313.Chip 320 includes frequency synthesizer 321 and frequency mixer
322.Chip 310 realizes main reception (PRx) and auxiliary reception (SRx) function, and chip 320 realizes transmitting (Tx) function.
In aforementioned three kinds of schemes, the element circuit that the discrete component scheme of Fig. 1 is realized is complicated, it is difficult to meet miniaturization,
Inexpensive demand.Under the configuration of the integrated circuit component scheme of Fig. 2, it is contemplated that LTE_TDD hairs turn to receive portable protective gaps 20us requirements,
Chip 210 can only operate under full-duplex mode, when receiving and dispatching event, locate normally open；In transmitting, chip 220 can close；
When receiving, chip 220 need to be opened in advance.The shortcomings that this scheme, is：2 sets of register configurations are needed, transmitting-receiving event is to driving
It is dynamic to have certain timing requirements；Power consumption is larger, when reception electric current be about 180mA (chip 210)+140mA (chip 220)=
320mA, about 180mA (chip 210) when transmitting, turns receipts state Tx- in hair-like state>Existence time crossover region when Rx, power consumption
For 500mA；Using 2 chips, PCB areas occupied are big；Cost is higher.
Under the configuration of the integrated circuit component scheme of Fig. 3, transmitting-receiving event is respectively completed by two chips 310,320, need to be
Rx->Tx、Tx->Rx respectively closes chip 310, chip 320 is opened in advance and chip 320 is closed, chip 310 opens behaviour in advance
Make.The shortcomings that this scheme is：2 sets of register configurations, transmitting-receiving event are needed there are certain timing requirements to driving；Power consumption：When reception
Electric current is about 160mA (chip 310), and electric current is about 60mA (chip 320) when transmitting, in Tx->Existence time is overlapping when Rx
Area, power consumption 320mA；Using 2 chips, PCB areas occupied are big；Cost is higher.
Invention content
Technical problem to be solved by the invention is to provide a kind of frequency changer circuits of the TDD system of simplification.
The present invention to solve above-mentioned technical problem and the technical solution adopted is that propose a kind of frequency changer circuit of TDD system,
With the first transmitting terminal, the first receiving terminal, the second receiving terminal, the first transmission input terminal, the first reception output end and second connect
Output end is received, which includes that the first frequency mixer, the first single-pole double-throw switch (SPDT), the second single-pole double-throw switch (SPDT) and second are mixed
Frequency device.First frequency mixer has first end, second end and a first frequency input terminal, first frequency input terminal input one local
Oscillator signal.First single-pole double-throw switch (SPDT) has first end, second end and third end, the third end of first single-pole double-throw switch (SPDT)
It is connected to the first end side of first frequency mixer.Second single-pole double-throw switch (SPDT) has first end, second end and third end, this
The third end of two single-pole double-throw switch (SPDT)s is connected to the second end side of first frequency mixer.Wherein first transmitting terminal and this first
The first end that input terminal is separately connected the first end and second single-pole double-throw switch (SPDT) of first single-pole double-throw switch (SPDT) is sent, this
One receiving terminal and the first reception output end are separately connected the second end and second single-pole double throw of first single-pole double-throw switch (SPDT)
The second end of switch.Second frequency mixer has first end, second end and a second frequency input terminal, the second frequency input terminal defeated
Enter a local oscillated signal, which is connected to the first end side of second frequency mixer, the second reception output end
It is connected to the second end side of second frequency mixer.
In one embodiment of this invention, which also has the second transmitting terminal and second sends output end, and should
Frequency changer circuit further includes third single-pole double-throw switch (SPDT) and the 4th single-pole double-throw switch (SPDT).Third single-pole double-throw switch (SPDT) have first end,
The third end at second end and third end, the third single-pole double-throw switch (SPDT) is connected to the first end side of second frequency mixer.4th
Single-pole double-throw switch (SPDT) has first end, second end and a third end, the third end of the 4th single-pole double-throw switch (SPDT) be connected to this second
The second end side of frequency mixer；Wherein second transmitting terminal and the second transmission input terminal is separately connected the third single-pole double throw and opens
The first end of the first end of pass and the 4th single-pole double-throw switch (SPDT), second receiving terminal and the second reception output end are separately connected
The second end of the second end of the third single-pole double-throw switch (SPDT) and the 4th single-pole double-throw switch (SPDT).
In one embodiment of this invention, which is single port frequency mixer.
In one embodiment of this invention, which is dual-port frequency mixer, and above-mentioned frequency changer circuit further includes
First balun circuit and the second balun circuit.First balun circuit is connected to the third end of first single-pole double-throw switch (SPDT) and is somebody's turn to do
Between the first end of first frequency mixer.Second balun circuit be connected to the third end of second single-pole double-throw switch (SPDT) with this first
Between the second end of frequency mixer.
In one embodiment of this invention, which is single port frequency mixer.
In one embodiment of this invention, which is dual-port frequency mixer, and above-mentioned frequency changer circuit further includes
Third balun circuit and the 4th balun circuit.Third balun circuit is connected to the first of second receiving terminal and second frequency mixer
Between end.4th balun circuit is connected between the reception output end and the second end of second frequency mixer.
In one embodiment of this invention, which is dual-port frequency mixer, and above-mentioned frequency changer circuit further includes
Third balun circuit and the 4th balun circuit.Third balun circuit is connected to the third end of second single-pole double-throw switch (SPDT) and is somebody's turn to do
Between the first end of second frequency mixer.4th balun circuit be connected to the third end of second single-pole double-throw switch (SPDT) with this second
Between the second end of frequency mixer.
In one embodiment of this invention, which is unidirectional frequency mixer.
In one embodiment of this invention, which is two-way frequency mixer.
In one embodiment of this invention, above-mentioned frequency changer circuit further includes frequency synthesizer, has an input terminal and one
Output end, the input terminal input a reference clock signal, which exports the local oscillated signal.
In one embodiment of this invention, the frequency synthesizer, first frequency mixer and second frequency mixer are integrated in together
In one chip.
A kind of mobile terminal of the present invention, including frequency changer circuit as described above.
The present invention due to using the technology described above, realizes the transmitting-receiving multiplexing of at least frequency mixer all the way.Therefore the present invention with
The prior art is compared, and is significantly reduced and is received and dispatched event-order serie demand to driving, common network terminal platform is allow easily to answer
With with support Frequency Conversion Design, reduce software development and maintenance cost.Moreover, LTE etc. can be realized using only two-way frequency mixer
TDD system 2R1T or 2R2T multichannel link framework, greatly reduces PCB areas occupied, realize terminal miniaturization at low work(
Consumption, reduces products-hardware cost and development cost, improves development efficiency.
Description of the drawings
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to the tool of the present invention
Body embodiment elaborates, wherein：
Fig. 1 shows a kind of known frequency changer circuit built by discrete component.
Fig. 2 shows a kind of known frequency changer circuits built by integrated circuit.
Fig. 3 shows the known frequency changer circuit built by integrated circuit of another kind.
Fig. 4 shows the frequency changer circuit figure of one embodiment of the invention.
Fig. 5 shows the frequency synthesizer configuration schematic diagram of one embodiment of the invention.
Fig. 6 shows the frequency changer circuit figure of another embodiment of the present invention.
Fig. 7 shows a change case of frequency changer circuit figure shown in Fig. 4.
Fig. 8 shows a change case of frequency changer circuit figure shown in Fig. 6.
Fig. 9 shows another change case of frequency changer circuit figure shown in Fig. 4.
Figure 10 shows another change case of frequency changer circuit figure shown in Fig. 6.
Specific implementation mode
Theme claimed is described referring now to the drawings, refers to phase using identical reference label in whole attached drawings
Same element.In the following description, for the sake of explanation, numerous details be set forth to provide to theme claimed
Comprehensive understanding.It will be apparent, however, that these themes can not also be implemented using these details.In other situations
Under, well known construction and device is shown in block diagram form in order to describe the present invention.
Fig. 4 shows the frequency changer circuit figure of one embodiment of the invention.Refering to what is shown in Fig. 4, frequency changer circuit 400 has transmitting terminal
It is defeated to send input terminal Tx0, the first reception output end PRx0 and the second reception by Tx, the first receiving terminal PRx, the second receiving terminal SRx
Outlet SRx0.Transmitting terminal Tx, the first receiving terminal PRx, the second receiving terminal SRx send signal to side of eating dishes without rice or wine or receive signal.Hair
Input terminal Tx0, the first reception output end PRx0 and the second reception output end SRx0 is sent then to send and connect to internal system circuit
The collection of letters number.Send input terminal Tx0, the first reception output end PRx0 and second receives output end SRx0 and transmitting terminal Tx, first
Receiving terminal PRx, the second receiving terminal SRx are corresponded respectively.
In the present embodiment, the first receiving terminal PRx is main receiving terminal, adjuvant grafting receiving end supplemented by the second receiving terminal SRx.But it can be with
Understand, the definition to the master-slave relationship of two receiving terminals is the needs for real system, and be should not be a limitation of the present invention.
Frequency changer circuit 400 may include that frequency synthesizer 411, the first frequency mixer 412, the second frequency mixer 413, the first hilted broadsword are double
Throw switch 421, the second single-pole double-throw switch (SPDT) 422, the first balun (BALUN) circuit 423, the second balun circuit 424, third balun
Circuit 425, the 4th balun circuit 426 and low-pass filter 427.
Frequency synthesizer 411 has an input terminal and an output end.Frequency synthesizer 411 receives reference clock signal
CLKref, and generate the local oscillated signal needed for frequency mixer.Reference clock signal CLKref enter frequency synthesizer 411 it
Before can be by low-pass filter 427, to eliminate possible high-frequency harmonic.
First frequency mixer 412 has a pair of of first end (left side in Fig. 3), a pair of of second end (right side in Fig. 3) and one first
Frequency input.First frequency input terminal inputs the local oscillated signal from frequency synthesizer 411.First single-pole double-throw switch (SPDT)
421 have first end, second end and third end, are marked respectively with number 1,2,3 in figure.First single-pole double-throw switch (SPDT) 421
Third end is connected to a pair of of first end side of the first frequency mixer 412.Second single-pole double-throw switch (SPDT) 422 has first end, second
End and third end are marked with number 1,2,3 respectively in figure.It is mixed that the third end of second single-pole double-throw switch (SPDT) 422 is connected to first
A pair of of second end side of frequency device 412.In this embodiment, the first frequency mixer 412 is one-way transmission, therefore transmission from right to left
Input terminal Tx0 connects the first end of second single-pole double-throw switch (SPDT) 422, the first single-pole double-throw switch (SPDT) of transmitting terminal Tx connections 421
First end.Signal is sent will from right to left to export to transmitting terminal Tx from input terminal Tx0 inputs are sent.Similarly, the first receiving terminal
The second end of the second single-pole double-throw switch (SPDT) of PRx connections 422, first receives the first single-pole double-throw switch (SPDT) of output end PRx0 connections 421
Second end.Main reception signal also will from right to left be exported to first from the first receiving terminal PRx inputs and receive output end PRx0.
Second frequency mixer 413 has a pair of of first end（Left side）, a pair of of second end（Right side）With a second frequency input terminal.
Second frequency input terminal inputs the local oscillated signal from frequency synthesizer 411.In this embodiment, the second frequency mixer 413
For from left to right one-way transmission, the second receiving terminal SRx is connected to a pair of of first end side of the second frequency mixer 413, this second connects
Receive a pair of of second end side that output end SRx0 is connected to the second frequency mixer.Auxiliary reception signal will be defeated from the second receiving terminal SRx
Enter, from left to right exports to second and receive output end SRx0.
The first balun circuit 423 is also respectively provided between the second frequency mixer 413 and each single-pole double-throw switch (SPDT) 421,422
With the second balun circuit 424.The third end that first balun circuit 423 is connected to the first single-pole double-throw switch (SPDT) 421 is mixed with first
Between the first end of device 413.The third end that second balun circuit 424 is connected to the second single-pole double-throw switch (SPDT) 422 is mixed with first
Between the second end of device 412.
It is also respectively provided with third balun between frequency mixer 413 and the second receiving terminal SRx, the second reception output end SRx0
Circuit 425 and the 4th balun circuit 426.Third balun circuit 425 is arranged between the second receiving terminal SRx and frequency mixer 413.The
The setting of four balun circuits 426 is received in frequency mixer 413 and second between output end SRx0 and frequency mixer 413.
In the present embodiment, frequency synthesizer 411, the first frequency mixer 412 and the second frequency mixer 413 can be integrated in same
In chip 410.
Under the configuration of the present embodiment, chip 410 is operated in full duplex operating mode, when receiving and dispatching event, locates normally open,
Power consumption is about 180mA.By dragging down enable pin when sleep state so that frequency synthesizer 411 is in low power consumpting state.
Frequency synthesizer 411 can complete register configuration in system initialization, and configuration mode can be such as Fig. 5 institutes
Show.In view of system power dissipation requirement, frequency synthesizer is drawn high when doing system wake-up here and enables logic, makes lock-out state at frequency synthesizer；System
Frequency synthesizer is dragged down when sleep and enables logic, makes low power consumpting state at frequency synthesizer.
Advantage of this embodiment is that, it is only necessary to a set of register configuration, to driving without timing requirements, R＆D risk is small, and
Using only 1 chip, PCB areas occupied are small, can meet miniature requirement and at low cost.
Design philosophy based on above-described embodiment, can further expensive chip 410 design, realize LTE_A_TDD terminals
Double reception double send (2R2T) 4 channel link frameworks.Fig. 6 shows the frequency changer circuit figure of another embodiment of the present invention.With reference to figure 6
Shown, this frequency changer circuit 600 has the first transmitting terminal PTx, the second transmitting terminal STx, the first receiving terminal PRx, the second receiving terminal
SRx, first, which sends input terminal PTx0, the second transmission input terminal STx0, the first reception output end PRx0 and second, receives output
Hold SRx0.First transmitting terminal PTx, the second transmitting terminal STx, the first receiving terminal PRx, the second receiving terminal SRx send letter to side of eating dishes without rice or wine
Number or receive signal.First sends input terminal PTx0, second sends input terminal STx0, first receives output end PRx0 and the
Two reception output end SRx0 then send and receive signal to internal system circuit.First transmission input terminal PTx0, the second transmission are defeated
Enter to hold STx0, first to receive output end PRx0 and second and receives output end SRx0 and the first transmitting terminal PTx, the second transmitting terminal
STx, the first receiving terminal PRx, the second receiving terminal SRx are corresponded respectively.
In the present embodiment, the first transmitting terminal PTx is main transmitting terminal, and the second transmitting terminal STx is auxiliary transmitting terminal, and first connects
Receiving end PRx is main receiving terminal, adjuvant grafting receiving end supplemented by the second receiving terminal SRx.It is to be understood that being received to two transmitting terminals and two
The definition of the master-slave relationship at end is the needs for real system, and be should not be a limitation of the present invention.
Frequency changer circuit 600 may include that frequency synthesizer 611, the first frequency mixer 612, the second frequency mixer 613, the first hilted broadsword are double
Throw switch 621, the second single-pole double-throw switch (SPDT) 422, third single-pole double-throw switch (SPDT) 625,626, first bars of the second single-pole double-throw switch (SPDT)
Human relations (BALUN) circuit 623, the second balun circuit 624, third balun circuit 625, the 4th balun circuit 628 and low-pass filtering
Device 629.
Frequency synthesizer 611 has an input terminal and an output end.Frequency synthesizer 611 receives reference clock signal
CLKref, and generate the local oscillated signal needed for frequency mixer.Reference clock signal CLKref enter frequency synthesizer 611 it
Before can be by low-pass filter 629, to eliminate possible high-frequency harmonic.
First frequency mixer 612 has a pair of of first end (left side in Fig. 6), a pair of of second end (right side in Fig. 6) and one first
Frequency input.First frequency input terminal inputs the local oscillated signal from frequency synthesizer 611.First single-pole double-throw switch (SPDT)
621 have first end, second end and third end, are marked respectively with number 1,2,3 in figure.First single-pole double-throw switch (SPDT) 621
Third end is connected to a pair of of first end side of the first frequency mixer 612.Second single-pole double-throw switch (SPDT) 622 has first end, second
End and third end are marked with number 1,2,3 respectively in figure.It is mixed that the third end of second single-pole double-throw switch (SPDT) 622 is connected to first
A pair of of second end side of frequency device 612.In this embodiment, the first frequency mixer 612 is one-way transmission from right to left, therefore first
The first end of the second single-pole double-throw switch (SPDT) of input terminal PTx0 connections 622 is sent, first transmitting terminal PTx the first single-pole double throws of connection are opened
Close 621 first end.Input terminal PTx0 inputs will be sent from first by sending signal, be exported from right to left to the first transmitting terminal PTx.
Similarly, the second end of the second receiving terminal SRx connection thirds single-pole double-throw switch (SPDT) 625, second receives output end SRx0 connections the
The second end of four single-pole double-throw switch (SPDT)s 626.Auxiliary reception signal also will from the second receiving terminal SRx input, export from right to left to
Second receives output end SRx0.
Second frequency mixer 613 has a pair of of first end（Left side）, a pair of of second end（Right side）With a second frequency input terminal.
Second frequency input terminal inputs the local oscillated signal from frequency synthesizer 611.Third single-pole double-throw switch (SPDT) 625 has first
End, second end and third end are marked with number 1,2,3 respectively in figure.The third end of third single-pole double-throw switch (SPDT) 625 is connected to
A pair of of first end side of second frequency mixer 613.4th single-pole double-throw switch (SPDT) 626 has first end, second end and third end,
It is marked respectively with number 1,2,3 in figure.The third end of 4th single-pole double-throw switch (SPDT) 626 is connected to a pair of the second frequency mixer 613
Second end side.In this embodiment, the second frequency mixer 613 is from left to right one-way transmission, therefore the second transmission input terminal
The first end of STx0 connection thirds single-pole double-throw switch (SPDT) 625, the of the 4th single-pole double-throw switch (SPDT) 626 of the second transmitting terminal STx connections
One end.Input terminal STx0 inputs will be sent from second by sending signal, from left to right be exported to the second transmitting terminal STx.Similarly,
The second end of two receiving terminal SRx connection thirds single-pole double-throw switch (SPDT)s 625, second receives the 4th single-pole double throw of output end SRx0 connections
The second end of switch 626.Auxiliary reception signal also will from left to right export defeated to the second reception from the second receiving terminal SRx inputs
Outlet SRx0.
The first balun circuit 623 and are also respectively provided between frequency mixer 612 and each single-pole double-throw switch (SPDT) 621,622
Two balun circuits 624.First balun circuit 623 is connected to third end and the first frequency mixer 612 of the first single-pole double-throw switch (SPDT) 621
A pair of of first end between.Second balun circuit 624 is connected to third end and the first frequency mixer of the second single-pole double-throw switch (SPDT) 622
Between 612 a pair of of second end.
It is also respectively provided with third balun circuit 627 between frequency mixer 613 and each single-pole double-throw switch (SPDT) 625,626
With the 4th balun circuit 628.Third balun circuit 627 is arranged between third single-pole double-throw switch (SPDT) 625 and frequency mixer 613.The
Four balun circuits 426 are arranged between the second frequency mixer 413 and the 4th single-pole double-throw switch (SPDT) 626.
In the present embodiment, frequency synthesizer 611, the first frequency mixer 612 and the second frequency mixer 613 can be integrated in same
In chip 610.
In the aforementioned embodiment, since frequency mixer is one-way transmission, if to realize larger frequency translation, multiple in transmitting-receiving
With frequency mixer all the way（Such as frequency mixer 412,612,613）It need to select the peripheral components for capableing of cover transformation frequency range, such as balun circuit
And single-pole double-throw switch (SPDT).
Although above-described embodiment shows that frequency mixer is one-way transmission, frequency mixer can also be transmitted in both directions.Shown in Fig. 4
It is variable to turn to embodiment illustrated in fig. 7 for embodiment.Refering to what is shown in Fig. 7, the first frequency mixer 412a becomes the mixed of transmitted in both directions
Frequency device.Transmitting terminal Tx and the first receiving terminal PRx can be connected directly between a pair of of first end side of the first frequency mixer 412a at this time
（That is left side）, and transmitting terminal input Tx0 and the first receiving terminal PRx0 can be connected directly between a pair of the of the first frequency mixer 412a
Two ends side（That is right side）.This had both brought the simplification of wiring, but also balun circuit and hilted broadsword positioned at frequency mixer the same side
Commutator need to only cover relatively narrow frequency range.Such as single-pole double-throw switch (SPDT) 421 and balun circuit 423 need to cover frequency range of eating dishes without rice or wine.
Similar, it is variable to turn to embodiment illustrated in fig. 8 for embodiment illustrated in fig. 6.Refering to what is shown in Fig. 8, first is mixed
Frequency device 612a becomes the frequency mixer of transmitted in both directions.The first transmitting terminal PTx and the first receiving terminal PRx can be connected directly between at this time
A pair of of first end side of one frequency mixer 412a（That is left side）, and the first transmitting terminal inputs PTx0 and the first receiving terminal PRx0
It is connected directly between a pair of of second end side of the first frequency mixer 612a（That is right side）.Equally, the second frequency mixer 613a becomes two-way
The frequency mixer of transmission.The second transmitting terminal STx and the second receiving terminal SRx can be connected directly between the one of the second frequency mixer 613a at this time
To first end side（That is left side）, and the second transmitting terminal input STx0 and the second receiving terminal SRx0 can be connected directly between second and mix
A pair of of second end side of frequency device 613a（That is right side）.This had both brought the simplification of wiring, but also being located at frequency mixer the same side
Balun circuit and single-pole double-throw switch (SPDT) need to only cover relatively narrow frequency range.
While the aforementioned embodiment describe that frequency mixer is dual-port and uses balun circuit in the port of both sides, however it is mixed
Device can also be single port.In this case, without using balun circuit, each chain of input/output terminal directly in multiplexing frequency mixer
Connecing switch can implement.It is variable to turn to embodiment illustrated in fig. 9 for embodiment illustrated in fig. 4.Refering to what is shown in Fig. 9, frequency mixer
412a is single port, there is no need to use balun circuit, is directly connected with the third end of single-pole double-throw switch (SPDT) 421,422.In addition,
Single port can also be used in frequency mixer 413a.
Similarly, variable to turn to embodiment illustrated in fig. 10 for embodiment illustrated in fig. 6.Refering to what is shown in Fig. 10, mixing
Device 612a is that single port is directly connected with the third end of single-pole double-throw switch (SPDT) 621,622 there is no need to use balun circuit.Separately
Outside, single port can also be used in frequency mixer 613a, direct and single-pole double-throw switch (SPDT) 625,626 there is no need to use balun circuit
Third end connects.
The embodiment of the present invention realizes the transmitting-receiving multiplexing of at least frequency mixer all the way by the improvement to frequency changer circuit.Therefore
The present invention is significantly reduced receives and dispatches event-order serie demand to driving, and common network terminal platform is allow easily to be multiplexed and support
Frequency Conversion Design reduces software development and maintenance cost.Moreover, the TDD systems such as LTE can be realized using only two-way frequency mixer
2R1T or 2R2T multichannel link frameworks, greatly reduce PCB areas occupied, realize terminal miniaturization at and low-power consumption, reduce
Products-hardware cost and development cost, improve development efficiency.
Although the present invention is described with reference to current specific embodiment, those of ordinary skill in the art
It should be appreciated that above embodiment is intended merely to illustrate the present invention, can also make in the case of no disengaging spirit of that invention
Go out various equivalent change or replacement, therefore, as long as to the variation of above-described embodiment, change in the spirit of the present invention
Type will all be fallen in the range of following claims.
Claims (12)
1. a kind of frequency changer circuit of tdd systems has the first transmitting terminal, the first receiving terminal, the second receiving terminal, the first hair
Input terminal, first is sent to receive output end and second receive output end, which includes：
First frequency mixer has first end, second end and a first frequency input terminal, first frequency input terminal input one local
Oscillator signal, first frequency mixer are from second end to first end one-way transmission；First single-pole double-throw switch (SPDT) has first
End, second end and third end, the third end of first single-pole double-throw switch (SPDT) are connected to the first end side of first frequency mixer；
There is second single-pole double-throw switch (SPDT) first end, second end and third end, the third end of second single-pole double-throw switch (SPDT) to connect
In the second end side of first frequency mixer；
Wherein first transmitting terminal and the first transmission input terminal is separately connected the first end of first single-pole double-throw switch (SPDT) and is somebody's turn to do
The first end of second single-pole double-throw switch (SPDT), first receiving terminal and the first reception output end are separately connected second single-pole double throw
The second end of the second end of switch and first single-pole double-throw switch (SPDT)；
Second frequency mixer has first end, second end and a second frequency input terminal, second frequency input terminal input one local
Oscillator signal, second receiving terminal are connected to the first end side of second frequency mixer, which is connected to this
The second end side of second frequency mixer.
2. frequency changer circuit as described in claim 1, which is characterized in that the frequency changer circuit also has the second transmitting terminal and the second hair
Output end is sent, and the frequency changer circuit further includes：
There is third single-pole double-throw switch (SPDT) first end, second end and third end, the third end of the third single-pole double-throw switch (SPDT) to connect
In the first end side of second frequency mixer；
There is 4th single-pole double-throw switch (SPDT) first end, second end and third end, the third end of the 4th single-pole double-throw switch (SPDT) to connect
In the second end side of second frequency mixer；Wherein second transmitting terminal and the second transmission input terminal is separately connected the third hilted broadsword
The first end of the first end of commutator and the 4th single-pole double-throw switch (SPDT), second receiving terminal and the second reception output end point
The second end of the second end and the 4th single-pole double-throw switch (SPDT) of the third single-pole double-throw switch (SPDT) is not connected.
3. frequency changer circuit as claimed in claim 1 or 2, which is characterized in that first frequency mixer is single port frequency mixer.
4. frequency changer circuit as claimed in claim 1 or 2, which is characterized in that first frequency mixer is dual-port frequency mixer, the change
Frequency circuit further includes：
First balun circuit, be connected to the third end of first single-pole double-throw switch (SPDT) and first frequency mixer first end it
Between；
Second balun circuit, be connected to the third end of second single-pole double-throw switch (SPDT) and first frequency mixer second end it
Between.
5. frequency changer circuit as claimed in claim 1 or 2, which is characterized in that second frequency mixer is single port frequency mixer.
6. frequency changer circuit as described in claim 1, which is characterized in that second frequency mixer is dual-port frequency mixer, the frequency conversion
Circuit further includes：
Third balun circuit is connected between second receiving terminal and the first end of second frequency mixer；
4th balun circuit is connected between the second reception output end and the second end of second frequency mixer.
7. frequency changer circuit as claimed in claim 2, which is characterized in that second frequency mixer is dual-port frequency mixer, the frequency conversion
Circuit further includes：
Third balun circuit, be connected to the third end of second single-pole double-throw switch (SPDT) and second frequency mixer first end it
Between；
4th balun circuit, be connected to the third end of second single-pole double-throw switch (SPDT) and second frequency mixer second end it
Between.
8. frequency changer circuit as claimed in claim 1 or 2, which is characterized in that first frequency mixer is unidirectional frequency mixer.
9. frequency changer circuit as claimed in claim 1 or 2, which is characterized in that second frequency mixer is two-way frequency mixer.
10. frequency changer circuit as claimed in claim 1 or 2, which is characterized in that further include：
There is frequency synthesizer an input terminal and an output end, the input terminal to input a reference clock signal, output end output
The local oscillated signal.
11. frequency changer circuit as claimed in claim 10, which is characterized in that the frequency synthesizer, first frequency mixer and this
Two frequency mixers are integrated in same chip.
12. a kind of mobile terminal, including such as claim 1-11 any one of them frequency changer circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310737471.6A CN104753466B (en) | 2013-12-27 | 2013-12-27 | The frequency changer circuit of tdd systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310737471.6A CN104753466B (en) | 2013-12-27 | 2013-12-27 | The frequency changer circuit of tdd systems |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104753466A CN104753466A (en) | 2015-07-01 |
| CN104753466B true CN104753466B (en) | 2018-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310737471.6A Active CN104753466B (en) | 2013-12-27 | 2013-12-27 | The frequency changer circuit of tdd systems |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106093566B (en) * | 2016-05-18 | 2018-10-30 | 中国电子科技集团公司第四十一研究所 | A kind of switch frequency conversion component |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101064522A (en) * | 2006-04-24 | 2007-10-31 | 中兴通讯股份有限公司 | Multifunctional transceiver for time division duplexing system |
| CN101150359A (en) * | 2006-09-19 | 2008-03-26 | 普天信息技术研究院 | A method and device for realizing time division duplex RF transceiver |
| CN101162912A (en) * | 2007-11-19 | 2008-04-16 | 上海士康射频技术有限公司 | Single chip radio frequency transceiver |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7783263B2 (en) * | 2006-12-14 | 2010-08-24 | Texas Instruments Incorporated | Simplified digital predistortion in a time-domain duplexed transceiver |
| CN101321012A (en) * | 2007-06-06 | 2008-12-10 | 北京信威通信技术股份有限公司 | Method and device for implementing radio frequency link transmit-receive sharing by switch array in TDD mode |
| KR100946098B1 (en) * | 2008-02-21 | 2010-03-10 | 삼성전기주식회사 | Wireless communication apparatus of time division type |
| CN102163987B (en) * | 2011-04-11 | 2014-03-26 | 京信通信系统（广州）有限公司 | TDD (time division duplex) radio-frequency receiving/emission circuit for discrete baseband signals |
-
2013
- 2013-12-27 CN CN201310737471.6A patent/CN104753466B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101064522A (en) * | 2006-04-24 | 2007-10-31 | 中兴通讯股份有限公司 | Multifunctional transceiver for time division duplexing system |
| CN101150359A (en) * | 2006-09-19 | 2008-03-26 | 普天信息技术研究院 | A method and device for realizing time division duplex RF transceiver |
| CN101162912A (en) * | 2007-11-19 | 2008-04-16 | 上海士康射频技术有限公司 | Single chip radio frequency transceiver |
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| CN104753466A (en) | 2015-07-01 |
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