CN110808722A - Circuit for improving LTE diversity sensitivity - Google Patents
Circuit for improving LTE diversity sensitivity Download PDFInfo
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- CN110808722A CN110808722A CN201910950299.XA CN201910950299A CN110808722A CN 110808722 A CN110808722 A CN 110808722A CN 201910950299 A CN201910950299 A CN 201910950299A CN 110808722 A CN110808722 A CN 110808722A
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- 230000035945 sensitivity Effects 0.000 title claims abstract description 17
- 230000003321 amplification Effects 0.000 claims abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
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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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The invention relates to the technical field of communication, in particular to a circuit for improving LTE diversity sensitivity, which comprises a diversity antenna, a low-noise amplification circuit, a three-in-one combiner circuit and a 4G LTE module; the receiving end of the diversity antenna is connected with the signal input end of the low-noise amplifying circuit; the signal output end of the low-noise amplifying circuit is connected with the common input end of the three-in-one combiner circuit; the three-in-one combiner circuit comprises three branch diversity ports, the branch diversity ports are respectively connected with receiving diversity ports of the 4G LTE modules matched with the branch diversity ports, and a low-noise amplification circuit is additionally arranged between the diversity antenna and the 4G LTE modules to improve the signal-to-noise ratio of radio frequency signals, so that the data transmission rate is improved, and the obvious improvement of the LTE downlink transmission rate is realized.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a circuit for improving LTE diversity sensitivity.
Background
At present, with the large-scale development and popularization of 4G networks, LTE networks have become a main mobile data transmission mode, and among them, the most user is concerned about the downlink download speed, and the diversity sensitivity plays an important role in the downlink speed, which directly affects the user experience, and especially in areas with weak signals, it becomes more important to improve the terminal client internet speed, the video smoothness, the download speed, and the like.
Disclosure of Invention
In view of this, the present invention aims to overcome the defects in the prior art, and provide a higher requirement for LTE diversity sensitivity, and in order to increase the downlink data rate, the present invention mainly adds a low noise amplifier circuit to LTE diversity to increase the sensitivity of LTE full-band diversity, thereby significantly increasing the antenna reception performance, increasing the diversity sensitivity of LTE modes, and providing a higher-speed internet experience for users.
The circuit for improving the LTE diversity sensitivity comprises a diversity antenna, a low-noise amplification circuit, a three-in-one combiner circuit and a 4G LTE module; the receiving end of the diversity antenna is connected with the signal input end of the low-noise amplifying circuit; the signal output end of the low-noise amplifying circuit is connected with the common input end of the three-in-one combiner circuit; the three-in-one combiner circuit comprises three shunt diversity ports, and the shunt diversity ports are respectively connected with receiving diversity ports of the 4G LTE modules matched with the shunt diversity ports.
Furthermore, the low noise amplifier circuit comprises a low noise amplifier and a filter circuit, the grounding ports of the low noise amplifier are respectively grounded correspondingly, and the radio frequency input port and the radio frequency output port of the low noise amplifier are respectively connected in series with the filter circuit.
Further, the three-in-one combiner circuit comprises a common end of the three-in-one combiner and a branch port circuit; the three-in-one combiner is connected with the ground port of the three-in-one combiner correspondingly, the common port and the shunt port of the three-in-one combiner are respectively connected with a resistor in series, and two ends of the resistor are respectively connected with a capacitor in parallel.
Further, the low-noise amplification circuit is powered by a 3.3V direct current signal.
Furthermore, the power supply circuit of the 4G LTE module adopts an LDO chip MIC29302 AWU.
The diversity antenna sends the received radio frequency signal with specific frequency to the low-noise amplifying circuit, the radio frequency signal is amplified by the low-noise amplifying circuit to improve the signal-to-noise ratio of the radio frequency signal, the signal-to-noise ratio can be obtained according to a Shannon formula of a communication principle, and the signal-to-noise ratio directly determines the channel capacity of a channel, namely the data transmission rate, when the channel bandwidth is fixed, so that the improvement of the signal-to-noise ratio can bring obvious improvement of the LTE downlink transmission rate; and finally, the radio frequency signals amplified by the low-noise amplifying circuit enter the three-in-one combiner, respectively enter the respective 4G LTE receiving diversity ports, and enter the corresponding receiving and transmitting circuits in the 4G LTE modules.
The invention has the beneficial effects that: according to the circuit for improving the sensitivity of the LTE diversity, disclosed by the invention, the signal-to-noise ratio of a radio frequency signal is improved by adding the low-noise amplification circuit between the diversity antenna and the 4G LTE module, so that the data transmission rate is improved, and the obvious improvement of the downlink transmission rate of the LTE is realized.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a circuit diagram of a low noise amplifier circuit according to the present invention;
fig. 3 is a circuit diagram of the three-in-one combiner circuit of the present invention.
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention, and as shown in the figure, the circuit for improving LTE diversity sensitivity in this embodiment includes a diversity antenna, a low noise amplifier circuit, a three-in-one combiner circuit, and a 4G LTE module; the receiving end of the diversity antenna is connected with the signal input end of the low-noise amplifying circuit; the signal output end of the low-noise amplifying circuit is connected with the common input end of the three-in-one combiner circuit; the three-in-one combiner circuit comprises three shunt diversity ports, and the shunt diversity ports are respectively connected with receiving diversity ports of the 4G LTE modules matched with the shunt diversity ports.
Fig. 2 is a circuit diagram of a low noise amplifier circuit according to the present invention, wherein the low noise amplifier circuit includes a low noise amplifier, in this embodiment, the type of the low noise amplifier is TQP3M9037, and the main parameters of the low noise amplifier are that the bandwidth is 0.7 to 6.0GHz, the 1.95GHz noise is 0.4dB, the 1.95GHz gain is 20dB, and the output third-order intermodulation intercept point (IP3) is +35 dBm. The low noise amplifier is characterized in that the types of the low noise amplifier are that grounding pins NC1, NC2, NC4, NC5 and NC6 of the low noise amplifier are respectively grounded correspondingly, a radio frequency input port RFIN and a radio frequency output port RFOUT of the low noise amplifier are respectively connected with C14 and C16 in series, and the C15 and the C17 are connected with L-shaped matching of the ground in parallel, 50-ohm impedance matching is performed on signals received and sent by the radio frequency input port RFIN and the radio frequency output port RFOUT, the radio frequency output port RFOUT is connected with a 3.3V direct current signal and an inductor L11, and the radio frequency output port RFOUT is connected with the radio frequency input port RFIN after being connected with resistors R12 and R16 in series to realize cost down compatibility. The DOWN pin of the low noise amplifier is externally connected with R13 and R14 to realize the shut-DOWN function. The low-noise amplification circuit inputs radio frequency signals through a radio frequency input port RFIN, improves the signal-to-noise ratio of the radio frequency signals through the noise amplifier TQP3M9037, and outputs the radio frequency signals to a shunt diversity port A of the low-noise amplification circuit through a radio frequency output port RFOUT.
Fig. 3 is a circuit diagram of a three-in-one combiner circuit of the present invention, as shown in fig. 3, including a three-in-one combiner common and shunt port circuit; in this embodiment, the model of the three-in-one combiner is SEPS-3-33, ground pins GND1-GND18 of the three-in-one combiner are respectively grounded correspondingly, a signal input pin SUM _ PORT is connected in series with a resistor R24 to facilitate debugging and 50 ohm impedance matching, two ends of the resistor R24 are connected with grounded filter capacitors C27 and C28 to perform pi-type matching and 50 ohm impedance matching, and extend out of a common input PORT a of the three-in-one combiner circuit to be connected correspondingly with a shunt diversity PORT a of the low noise amplifier circuit. The shunt diversity ports P1, P2 and P3 of the three-in-one combiner are respectively connected with resistors R21, R22 and R23 in series and extend out of the shunt diversity ports B, C and D of the three-in-one combiner circuit, two ends of the resistor R21 are respectively connected with grounded filter capacitors C21 and C22, two ends of the resistor R22 are respectively connected with grounded filter capacitors C23 and C24, and two ends of the resistor R23 are respectively connected with grounded filter capacitors C25 and C26 to perform pi-type matching to play a role of 50-ohm impedance.
In this embodiment, the 4G LTE module adopts an EC204G module, and the 4G LTE data transceiving function can be realized by matching with a peripheral circuit, and in the present invention, 3 4G LTE modules are correspondingly connected to the branch diversity ports B, C and D of the three-in-one combiner circuit, so as to be suitable for signals of three different frequency bands, and suitable for multi-carrier multi-card aggregation signals.
In this embodiment, the low-noise amplification circuit is powered by a 3.3V dc signal.
In this embodiment, the power supply circuit of the 4G LTE module adopts an LDO chip MIC29302 AWU.
The diversity antenna sends the received radio frequency signal with specific frequency to the low-noise amplifying circuit, and the signal-to-noise ratio of the radio frequency signal is improved under the action of the low-noise amplifying circuit, and can be obtained according to a Shannon formula of a communication principle, and the signal-to-noise ratio directly determines the channel capacity of a channel, namely the data transmission rate, when the channel bandwidth is fixed, so that the improvement of the signal-to-noise ratio can bring obvious improvement of the LTE downlink transmission rate; and finally, the radio frequency signals subjected to the action of the low-noise amplification circuit enter the three-in-one combiner, respectively enter the respective 4G LTE receiving diversity ports and enter the corresponding 4G LTE modules.
According to the circuit for improving the sensitivity of the LTE diversity, disclosed by the invention, the signal-to-noise ratio of a radio frequency signal is improved by adding the low-noise amplification circuit between the diversity antenna and the 4G LTE module, so that the data transmission rate is improved, and the obvious improvement of the downlink transmission rate of the LTE is realized.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (5)
1. A circuit for improving LTE diversity sensitivity is characterized in that: the antenna comprises a diversity antenna, a low-noise amplification circuit, a three-in-one combiner circuit and a 4G LTE module; the receiving end of the diversity antenna is connected with the signal input end of the low-noise amplifying circuit; the signal output end of the low-noise amplifying circuit is connected with the common input end of the three-in-one combiner circuit; the three-in-one combiner circuit comprises three shunt diversity ports, and the shunt diversity ports are respectively connected with receiving diversity ports of the 4G LTE modules matched with the shunt diversity ports.
2. The circuit for improving the LTE diversity sensitivity of claim 1, wherein: the low-noise amplification circuit comprises a low-noise amplifier and a filter circuit, the grounding ports of the low-noise amplifier are respectively and correspondingly grounded, and the radio frequency input port and the radio frequency output port of the low-noise amplifier are respectively connected with the filter circuit in series.
3. The circuit for improving the LTE diversity sensitivity of claim 1, wherein: the three-in-one combiner circuit comprises a three-in-one combiner public end and a shunt port circuit; the three-in-one combiner is connected with the ground port of the three-in-one combiner correspondingly, the common port and the shunt port of the three-in-one combiner are respectively connected with a resistor in series, and two ends of the resistor are respectively connected with a capacitor in parallel.
4. The circuit for improving the LTE diversity sensitivity of claim 1, wherein: the low-noise amplifying circuit is powered by a 3.3V direct-current signal.
5. The circuit for improving the LTE diversity sensitivity of claim 1, wherein: the power supply circuit of the 4G LTE module adopts an LDO chip MIC29302 AWU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910950299.XA CN110808722A (en) | 2019-10-08 | 2019-10-08 | Circuit for improving LTE diversity sensitivity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910950299.XA CN110808722A (en) | 2019-10-08 | 2019-10-08 | Circuit for improving LTE diversity sensitivity |
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| CN110808722A true CN110808722A (en) | 2020-02-18 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020044946A (en) * | 2000-12-07 | 2002-06-19 | 박종섭 | BTS receiver in mobile communication system |
| CN1411299A (en) * | 2001-09-29 | 2003-04-16 | 华为技术有限公司 | Base station receiver and transmitter radio frequency front end |
| US20080182520A1 (en) * | 2007-01-30 | 2008-07-31 | Broadcom Corporation, A California Corporation | Remote low noise amplifier for a reception system and communication device and methods for use therewith |
| CN106100649A (en) * | 2016-08-22 | 2016-11-09 | 宇龙计算机通信科技(深圳)有限公司 | Radio circuit and communication terminal |
| CN106471744A (en) * | 2014-06-23 | 2017-03-01 | 高通股份有限公司 | There is the carrier aggregation diversity antenna module of integrated LNA group |
| CN206533361U (en) * | 2017-02-16 | 2017-09-29 | 南京固邦电子科技有限公司 | One Wire radio-frequency module |
| CN108923867A (en) * | 2018-07-18 | 2018-11-30 | Oppo广东移动通信有限公司 | radio frequency circuit debugging method and related device |
| CN109088665A (en) * | 2018-10-17 | 2018-12-25 | 天津七二通信广播股份有限公司 | A kind of implementation method of the radio frequency amplifier for LTE transmitting diversity |
-
2019
- 2019-10-08 CN CN201910950299.XA patent/CN110808722A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020044946A (en) * | 2000-12-07 | 2002-06-19 | 박종섭 | BTS receiver in mobile communication system |
| CN1411299A (en) * | 2001-09-29 | 2003-04-16 | 华为技术有限公司 | Base station receiver and transmitter radio frequency front end |
| US20080182520A1 (en) * | 2007-01-30 | 2008-07-31 | Broadcom Corporation, A California Corporation | Remote low noise amplifier for a reception system and communication device and methods for use therewith |
| CN106471744A (en) * | 2014-06-23 | 2017-03-01 | 高通股份有限公司 | There is the carrier aggregation diversity antenna module of integrated LNA group |
| CN106100649A (en) * | 2016-08-22 | 2016-11-09 | 宇龙计算机通信科技(深圳)有限公司 | Radio circuit and communication terminal |
| CN206533361U (en) * | 2017-02-16 | 2017-09-29 | 南京固邦电子科技有限公司 | One Wire radio-frequency module |
| CN108923867A (en) * | 2018-07-18 | 2018-11-30 | Oppo广东移动通信有限公司 | radio frequency circuit debugging method and related device |
| CN109088665A (en) * | 2018-10-17 | 2018-12-25 | 天津七二通信广播股份有限公司 | A kind of implementation method of the radio frequency amplifier for LTE transmitting diversity |
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Application publication date: 20200218 |