CN211918575U - FM/AM and GNSS signal transmission circuit and automobile electronic system thereof - Google Patents
FM/AM and GNSS signal transmission circuit and automobile electronic system thereof Download PDFInfo
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- CN211918575U CN211918575U CN201922103118.8U CN201922103118U CN211918575U CN 211918575 U CN211918575 U CN 211918575U CN 201922103118 U CN201922103118 U CN 201922103118U CN 211918575 U CN211918575 U CN 211918575U
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Abstract
The application relates to an FM/AM and GNSS signal transmission circuit and an automobile electronic system thereof, which are applied to the automobile electronic system and comprise a combiner, a splitter and a connecting circuit for connecting the combiner and the splitter, wherein the combiner is at least provided with a first input interface and a second input interface, and the combiner is connected with a first antenna and a second antenna outside through the first input interface and the second input interface; the shunt circuit is at least provided with a first output interface and a second output interface, and the shunt circuit outputs signals to different receiving devices through the first output interface and the second output interface; and the multipath antenna signals received by the combiner are transmitted to the splitter through the connecting line for separation. The beneficial effects are that: the FM/AM antenna signal and the GNSS antenna signal can be transmitted only through one path of radio frequency coaxial line, so that the wiring workload is reduced, and the production efficiency is improved.
Description
Technical Field
The application relates to the technical field of automotive electronics, in particular to an FM/AM and GNSS signal transmission circuit and an automotive electronic system thereof.
Background
With the development trend of automobile intellectualization and interconnection, more and more devices are integrated on the automobile, and Tbox and V2X devices are continuously added on the basis of the traditional radio module and the common navigation module, wherein the common navigation module is also replaced by a high-precision module.
At present, a plurality of high-precision modules in the market adopt a main antenna for positioning and a slave antenna for orientation, so that two external antennas are required to receive global satellite navigation signals. Most of the T-BOX has the LTE communication function, and an LTE system needs two antennas, namely a main collection antenna and a diversity antenna, to receive and transmit signals, so that the signal transmission rate is improved. Traditional radio module adopts double antenna gradually by original single antenna, and double antenna can reduce multipath interference, gives the better sense of hearing of customer and experiences. According to the conventional design, each antenna needs to use one antenna interface independently, so that a set of system with functions of radio reception, LTE communication and high-precision positioning and orientation needs 6 antenna interfaces, and occupies a lot of valuable PCB space.
Disclosure of Invention
In order to solve the technical problems, the application provides an FM/AM and GNSS signal transmission circuit, which is applied to an automotive electronic system and comprises a combiner, a splitter and a connecting circuit for connecting the combiner and the splitter, wherein the combiner is at least provided with a first input interface and a second input interface, and is connected with a first antenna and a second antenna outside through the first input interface and the second input interface; the splitter is at least provided with a first output interface and a second output interface, and the splitter outputs signals to different receiving devices through the first output interface and the second output interface; and the multipath antenna signals received by the combiner are transmitted to the splitter through the connecting line for separation.
Optionally, a first connector and a second connector are respectively disposed at two end portions of the connection line, the first connector is connected to an output end of the combiner, and the second connector is connected to an input end of the splitter.
Optionally, the combiner includes:
the first combining circuit comprises a first inductor, one end of the first inductor is connected with the first antenna through a first input interface, and the other end of the first inductor is connected to the first connector;
and the second combiner circuit comprises a first surface acoustic wave filter and a first capacitor, wherein the input end of the first surface acoustic wave filter is connected with the second antenna through a second input interface, the output end of the first surface acoustic wave filter is connected with one end of the first capacitor, and the other end of the first capacitor is connected on the first connector.
Optionally, the splitter comprises:
the first shunt circuit comprises a second inductor, one end of the second inductor is connected with the second connector, and the second inductor is connected to the first output interface;
and the second shunt circuit comprises a second capacitor and a second sound surface filter, one end of the second capacitor is connected to the first connector, the other end of the second capacitor is connected to the input end of the second sound surface filter, and the output end of the second sound surface filter is connected to the second output interface.
Optionally, the splitter further comprises:
the first power supply circuit comprises a first voltage difference linear voltage stabilizer, a third inductor, a fourth inductor, a fifth inductor and a sixth inductor, wherein the input end of the first voltage difference linear voltage stabilizer is connected with an external power supply, and the output end of the first voltage difference linear voltage stabilizer is connected to the second connector through the third inductor, the fourth inductor, the fifth inductor and the sixth inductor.
Optionally, the combiner further includes:
and the second power supply circuit comprises a second voltage difference linear voltage stabilizer, a seventh inductor, an eighth inductor, a ninth inductor and a tenth inductor, wherein the input end of the second voltage difference linear voltage stabilizer is connected with the first connector through the seventh inductor, the eighth inductor and the ninth inductor, and the output end of the second voltage difference linear voltage stabilizer is connected with the second input interface through the tenth inductor and supplies power to the second antenna.
Optionally, the first antenna is an FM/AM receiving antenna, and the second antenna is a GNSS receiving antenna.
In addition, the application also provides an automobile electronic system which comprises the FM/AM and GNSS signal transmission circuit.
The application discloses FM/AM and GNSS signal transmission circuit and automotive electronics system thereof, its beneficial effect lies in: by arranging the combiner and the splitter, the FM/AM antenna signal and the GNSS antenna signal can be transmitted only through one path of radio frequency coaxial line, so that the wiring workload is reduced, and the production efficiency is improved; the coaxial line is used, so that the installation aperture of the wiring harness at the top of the automobile is reduced, the risks of water leakage and the like are reduced, and the cost of the wiring harness is reduced; at the vehicle-mounted equipment end, the number of radio frequency connectors is reduced, fewer PCB resources are occupied, the system cost is reduced, and the size of the vehicle-mounted equipment is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a signal transmission circuit according to an embodiment of the present application;
fig. 2 is a circuit diagram of a combiner according to an embodiment of the present application;
fig. 3 is a circuit diagram of a splitter according to an embodiment of the present application.
Detailed Description
The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will make the advantages and features of the present application more readily appreciated by those skilled in the art, and thus will more clearly define the scope of the invention.
In the embodiment shown in fig. 1-3, the present application provides an FM/AM and GNSS signal transmission circuit, which is applied in an automotive electronic system, and includes a combiner 1, a splitter 2, and a connection line 3 connecting the combiner 1 and the splitter 2, where the combiner 1 is at least provided with a first input interface and a second input interface, and the combiner is connected with an external first antenna FM/AM and a second antenna GNSS through the first input interface and the second input interface; the shunt is at least provided with a first output interface and a second output interface, and the shunt outputs signals to different receiving devices through the first output interface and the second output interface; the multiple antenna signals received by the combiner 1 are transmitted to the splitter 2 through the connecting line 3 for separation. In this embodiment, the combiner 1 acquires signals from the first antenna FM/AM and the second antenna GNSS, mixes the signals, inputs the signals to the splitter 2 through the connection line 3, and the splitter 2 separates the mixed signals and outputs different signals to different receiving devices. The FM/AM antenna signal and the GNSS antenna signal can be transmitted only through one radio frequency coaxial line, so that the wiring workload is reduced, and the production efficiency is improved; the coaxial line is used, so that the installation aperture of the wiring harness at the top of the automobile is reduced, the risks of water leakage and the like are reduced, and the cost of the wiring harness is reduced; at the vehicle-mounted equipment end, the number of radio frequency connectors is reduced, fewer PCB resources are occupied, the system cost is reduced, and the size of the vehicle-mounted equipment is reduced.
In some embodiments, the two ends of the connection line 3 are respectively provided with a first connector J1 and a second connector J2, the first connector J1 is connected to the output end of the combiner 1, and the second connector J2 is connected to the input end of the splitter 2. The combiner 1 and the splitter 2 are connected through a connecting line 3, in the embodiment, the connecting line 3 is a radio frequency coaxial line, such as an RG-174 coaxial line, and FM/AM antenna signals and GNSS antenna signals can be transmitted only through one radio frequency coaxial line, so that the wiring workload is reduced, and the production efficiency is improved; the coaxial line is used, so that the installation aperture of the wiring harness at the top of the automobile is reduced, the risks of water leakage and the like are reduced, and the cost of the wiring harness is reduced; at the vehicle-mounted equipment end, the number of radio frequency connectors is reduced, fewer PCB resources are occupied, the system cost is reduced, and the size of the vehicle-mounted equipment is reduced.
In some embodiments, the combiner 1 includes: the first combining circuit 11 comprises a first inductor L1, one end of the first inductor L1 is connected with the first antenna FM/AM through a first input interface, and the other end of the first inductor L1 is connected to the first connector J1; the second combining circuit 12 includes a first saw filter U1 and a first capacitor C1, an input end of the first saw filter U1 is connected to the second antenna GNSS through the second input interface, an output end of the first saw filter U1 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the first connector J1. In this embodiment, the signal from the first antenna FM/AM is transmitted to the first connector J1 through the first combining circuit 11, and the signal from the second antenna GNSS is transmitted to the first connector J1 through the second combining circuit 12, wherein the first antenna FM/AM and the second antenna GNSS can be simultaneously transmitted, mixed at the first connector J1, and transmitted to the splitter 2 through the connecting line 3.
In some embodiments, splitter 2 comprises: the first shunt circuit 21 comprises a second inductor L2, one end of the second inductor L2 is connected with the second connector J2, and the second inductor L2 is connected to the first output interface; the second shunt circuit 22 includes a second capacitor C2 and a second SAW filter U2, one end of the second capacitor C2 is connected to the first connector J1, the other end of the second capacitor C2 is connected to the input end of the second SAW filter U2, and the output end of the second SAW filter U2 is connected to the second output interface. The signal transmitted from the second connector J2 is screened out by the first shunt circuit 21 and transmitted to the receiving equipment; the signal from the second connector J2 is filtered by the second shunt circuit 22 and transmitted to the receiving device.
In some embodiments, splitter 2 further comprises: the first power supply circuit comprises a first voltage-difference linear regulator LDO1, a third inductor L3, a fourth inductor L4, a fifth inductor L5 and a sixth inductor L6, wherein the input end of the first voltage-difference linear regulator LDO1 is connected with an external power supply, and the output end of the first voltage-difference linear regulator LDO1 is connected to a second connector J2 through the third inductor L3, the fourth inductor L4, the fifth inductor L5 and the sixth inductor L6. The combiner 1 further includes: the second power supply circuit comprises a second voltage-difference linear regulator LDO2, a seventh inductor L7, an eighth inductor L8, a ninth inductor L9, and a tenth inductor L10, wherein an input end of the second voltage-difference linear regulator LDO2 is connected with the first connector J1 through the seventh inductor L7, the eighth inductor L8, and the ninth inductor L9, and an output end of the second voltage-difference linear regulator LDO2 is connected to the second input interface through the tenth inductor L10 and supplies power to the second antenna GNSS. The first antenna FM/AM is directly powered by the first power supply circuit, and the second antenna GNSS outputs power supply through the second power supply circuit by the power supply output by the first power supply circuit.
In some embodiments, the first antenna FM/AM is an FM/AM receive antenna and the second antenna GNSS is a GNSS receive antenna; the FM/AM receiving antenna is used for receiving vehicle-mounted radio signals, and the GNSS receiving antenna is used for receiving global satellite navigation signals.
In addition, the application also provides an automobile electronic system which comprises the FM/AM and GNSS signal transmission circuit. In some embodiments, the present application provides an FM & AM, GNSS signal mixing and separation scheme comprising a first antenna FM/AM, a second antenna GNSS, a combiner 1, a splitter 2, a connection line 3, a receiving device; the first antenna FM/AM is an FM/AM receiving antenna, and the second antenna GNSS is a GNSS receiving antenna.
Referring to fig. 1, the GNSS receiving antenna and the FM/AM receiving antenna are respectively connected to an input terminal of the combiner 1, and after mixing the received FM/AM signal and the GNSS signal, the signals are output through the combiner 1, and an output terminal of the combiner 1 is connected to a first connector J1, and is connected to an FM/AM and GNSS shared antenna interface of the vehicle-mounted device terminal by using a connection line 3. The splitter 2 is connected with the rear stage of the shared antenna interface, the rear stage of the splitter 2 is provided with a GNSS module radio frequency front end circuit and a radio frequency front end circuit, and after the mixed signal reaches the shared antenna interface, the FM & AM and GNSS signals are respectively extracted through the splitter 2 and are sent to the corresponding module radio frequency front end. The front end of the radio frequency of the FM/AM module is provided with a band-pass filter for filtering out-of-band signals; the GNSS module radio frequency front end is provided with an impedance matching circuit for adjusting load impedance.
Referring to fig. 2, the combiner 1 includes a first saw filter U1, a first inductor L1, and a first capacitor C1.
The FM/AM receiving antenna is connected in series with a first inductor L1, wherein the first inductor L1 requires a resonant frequency above 2.5G with a Q value of at least 25. By utilizing the amplitude-frequency characteristic of the inductor, the impedance of the inductor is particularly large in a high-frequency range, so that the GNSS signal can be prevented from shunting to enter the FM/AM receiving antenna. The GNSS receiving antenna is connected with the first surface acoustic wave filter U1 and the first capacitor C1 in series, wherein the first surface acoustic wave filter U1 requires that the isolation degree of reverse transmission of FM/AM signals reaches over 40dB, the FM/AM signals are prevented from shunting to enter the GNSS receiving antenna, and the high-frequency capacitor C1 requires that the resonant frequency falls within a GNSS frequency band for isolating direct current signals. The FM/AM and GNSS signals are mixed at the connector J1 after passing through the first inductor L1, the first saw filter U1 and the first capacitor C1, respectively.
Referring to fig. 3, the splitter 2 includes a second SAW U2, a second inductor L2, and a second capacitor C2.
The FM/AM signal extraction is composed of a second inductor L2, wherein the second inductor L2 requires the Q value of above 2.5G to be minimum 25, and is connected with the radio frequency front end in series, when the mixed signal reaches the second inductor L2, the amplitude-frequency characteristic of the second inductor L2 is utilized, the inductance impedance is particularly large in a high frequency range, and the GNSS signal can be prevented from passing through; the inductance impedance is very low in the low frequency band, and FM/AM signals can be smoothly passed through.
The GNSS signal extraction consists of a second SAW filter U2 and a second capacitor C2, wherein the second capacitor C2 requires that the resonance frequency fall within the GNSS frequency band for dc blocking signals. The second capacitor C2 is connected in series with the second SAW U2; the isolation degree of the second SAW filter U2 to the FM/AM signal is required to reach more than 40dB, and the signal outside the GNSS band is prevented from passing through, so that the GNSS signal can be successfully extracted.
In this application implementation case, GNSS antenna and FM/AM antenna are active antenna, and the mobile unit end has supply circuit, uses first pressure difference linear regulator LDO1 to establish ties with third inductance L3, fourth inductance L4, fifth inductance L5 and sixth inductance L6, supplies power for the antenna through the coaxial line. The power supply range of the FM/AM antenna is 9V-12V, and the power supply range of the GNSS antenna is 3.3V-5V, so that the GNSS antenna needs to be connected with a second voltage difference linear regulator LDO2 in series by using a seventh inductor L7, an eighth inductor L8 and a ninth inductor L9, and supplies power to the active GNSS antenna through a tenth inductor L10.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.
Claims (8)
1. An FM/AM and GNSS signal transmission circuit is applied to an automobile electronic system and is characterized by comprising a combiner (1), a splitter (2) and a connecting circuit (3) for connecting the combiner (1) and the splitter (2), wherein the combiner (1) is at least provided with a first input interface and a second input interface, and the combiner (1) is connected with an external first antenna (FM/AM) and a second antenna (GNSS) through the first input interface and the second input interface; the shunt (2) is at least provided with a first output interface and a second output interface, and the shunt (2) outputs signals to different receiving devices through the first output interface and the second output interface; the multipath antenna signals received by the combiner (1) are transmitted to the branching unit (2) through the connecting line (3) for separation.
2. An FM/AM and GNSS signal transmission circuit according to claim 1, characterized in that the two ends of the connection line (3) are respectively provided with a first connector (J1) and a second connector (J2), the first connector (J1) is connected to the output terminal of the combiner (1), and the second connector (J2) is connected to the input terminal of the splitter (2).
3. FM/AM and GNSS signal transmission circuit according to claim 2, characterized in that said combiner (1) comprises:
the first combining circuit (11) comprises a first inductor (L1), one end of the first inductor (L1) is connected with a first antenna (FM/AM) through a first input interface, and the other end of the first inductor (L1) is connected to the first connector (J1);
the second combining circuit (12) comprises a first surface acoustic wave filter (U1) and a first capacitor (C1), wherein the input end of the first surface acoustic wave filter (U1) is connected with a second antenna (GNSS) through a second input interface, the output end of the first surface acoustic wave filter (U1) is connected to one end of the first capacitor (C1), and the other end of the first capacitor (C1) is connected to the first connector (J1).
4. FM/AM and GNSS signal transmission circuit according to claim 2, characterized in that the splitter (2) comprises:
a first shunt circuit (21) comprising a second inductor (L2), wherein one end of the second inductor (L2) is connected to the second connector (J2), and the second inductor (L2) is connected to the first output interface;
and the second shunt circuit (22) comprises a second capacitor (C2) and a second sound surface filter (U2), one end of the second capacitor (C2) is connected to the first connector (J1), the other end of the second capacitor (C2) is connected to the input end of the second sound surface filter (U2), and the output end of the second sound surface filter (U2) is connected to the second output interface.
5. FM/AM and GNSS signal transmission circuit according to claim 2, characterized in that the splitter (2) further comprises:
first power supply circuit, including first pressure difference linear regulator (LDO1), third inductance (L3), fourth inductance (L4), fifth inductance (L5) and sixth inductance (L6), the input and the external power supply of first pressure difference linear regulator (LDO1) are connected, the output of first pressure difference linear regulator (LDO1) passes through third inductance (L3), fourth inductance (L4), fifth inductance (L5), sixth inductance (L6) are connected on second connector (J2).
6. FM/AM and GNSS signal transmission circuit according to claim 5, characterized in that said combiner (1) further comprises:
the second power supply circuit comprises a second voltage difference linear regulator (LDO2), a seventh inductor (L7), an eighth inductor (L8), a ninth inductor (L9) and a tenth inductor (L10), wherein the input end of the second voltage difference linear regulator (LDO2) is connected with the first connector (J1) through the seventh inductor (L7), the eighth inductor (L8) and the ninth inductor (L9), and the output end of the second voltage difference linear regulator (LDO2) is connected with the second input interface through the tenth inductor (L10) and supplies power for the second antenna (GNSS).
7. FM/AM and GNSS signal transmission circuit according to claim 1, characterized in that the first antenna (FM/AM) is an FM/AM receiving antenna and the second antenna (GNSS) is a GNSS receiving antenna.
8. An automotive electronics system comprising an FM/AM and GNSS signal transmission circuit according to any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922103118.8U CN211918575U (en) | 2019-11-29 | 2019-11-29 | FM/AM and GNSS signal transmission circuit and automobile electronic system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922103118.8U CN211918575U (en) | 2019-11-29 | 2019-11-29 | FM/AM and GNSS signal transmission circuit and automobile electronic system thereof |
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| CN211918575U true CN211918575U (en) | 2020-11-13 |
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| CN201922103118.8U Active CN211918575U (en) | 2019-11-29 | 2019-11-29 | FM/AM and GNSS signal transmission circuit and automobile electronic system thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112929038A (en) * | 2021-02-09 | 2021-06-08 | 北斗星通智联科技有限责任公司 | Vehicle-mounted radio frequency device, system and automobile |
| CN114142874A (en) * | 2021-12-29 | 2022-03-04 | 广州极飞科技股份有限公司 | Signal transmission system, electronic equipment and unmanned aerial vehicle |
| CN114639948A (en) * | 2022-03-21 | 2022-06-17 | 智道网联科技(北京)有限公司 | Antenna for V2X device, V2X device and vehicle |
| CN114142874B (en) * | 2021-12-29 | 2024-11-15 | 广州极飞科技股份有限公司 | Signal transmission system, electronic equipment and unmanned aerial vehicle |
-
2019
- 2019-11-29 CN CN201922103118.8U patent/CN211918575U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112929038A (en) * | 2021-02-09 | 2021-06-08 | 北斗星通智联科技有限责任公司 | Vehicle-mounted radio frequency device, system and automobile |
| CN114142874A (en) * | 2021-12-29 | 2022-03-04 | 广州极飞科技股份有限公司 | Signal transmission system, electronic equipment and unmanned aerial vehicle |
| CN114142874B (en) * | 2021-12-29 | 2024-11-15 | 广州极飞科技股份有限公司 | Signal transmission system, electronic equipment and unmanned aerial vehicle |
| CN114639948A (en) * | 2022-03-21 | 2022-06-17 | 智道网联科技(北京)有限公司 | Antenna for V2X device, V2X device and vehicle |
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