CN204733135U - A kind of TD-LTE filter circuit of mobile terminal - Google Patents
A kind of TD-LTE filter circuit of mobile terminal Download PDFInfo
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- CN204733135U CN204733135U CN201520286467.7U CN201520286467U CN204733135U CN 204733135 U CN204733135 U CN 204733135U CN 201520286467 U CN201520286467 U CN 201520286467U CN 204733135 U CN204733135 U CN 204733135U
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Abstract
The utility model relates to a kind of TD-LTE filter circuit of mobile terminal, comprises a BAW bandwidth-limited circuit, the 2nd BAW bandwidth-limited circuit, general low-pass filter circuit and antenna switch circuit; One end of one BAW bandwidth-limited circuit, one end of the 2nd BAW bandwidth-limited circuit and one end of general low-pass filter circuit are connected the first incoming end of antenna switch circuit respectively, and the second incoming end of antenna switch circuit connects the antenna of mobile terminal; The control end of antenna switch circuit connects the CPU level output interface of mobile terminal; The other end of the one BAW bandwidth-limited circuit, the other end of the 2nd BAW bandwidth-limited circuit and the other end of general low-pass filter circuit are connected the modulation-demodulation circuit input of mobile terminal respectively.General low-pass filter circuit is switched when non-WiFi access state, a BAW bandwidth-limited circuit and the 2nd BAW bandwidth-limited circuit is switched when WiFi access state, reduce the interference of WiFi and LTE as much as possible, ensure the transmitting power of LTE, ACLR and power consumption performance simultaneously.
Description
Technical field
The utility model relates to a kind of circuit, particularly relates to a kind of TD-LTE filter circuit of mobile terminal.
Background technology
At present, TD-LTE has 4 frequency ranges, is respectively Band38, Band39, Band40, Band41.The operating frequency of WiFi is: 2412-2472MHz.LTE Band38 frequency range upstream frequency is 2570-2620MHz, and downstream frequency is 2570-2620MHz; LTE Band40 frequency range upstream frequency is 2300-2400MHz, and downstream frequency is 2300-2400MHz; LTE Band41 frequency range upstream frequency is 2496-2690MHz, and downstream frequency is 2496-2690MHz.The operating frequency of visible WiFi and LTE Band38 frequency range, LTE Band40 frequency range, the operating frequency of LTE Band41 frequency range is very close, both coexist and can there is very large interference problem, in order to solve interference problem, usually at the Band38 of TD-LTE, Bnad40, Band41 transmitting path increases BAW bandwidth-limited circuit, the feature of this filter is that attenuation outside a channel increases suddenly, the interference problem eliminated between side frequency can be reached, but there is the Insertion Loss of 2-4dB in BAW band pass filter band, like this to the transmitting power of LTE, Lin Dao reveals ACLR, power consumptions etc. produce a very large impact.
Utility model content
For above-mentioned defect, the purpose of this utility model is the TD-LTE filter circuit providing a kind of mobile terminal, to reduce the interference of WiFi and LTE, reduces the transmitting power to LTE, ACLR, the impact of power consumption performance simultaneously.
For reaching this object, the utility model provides a kind of TD-LTE filter circuit of mobile terminal, it is characterized in that, comprise for the BAW bandwidth-limited circuit to LTE Band38 frequency band signals and the filtering of LTE Band41 frequency band signals, the 2nd BAW bandwidth-limited circuit for the filtering of LTE Band40 frequency band signals, general low-pass filter circuit and antenna switch circuit;
One end of a described BAW bandwidth-limited circuit, one end and one end of described general low-pass filter circuit of described 2nd BAW bandwidth-limited circuit are connected the first incoming end of antenna switch circuit respectively, and the second incoming end of described antenna switch circuit connects the antenna of mobile terminal; The control end of described antenna switch circuit connects the CPU level output interface of mobile terminal; The other end of a described BAW bandwidth-limited circuit, the other end and the other end of described general low-pass filter circuit of described 2nd BAW bandwidth-limited circuit are connected the modulation-demodulation circuit input of mobile terminal respectively.
Preferably, described general low-pass filter circuit comprises model is LF1608-B2R5KCBT/LF low pass filter U1010 and the first impedance matching circuit connecting described low pass filter U1010.
Preferably, described first impedance matching circuit comprises electric capacity C1080, electric capacity C1081, electric capacity C1078, electric capacity C1079, inductance L 1077 and inductance L 1020; One end of inductance L 1077 is all connected the first incoming end of antenna switch circuit with one end of electric capacity C1079, the other end ground connection of electric capacity C1079, the other end of inductance L 1077 connects one end of electric capacity C1078 and the output of low pass filter U1010, the other end ground connection of electric capacity C1078; One end of electric capacity C1081 connects the input of low pass filter U1010 and one end of inductance L 1020, the other end ground connection of electric capacity C1081, the other end of inductance L 1020 connects one end of described electric capacity C1080 and the modulation-demodulation circuit input of described mobile terminal, the other end ground connection of described electric capacity C1080.Preferably, wherein electric capacity C1080 is 0.5pF, and electric capacity C1081 is 5.1pF, and electric capacity C1078 is 1.2pF, and electric capacity C1079 is 2.7pF, and inductance L 1077 is 1.8nH and inductance L 1020 is 1.8nH.
Preferably, a described BAW bandwidth-limited circuit comprises the BAW band pass filter U1003 of ACPF-7041 and the second impedance matching circuit being connected described BAW band pass filter U1003.
Preferably, described second impedance matching circuit comprises electric capacity C1055, inductance L 1008, electric capacity C1056, inductance L 1009, electric capacity C1052 and inductance L 1010; One end of inductance L 1010 is all connected the first incoming end of antenna switch circuit with one end of electric capacity C1052, the other end ground connection of inductance L 1010, the other end of electric capacity C1052 connects one end of inductance L 1009 and the input of BAW band pass filter U1003, the other end ground connection of inductance L 1009; One end of electric capacity C1056 connects the output of BAW band pass filter U1003 and one end of inductance L 1008, the other end ground connection of electric capacity C1056, the other end of inductance L 1008 connects one end of described electric capacity C1055 and the modulation-demodulation circuit input of described mobile terminal, the other end ground connection of described electric capacity C1055.
Preferably, electric capacity C1055 is 5.2pF, and inductance L 1008 is 8pF, and electric capacity C1056 is 1.2pF, and inductance L 1009 is 3.3nH, and electric capacity C1052 is 12pF, and inductance L 1010 is 5.6nH.
Preferably, described 2nd BAW bandwidth-limited circuit comprises model is the BAW filter U1005 of TriQuint-885049 and the 3rd impedance matching circuit being connected described BAW filter U1005.
Preferably,
Described 3rd impedance matching circuit comprises electric capacity C1063, inductance L 1015, inductance L 1064, inductance L 1017, electric capacity C1016, inductance L 1061 and electric capacity C1089; One end of electric capacity C1089 connects the first incoming end of antenna switch circuit, the other end of electric capacity C1089 connects one end of inductance L 1061 and one end of electric capacity C1016, the other end ground connection of electric capacity C1016, the other end of inductance L 1061 connects one end of inductance L 1017 and the output of BAW band pass filter U1005, the other end ground connection of inductance L 1017; One end of inductance L 1064 connects the input of BAW band pass filter U1005 and one end of inductance L 1015, the other end ground connection of inductance L 1064, the other end of inductance L 1015 connects one end of described electric capacity C1063 and the modulation-demodulation circuit input of described mobile terminal, the other end ground connection of described electric capacity C1063.
Preferably, described antenna switch circuit comprises SKY13373 chip, 1st pin of described SKY13373 chip, the 9th pin, the 3rd pin connect one end of a described BAW bandwidth-limited circuit, one end of described 2nd BAW bandwidth-limited circuit and one end of described general low-pass filter circuit respectively, 11st pin of described SKY13373 chip connects the antenna of mobile terminal, and the 4th pin of described SKY13373 chip is connected the CPU level output interface of described mobile terminal with the 5th pin.
The utility model adopts technique scheme, compared with existing technical scheme, has following useful effect:
The selection of circuit switched is carried out by the level of antenna switch circuit reception CPU level output interface, general low-pass filter circuit is switched when non-WiFi access state, a BAW bandwidth-limited circuit and the 2nd BAW bandwidth-limited circuit is switched when WiFi access state, reduce the interference of WiFi and LTE as much as possible, ensure the transmitting power of LTE, ACLR and power consumption performance simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation between the TD-LTE filter circuit of a kind of mobile terminal of the utility model and mobile terminal;
The structural representation that Fig. 2 is a BAW bandwidth-limited circuit of the present utility model, antenna switch circuit is connected with adjustment demodulator circuit;
The structural representation that Fig. 3 is the 2nd BAW bandwidth-limited circuit of the present utility model, antenna switch circuit is connected with adjustment demodulator circuit;
The structural representation that Fig. 4 is low-pass filter circuit of the present utility model, antenna switch circuit is connected with adjustment demodulator circuit;
Fig. 5 is the circuit theory diagrams of general low-pass filter circuit of the present utility model;
Fig. 6 is the circuit theory diagrams of a BAW bandwidth-limited circuit of the utility model embodiment;
Fig. 7 is the circuit theory diagrams of the 2nd BAW bandwidth-limited circuit of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in accompanying drawing 1-4, the utility model provides a kind of TD-LTE filter circuit of mobile terminal, 1. a TD-LTE filter circuit for mobile terminal, comprises for the BAW bandwidth-limited circuit to LTE Band38 frequency band signals and the filtering of LTEBand41 frequency band signals, the 2nd BAW bandwidth-limited circuit for the filtering of LTE Band40 frequency band signals, general low-pass filter circuit and antenna switch circuit;
One end of one BAW bandwidth-limited circuit, one end of the 2nd BAW bandwidth-limited circuit and one end of general low-pass filter circuit are connected the first incoming end of antenna switch circuit respectively, and the second incoming end of antenna switch circuit connects the antenna of mobile terminal; The control end of antenna switch circuit connects the CPU level output interface of mobile terminal; The other end of the one BAW bandwidth-limited circuit, the other end of the 2nd BAW bandwidth-limited circuit and the other end of general low-pass filter circuit are connected the modulation-demodulation circuit input of mobile terminal respectively.
The operating frequency of WiFi and LTE Band38 frequency range, LTE Band40 frequency range, the operating frequency of LTE Band41 frequency range is very close, and both coexist and can there is very large interference problem.Therefore, level is sent by CPU level output interface when WiFi access state, antenna switch circuit is made to switch connection the one BAW bandwidth-limited circuit and the 2nd BAW bandwidth-limited circuit, reduce the interference of WiFi and LTE as much as possible, the feature of this filter is that attenuation outside a channel increases suddenly, can reach the interference problem eliminated between side frequency.But have the Insertion Loss of 2-4dB in BAW band pass filter band, like this to the transmitting power of LTE, Lin Dao reveals ACLR, and power consumption etc. produce a very large impact.In the present embodiment, send level when non-WiFi access state by CPU level output interface, make switching circuit switch connection universal low-pass filter circuit, the Insertion Loss of general low pass filter is lower, ensures the transmitting power of LTE, ACLR and power consumption performance.
In the present embodiment, it is LF1608-B2R5KCBT/LF low pass filter U1010 and the first impedance matching circuit connecting low pass filter U1010 that general low-pass filter circuit comprises model.It is the BAW band pass filter U1003 of CPF-7041 and the second impedance matching circuit being connected BAW band pass filter U1003 that one BAW bandwidth-limited circuit comprises A model.It is the BAW filter U1005 of TriQuint-885049 and the 3rd impedance matching circuit being connected BAW filter U1005 that 2nd BAW bandwidth-limited circuit comprises model.
In the present embodiment, antenna switch circuit comprises SKY13373 chip, 1st pin of SKY13373 chip, 9th pin, 3rd pin connects one end of a BAW bandwidth-limited circuit respectively, one end of 2nd BAW bandwidth-limited circuit and one end of general low-pass filter circuit, 11st pin of SKY13373 chip connects the antenna of mobile terminal, 4th pin of SKY13373 chip is connected the CPU level output interface of mobile terminal with the 5th pin, 2nd pin of SKY13373 chip, 7th pin, 8th pin, 10th pin and the equal ground connection of the 1st pin, 6th pin of SKY13373 chip connects the power output end of mobile terminal.
The selection of circuit switched is carried out by the level of antenna switch circuit reception CPU level output interface, general low-pass filter circuit is switched when non-WiFi access state, LTE Band38 frequency band signals, LTE Band40 frequency band signals, LTE Band41 frequency band signals all walk low-pass filter circuit, the Insertion Loss of low-pass filter circuit is less, has greatly improved to max power, ACLR and power consumption stream.A BAW bandwidth-limited circuit and the 2nd BAW bandwidth-limited circuit is switched to when WiFi access state, LTE Band38 frequency band signals and LTE Band40 frequency band signals walk a BAW bandwidth-limited circuit, LTE Band40 frequency band signals walks the 2nd BAW bandwidth-limited circuit, to reduce the mutual interference with WiFi.
First impedance matching circuit comprises electric capacity C1080, electric capacity C1081, electric capacity C1078, electric capacity C1079, inductance L 1077 and inductance L 1020; Electric capacity C1080 is 0.5pF, and electric capacity C1081 is 5.1pF, and electric capacity C1078 is 1.2pF, and electric capacity C1079 is 2.7pF, and inductance L 1077 is 1.8nH and inductance L 1020 is 1.8nH.One end of inductance L 1077 is all connected the first incoming end of antenna switch circuit with one end of electric capacity C1079, the other end ground connection of electric capacity C1079, the other end of inductance L 1077 connects one end of electric capacity C1078 and the 5th pin of low pass filter U1010, the other end ground connection of electric capacity C1078; One end of electric capacity C1081 connects the 2nd pin of low pass filter U1010 and one end of inductance L 1020, the other end ground connection of electric capacity C1081, the other end of inductance L 1020 connects one end of electric capacity C1080 and the modulation-demodulation circuit input of mobile terminal, the other end ground connection of electric capacity C1080, the 1st pin of low pass filter U1010, the 3rd pin, the 4th pin and the equal ground connection of the 6th pin.
Second impedance matching circuit comprises electric capacity C1055, inductance L 1008, electric capacity C1056, inductance L 1009, electric capacity C1052 and inductance L 1010; Electric capacity C1055 is 5.2pF, and inductance L 1008 is 8pF, and electric capacity C1056 is 1.2pF, and inductance L 1009 is 3.3nH, and electric capacity C1052 is 12pF, and inductance L 1010 is 5.6nH.One end of inductance L 1010 is all connected the first incoming end of antenna switch circuit with one end of electric capacity C1052, the other end ground connection of inductance L 1010, the other end of electric capacity C1052 connects one end of inductance L 1009 and the 2nd pin of BAW band pass filter U1003, the other end ground connection of inductance L 1009; One end of electric capacity C1056 connects the 1st pin of BAW band pass filter U1003 and one end of inductance L 1008, the other end ground connection of electric capacity C1056, the other end of inductance L 1008 connects one end of electric capacity C1055 and the modulation-demodulation circuit input of mobile terminal, the other end ground connection of electric capacity C1055, the 3rd pin ground connection of the logical filter U1003 of BAW band.
3rd impedance matching circuit comprises electric capacity C1063, inductance L 1015, inductance L 1064, inductance L 1017, electric capacity C1016, inductance L 1061 and electric capacity C1089; Electric capacity C1063 is 0.5pF, and inductance L 1015 is 1.8nH, and inductance L 1064 is 5.1nH, and inductance L 1017 is 3.3nH, and electric capacity C1016 is 3.5nH, and inductance L 1061 is 3.5Nh, and electric capacity C1089 is 12pF.One end of electric capacity C1089 connects the first incoming end of antenna switch circuit, the other end of electric capacity C1089 connects one end of inductance L 1061 and one end of electric capacity C1016, the other end ground connection of electric capacity C1016, the other end of inductance L 1061 connects one end of inductance L 1017 and the 4th pin of BAW band pass filter U1005, the other end ground connection of inductance L 1017; One end of inductance L 1064 connects the 1st pin of BAW band pass filter U1005 and one end of inductance L 1015, the other end ground connection of inductance L 1064, the other end of inductance L 1015 connects one end of electric capacity C1063 and the modulation-demodulation circuit input of mobile terminal, the other end ground connection of electric capacity C1063, the 3rd pin of the logical filter U1005 of BAW band, the 5th pin, the equal ground connection of the 2nd pin.
Below be only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. the TD-LTE filter circuit of a mobile terminal, it is characterized in that, comprise for the BAW bandwidth-limited circuit to LTE Band38 frequency band signals and the filtering of LTE Band41 frequency band signals, the 2nd BAW bandwidth-limited circuit for the filtering of LTE Band40 frequency band signals, general low-pass filter circuit and antenna switch circuit;
One end of a described BAW bandwidth-limited circuit, one end and one end of described general low-pass filter circuit of described 2nd BAW bandwidth-limited circuit are connected the first incoming end of antenna switch circuit respectively, and the second incoming end of described antenna switch circuit connects the antenna of mobile terminal; The control end of described antenna switch circuit connects the CPU level output interface of mobile terminal; The other end of a described BAW bandwidth-limited circuit, the other end and the other end of described general low-pass filter circuit of described 2nd BAW bandwidth-limited circuit are connected the modulation-demodulation circuit input of mobile terminal respectively.
2. the TD-LTE filter circuit of a kind of mobile terminal as claimed in claim 1, is characterized in that, described general low-pass filter circuit comprises low pass filter U1010 and connects first impedance matching circuit of described low pass filter U1010.
3. the TD-LTE filter circuit of a kind of mobile terminal as claimed in claim 2, is characterized in that, described first impedance matching circuit comprises electric capacity C1080, electric capacity C1081, electric capacity C1078, electric capacity C1079, inductance L 1077 and inductance L 1020; One end of inductance L 1077 is all connected the first incoming end of antenna switch circuit with one end of electric capacity C1079, the other end ground connection of electric capacity C1079, the other end of inductance L 1077 connects one end of electric capacity C1078 and the output of low pass filter U1010, the other end ground connection of electric capacity C1078; One end of electric capacity C1081 connects the input of low pass filter U1010 and one end of inductance L 1020, the other end ground connection of electric capacity C1081, the other end of inductance L 1020 connects one end of described electric capacity C1080 and the modulation-demodulation circuit input of described mobile terminal, the other end ground connection of described electric capacity C1080.
4. the TD-LTE filter circuit of a kind of mobile terminal as claimed in claim 3, is characterized in that, wherein electric capacity C1080 is 0.5pF, electric capacity C1081 is 5.1pF, electric capacity C1078 is 1.2pF, and electric capacity C1079 is 2.7pF, and inductance L 1077 is 1.8nH and inductance L 1020 is 1.8nH.
5. the TD-LTE filter circuit of a kind of mobile terminal as claimed in claim 1, is characterized in that, a described BAW bandwidth-limited circuit comprises band pass filter U1003 and the second impedance matching circuit being connected described BAW band pass filter U1003.
6. the TD-LTE filter circuit of a kind of mobile terminal as claimed in claim 5, is characterized in that, described second impedance matching circuit comprises electric capacity C1055, inductance L 1008, electric capacity C1056, inductance L 1009, electric capacity C1052 and inductance L 1010; One end of inductance L 1010 is all connected the first incoming end of antenna switch circuit with one end of electric capacity C1052, the other end ground connection of inductance L 1010, the other end of electric capacity C1052 connects one end of inductance L 1009 and the input of BAW band pass filter U1003, the other end ground connection of inductance L 1009; One end of electric capacity C1056 connects the output of BAW band pass filter U1003 and one end of inductance L 1008, the other end ground connection of electric capacity C1056, the other end of inductance L 1008 connects one end of described electric capacity C1055 and the modulation-demodulation circuit input of described mobile terminal, the other end ground connection of described electric capacity C1055.
7. the TD-LTE filter circuit of a kind of mobile terminal as claimed in claim 6, is characterized in that, electric capacity C1055 is 5.2pF, and inductance L 1008 is 8pF, and electric capacity C1056 is 1.2pF, and inductance L 1009 is 3.3nH, and electric capacity C1052 is 12pF, and inductance L 1010 is 5.6nH.
8. the TD-LTE filter circuit of a kind of mobile terminal as claimed in claim 1, is characterized in that, described 2nd BAW bandwidth-limited circuit comprises BAW filter U1005 and the 3rd impedance matching circuit being connected described BAW filter U1005.
9. the TD-LTE filter circuit of a kind of mobile terminal as claimed in claim 8, it is characterized in that, described 3rd impedance matching circuit comprises electric capacity C1063, inductance L 1015, inductance L 1064, inductance L 1017, electric capacity C1016, inductance L 1061 and electric capacity C1089; One end of electric capacity C1089 connects the first incoming end of antenna switch circuit, the other end of electric capacity C1089 connects one end of inductance L 1061 and one end of electric capacity C1016, the other end ground connection of electric capacity C1016, the other end of inductance L 1061 connects one end of inductance L 1017 and the output of BAW band pass filter U1005, the other end ground connection of inductance L 1017; One end of inductance L 1064 connects the input of BAW band pass filter U1005 and one end of inductance L 1015, the other end ground connection of inductance L 1064, the other end of inductance L 1015 connects one end of described electric capacity C1063 and the modulation-demodulation circuit input of described mobile terminal, the other end ground connection of described electric capacity C1063.
10. the TD-LTE filter circuit of a kind of mobile terminal as claimed in claim 1, it is characterized in that, described antenna switch circuit comprises SKY13373 chip, 1st pin of described SKY13373 chip, 9th pin, 3rd pin connects one end of a described BAW bandwidth-limited circuit respectively, one end of described 2nd BAW bandwidth-limited circuit and one end of described general low-pass filter circuit, 11st pin of described SKY13373 chip connects the antenna of mobile terminal, 4th pin of described SKY13373 chip is connected the CPU level output interface of described mobile terminal with the 5th pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520286467.7U CN204733135U (en) | 2015-05-05 | 2015-05-05 | A kind of TD-LTE filter circuit of mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520286467.7U CN204733135U (en) | 2015-05-05 | 2015-05-05 | A kind of TD-LTE filter circuit of mobile terminal |
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| CN204733135U true CN204733135U (en) | 2015-10-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105933014A (en) * | 2016-06-23 | 2016-09-07 | 珠海市魅族科技有限公司 | Signal transmitting system and method for terminal device and the terminal device |
| CN107196674A (en) * | 2017-05-31 | 2017-09-22 | 广东欧珀移动通信有限公司 | Filtering method, device, filtering unit, Wireless Fidelity circuit and mobile terminal |
| CN107294895A (en) * | 2016-03-31 | 2017-10-24 | 华为技术有限公司 | Filter optimization method, wave filter collocation method, relevant device and system |
| CN108233979A (en) * | 2018-01-02 | 2018-06-29 | 联想(北京)有限公司 | Mobile communication equipment and communication means |
-
2015
- 2015-05-05 CN CN201520286467.7U patent/CN204733135U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107294895A (en) * | 2016-03-31 | 2017-10-24 | 华为技术有限公司 | Filter optimization method, wave filter collocation method, relevant device and system |
| CN107294895B (en) * | 2016-03-31 | 2020-12-25 | 华为技术有限公司 | Filter optimization method, filter configuration method, related equipment and system |
| CN105933014A (en) * | 2016-06-23 | 2016-09-07 | 珠海市魅族科技有限公司 | Signal transmitting system and method for terminal device and the terminal device |
| CN107196674A (en) * | 2017-05-31 | 2017-09-22 | 广东欧珀移动通信有限公司 | Filtering method, device, filtering unit, Wireless Fidelity circuit and mobile terminal |
| CN108233979A (en) * | 2018-01-02 | 2018-06-29 | 联想(北京)有限公司 | Mobile communication equipment and communication means |
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