CN112039540A - Circuit for reducing interference of main radio frequency to GPS - Google Patents
Circuit for reducing interference of main radio frequency to GPS Download PDFInfo
- Publication number
- CN112039540A CN112039540A CN202010733071.8A CN202010733071A CN112039540A CN 112039540 A CN112039540 A CN 112039540A CN 202010733071 A CN202010733071 A CN 202010733071A CN 112039540 A CN112039540 A CN 112039540A
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- Prior art keywords
- gps
- radio frequency
- amplifier
- interference
- pass filter
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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
-
- 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
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
-
- 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
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B2001/1045—Adjacent-channel interference
Abstract
The invention provides a circuit for reducing the interference of main radio frequency to GPS, comprising: the radio frequency transceiver is sequentially connected with a first amplifier, a duplexer, a first low-pass filter, an ASM switch and a tuning switch, the tuning switch is connected with a main antenna, the radio frequency transceiver is further connected with a logic circuit, the logic circuit is connected with the tuning switch, the logic circuit is further respectively connected with a GPS receiver and a second amplifier, the GPS receiver is sequentially connected with a second amplifier, an SAW filter and a second low-pass filter, and the second low-pass filter is connected with the GPS antenna. The interference is eliminated in real time by using a hardware circuit mode, and no time delay exists. And the control mode can be dynamically adjusted according to the product interference condition. The invention only improves the interference frequency band, does not influence the working state of other frequency bands, can reduce the interference of the main radio frequency to the GPS, improves the APGS performance, enables the mobile phone positioning to be faster and more accurate, and solves the problem of inaccurate mobile phone positioning under weak signals.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a circuit for reducing interference of a main radio frequency to a GPS.
Background
At present, the mobile phone main radio frequency also works when AGPS works, and the main radio frequency signal can generate interference to a GPS signal when being transmitted in high power, so that the AGPS performance is reduced. Especially the second harmonic of Band13/14 falls directly into the GPS reception Band, directly affecting GPS reception. The AGPS coexistence interference problem is a general challenge in current handset design. The existing solutions are to add a filter in the main rf path to reduce the interference of the main rf to the GPS. However, the addition of the filter cannot completely eliminate interference, and different GPS receiving platforms have different demodulation capabilities, which increases the requirement on the isolation between the filter and the antenna, making the design of the mobile phone more difficult. When the main radio frequency B13/14 transmits, the second harmonic signal interferes with GPS receiving through antenna coupling mode, only the main transmitting frequency band is concerned and the harmonic point isolation is not concerned when the B13/14 antenna is designed, and the traditional method for solving the interference is to add a filter on the radio frequency path.
In summary, there is a need for a method for solving the above-mentioned technical problem, which can eliminate the interference in real time by using a hardware circuit manner without delay. And the control mode can be dynamically adjusted according to the product interference condition. The invention only improves the interference frequency band, does not influence the working state of other frequency bands, can reduce the interference of the main radio frequency to the GPS, improves the APGS performance, enables the mobile phone positioning to be faster and more accurate, and solves the problem of inaccurate mobile phone positioning under weak signals, thereby overcoming the problems.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention provides a circuit for reducing the interference of a main radio frequency to a GPS, and aims to solve the problems that the main radio frequency signal in the prior art interferes with the GPS signal when being transmitted at high power, and the mobile phone is not accurately positioned.
In order to achieve the purpose, the invention adopts the following technical scheme:
a circuit for reducing interference from a primary radio frequency to a GPS, comprising: the radio frequency transceiver is sequentially connected with a first amplifier, a duplexer, a first low-pass filter, an ASM switch and a tuning switch, the tuning switch is connected with a main antenna, the radio frequency transceiver is further connected with a logic circuit, the logic circuit is connected with the tuning switch, the logic circuit is further respectively connected with a GPS receiver and a second amplifier, the GPS receiver is sequentially connected with the second amplifier, an SAW filter and a second low-pass filter, and the second low-pass filter is connected with the GPS antenna.
Preferably, the first amplifier is a PA amplifier and the second amplifier is an LNA amplifier.
Preferably, the first low-pass filter and the second low-pass filter are of the type RFLPF1005040YM1T 76.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a circuit for reducing interference of main radio frequency to GPS, which is characterized by comprising: the radio frequency transceiver is sequentially connected with a first amplifier, a duplexer, a first low-pass filter, an ASM switch and a tuning switch, the tuning switch is connected with a main antenna, the radio frequency transceiver is further connected with a logic circuit, the logic circuit is connected with the tuning switch, the logic circuit is further respectively connected with a GPS receiver and a second amplifier, the GPS receiver is sequentially connected with the second amplifier, an SAW filter and a second low-pass filter, and the second low-pass filter is connected with the GPS antenna. The interference is eliminated in real time by using a hardware circuit mode, and no time delay exists. And the control mode can be dynamically adjusted according to the product interference condition. The invention only improves the interference frequency band, does not influence the working state of other frequency bands, can reduce the interference of the main radio frequency to the GPS, improves the APGS performance, enables the mobile phone positioning to be faster and more accurate, and solves the problem of inaccurate mobile phone positioning under weak signals.
Drawings
FIG. 1 is a block diagram of the circuit of the present invention.
Reference numerals:
10. radio frequency transceiver 20, first amplifier 30, duplexer 40, first low pass filter 50, ASM switch 60, tuning switch 70, logic 80.GPS receiver 90, second amplifier 100, SAW filter 110, and second low pass filter.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the circuit for reducing interference of a main radio frequency to a GPS provided by the present invention is characterized by comprising: the radio frequency transceiver 10, the radio frequency transceiver 10 connects with first amplifier 20, duplexer 30, first low pass filter 40, ASM switch 50 and tuning switch 60 in proper order, the tuning switch 60 is connected with the main antenna, the radio frequency transceiver 10 is further connected with a logic circuit 70, the logic circuit 70 is connected with the tuning switch 60, the logic circuit 70 is further connected with GPS receiver 80 and second amplifier 90 respectively, the GPS receiver 80 connects with the second amplifier 90, SAW filter 100, second low pass filter 110 in proper order, the second low pass filter 110 is connected with the GPS antenna.
It should be noted that, according to the theory of GPS reception, when the GPS signal is not interfered, the main RF needs to satisfy P ≦ -174dbm/hz in the GPS band. And P ═ PAout-DPXatt-LPFatt + ASM-ANTiso. Where PAout is the output signal power, DPXiso represents the duplexer 30 rejection, LPFatt represents the filter rejection, ASM represents the switching gain, and anti represents the antenna isolation. PAout, DPXatt, LPFatt and ASM are all common devices in the industry, and after the typical value is substituted, P is-84-45-32 +5-ANTiso is less than or equal to-174. Therefore, the isolation between the antennas needs to be more than 15, and the antenna isolation in the current mobile phone design is difficult to guarantee. The invention utilizes the combined action of the GPS receiving circuit control signal and the antenna tunnel control signal to increase the isolation between the antennas so as to reduce the interference of the main radio frequency to the GPS.
Specifically, the GPS receiving circuit adds a second amplifier 90, and when the GPS is in operation, the second amplifier 90 needs to be controlled to operate by an amplifier EN enable signal of the GPS, so that when the signal is enabled, the GPS is represented to be in operation. The tuning switch 60 is arranged at the main radio frequency antenna port on the circuit design of the mobile phone, and the antenna gain is changed in a tuning mode. The tuning switch 60 also needs to be controlled by an enable signal, i.e. the signal enables indicates that the main rf is working. The GPS control signal and the antenna tunnel control signal are processed through the logic circuit 70, when the GPS is receiving, if the main interfering radio frequency is transmitted, the output logic is changed, and the antenna tunnel is controlled to change the gain and isolation of the antenna in the interference frequency band, so that the interference is effectively reduced.
In some embodiments, the first amplifier 20 is a PA amplifier and the second amplifier 90 is an LNA amplifier.
In some embodiments, the first low pass filter 40 and the second low pass filter 110 are of the type RFLPF1005040YM1T 76.
In summary, the working principle of the invention is as follows:
the invention provides a circuit for reducing interference of main radio frequency to GPS, which is characterized by comprising: the radio frequency transceiver 10, the radio frequency transceiver 10 connects with first amplifier 20, duplexer 30, first low pass filter 40, ASM switch 50 and tuning switch 60 in proper order, the tuning switch 60 is connected with the main antenna, the radio frequency transceiver 10 is further connected with a logic circuit 70, the logic circuit 70 is connected with the tuning switch 60, the logic circuit 70 is further connected with GPS receiver 80 and second amplifier 90 respectively, the GPS receiver 80 connects with the second amplifier 90, SAW filter 100, second low pass filter 110 in proper order, the second low pass filter 110 is connected with the GPS antenna. The interference is eliminated in real time by using a hardware circuit mode, and no time delay exists. And the control mode can be dynamically adjusted according to the product interference condition. The invention only improves the interference frequency band, does not influence the working state of other frequency bands, can reduce the interference of the main radio frequency to the GPS, improves the APGS performance, enables the mobile phone positioning to be faster and more accurate, and solves the problem of inaccurate mobile phone positioning under weak signals.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (3)
1. A circuit for reducing interference from a primary radio frequency to a GPS, comprising: the radio frequency transceiver is sequentially connected with a first amplifier, a duplexer, a first low-pass filter, an ASM switch and a tuning switch, the tuning switch is connected with a main antenna, the radio frequency transceiver is further connected with a logic circuit, the logic circuit is connected with the tuning switch, the logic circuit is further respectively connected with a GPS receiver and a second amplifier, the GPS receiver is sequentially connected with the second amplifier, an SAW filter and a second low-pass filter, and the second low-pass filter is connected with the GPS antenna.
2. The circuit for reducing main radio frequency to GPS interference of claim 1, wherein the first amplifier is a PA amplifier and the second amplifier is an LNA amplifier.
3. The circuit for reducing main radio frequency to GPS interference according to claim 1, wherein the first low pass filter and the second low pass filter are RFLPF1005040YM1T 76.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010733071.8A CN112039540A (en) | 2020-07-27 | 2020-07-27 | Circuit for reducing interference of main radio frequency to GPS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010733071.8A CN112039540A (en) | 2020-07-27 | 2020-07-27 | Circuit for reducing interference of main radio frequency to GPS |
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| CN112039540A true CN112039540A (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010733071.8A Pending CN112039540A (en) | 2020-07-27 | 2020-07-27 | Circuit for reducing interference of main radio frequency to GPS |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1783735A (en) * | 2004-11-23 | 2006-06-07 | Lg电子株式会社 | Mobile communication terminal and signal receiving method thereof |
| CN102271002A (en) * | 2010-06-03 | 2011-12-07 | 美国博通公司 | Radio front end and circuit |
| CN109149071A (en) * | 2018-08-20 | 2019-01-04 | 瑞声光电科技(常州)有限公司 | Antenna modules and mobile terminal |
| US10292111B1 (en) * | 2018-03-14 | 2019-05-14 | Corning Optical Communications LLC | Gain control circuit supporting dynamic gain control in a remote unit in a wireless distribution system (WDS) |
| CN210246743U (en) * | 2019-01-31 | 2020-04-03 | 维沃移动通信有限公司 | Radio frequency control circuit and mobile terminal |
| CN111029732A (en) * | 2019-12-31 | 2020-04-17 | 上海摩勤智能技术有限公司 | Antenna device and handheld communication equipment |
| CN111342231A (en) * | 2020-02-27 | 2020-06-26 | 北京字节跳动网络技术有限公司 | Method and device for adjusting isolation between antennas, electronic equipment and medium |
-
2020
- 2020-07-27 CN CN202010733071.8A patent/CN112039540A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1783735A (en) * | 2004-11-23 | 2006-06-07 | Lg电子株式会社 | Mobile communication terminal and signal receiving method thereof |
| CN102271002A (en) * | 2010-06-03 | 2011-12-07 | 美国博通公司 | Radio front end and circuit |
| US10292111B1 (en) * | 2018-03-14 | 2019-05-14 | Corning Optical Communications LLC | Gain control circuit supporting dynamic gain control in a remote unit in a wireless distribution system (WDS) |
| CN109149071A (en) * | 2018-08-20 | 2019-01-04 | 瑞声光电科技(常州)有限公司 | Antenna modules and mobile terminal |
| CN210246743U (en) * | 2019-01-31 | 2020-04-03 | 维沃移动通信有限公司 | Radio frequency control circuit and mobile terminal |
| CN111029732A (en) * | 2019-12-31 | 2020-04-17 | 上海摩勤智能技术有限公司 | Antenna device and handheld communication equipment |
| CN111342231A (en) * | 2020-02-27 | 2020-06-26 | 北京字节跳动网络技术有限公司 | Method and device for adjusting isolation between antennas, electronic equipment and medium |
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Application publication date: 20201204 |