CN108347251B - RF front-end circuit - Google Patents
RF front-end circuit Download PDFInfo
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- CN108347251B CN108347251B CN201710061064.6A CN201710061064A CN108347251B CN 108347251 B CN108347251 B CN 108347251B CN 201710061064 A CN201710061064 A CN 201710061064A CN 108347251 B CN108347251 B CN 108347251B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0064—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with separate antennas for the more than one band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
The present invention provides a kind of RF front-end circuit.The circuit includes: at least one receiving antenna, for receiving input signal；Multiple reception end filters, for being filtered to the input signal；Processing module, for being modulated to the signal after the receiving end filter filtering and frequency-conversion processing；Power amplifier is connected with the processing module, and the signal for obtaining to the processing module amplifies；Multiple sending filters, for being filtered to amplified signal；And at least one transmitting antenna, for sending the signal of the sending filter output.Using independent receiving antenna and transmitting antenna, reduce the requirement of the fade performance to receiving end filter and sending filter, the design difficulty for reducing RF front-end circuit reduces the cost of circuit totality, improves the isolation performance received between signal and transmission signal.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of RF front-end circuit.
Background technique
In existing long term evolution (Long Term Evolution, LTE) communication system, RF front-end circuit is usually adopted
With one be served only for receive signal antenna and one can simultaneously receiving and transmitting signal antenna.While in order to realize the latter's antenna
Transmitting-receiving, needs using duplexer filter or four work filters, this makes, and the design difficulty of filter is larger, higher cost.
Therefore, it is necessary to a kind of new RF front-end circuits, to reduce design difficulty and cost.
Summary of the invention
Problems solved by the invention is: a kind of RF front-end circuit is provided, to reduce design difficulty and cost.
The embodiment of the invention provides a kind of RF front-end circuits, comprising: at least one receiving antenna, for receiving input
Signal；Multiple reception end filters, for being filtered to the input signal；Processing module, for being filtered to the receiving end
The filtered signal of wave device is modulated and frequency-conversion processing；Power amplifier is connected with the processing module, for the place
The signal that reason module obtains amplifies；Multiple sending filters, for being filtered to amplified signal；And at least
A piece transmitting antenna, for sending the signal of the sending filter output.
Optionally, the RF front-end circuit further include: between the receiving antenna and the reception end filter
The first RF switch, for selecting for the input signal to be sent to one in the multiple reception end filter；And
The second RF switch between the transmitting antenna and the sending filter, for selecting the multiple transmitting terminal
The signal after a filter filtering in filter is sent to the transmitting antenna.
Optionally, the RF front-end circuit further include: extractor, the first input end of the extractor and the reception
Antenna is connected, and the second input terminal is for inputting non-cellular signal, the output end of the extractor and the first RF switch phase
Even.
Optionally, the RF front-end circuit includes two receiving antennas.
Optionally, wherein the reception end filter that is correspondingly connected with of a receiving antenna is tunable optic filter group, it is described can
Tuned filter group includes three tunable optic filters, be respectively used to the input signal of high band, Mid Frequency and low-frequency range into
Row filtering.
Optionally, the reception end filter that every receiving antenna is correspondingly connected with is tunable optic filter group, each adjustable
Humorous filter group includes three tunable optic filters, is respectively used to carry out the input signal of high band, Mid Frequency and low-frequency range
Filtering.
Optionally, the RF front-end circuit includes a transmitting antenna.
Optionally, the sending filter that the transmitting antenna is correspondingly connected with is tunable optic filter group, described tunable
Filter group includes three tunable optic filters, be respectively used to the amplified signal of high band, Mid Frequency and low-frequency range into
Row filtering.
Optionally, the sending filter that the transmitting antenna is correspondingly connected with includes three tunable optic filters and a filtering
Device group, three tunable optic filters are connected with the filter group, three tunable optic filters include high band, in
Frequency range and low-frequency range tunable optic filter, the filter group include high band, Mid Frequency and low-frequency range general filter.
Optionally, the RF front-end circuit includes two transmitting antennas, and the first transmitting antenna is for emitting low-frequency range letter
Number and intermediate frequency segment signal, the second transmitting antenna is for emitting high frequency band signal.
Optionally, the sending filter that first transmitting antenna is correspondingly connected be tunable optic filter group, it is described can
Tuned filter group includes two tunable optic filters, is respectively used to filter the amplified signal of Mid Frequency and low-frequency range
Wave, the sending filter that second transmitting antenna is correspondingly connected with are one for filtering to the amplified signal of high band
The tunable optic filter of wave.
Optionally, second transmitting antenna is also used to receive the input that frequency is located in frequency range B7, B38, B40 and B41
Signal.
Optionally, the multiple sending filter includes duplexer filter, for the input to frequency in frequency range B7
The amplified signal of signal and frequency in frequency range B7 is filtered.
Optionally, the multiple reception end filter includes first filter, is used for frequency in frequency range B7 and B41C
Input signal be filtered, wherein the range of the frequency range B41C is 2620MHz~2690MHz.
Optionally, the multiple reception end filter includes second filter, for defeated in frequency range B41AB to frequency
Enter signal to be filtered, wherein the frequency range B41AB includes frequency range B41A and B41B, and the range of the frequency range B41A is
The range of 2496MHz~2570MHz, the frequency range B41B are 2555MHz~2665MHz, and the range of the frequency range B41AB is
2496MHz~2665MHz.
Optionally, the multiple sending filter includes third filter, is used for frequency in frequency range B7 and B41A
Amplified signal be filtered, wherein the range of the frequency range B41A is 2496MHz~2570MHz.
Optionally, the multiple sending filter includes the 4th filter, for the putting in frequency range B41BC to frequency
Signal after big is filtered, wherein the frequency range B41BC includes frequency range B41B and B41C, and the range of the frequency range B41B is
The range of 2555MHz~2665MHz, the frequency range B41C are 2620MHz~2690MHz, and the range of the frequency range B41BC is
2555MHz~2690MHz.
Compared with prior art, technical solution of the present invention has the advantage that
RF front-end circuit provided in an embodiment of the present invention, using independent receiving antenna and transmitting antenna, to use
Multiple single reception end filters and sending filter, compared with using the antenna for realizing transmission-receiving function simultaneously, the present invention
The RF front-end circuit of embodiment need not use duplexer filter or four work filters, reduce the design difficulty and electricity of filter
The cost on road.Also, using independent receiving antenna and transmitting antenna can be improved between input signal and output signal every
From performance, mutual interference is reduced, also reduces and the fade performance of receiving end filter and sending filter is wanted
It asks, to further reduced the cost of circuit.
Further, cellular network and non-cellular (such as global positioning system (Global are realized by using extractor
Positioning System, GPS), WiFi or bluetooth) combination, taken up space to save circuit.
Further, by using two receiving antennas, so that the RF front-end circuit can be used for LTE system.Due to
There are signals Chong Die, that the circuit can also be used in reception, handle and send 2G and 3G standard with the frequency range of 2G and 3G by 4G.
Further, the reception end filter or the sending filter can use tunable optic filter, so that
Number of filter in circuit is less, and the volume of circuit is smaller.
Further, the form that the sending filter can be combined using tunable optic filter and general filter,
To reduce the requirement to the performance of the general filter.
Further, the input signal in frequency range B7, B40 and B41 is received by the way that second transmitting antenna is arranged, it can
To reduce the bandwidth setting of the second receiving antenna, and reduce the design requirement of extractor.
Further, some overlapping frequency ranges or close frequency range, which can be shared, receives end filter or transmitting terminal filtering
Device, to reduce the number of filter of use.
Further, by frequency range B41 be divided into tetra- frequency sub-band of B41A, B41AB, B41BC and B41C (wherein, B41A and
B41C covers frequency range B7).By the way that B41 is divided into B41AB and B41BC, so that corresponding reception end filter and transmitting terminal
The design of filter is more simple, to reduce the cost of filter.By dividing so that B41 includes B41A and B41C, frequency
Section B41C and B7 uses the same reception end filter, and frequency range B41A and B7 use the same sending filter, without
Duplexer filter is used for frequency range B7, therefore further saves cost.
Detailed description of the invention
Fig. 1 is the schematic diagram for the RF front-end circuit that one embodiment of the invention provides；
Fig. 2 be another embodiment of the present invention provides RF front-end circuit schematic diagram；
Fig. 3 is the schematic diagram for the RF front-end circuit that further embodiment of this invention provides；
Fig. 4 is the schematic diagram for the RF front-end circuit that yet another embodiment of the invention provides；And
Fig. 5 be another embodiment of the present invention provides RF front-end circuit schematic diagram.
Specific embodiment
Just as described in the background art, in existing communication system, radio-frequency front-end generallys use one and is served only for receiving signal
Antenna and one can simultaneously receiving and transmitting signal antenna.Transmitting-receiving while in order to realize the latter's antenna needs to filter using duplex
Wave device or four work filters, and the design difficulty of filter is larger, higher cost.New the embodiment of the invention provides one kind
RF front-end circuit.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
The schematic diagram of the RF front-end circuit of one embodiment of the invention offer is shown with reference to Fig. 1, Fig. 1, below to the electricity
The specific structure on road is described in detail.
In some embodiments, the RF front-end circuit 10 is used in mobile terminal, such as mobile phone.The radio-frequency front-end
Circuit 10 include: receiving antenna 101, transmitting antenna 102, notch diplexer 103, multiple reception end filters 104, be located at it is described
Notch diplexer 103 and first RF switch 105 received between end filter 104, processing module 106, power amplification
Device 107, multiple sending filters 108, second between the transmitting antenna 102 and the sending filter 108
RF switch 109.
In some embodiments, the RF front-end circuit 10 includes two for receiving the receiving antenna of input signal
101.With the development of communication technology, more circuits use LTE multiple-input and multiple-output (Multiple-Input Multiple-
Output, MIMO) for technology to improve data throughout, technique at least needs two receiving antennas.
In some embodiments, the reception end filter 104 is for being filtered the input signal, and described first
RF switch 105 is used to select for the input signal to be sent to one in the multiple reception end filter 104, the place
Reason module 106 is used to be modulated the filtered signal of the reception end filter 104 and frequency-conversion processing, the power amplification
The signal that device 107 is used to export the processing module 106 amplifies, and the sending filter 108 is used for the function
The amplified signal of rate amplifier 107 is filtered, and second RF switch 109 filters the multiple transmitting terminal for selecting
The signal after a filter filtering in wave device 108 is sent to the transmitting antenna 102.
As shown in Figure 1, each input signal for receiving 104 alignment processing different frequency range of end filter, particularly, frequency model
The same reception end filter 104 can be shared in the presence of overlapping or close frequency range by enclosing.In some embodiments, the receiving end
Filter 104 includes a filter, for being filtered to input signal of the frequency in frequency range B17 or B20.The present embodiment
In, it (includes B41A and B41B, frequency range is 2496MHz~2665MHz, is covered that frequency range B41, which is divided into B41AB,
Frequency range B38) and B41C (2620MHz~2690MHz), Mid Frequency B41C the filtering of same receiving end can be shared with frequency range B7
Device 104.Frequency range B41AB covers the other parts in frequency range B41 in addition to B41C, corresponds to another reception end filter
104.In some embodiments, the lower limit of the frequency range B41AB can be greater than 2496MHz, be conducive to the design of filter.
In some embodiments, the multiple reception end filter 104 includes single input and three output filter.Such as Fig. 1 institute
Show, by different configurations, the single input and three output filter can add B4, frequency range B3, frequency range B7 to filter to frequency range B1
Wave can also add B4, frequency range B3, frequency range B40 to be filtered to B1, and B4, frequency range B3, frequency range B41 can also be added to filter to B1
Wave.
In some embodiments, similar frequency range can correspond to same power amplifier.As shown in Figure 1, frequency range B12,
The corresponding multiple sending filters 108 of B28, B5, B20 and B8 are connected with same power amplifier 107, frequency range B3, B4, B66,
The corresponding multiple sending filters 108 of B2 and B1 are connected with same power amplifier 107, frequency range B7, B40, B41A and B41BC
Corresponding multiple sending filters 108 are connected with same power amplifier 107.Frequency range B41BC includes B41B and B41C, frequency
Range is 2555MHz~2690MHz.In some embodiments, the upper limit of frequency range B41BC can be lower than 2690MHz, be conducive to filter
The design of device.
In transmitting terminal, frequency range B3, B4 and B66 can share same sending filter 108, and frequency range B41A and frequency range B7 can
To share same sending filter 108, frequency range B41BC corresponds to another sending filter 108.
It will be seen from figure 1 that most of frequency range has oneself corresponding sending filter.And for global mobile communication
System (Global System for Mobile Communication, GSM) corresponding frequency range of standard, since it is not needed together
When sending and receiving data, therefore filter function and other frequency ranges are distinct.For the corresponding frequency range of GSM standard, penetrated described second
Integrated low-pass filter corresponding thereto is provided in frequency switch 109.The corresponding frequency range of GSM standard include B5, B8, B34 and
B2, wherein B5 and B8 belongs to low-frequency range, B34 and B2 and belongs to high band.
Between the corresponding sending filter 108 of frequency range B40, B41A and B41BC and its power amplifier connected 107
It is additionally provided with selection switch.In some embodiments, sending filter 108 corresponding with frequency range B12, B28, B5, B20 and B8
The power that power amplifier 107, the sending filter 108 corresponding with frequency range B3, B4, B66, B2 and B1 being connected are connected
Selection switch is provided in amplifier 107.
The RF front-end circuit 10 further includes four antenna tuners 110, be connected to every antenna and ground terminal it
Between.
RF front-end circuit 10 shown in FIG. 1 includes two transmitting antennas 102, wherein one for low-frequency range in sending
Output signal is located at the signal in frequency range B12, B28, B5, B20, B8, B66, B3, B4, B2 and B1 including frequency；Another with
In the output signal for sending high band, it is located at the signal in frequency range B7, B40, B41A and B41BC including frequency.
In the above-described embodiments, the RF front-end circuit 10 includes two transmitting antennas.However, the present invention is not limited to
This.In some embodiments, the RF front-end circuit can also only include a transmitting antenna.
It can be seen that the RF front-end circuit from foregoing circuit structure and use independent receiving antenna and transmitting antenna,
To use multiple single reception end filters and sending filter.With use the antenna phase for realizing transmission-receiving function simultaneously
Than the RF front-end circuit of the embodiment of the present invention need not use duplexer filter or four work filters, reduce setting for filter
Count the cost of difficulty and circuit.Also, it can be improved to receive signal and send using independent receiving antenna and transmitting antenna and believe
Isolation performance between number reduces mutual interference, also reduces and declines to receiving end filter and sending filter
Subtract the requirement of performance, to further reduced the cost of circuit.
Further, by using two receiving antennas, so that the RF front-end circuit can be used for LTE system.Due to
There are signals Chong Die, that the circuit can also be used in reception, handle and send 2G and 3G standard with the frequency range of 2G and 3G by 4G.
Further, by frequency range B41 be divided into tetra- frequency sub-band of B41A, B41AB, B41BC and B41C (wherein, B41A and
B41C covers frequency range B7).By the way that B41 is divided into B41AB and B41BC, so that corresponding reception end filter and transmitting terminal filter
The design of wave device is more simple, to reduce the cost of filter.By dividing so that B41 includes B41A and B41C, frequency range
B41C and B7 use the same reception end filter, frequency range B41A and B7 use the same sending filter, without for
Frequency range B7 uses duplexer filter, therefore further saves cost.
Further, some overlapping frequency ranges or close frequency range, which can be shared, receives end filter or transmitting terminal filtering
Device, to reduce the number of filter of use.
With reference to Fig. 2, Fig. 2 shows another embodiment of the present invention provides RF front-end circuit schematic diagram, below to this
The specific structure of circuit is described in detail.
The RF front-end circuit 20 include: the transmitting antenna 202, two of two receiving antennas 201, two extractor 203,
Two notch diplexers 204, are located at the notch diplexer 204 and the reception end filter at multiple reception end filters 205
Multiple first RF switches 206, processing module 207, multiple power amplifiers 208, multiple sending filters between 205
209, multiple second RF switches 210 between the transmitting antenna 202 and the sending filter 209, set respectively
Four antenna tuners 211 between each antenna and ground terminal.
In some embodiments, the RF front-end circuit 20 can be used in mobile terminal, such as handheld device (mobile phone
Deng).
In some embodiments, the RF front-end circuit 20 includes two for receiving the receiving antenna of input signal
201.The extractor 203 is for introducing non-cellular signal.Positioned at the first receiving antenna 201 notch diplexer corresponding with its
The first input end of the first extractor 203 between 204 is connected with first receiving antenna 201, and the second input terminal is for defeated
Enter GPS signal, the output end of first extractor 203 is connected with first RF switch 206；Positioned at the second receiving antenna
The first input end and second receiving antenna of the second extractor 203 between 201 and its corresponding notch diplexer 204
201 are connected, and the second input terminal is for inputting WiFi and/or Bluetooth signal, the output end of second extractor 203 and described the
One RF switch 206 is connected.The combination of cellular antenna and non-cellular antenna is realized using the extractor, to save hand
The space of antenna and volume in holding equipment.
In some embodiments, the reception end filter 205 is for being filtered the input signal, and described first
RF switch 206 is used to select for the input signal to be sent to one in the multiple reception end filter 205, the place
Reason module 207 is used to be modulated the filtered signal of the reception end filter 205 and frequency-conversion processing, the power amplification
The signal that device 208 is used to export the processing module 207 amplifies, and the sending filter 209 is used for the function
The amplified signal of rate amplifier 208 is filtered, and second RF switch 210 filters the multiple transmitting terminal for selecting
The signal after a filter filtering in wave device 209 is sent to the transmitting antenna 202.
As shown in Fig. 2, each reception signal for receiving 205 alignment processing different frequency range of end filter, particularly, frequency model
The same reception end filter can be shared in the presence of overlapping or close frequency range by enclosing.In some embodiments, the receiving end filter
Wave device 205 includes a filter, for being filtered to input signal of the frequency in frequency range B17 or B20.In the present embodiment,
Frequency range B41 is divided into B41AB (frequency range is 2496MHz~2665MHz, covers frequency range B38) and B41C
(2620MHz~2690MHz), Mid Frequency B41C can share the same reception end filter with frequency range B7, and B41AB pairs of frequency range
It should be in another reception end filter.In some embodiments, the lower limit of the frequency range B41AB can be greater than 2496MHz, be conducive to filter
The design of wave device can inhibit the interference of the WiFi frequency range from 2.4G.
In some embodiments, the multiple reception end filter 205 includes single input and three output filter.Such as Fig. 2 institute
Show, by different configurations, the single input and three output filter can add B4, frequency range B3, frequency range B7 to filter to frequency range B1
Wave can also add B4, frequency range B3, frequency range B40 to be filtered to B1, and B4, frequency range B3, frequency range B41 can also be added to filter to B1
Wave.
In some embodiments, similar frequency range can correspond to same power amplifier 208.As shown in Fig. 2, frequency range B12,
The corresponding multiple sending filters 209 of B28, B5, B20 and B8 are connected with same power amplifier 208, frequency range B3, B4, B66,
The corresponding multiple sending filters 209 of B2 and B1 are connected with same power amplifier 208, and frequency range B7, B40 and B41 are corresponding
Multiple sending filters 209 are connected with same power amplifier 208.
In transmitting terminal, frequency range B3, B4 and B66 can share same sending filter 209.It is corresponding for GSM standard
Frequency range is provided with integrated low-pass filter corresponding thereto in second RF switch 210.
The RF front-end circuit 20 includes two transmitting antennas 202, and the first transmitting antenna 202 is for low-frequency range in sending
Output signal, be located at the signal in frequency range B12, B28, B5, B20, B8, B3, B4, B66, B2 and B1 etc. including frequency；Second
Transmitting antenna 202 is used to send the output signal of high band, is located at the signal in frequency range B7, B40 and B41 etc. including frequency.
Unlike previous embodiment, in the present embodiment, second transmitting antenna 202 is also used to receive frequency position
Input signal in frequency range B7, B40 and B41.Particularly, since frequency range B7 corresponds to the LTE (Frequency- of frequency division multiplexing
Division Duplexing Long Term Evolution, FDD-LTE), it needs while sending and receiving data, frequency range B7 is corresponding
Sending filter 209 is duplexer filter.It is received in frequency range B7, B40 and B41 by allowing second transmitting antenna 202
Signal, it is possible to reduce the bandwidth of the second receiving antenna 202 is arranged, and the design for reducing second extractor 203 is wanted
It asks.
It can be seen that the RF front-end circuit from foregoing circuit structure and use independent receiving antenna and transmitting antenna,
To use multiple single reception end filters and sending filter.With use the antenna phase for realizing transmission-receiving function simultaneously
Than the RF front-end circuit of the embodiment of the present invention need not use four work filters, reduce the design difficulty and circuit of filter
Cost.Also, the isolation received between signal and transmission signal can be improved using independent receiving antenna and transmitting antenna
Performance reduces mutual interference, also reduces the requirement of the fade performance to receiving end filter and sending filter,
To further reduced the cost of circuit.
Further, frequency range B41 is divided into B41AB and B41C frequency sub-band, so that corresponding receiving end or transmitting terminal filter
The design of wave device is more simple, flexible, further reduces cost.
Further, some overlapping frequency ranges or close frequency range, which can be shared, receives end filter or transmitting terminal filtering
Device, to reduce the number of filter of use.
Further, cellular antenna and non-cellular antenna (such as GPS, WiFi or bluetooth) are realized by using extractor
Combination, to save space shared by antenna and volume in handheld device.
Further, the signal in frequency range B7, B40 and B41 is received by the way that second transmitting antenna is arranged, can subtracted
The bandwidth setting of few second receiving antenna, and reduce the design requirement of second extractor.
Filter number meeting with the requirement that the increase of frequency range and carrier wave polymerize, in the RF front-end circuit of mobile terminal
It is more and more.In order to comply with this requirement, and make the volume of RF front-end circuit smaller, the embodiment of the invention also provides
The RF front-end circuit of other forms, these RF front-end circuits include tunable optic filter.
It is the schematic diagram for the RF front-end circuit that further embodiment of this invention provides with reference to Fig. 3, Fig. 3.
The RF front-end circuit 30 includes: that the transmitting antenna 302, two of two receiving antennas 301, one receiving end is adjustable
Humorous filter group 303,305, one, the power amplifier transmitting terminal tunable optic filter group 306 of processing module 304, three and point
Three antenna tuners 307 not being set between each antenna and ground terminal.
As shown in figure 3, in receiving end, every receiving antenna 301 respectively with 303 phase of receiving end tunable optic filter group
Even.The receiving end tunable optic filter group 303 includes high band tunable optic filter, Mid Frequency tunable optic filter and low frequency
Section tunable optic filter.In some embodiments, the high band tunable optic filter is for being located at 2300MHz to band connection frequency
Input signal within the scope of~2690MHz is filtered；The Mid Frequency tunable optic filter is for being located at band connection frequency
Input signal within the scope of 1805MHz~2170MHz is filtered；The low-frequency range tunable optic filter is used for band connection frequency
Input signal within the scope of 729MHz~960MHz is filtered.
Correspondingly, three power amplifiers 305 are respectively high band power amplifier, Mid Frequency power amplifier and low frequency
Section power amplifier, respectively with high band tunable optic filter, the Mid Frequency in the transmitting terminal tunable optic filter group 306
Tunable optic filter is connected with low-frequency range tunable optic filter.High band in the transmitting terminal tunable optic filter group 306 can
Tuned filter, Mid Frequency tunable optic filter and low-frequency range tunable optic filter are respectively used to lead to amplified to be output
Signal with frequency within the scope of 2300MHz~2690MHz range, 1710MHz~1980MHz range, 699MHz~915MHz
It is filtered.The output signal of the transmitting terminal tunable optic filter group 306 is sent by the transmitting antenna 302.
By using independent receiving antenna and transmitting antenna, so that the design of tunable optic filter is more convenient.It is described to penetrate
All filters in frequency front-end circuit are all made of tunable optic filter, so that the number of filter in circuit is less, circuit
Volume is smaller.
It is understood that, in receiving end, the corresponding frequency of high band tunable optic filter is in above-described embodiment
2300MHz~2690MHz；The corresponding frequency of Mid Frequency tunable optic filter is 1805MHz~2170MHz；Low-frequency range is tunable
The corresponding frequency of filter is 729MHz~960MHz.In transmitting terminal, the corresponding frequency of high band tunable optic filter is
2300MHz~2690MHz；The corresponding frequency of Mid Frequency tunable optic filter is 1710MHz~1980MHz；Low-frequency range is tunable
The corresponding frequency of filter is 699MHz~915MHz.However, the embodiment of the present invention is without being limited thereto.In other embodiments, it sends out
The corresponding specific value range that is high, neutralizing low-frequency range of sending end or receiving end can be different.Due in different embodiments, transmitting terminal
Or there is difference in the number of the tunable optic filter of receiving end, the frequency range accordingly divided also can be different, so that each frequency range is corresponding
Frequency range have differences.
It is the schematic diagram for the RF front-end circuit that yet another embodiment of the invention provides with reference to Fig. 4, Fig. 4.
RF front-end circuit 40 and the main distinction of RF front-end circuit 10 shown in Fig. 1 in the present embodiment are: sending out
Sending end uses tunable optic filter 408.The power amplifier of the RF front-end circuit 40 includes high band power amplifier
407, Mid Frequency power amplifier 407 and low-frequency range power amplifier 407.The high band power amplifier 407 and a high frequency
Section tunable optic filter 408 is connected, and the Mid Frequency power amplifier 407 is connected with a Mid Frequency tunable optic filter 408, institute
Low-frequency range power amplifier 407 is stated to be connected with a low-frequency range tunable optic filter 408.The high band tunable optic filter, institute
It states Mid Frequency tunable optic filter and the low-frequency range tunable optic filter is common with the high band in a filter group 409 respectively
Filter, Mid Frequency general filter are connected with low-frequency range general filter, and the output signal of the filter group 409 is by described
Transmitting antenna 402 is sent.The tunable optic filter is mainly used for the noise for inhibiting receiving end to use frequency range, described common
Filter is mainly used for inhibiting harmonic wave, and the input of tri- tunnel Bing Jiang synthesizes to be exported all the way.It, can by using the tunable optic filter
To reduce the requirement to the performance of the general filter.It is understood that in the embodiment of the present invention, the general filter
Refer to untunable filter.
In some embodiments, three power amplifiers 407 can also directly be connected with a tunable optic filter group,
The i.e. described high band power amplifier 407 is connected with high band tunable optic filter therein, the Mid Frequency power amplifier
407 are connected with Mid Frequency tunable optic filter therein, and the low-frequency range power amplifier 407 and low-frequency range therein are tunable
Filter is connected, and the output end of the tunable optic filter group is connected with the transmission antenna 402.
In some embodiments, two transmitting antennas 402 can be used.The Mid Frequency power amplifier 407 and low frequency
Section power amplifier 407 can respectively in a tunable optic filter group Mid Frequency tunable optic filter and low-frequency range it is tunable
Filter is connected, and the output end of the tunable optic filter group is connected with the first transmitting antenna 402.The high band power amplification
Device 407 is connected with a high band tunable optic filter, the output end and the second transmitting antenna of the high band tunable optic filter
402 are connected.First transmitting antenna 402 is for emitting low-band signal and intermediate frequency segment signal, second transmitting antenna 402
For emitting high frequency band signal.
Fig. 5 be another embodiment of the present invention provides RF front-end circuit schematic diagram.
Difference with RF front-end circuit 40 shown in Fig. 4 is that part receives end filter and also uses tunable filtering
Device.As shown in figure 5, the second receiving antenna 501 is connected with tunable optic filter group 506, the tunable optic filter group 506 has one
A input terminal and three output ends comprising high band tunable optic filter, Mid Frequency tunable optic filter and low-frequency range are adjustable
Humorous filter, the signal that second receiving antenna 501 receives are input to the tunable optic filter by the input terminal
Group 506.(sending end part as Fig. 4 circuit, do not show in figure)
Same above-described embodiment, the high band tunable optic filter is for being located at 2300MHz~2690MHz to band connection frequency
Input signal in range is filtered；The Mid Frequency tunable optic filter be used for band connection frequency be located at 1805MHz~
Input signal within the scope of 2170MHz is filtered；The low-frequency range tunable optic filter is for being located at band connection frequency
Input signal within the scope of 729MHz~960MHz is filtered.
From above-described embodiment as can be seen that tunable filtering can be used in the RF front-end circuit of the embodiment of the present invention
Device.In some embodiments, tunable optic filter only is used in transmitting terminal；In some embodiments, end part is being received using adjustable
Humorous filter；In some embodiments, tunable optic filter is all used in receiving end；In some embodiments, receiving end and transmission
All filters at end are all made of tunable optic filter.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (16)
1. a kind of RF front-end circuit, which is characterized in that including at least one receiving antenna, the first RF switch, multiple receptions
End filter, processing module, power amplifier, multiple sending filters, the second RF switch and at least one transmitting antenna,
Wherein,
At least one receiving antenna is for receiving input signal；
First RF switch is located between the receiving antenna and the reception end filter, for selecting the input
Signal is sent to one in the multiple reception end filter；
The reception end filter is for being filtered the input signal；
The processing module is used to be modulated the signal after the receiving end filter filtering and frequency-conversion processing；
The power amplifier is connected with the processing module, and the signal for exporting to the processing module amplifies；
The multiple sending filter is for being filtered amplified signal；
Second RF switch, will be the multiple for selection between the transmitting antenna and the sending filter
The signal after a filter filtering in sending filter is sent to the transmitting antenna；
At least one transmitting antenna is used to send the signal of the sending filter output.
2. RF front-end circuit as described in claim 1, which is characterized in that further include: extractor, the first of the extractor
Input terminal is connected with the receiving antenna, and the second input terminal is for inputting non-cellular signal, the output end of the extractor and institute
The first RF switch is stated to be connected.
3. RF front-end circuit as described in claim 1, which is characterized in that the RF front-end circuit includes that two piece-root graftings receive day
Line.
4. RF front-end circuit as claimed in claim 3, which is characterized in that the reception that wherein a receiving antenna is correspondingly connected with
End filter is tunable optic filter group, and the tunable optic filter group includes three tunable optic filters, is respectively used to height
The input signal of frequency range, Mid Frequency and low-frequency range is filtered.
5. RF front-end circuit as claimed in claim 3, which is characterized in that the reception that wherein every receiving antenna is correspondingly connected with
End filter is tunable optic filter group, and each tunable optic filter group includes three tunable optic filters, is respectively used to pair
The input signal of high band, Mid Frequency and low-frequency range is filtered.
6. RF front-end circuit as described in claim 1, which is characterized in that the RF front-end circuit includes a transmitting day
Line.
7. RF front-end circuit as claimed in claim 6, which is characterized in that the transmitting terminal filter that the transmitting antenna is correspondingly connected with
Wave device be tunable optic filter group, the tunable optic filter group include three tunable optic filters, be respectively used to high band,
Mid Frequency and the amplified signal of low-frequency range are filtered.
8. RF front-end circuit as claimed in claim 6, which is characterized in that the transmitting terminal filter that the transmitting antenna is correspondingly connected with
Wave device includes three tunable optic filters and a filter group, and three tunable optic filters are connected with the filter group,
Three tunable optic filters include high band, Mid Frequency and low-frequency range tunable optic filter, and the filter group includes height
Frequency range, Mid Frequency and low-frequency range general filter.
9. RF front-end circuit as described in claim 1, which is characterized in that the RF front-end circuit includes two transmitting days
Line, the first transmitting antenna is for emitting low-band signal and intermediate frequency segment signal, and the second transmitting antenna is for emitting high frequency band signal.
10. RF front-end circuit as claimed in claim 9, which is characterized in that the hair that first transmitting antenna is correspondingly connected with
Sending end filter is tunable optic filter group, and the tunable optic filter group includes two tunable optic filters, is respectively used to pair
Mid Frequency and the amplified signal of low-frequency range are filtered, and the sending filter that second transmitting antenna is correspondingly connected with is
One tunable optic filter for being filtered to the amplified signal of high band.
11. RF front-end circuit as claimed in claim 9, which is characterized in that second transmitting antenna is also used to receive frequency
Rate is located at the input signal in frequency range B7, B38, B40 and B41.
12. RF front-end circuit as claimed in claim 11, which is characterized in that the multiple sending filter includes duplex
Filter, for being filtered to frequency in the amplified signal of input signal and frequency in frequency range B7 in frequency range B7
Wave.
13. RF front-end circuit as described in claim 1, which is characterized in that the multiple reception end filter includes first
Filter, for being filtered to input signal of the frequency in frequency range B7 and B41C, wherein the range of the frequency range B41C is
2620MHz~2690MHz.
14. RF front-end circuit as described in claim 1, which is characterized in that the multiple reception end filter includes second
Filter, for being filtered to input signal of the frequency in frequency range B41AB, wherein the frequency range B41AB includes frequency range
The range of B41A and B41B, the frequency range B41A are 2496MHz~2570MHz, the range of the frequency range B41B be 2555MHz~
The range of 2665MHz, the frequency range B41AB are 2496MHz~2665MHz.
15. RF front-end circuit as described in claim 1, which is characterized in that the multiple sending filter includes third
Filter, for being filtered to amplified signal of the frequency in frequency range B7 and B41A, wherein the model of the frequency range B41A
Enclosing is 2496MHz~2570MHz.
16. RF front-end circuit as described in claim 1, which is characterized in that the multiple sending filter includes the 4th
Filter, for being filtered to amplified signal of the frequency in frequency range B41BC, wherein the frequency range B41BC includes frequency
Section B41B and B41C, the range of the frequency range B41B is 2555MHz~2665MHz, and the range of the frequency range B41C is 2620MHz
The range of~2690MHz, the frequency range B41BC are 2555MHz~2690MHz.
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| CN201710061064.6A CN108347251B (en) | 2017-01-25 | 2017-01-25 | RF front-end circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347251B (en) * | 2017-01-25 | 2019-11-05 | 展讯通信（上海）有限公司 | RF front-end circuit |
| CN109547038B (en) * | 2019-01-28 | 2021-06-22 | 惠州Tcl移动通信有限公司 | Inter-band uplink carrier aggregation radio frequency circuit, antenna device and electronic equipment |
| CN111327343A (en) * | 2020-03-06 | 2020-06-23 | 惠州Tcl移动通信有限公司 | Common receiving channel radio frequency device, method and mobile terminal |
| CN111917429B (en) * | 2020-07-24 | 2021-05-18 | 锐石创芯（深圳）科技有限公司 | Radio frequency front end architecture, antenna device and communication terminal |
| CN111817733B (en) * | 2020-07-28 | 2022-04-22 | 惠州Tcl移动通信有限公司 | Radio frequency structure and mobile terminal |
| CN112086746A (en) * | 2020-09-04 | 2020-12-15 | Tcl通讯（宁波）有限公司 | Structure and method for expanding antenna bandwidth and mobile terminal |
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