Radio frequency circuit, antenna signal amplifier and vehicle

Abstract

The utility model discloses a radio frequency circuit, an antenna signal amplifier and a vehicle. The radio frequency circuit comprises an amplitude modulation circuit and a frequency modulation circuit. The amplitude modulation circuit comprises an amplitude modulation filter circuit, and the amplitude modulation filter circuit is connected with the antenna and the signal output end; the frequency modulation circuit comprises an amplification circuit, a matching circuit and a frequency modulation filter circuit, the first end of the amplification circuit is connected with the antenna, the second end of the amplification circuit is connected with the first end of the matching circuit, the second end of the matching circuit is connected with the first end of the frequency modulation filter circuit, and the second end of the frequency modulation filter circuit is connected with the signal output end. The radio frequency circuit is simple in structure, the circuit structure is simplified, the manufacturing cost is reduced, the amplitude modulation circuit part does not need an amplifying circuit, and a filtering signal containing an amplitude modulation frequency band can be obtained through the amplitude modulation filtering circuit.

Description

Technical Field

[0001] The present application relates to the field of automotive electronic technology, and more specifically to a radio frequency circuit, an antenna signal amplifier and a vehicle. Background Art

[0002] The vehicle antenna amplifier is a communication device that processes the signal received by the vehicle antenna and transmits it to the vehicle receiver. However, the antenna amplifier in the related art has the problems of high cost and complex circuit structure. Utility Model Content

[0003] The present utility model is proposed to solve at least one of the above problems. According to the first aspect of the present application, a radio frequency circuit is provided, including: an amplitude modulation circuit and a frequency modulation circuit; the amplitude modulation circuit includes an amplitude modulation filter circuit, and the amplitude modulation filter circuit is connected to an antenna and a signal output terminal; the frequency modulation circuit includes an amplifier circuit, a matching circuit and a frequency modulation filter circuit, the first end of the amplifier circuit is connected to the antenna, the second end of the amplifier circuit is connected to the first end of the matching circuit, the second end of the matching circuit is connected to the first end of the frequency modulation filter circuit, and the second end of the frequency modulation filter circuit is connected to the signal output terminal.

[0004] In one embodiment of the present application, the amplifier circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, an amplifier tube, a first capacitor and a second capacitor; wherein the first resistor and the second resistor are connected in series between a preset power supply and ground, the third resistor, the amplifier tube and the fourth resistor are connected in series between the preset power supply and ground, the input end of the amplifier tube is connected between the first resistor and the second resistor, the antenna is connected between the first resistor and the second resistor, the first end of the first capacitor is connected to the preset power supply, the second end of the first capacitor is grounded, the first end of the second capacitor is connected between the amplifier tube and the fourth resistor, and the second end of the second capacitor is grounded.

[0005] In one embodiment of the present application, the matching circuit includes: a third capacitor, a fourth capacitor and a first inductor; wherein, the first end of the third capacitor is connected to the amplifying circuit, the second end of the third capacitor is respectively connected to the first end of the fourth capacitor and the first end of the first inductor, the second end of the fourth capacitor is grounded, and the second end of the first inductor is connected to the FM filter circuit.

[0006] In one embodiment of the present application, the FM filter circuit includes: a fifth capacitor, a sixth capacitor and a second inductor; wherein the first end of the fifth capacitor is connected to the matching circuit, the second end of the fifth capacitor is respectively connected to the first end of the second inductor and the first end of the sixth capacitor, the second end of the second inductor is grounded, and the second end of the sixth capacitor is connected to the signal output end.

[0007] In one embodiment of the present application, the amplitude modulation filter circuit includes: a third inductor, a fourth inductor and a seventh capacitor; wherein the first end of the third inductor is connected to the antenna, the second end of the third inductor is respectively connected to the first end of the seventh capacitor and the first end of the fourth inductor, and the second end of the fourth inductor is connected to the signal output end.

[0008] In one embodiment of the present application, the amplitude modulation circuit further includes: a first isolated DC circuit connected between the amplitude modulation filter circuit and the signal output terminal.

[0009] In one embodiment of the present application, the amplitude modulation circuit further includes: a second isolated DC circuit connected between the amplitude modulation filter circuit and the antenna.

[0010] In one embodiment of the present application, the frequency modulation circuit further includes: a third isolated DC circuit connected between the amplifying circuit and the antenna.

[0011] According to a second aspect of the present application, an antenna amplifier is provided, comprising: the above-mentioned radio frequency circuit.

[0012] According to a third aspect of the present application, a vehicle is provided, comprising: the above-mentioned antenna amplifier.

[0013] According to the RF circuit, antenna amplifier and vehicle provided in the embodiments of the present application, the RF circuit structure of the present application is simple, the circuit structure is simplified, the manufacturing cost is reduced, and the amplitude modulation circuit part does not require an amplification circuit. Through the amplitude modulation filter circuit, a filtered signal containing an amplitude modulation frequency band can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A schematic diagram of the structure of a radio frequency circuit provided in one embodiment of the utility model;

[0016] Figure 2 This is a circuit schematic diagram of a radio frequency circuit according to an embodiment of the present utility model;

[0017] Figure 3 A schematic diagram of the structure of a radio frequency circuit provided by another embodiment of the utility model;

[0018] Figure 4 A schematic diagram of the gain simulation result of the AM band of the utility model;

[0019] Figure 5 A schematic diagram of the gain simulation result of the frequency modulation band of the utility model;

[0020] Figure 6 A schematic diagram of the noise coefficient simulation results of the frequency modulation band of the utility model;

[0021] Figure 7 A schematic diagram of the structure of an antenna amplifier provided in one embodiment of the utility model;

[0022] Figure 8 A schematic structural diagram of a vehicle provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more obvious, the exemplary embodiments according to the utility model will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments of the utility model, and it should be understood that the utility model is not limited to the exemplary embodiments described here. Based on the embodiments of the utility model described in the utility model, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the utility model.

[0024] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0025] It should be understood that the utility model can be implemented in different forms and should not be interpreted as being limited to the embodiments proposed herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

[0026] In order to thoroughly understand the present invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0027] The performance of the AM&FM antenna amplifier circuit in the related technology will be redundant and not cost-effective. The AM&FM antenna amplifier circuit needs to work in two frequency bands, one is the AM (Amplitude Modulation) band, and the other is the FM (Frequency Modulation) band. The center frequency of the AM band is around 1MHz, and the bandwidth is also around 1MHz. This band belongs to the edge of the low frequency band of the radio frequency. The propagation path of the signal in this frequency band and the propagation path of the signal in the FM band are both radio frequency lines, including microstrip lines and coaxial lines. Because the AM signal belongs to the low frequency band, the attenuation in the entire radio frequency line is very small, so an AM amplifier is unnecessary.

[0028] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0029] The present application provides a radio frequency circuit, such as Figure 1 As shown, the radio frequency circuit 100 includes: an amplitude modulation circuit 1001 and a frequency modulation circuit 1002 .

[0030] The AM circuit 1001 includes an AM filter circuit 10011 , which is connected to the antenna 200 and the signal output terminal 300 .

[0031] It should be noted that the AM filter circuit 10011 is configured to perform AM filtering on the RF signal received by the antenna 200 to obtain a filtered signal containing an AM frequency band, and output the filtered signal containing the AM frequency band to the signal output terminal 300 .

[0032] As an example, the amplitude modulation filter circuit 10011 may be a third-order LC filter circuit.

[0033] The FM circuit 1002 includes an amplifier circuit 10021, a FM filter circuit 10022 and a matching circuit 10023. The first end of the amplifier circuit 10021 is connected to the antenna 200, the second end of the amplifier circuit 10021 is connected to the first end of the matching circuit 10023, the second end of the matching circuit 10023 is connected to the first end of the FM filter circuit 10022, and the second end of the FM filter circuit 10022 is connected to the signal output end 300.

[0034] It should be noted that, in the frequency modulation circuit 1002, when the signal output by the amplifier circuit 10021 is transmitted to the frequency modulation filter circuit 10022, if the impedance between the two is not matched, it will cause signal reflection, thereby causing power loss and degradation of signal quality. Therefore, the matching circuit 10023 is configured to match the impedance between the amplifier circuit 10021 and the frequency modulation filter circuit 10022.

[0035] Specifically, the amplifier circuit 10021 is configured to amplify the radio frequency signal received by the antenna 200 to obtain an amplified signal. The FM filter circuit 10022 is configured to perform FM filtering on the amplified signal to obtain a filtered signal containing an FM frequency band, and output the filtered signal containing the FM frequency band to the signal output terminal 300.

[0036] It is worth mentioning that the RF circuit 100 of the present application uses a single antenna design, that is, one antenna 200 includes two working frequency bands, and the amplitude modulation circuit 1001 and the frequency modulation circuit 1002 are connected to the same antenna 200.

[0037] As an example, the signal output terminal 300 can be connected to a demodulator, which performs processes such as filtering noise and demodulating the received filtered signals containing an amplitude modulation frequency band and a filtered signal containing a frequency modulation frequency band to obtain corresponding digital signals. These digital signals can be recognized and processed by a computer, a microprocessor or other digital device to realize data communication, storage or application.

[0038] The radio frequency circuit 100 of the embodiment of the utility model has a simple structure, and the amplitude modulation circuit 1001 part does not need an amplifier circuit, which simplifies the circuit structure. Through the amplitude modulation filter circuit 10011, a filtered signal containing an amplitude modulation frequency band can be obtained. At the same time, the radio frequency circuit 100 of the present application does not need to use a transformer and a chip with high cost and complex functions, which reduces the manufacturing cost of the radio frequency circuit 100 and saves resources. The radio frequency circuit 100 of the present application can process amplitude modulation signals and frequency modulation signals at the same time. This makes the radio frequency circuit 100 more adaptable and can cope with different types of signal transmission requirements. By setting a matching circuit 10023 between the amplifier circuit 10021 and the frequency modulation filter circuit 10022, it is possible to reduce reflection loss, optimize signal transmission efficiency and improve the overall performance of the circuit.

[0039] It should be noted that, compared with the AM&FM antenna amplifier circuit in the related art, the present application does not need an FM filter close to the AM&FM antenna port. This is because although a part of the AM signal enters the amplifier circuit 10021, the amplifier circuit 10021 is still in a high impedance state for the AM signal, and the main AM signal still passes through the amplitude modulation circuit 1001, so there is no need to use the FM filter. As for the amplified AM signal in the FM signal, it will be filtered out by the frequency modulation filter circuit 10022 behind the amplifier circuit 10021.

[0040] In some embodiments, Figure 2 As shown, the amplifier circuit 10021 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, an amplifier tube Q1, a first capacitor C1 and a second capacitor C2; wherein, the first resistor R1 and the second resistor R2 are connected in series between a preset power supply VCC and ground, the third resistor R3, the amplifier tube Q1 and the fourth resistor R4 are connected in series between the preset power supply VCC and ground, the input end of the amplifier tube Q1 is connected between the first resistor R1 and the second resistor R2, the antenna 200 is connected between the first resistor R1 and the second resistor R2, the first end of the first capacitor C1 is connected to the preset power supply VCC, the second end of the first capacitor C1 is grounded, the first end of the second capacitor C2 is connected between the amplifier tube Q1 and the fourth resistor R4, and the second end of the second capacitor C2 is grounded.

[0041] Specifically, the matching circuit 10023 includes: a third capacitor C3, a fourth capacitor C4 and a first inductor L1; wherein the first end of the third capacitor C3 is connected between the amplifier tube Q1 and the third resistor R3, the second end of the third capacitor C3 is respectively connected to the first end of the fourth capacitor C4 and the first end of the first inductor L1, and the second end of the fourth capacitor C4 is grounded.

[0042] More specifically, the FM filter circuit 10022 includes: a fifth capacitor C5, a sixth capacitor C6 and a second inductor L2; wherein, the first end of the fifth capacitor C5 is connected to the second end of the first inductor L1, the second end of the fifth capacitor C5 is respectively connected to the first end of the second inductor L2 and the first end of the sixth capacitor C6, and the second end of the second inductor L2 is grounded.

[0043] More specifically, the AM filter circuit 10011 includes: a third inductor L3, a fourth inductor L4 and a seventh capacitor C7; wherein the first end of the third inductor L3 is connected to the antenna 200, and the second end of the third inductor L3 is respectively connected to the first end of the seventh capacitor C7 and the first end of the fourth inductor L4.

[0044] In this embodiment, the components of the amplifier circuit 10021, the matching circuit 10023, the FM filter circuit 10022 and the AM filter circuit 10011 and their connection relationships are relatively simple, which reduces the manufacturing cost. At the same time, the function of each component is clear, making circuit maintenance and troubleshooting relatively easy.

[0045] In some embodiments, Figure 3 As shown, the amplitude modulation circuit 1001 further includes: a first isolated DC circuit 10012 connected between the amplitude modulation filter circuit 10011 and the signal output terminal 300 .

[0046] It should be noted that, since the signal output terminal 300 may be connected to a circuit with a power supply, current may enter the amplitude modulation filter circuit 10011, which may have an adverse effect on the amplitude modulation filter circuit 10011. Therefore, the first isolation DC circuit 10012 is configured to isolate the DC signal in the circuit.

[0047] As an example, Figure 2 As shown, the first isolated DC circuit 10012 includes: an eighth capacitor C8; wherein a first end of the eighth capacitor C8 is connected to a second end of the fourth inductor L4, and a second end of the eighth capacitor C8 is connected to the signal output terminal 300.

[0048] In this embodiment, by providing the first isolated DC circuit 10012, it is possible to improve signal quality, extend the service life of the circuit, and improve system reliability.

[0049] In some embodiments, Figure 3 As shown, the amplitude modulation circuit 1001 further includes: a second isolation DC circuit 10013 connected between the amplitude modulation filter circuit 10011 and the antenna 200 .

[0050] It should be noted that the signal received by the antenna 200 may contain DC components, which may damage the subsequent amplitude modulation filter circuit 10011. Therefore, the second DC isolation circuit 10013 is configured to isolate the DC signal in the RF signal.

[0051] As an example, Figure 2 As shown, the second isolated DC circuit 10013 includes: a ninth capacitor C9; wherein a first end of the ninth capacitor C9 is connected to the antenna 200, and a second end of the ninth capacitor C9 is connected to a first end of the third inductor L3.

[0052] In this embodiment, by providing the second DC isolation circuit 10013, the DC signal in the RF signal can be effectively isolated, thereby improving the reliability and stability of the entire circuit.

[0053] In some embodiments, Figure 3 As shown, the frequency modulation circuit 1002 further includes: a third isolated DC circuit 10024 connected between the amplifying circuit 10021 and the antenna 200 .

[0054] It should be noted that the signal received by the antenna 200 may contain DC components, which may damage the subsequent FM filter circuit 10022. Therefore, the third DC isolation circuit 10024 is configured to isolate the DC signal in the RF signal.

[0055] As an example, Figure 2 As shown, the third isolated DC circuit 10024 includes: a tenth capacitor C10; wherein a first end of the tenth capacitor C10 is connected to the antenna 200, and a second end of the tenth capacitor C10 is connected between the first resistor R1 and the second resistor R2.

[0056] In this embodiment, by providing the third DC isolation circuit 10024, the DC signal in the RF signal can be effectively isolated, thereby improving the reliability and stability of the entire circuit.

[0057] Next, see Figure 4-6 , illustrating the simulation results of the RF circuit 100 of the present application.

[0058] Figure 4 is the gain simulation result of the AM band. Figure 4 It can be obtained that: m1 = -0.063, m2 = -0.049, so the amplitude modulation circuit in the radio frequency circuit 100 of the present application has good gain stability.

[0059] Figure 5 is the gain simulation result of the FM band. Figure 5 It can be obtained that: m3=4.998, m4=5.078, so the frequency modulation circuit in the radio frequency circuit 100 of the present application has good gain stability.

[0060] Figure 6 is the noise figure simulation result of the FM band. Figure 6 It can be obtained that: m5=1.798, m6=1.715, so the radio frequency circuit 100 of the present application has good noise performance.

[0061] In addition, the present application also provides an antenna signal amplifier, such as Figure 7 As shown, the antenna signal amplifier 10 includes: the above-mentioned radio frequency circuit 100.

[0062] The antenna signal amplifier 10 of the embodiment of the utility model can reduce the manufacturing cost by providing the radio frequency circuit 100, and the amplitude modulation circuit 1001 part does not need the amplification circuit 10021, and the filtered signal including the amplitude modulation frequency band can be obtained through the amplitude modulation filter circuit 10011.

[0063] In addition, the present application also provides a vehicle, such as Figure 8 As shown, the vehicle 1 includes: the antenna signal amplifier 10 mentioned above.

[0064] The vehicle 1 according to the embodiment of the utility model is provided with the antenna signal amplifier 10 , so that the manufacturing cost of the whole vehicle can be reduced.

[0065] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0066] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a functional division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0067] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known structures and technologies are not shown in detail so as not to obscure the understanding of this description.

[0068] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various utility model aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. The claimed application requires more features than those explicitly stated in each claim. More specifically, as reflected in the corresponding claims, its utility model point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0069] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including accompanying claims, abstracts and drawings) and all units of any device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0070] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0071] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present application may be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0072] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A radio frequency circuit, characterized in that: include: AM circuit, FM circuit; The amplitude modulation circuit includes an amplitude modulation filter circuit, and the amplitude modulation filter circuit is connected to the antenna and the signal output terminal; The FM circuit includes an amplifier circuit, a matching circuit and a FM filter circuit. The first end of the amplifier circuit is connected to the antenna, the second end of the amplifier circuit is connected to the first end of the matching circuit, the second end of the matching circuit is connected to the first end of the FM filter circuit, and the second end of the FM filter circuit is connected to the signal output end.

2. The radio frequency circuit according to claim 1, characterized in that: The amplifying circuit comprises: a first resistor, a second resistor, a third resistor, a fourth resistor, an amplifying tube, a first capacitor and a second capacitor; Among them, the first resistor and the second resistor are connected in series between a preset power supply and ground, the third resistor, the amplifier tube and the fourth resistor are connected in series between the preset power supply and ground, the input end of the amplifier tube is connected between the first resistor and the second resistor, the antenna is connected between the first resistor and the second resistor, the first end of the first capacitor is connected to the preset power supply, the second end of the first capacitor is grounded, the first end of the second capacitor is connected between the amplifier tube and the fourth resistor, and the second end of the second capacitor is grounded.

3. The radio frequency circuit according to claim 1, characterized in that: The matching circuit comprises: a third capacitor, a fourth capacitor and a first inductor; Among them, the first end of the third capacitor is connected to the amplifier circuit, the second end of the third capacitor is respectively connected to the first end of the fourth capacitor and the first end of the first inductor, the second end of the fourth capacitor is grounded, and the second end of the first inductor is connected to the FM filter circuit.

4. The radio frequency circuit according to claim 1, characterized in that: The frequency modulation filter circuit comprises: a fifth capacitor, a sixth capacitor and a second inductor; Among them, the first end of the fifth capacitor is connected to the matching circuit, the second end of the fifth capacitor is respectively connected to the first end of the second inductor and the first end of the sixth capacitor, the second end of the second inductor is grounded, and the second end of the sixth capacitor is connected to the signal output end.

5. The radio frequency circuit according to claim 1, characterized in that: The amplitude modulation filter circuit comprises: a third inductor, a fourth inductor and a seventh capacitor; The first end of the third inductor is connected to the antenna, the second end of the third inductor is respectively connected to the first end of the seventh capacitor and the first end of the fourth inductor, and the second end of the fourth inductor is connected to the signal output end.

6. The radio frequency circuit according to claim 1, characterized in that: The amplitude modulation circuit further includes: a first isolated direct current circuit connected between the amplitude modulation filter circuit and the signal output terminal.

7. The radio frequency circuit according to claim 1, characterized in that: The amplitude modulation circuit also includes: a second isolated direct current circuit connected between the amplitude modulation filter circuit and the antenna.

8. The radio frequency circuit according to claim 1, characterized in that: The frequency modulation circuit also includes: a third isolated DC circuit connected between the amplifying circuit and the antenna.

9. An antenna signal amplifier, characterized in that: include: A radio frequency circuit as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: include: The antenna signal amplifier as claimed in claim 9.

Images