CN107835034B - Radio frequency device and mobile terminal for solving sensitivity degradation of GPS - Google Patents
Radio frequency device and mobile terminal for solving sensitivity degradation of GPS Download PDFInfo
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- CN107835034B CN107835034B CN201710945843.2A CN201710945843A CN107835034B CN 107835034 B CN107835034 B CN 107835034B CN 201710945843 A CN201710945843 A CN 201710945843A CN 107835034 B CN107835034 B CN 107835034B
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- H—ELECTRICITY
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- 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
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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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
- H04B1/38—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
- H04B1/3805—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 with built-in auxiliary receivers
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Abstract
The invention discloses a radio frequency device and a mobile terminal for solving the problem of GPS sensitivity deterioration. The filter is arranged between the front-end radio frequency switch and the device generating harmonic interference, so that the harmonic interference can be filtered out, and the problem of the sensitivity degradation of the GPS is solved.
Description
Technical Field
The invention relates to the technical field of radio frequency, in particular to a radio frequency device and a mobile terminal for solving the problem of GPS sensitivity deterioration.
Background
The GPS is a short name for a global positioning system, is originally applied only to the military field, and is currently widely applied to many industries such as transportation, surveying and mapping. In foreign countries, the GPS has been widely applied to public transportation, subways, private cars and other aspects, and at present, the application of the domestic GPS is still in the bud state, but the development momentum is strong. The mobile phone GPS navigation becomes the mainstream of traffic equipment such as taxi taking and self-driving, and the positioning accuracy becomes the factor of the intuitive experience of the user. However, the sensitivity of the GPS itself is relatively high (-150dBm or so), and if there is an interfering signal in the GPS band, it is easy to interfere with the performance of the GPS. Therefore, how to reduce the GPS sensitivity degradation (sensitivity degradation) caused by internal interference is a major subject of radio frequency nowadays.
Root cause of GPS sensitivity degradation is diverse, but basically radiated interference causes de-sense. For example, when the lcd (liquid Crystal display) is on screen, the radiation interference of FPC (flexible circuit board) or driver IC (chip), the radiation interference of GSM1800/WB2 (WCDMA Band 2) main wave, the interference of B13/14 (Band 13/14, frequency Band) second harmonic wave, etc. In the early stage of project design, the main radio frequency architecture is focused, and in the aspect of GPS, the antenna scheme can be determined only according to the TIS requirement, and the potential risk of GPS sensitivity deterioration is ignored.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The present invention is directed to provide a radio frequency device and a mobile terminal for solving the above-mentioned problem of the prior art, and aims to reduce the problem of GPS sensitivity degradation (i.e., GPS De-sense) caused by interference in the conventional radio frequency device.
The technical scheme adopted by the invention for reducing the technical problem is as follows:
a radio frequency device for solving the sensitivity degradation of a GPS comprises a device for generating harmonic interference, a front end radio frequency switch which is positioned on the same path with the device, and a filter which is arranged between the front end radio frequency switch and the device and is used for filtering the harmonic interference.
In the radio frequency device for solving the sensitivity degradation of the GPS, the device is a duplexer, and the radio frequency device comprises a main set antenna, a front end radio frequency switch, a filter for filtering harmonic interference, a low pass filter, a first duplexer, a second duplexer, a multi-mode multi-frequency power amplifier and a transceiver;
the main antenna is connected with the selection end of the front end radio frequency switch, one transmission end of the front end radio frequency switch is connected with one end of the filter, the other transmission end of the front end radio frequency switch is connected with the common end of the second duplexer, the receiving end of the second duplexer is connected with the PRX7 pin of the transceiver, the transmitting end of the second duplexer is connected with the MB3 pin of the multi-mode multi-frequency power amplifier, the other end of the filter is connected with one end of the low-pass filter, the other end of the low-pass filter is connected with the receiving end of the first duplexer, the common end of the first duplexer is connected with the PRX1 pin of the transceiver, and the transmitting end of the first duplexer is connected with the LB2 pin of the multi-mode multi-frequency power.
In the radio frequency device for solving the GPS sensitivity degradation, the first duplexer is a B13 duplexer or a B14 duplexer, and the filter is a notch filter for filtering B13/B14 second harmonic interference.
In the radio frequency device for solving the sensitivity degradation of the GPS, the notch filter comprises a capacitor and an inductor, one end of the capacitor is connected with one transmission end of the front-end radio frequency switch and one end of the low-pass filter, and the other end of the capacitor is grounded through the inductor.
In the radio frequency device for solving the problem of the GPS sensitivity deterioration, the center frequency point of the notch filter is 1.575 GHz.
In the radio frequency device for solving the problem of the GPS sensitivity deterioration, the capacitance value of the capacitor is 2pf, and the inductance value of the inductor is 5.1 nH.
In the radio frequency device for solving the sensitivity degradation of the GPS, the device is a duplexer, and the radio frequency device comprises a main set antenna, a front end radio frequency switch, a filter for filtering harmonic interference, a low pass filter, a first duplexer, a second duplexer, a multi-mode multi-frequency power amplifier and a transceiver;
the main antenna is connected with the selection end of the front end radio frequency switch, one transmission end of the front end radio frequency switch is connected with one end of the filter, one transmission end of the front end radio frequency switch is connected with one end of the low pass filter, the other transmission end of the front end radio frequency switch is connected with the common end of the second duplexer in an RF2 mode, the receiving end of the second duplexer is connected with a PRX7 pin of the transceiver, the transmitting end of the second duplexer is connected with an MB3 pin of the multi-mode multi-frequency power amplifier, the other end of the low pass filter is connected with one end of the filter, the other end of the filter is connected with the receiving end of the first duplexer, the common end of the first duplexer is connected with a PRX1 pin of the transceiver, and the transmitting end of the first duplexer is connected with an LB2 pin of the multi.
In the radio frequency device for solving the sensitivity degradation of the GPS, the notch filter comprises a capacitor and an inductor, one end of the capacitor is connected with the other end of the low-pass filter and the receiving end of the first duplexer, and the other end of the capacitor is grounded through the inductor.
A mobile terminal comprises the radio frequency device for solving the GPS sensitivity deterioration.
Compared with the prior art, the radio frequency device and the mobile terminal for solving the problem of the sensitivity degradation of the GPS disclosed by the invention comprise a device for generating harmonic interference, a front end radio frequency switch which is positioned on the same path with the device, and a filter which is arranged between the front end radio frequency switch and the device and is used for filtering the harmonic interference. The filter is arranged between the front-end radio frequency switch and the device generating harmonic interference, so that the harmonic interference can be filtered out, and the problem of GPS sensitivity degradation (namely GPS De-sense) is solved.
Drawings
Fig. 1 is a schematic diagram of a conventional rf device.
Fig. 2 is a schematic diagram of a first embodiment of the radio frequency device for solving the GPS sensitivity degradation according to the present invention.
FIG. 3 is a diagram of a filter in an embodiment of a radio frequency device for resolving GPS sensitivity degradation provided by the present invention.
Fig. 4 is a schematic diagram of a second embodiment of the radio frequency device for solving the GPS sensitivity degradation according to the present invention.
Fig. 5 is a schematic diagram of a filter in a second embodiment of the radio frequency apparatus for solving the GPS sensitivity degradation provided by the present invention.
Detailed Description
The invention provides a radio frequency device and a mobile terminal for solving the problem of GPS (global positioning system) De-sense by filtering harmonic interference. In order to make the objects, technical solutions and advantages 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.
The present embodiment is described by taking the example that the B13 (Band 13) harmonic causes the GPS de-sense of the mobile phone, please refer to the conventional radio frequency device shown in fig. 1 (only the devices related to the present embodiment are shown, and the radio frequency device further includes other devices or modules, which are prior art and not described in detail herein). The frequency of the GPS is 1.57542GHz, the second harmonic range of B13 is (1.554, 1.574), and the receiving frequency of the GPS is just in the range. Similarly, the second harmonic frequency of LTE (Long Term Evolution) B14 also covers the frequency point of GPS.
In order to attenuate the interference of the B13 second harmonic to the GPS, the prior art typically adds a Low Pass Filter (LPF) in the B13 path to ensure that the B13 harmonic signal is attenuated as much as possible before being radiated from the main set antenna, so that the energy coupled to the GPS antenna is relatively reduced.
In fig. 1, a GPS antenna 1, a notch filter 2, a first GPS filter 3, a Low Noise Amplifier (LNA) 4 of the GPS, and a second GPS filter 5 (which is connected to a four-in-one chip terminal of the GPS, which is a conventional technique) are sequentially provided on a GPS path (a path shorter at the upper side in the figure). The main-set path is connected with the transceiver, and is provided with: a main set antenna 6, a switch (switch) 7, a Low Pass Filter (LPF) 8, a first duplexer 9, a second duplexer 10, and a multi-mode multi-band power amplifier (MMPA). The isolation between the GPS antenna and the main set antenna is greater than 30dB (the black double arrow in the figure indicates the isolation). The existing components with attenuation effect on the B13 second harmonic signal include MMPA, duplexer, low pass filter, frequency divider or antenna isolation, however, the B13 second harmonic signal and the GPS signal are of the same frequency, so the GPS filter (filter) has no attenuation effect on the signal, and only part of the path attenuation is reduced.
The component characteristics that affect the B13 second harmonic are shown in table 1.
TABLE 1
The GPS interference level of the four-in-one chip end of the GPS can be approximately estimated through the attenuation coefficient of each component on the path. Conditions are as follows: assuming that the thermal Noise level is-173 dBm/Hz, the Noise figure of the GPS LNA (Low Noise Amplifier) is 0.7dB and the gain is 10 dB. In addition, because the user's handshake will change the characteristics of the antenna, the mobile phone will use an antenna switching mechanism at present, that is, the main diversity path is switched to the upper antenna, the diversity path is switched to the lower antenna, and at this time, the transmitting antenna of B13 will be close to the GPS antenna, and the isolation may be only about ten and several dB (the calculation is based on 15 dB).
The B13 second harmonic power at the main collector antenna end is:
P_harmonic_1=(-13-60)-45-32-25=-175dBm/Hz；
the power leaked to the front end of the GPS LNA is:
P_harmonic_2 =-175-15-1.5=-191.5dBm/Hz；
the total noise level is:
P_interference=(-191.5dBm/Hz)+(-175dBm/Hz+0.7)=-174.2dBm/Hz;
the thermal noise increased by 0.1dB relative to the thermal noise of-174.3 dBm/Hz (-175+0.7), which is only 0.1dB of de-sense.
If the item has a carrier aggregation requirement, a frequency divider is added before the switch (switch 7), and one more device for suppressing the B13 is added on the whole path. If the item has no carrier aggregation requirement, the frequency divider at the front end of the switch is deleted (the circuit is shown in fig. 1), and the interference level P of the whole path needs to be recalculated as follows:
P_harmonic_1=(-13-60)-45-32=-150dBm/Hz ，
P_harmonic_2=-150-15-1.5=--166.5dBm/Hz，
P_interference=(-166.5dBm/Hz)+(-175dBm/Hz+0.7)=-166.2dBm/Hz。
compared with-174.3 dBm/Hz noise floor, 8.1dB de-sense is generated, thus the positioning accuracy of the GPS is seriously influenced.
To this end, the present implementation improves GPS performance by adding a device for suppressing the B13 second harmonic. The increase of devices aims at solving the problem of the GPS de-sense and saving the research and development cost. The radio frequency device for solving the sensitivity degradation of the GPS comprises a device for generating harmonic interference, a front end radio frequency switch and a filter, wherein the front end radio frequency switch and the device are positioned on the same path, and the filter is arranged between the front end radio frequency switch and the device and is used for filtering the harmonic interference. If the interference of a certain device is to be filtered, a filter for filtering harmonic interference is added to a path where the device is located. Since the rf section does not have the requirement of carrier aggregation, the front-end rf switch has only one common path, and therefore, a filter cannot be added to the antenna common, otherwise the intermediate frequency signal is suppressed to some extent. If the front end rf switch of phase3 (an rf architecture) is used, a filter may be added to the common end of the low frequency output, between the front end rf switch and the device.
The device is exemplified by a duplexer of B13 or B14, and B13/14 second harmonic interference needs to be filtered. As shown in fig. 2, in a specific embodiment, the rf device includes a main set antenna 10, a front end rf switch 20, a filter 30 for filtering harmonic interference, a low pass filter 40, a first duplexer 50, a second duplexer 60, a multi-mode multi-band power amplifier 70 (model QM 56022), and a transceiver 80 (model MT 6177). The main antenna 10 is connected to the selection terminal RFC of the front end RF switch 20, one transmission terminal RF1 of the front end RF switch 20 is connected to one end of the filter 30, the other transmission terminal RF2 of the front end RF switch 20 is connected to the common terminal 1 of the second duplexer 60, the receiving terminal 2 of the second duplexer 60 is connected to the PRX7 pin of the transceiver 80, the transmitting terminal 3 of the second duplexer 60 is connected to the MB3 pin of the multi-mode multi-frequency power amplifier 70, the other end of the filter 30 is connected to one end of the low-pass filter 40, the other end of the low-pass filter 40 is connected to the receiving terminal 2 of the first duplexer 50, the common terminal 1 of the first duplexer 50 is connected to the PRX1 pin of the transceiver 80, and the transmitting terminal 3 of the first duplexer 50 is connected to the LB2 pin of the multi-mode multi-frequency power amplifier 70.
It is to be understood that the main set antenna 10, the front end rf switch 20, the low pass filter 40, the first duplexer 50, the second duplexer 60, the multi-mode multi-band power amplifier 70 and the transceiver 80 are conventional technologies, and the functions thereof will not be described in detail herein.
In this embodiment, the first duplexer 50 is a B13 duplexer or a B14 duplexer, the filter 30 is a notch filter (notch filter) for filtering B13/B14 second harmonic interference, and the second duplexer 60 is a B2 duplexer or a B25 duplexer. In specific implementation, as shown in fig. 3, the notch filter includes a capacitor C and an inductor L, one end of the capacitor C is connected to one end of the low-pass filter 40 and one end of the RF transmission terminal RF1 of the front-end RF switch 20, and the other end of the capacitor C is grounded through the inductor L. The notch filter is used for filtering the interference of B13/B14 second harmonic waves to GPS frequency, and the central frequency point of the notch filter needs to be set to be 1.575 GHz.
According to the formula
L =5.1nH and C =2pf were obtained. The attenuation of the notch filter at the moment can be close to 20dB at the GPS frequency point. Thus, the method can be usedApproximate calculation:
P_harmonic_1=(-13-60)-45-32-20=-170dBm/Hz;
P_harmonic_2=-170-15-1.5=-186.5dBm/Hz
P_interference=-186.5+(-175+0.7)=-174.1dBm/Hz
there is a 0.2dB increase over the previous thermal noise level, and the GPS De-sense may only be 0.2dB, approximately negligible.
Although the addition of the notch filter brings about 0.5dB insertion loss, since the low frequency channel difference loss is low and the linearity of the B13 PA (power amplifier) itself is not poor, the TX (transmission)/RX (reception) performance of the B13 is not greatly affected.
The rf device shown in fig. 2 is a non-carrier aggregation architecture, and the notch filter is disposed between the first duplexer 50 and the front-end rf switch 20. Since the low pass filter 40 is further disposed between the first duplexer 50 and the front end rf switch 20, the notch filter may be located at the left (shown in fig. 2) or the right (shown in fig. 4) of the low pass filter 40.
In the second embodiment, the rf device includes a main antenna 10, a front-end rf switch 20, and a filter 30 for filtering harmonic interference/A low pass filter 40, a first duplexer 50, a second duplexer 60, a multi-mode multi-band power amplifier 70, and a transceiver 80. The main antenna 10 is connected to the selection end RFC of the front end RF switch 20, one transmission end RF1 of the front end RF switch 20 is connected to one end of the low pass filter 40, the other transmission end RF2 of the front end RF switch 20 is connected to the common end 1 of the second duplexer 60, the receiving end 2 of the second duplexer 60 is connected to the PRX7 pin of the transceiver 80, the transmitting end 3 of the second duplexer 60 is connected to the MB3 pin of the multi-mode multi-band power amplifier 70, and the other end of the low pass filter 40 is connected to the filter 30/ Filter 30, filter 30/The other end of the first duplexer 50 is connected to the receiving end 2 of the first duplexer 50, the common end 1 of the first duplexer 50 is connected to the PRX1 pin of the transceiver 80, and the transmitting end 3 of the first duplexer 50 is connected to the LB2 pin of the multi-mode multi-band power amplifier 70.
Correspondingly, as shown in fig. 5, the notch filter includes a capacitor C1 and an inductor L1, one end of the capacitor C1 is connected to the other end of the low pass filter 40 and the receiving terminal 2 of the first duplexer 50, and the other end of the capacitor C1 is grounded through the inductor L1.
Based on the radio frequency device for solving the problem of the GPS sensitivity degradation, the invention also provides a mobile terminal which comprises the radio frequency device.
In conclusion, the notch filter is arranged between the front-end radio frequency switch and the B13 duplexer or the B14 duplexer, so that the B13/B14 second harmonic interference can be filtered, the performance of the GPS is improved, and the problem of the GPS De-sense is solved; compared with other filters, the notch filter has a simple structure and is lower in cost.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (7)
1. A radio frequency device for solving the sensitivity degradation of a GPS is characterized by comprising a device for generating harmonic interference, a front end radio frequency switch which is positioned on the same path with the device, and a filter which is arranged between the front end radio frequency switch and the device and is used for filtering B13/B14 second harmonic interference; a low-pass filter is also arranged between the device and the front-end radio frequency switch, and the filter is positioned on the left side or the right side of the low-pass filter;
the device is a duplexer, and the radio frequency device comprises a main antenna, a front end radio frequency switch, a filter for filtering harmonic interference, a low-pass filter, a first duplexer, a second duplexer, a multi-mode multi-frequency power amplifier and a transceiver;
the main set antenna is connected with a selection end of the front end radio frequency switch, one transmission end of the front end radio frequency switch is connected with one end of the low-pass filter, the other transmission end of the front end radio frequency switch is connected with a common end of the second duplexer, a receiving end of the second duplexer is connected with the transceiver, a transmitting end of the second duplexer is connected with the multi-mode multi-frequency power amplifier, the other end of the low-pass filter is connected with one end of the filter, the other end of the filter is connected with a receiving end of the first duplexer, the common end of the first duplexer is connected with the transceiver, and the transmitting end of the first duplexer is connected with the multi-mode multi-frequency power amplifier;
GPSDe-sense has 0.2 dB.
2. The radio frequency device for resolving GPS sensitivity degradation of claim 1, wherein the first duplexer is a B13 duplexer or a B14 duplexer, and the filter is a notch filter for filtering B13/B14 second harmonic interference.
3. The radio frequency device for solving the sensitivity degradation of the GPS as claimed in claim 2, wherein the notch filter includes a capacitor and an inductor, one end of the capacitor is connected to one end of the low pass filter and one end of the front end radio frequency switch, and the other end of the capacitor is grounded through the inductor.
4. The radio frequency apparatus for solving GPS sensitivity degradation according to claim 3, wherein the notch filter has a center frequency of 1.575 GHz.
5. The radio frequency device for solving the sensitivity degradation of the GPS according to claim 4, wherein the capacitance value of the capacitor is 2pf, and the inductance value of the inductor is 5.1 nH.
6. The radio frequency device for solving the GPS sensitivity degradation as claimed in claim 2, wherein the notch filter includes a capacitor and an inductor, one end of the capacitor is connected to the other end of the low pass filter and the receiving end of the first duplexer, and the other end of the capacitor is grounded via the inductor.
7. A mobile terminal characterized by comprising a radio frequency device for resolving GPS sensitivity degradation according to any one of claims 1 to 6.
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| CN109889281B (en) * | 2019-03-27 | 2021-09-28 | 深圳前海达闼云端智能科技有限公司 | Antenna detection device |
| CN111865352B (en) * | 2019-04-24 | 2022-07-15 | 株式会社村田制作所 | High-frequency signal transmitting/receiving circuit and high-frequency signal transmitting/receiving device |
| CN110224707A (en) | 2019-05-31 | 2019-09-10 | 惠州Tcl移动通信有限公司 | A kind of suppression circuit and intelligent terminal of band14 signal |
| CN110855315A (en) * | 2019-12-05 | 2020-02-28 | 惠州Tcl移动通信有限公司 | Radio frequency architecture and mobile terminal |
| CN111082814A (en) * | 2019-12-13 | 2020-04-28 | 惠州Tcl移动通信有限公司 | Method and device for downlink signal transmission in dual-connection architecture, and terminal |
| CN111244633B (en) * | 2020-03-23 | 2021-07-06 | 维沃移动通信有限公司 | Antenna device and electronic apparatus |
| CN111654902B (en) * | 2020-06-02 | 2024-01-19 | Tcl通讯（宁波）有限公司 | Method and device for reducing GPS signal interference of mobile terminal and mobile terminal |
| CN113765536A (en) * | 2021-08-23 | 2021-12-07 | 展讯通信（深圳）有限公司 | Radio frequency circuit and radio frequency signal transmission method |
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| CN203135865U (en) * | 2013-03-20 | 2013-08-14 | 东莞宇龙通信科技有限公司 | Mobile terminal for alleviating interference of LTE (Long Term Evolution) emission in GPS (Global Position System) |
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