Communication circuit and circuit board

Abstract

The utility model provides a communication circuit and a circuit board. The communication circuit comprises a radio communication module and a positioning communication module. And the positioning communication module is connected with the power supply. The radio communication module is used for receiving a radio signal and carrying out impedance matching and bandwidth adjustment on the radio signal so as to output a target radio signal; and the positioning communication module is used for receiving a satellite signal and performing amplification, filtering and impedance matching on the satellite signal when the power supply is powered on so as to output a target satellite signal. The radio communication function and the positioning communication function are integrated in one circuit, and the circuit is simplified.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of electronic circuit, in particular to a communication circuit and a circuit board. BACKGROUND

[0002] In the field of automobiles today, the vehicle-mounted multimedia host has become a standard, and its rich functions bring many conveniences and entertainment experiences to the driver and passengers. The smooth implementation of all this cannot be achieved without the support of the rear signal receiving antenna and related components.

[0003] Many scenarios require the vehicle-mounted multimedia system to have both radio and positioning functions. The traditional way may require two independent circuits to process radio and positioning communication, which will occupy more space. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the present application provides a communication circuit and a circuit board, which solves the problem that multiple circuits are needed to realize radio and positioning functions in the past, resulting in large device size and complex circuit, and simplifies the circuit.

[0005] In a first aspect, the embodiment of the present application provides a communication circuit, which comprises a radio communication module and a positioning communication module; the positioning communication module is connected with a power supply; the radio communication module is used for receiving a radio signal and performing impedance matching and bandwidth adjustment on the radio signal to output a target radio signal; the positioning communication module is used for receiving a satellite signal and performing amplification, filtering and impedance matching on the satellite signal to output a target satellite signal when the power supply is powered on.

[0006] In some embodiments, the radio communication module comprises a radio receiving unit, a radio impedance matching unit and a radio output matching unit; the radio receiving unit, the radio impedance matching unit and the radio output matching unit are connected in sequence; the radio receiving unit is used for receiving the radio signal; the radio impedance matching unit is used for performing impedance matching on the radio signal; and the radio output matching unit is used for adjusting the bandwidth and the standing wave ratio of the radio signal after impedance matching to output the target radio signal.

[0007] In some embodiments, the radio receiving unit comprises a spring antenna, a capacitor C7 and an inductor L3; the spring antenna is connected with a first end of the capacitor C7 and a first end of the inductor L3, a second end of the inductor L3 is grounded, and a second end of the capacitor C7 is connected with the radio impedance matching unit; wherein the spring antenna is used for receiving the radio signal.

[0008] In some embodiments, the radio receiving unit comprises a resistor R7, a resistor R8, and a resistor R9; a first end of the resistor R7 and a first end of the resistor R8 are connected with the radio receiving unit, a second end of the resistor R7 is grounded, a second end of the resistor R8 and a first end of the resistor R9 are connected with the radio output matching unit, and a second end of the resistor R9 is grounded.

[0009] In some embodiments, the radio output matching unit comprises a resistor R10, a capacitor C8, and an inductor L4; a first end of the inductor L4 and a first end of the capacitor C8 are connected with the radio impedance matching unit, a second end of the inductor L4 is grounded, a second end of the capacitor C8 and a first end of the resistor R10 are connected, and a second end of the resistor R10 is grounded; wherein the second end of the capacitor C8 is used for outputting the target radio signal.

[0010] In some embodiments, the positioning communication module comprises a power supply unit, an amplification filtering unit, and a positioning impedance matching unit; the power supply unit is connected with the power supply and the amplification filtering unit respectively, and the amplification filtering unit is connected with the positioning impedance matching unit; the power supply unit is used for acquiring electric energy to power the amplification filtering unit when the power supply is powered on; the amplification filtering unit is used for receiving the satellite signal and amplifying and filtering the satellite signal; and the positioning impedance matching unit is used for impedance matching the amplified and filtered satellite signal to output the target satellite signal.

[0011] In some embodiments, the positioning impedance matching unit comprises a resistor R4, a resistor R5, and a resistor R6; a first end of the resistor R4 is connected with the amplification filtering unit and a first end of the resistor R5, a second end of the resistor R4 is grounded, a second end of the resistor R5 is connected with a first end of the resistor R6, and a second end of the resistor R6 is grounded; wherein the second end of the resistor R5 is used for outputting the target satellite signal.

[0012] In some embodiments, the power supply unit comprises a resistor R2 and an inductor L2; a first end of the inductor L2 is connected with the power supply, a second end of the inductor L2 is connected with a first end of the resistor R2, and a second end of the resistor R2 is connected with the amplification filtering unit.

[0013] In some embodiments, the positioning communication module further comprises a capacitor C3 and a capacitor C5; a first end of the capacitor C5 is connected with the amplification filtering unit, a second end of the capacitor C5 is connected with the positioning impedance matching unit, a first end of the capacitor C3 is connected with the positioning impedance matching unit, and a second end of the capacitor C3 is used for outputting the target satellite signal.

[0014] In a second aspect, the embodiment of the present application provides a circuit board, which comprises a first ground wire and the communication circuit as described above; the first ground wire is connected with the radio communication module of the communication circuit; wherein the first ground wire is wrapped around the outer ring of the circuit board.

[0015] Different from the prior art, the embodiment of the present application provides a communication circuit and a circuit board. The communication circuit comprises a radio communication module and a positioning communication module; the positioning communication module is connected with a power supply; the radio communication module is used for receiving a radio signal and performing impedance matching and bandwidth adjustment on the radio signal to output a target radio signal; the positioning communication module is used for receiving a satellite signal and performing amplification, filtering and impedance matching on the satellite signal to output a target satellite signal when the power supply is powered on. The communication circuit and the circuit board provided by the embodiment of the present application integrate the radio communication and the positioning communication functions in one circuit, solve the problem that a plurality of independent circuits are needed to realize the radio and the positioning functions respectively in the prior art, resulting in a large device size and a complex circuit, and simplify the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and not intended to be limiting of the embodiments, and in which like reference numerals designate similar items in the figures, in which:

[0017] Figure 1 is a structural block diagram of a communication circuit provided by the embodiment of the present application;

[0018] Figure 2 is a structural block diagram of a radio communication module provided by the embodiment of the present application;

[0019] Figure 3 is a circuit structural diagram of the radio communication module provided by the embodiment of the present application;

[0020] Figure 4 is a structural block diagram of a positioning communication module provided by the embodiment of the present application;

[0021] Figure 5 is a circuit structural diagram of the positioning communication module provided by the embodiment of the present application;

[0022] Figure 6 is a structural diagram of a circuit board provided by the embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and detailed description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain and not limit the present application.

[0024] The technical features involved in the various embodiments of the present application described below can be combined with each other without conflict and can be combined with each other.

[0025] When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements can be present therebetween.

[0026] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more.

[0027] Please refer to Figure 1 , Figure 1 is a structural block diagram of a communication circuit 100 provided by an embodiment of the present application.

[0028] The embodiment of the present application provides a communication circuit 100, which comprises a radio communication module 11 and a positioning communication module 12. Wherein, the positioning communication module 12 is connected with a power supply 200.

[0029] Specifically, the radio communication module 11 is used for receiving a radio signal and performing impedance matching and bandwidth adjustment on the radio signal to output a target radio signal. The positioning communication module 12 is used for receiving a satellite signal and performing amplification, filtering and impedance matching on the satellite signal to output a target satellite signal when the power supply 200 is powered on.

[0030] Wherein, the radio signal is an AM(Amplitude Modulation, amplitude modulation) signal and / or an FM(Frequency Modulation, frequency modulation) signal. They are two signal modulation methods for radio broadcasting, which realize wireless transmission of voice information by loading audio information onto a high-frequency carrier signal.

[0031] The target radio signal is a signal obtained by processing the received radio signal (AM signal and / or FM signal) by the radio communication module 11.

[0032] The satellite signal is a GPS (Global Positioning System) signal and / or a BD (BeiDou Navigation Satellite System) signal.

[0033] The target satellite signal is a signal obtained by the positioning communication module 12 after processing the received satellite signal (GPS signal and / or BD signal) after the power supply is powered on.

[0034] In practical applications, the working principle of the radio communication module 11 is as follows:

[0035] Firstly, the antenna of the radio communication module 11 is responsible for receiving radio signals in the surrounding environment, which include AM (Amplitude Modulation) signals and / or FM (Frequency Modulation) signals. The radio station transmits audio information by modulating and loading it onto a high-frequency carrier signal of the corresponding frequency band. After the antenna senses these electromagnetic wave signals, it converts them into electrical signals and transmits them into the radio communication module 11.

[0036] Next, when the signal enters the radio communication module 11, impedance matching is performed first. This is because the signal source (broadcasting station transmitting antenna) has its own output impedance, while the radio communication module 11 has an input impedance. If the impedances of the two are not matched, the signal will be reflected during transmission, resulting in signal loss and distortion. By adding appropriate inductors, capacitors, and other components to form an impedance matching network, the input impedance of the radio communication module 11 is adjusted to match the output impedance of the signal source, ensuring that the radio signal can be transmitted to the module interior to the greatest extent for subsequent processing.

[0037] Then, since there are various frequencies of electromagnetic signals in the surrounding environment, in order to filter out the required radio signal and suppress interference signals, bandwidth adjustment needs to be performed by the radio communication module 11. The signal after bandwidth adjustment is the target radio signal, which can be more effectively processed by the subsequent demodulation circuit to restore the audio signal.

[0038] The working principle of the positioning communication module 12 is as follows:

[0039] Firstly, when the power supply 200 is powered on, the antenna of the positioning communication module 12 begins to receive satellite signals. The satellite signals include GPS (Global Positioning System) signals and / or BD (BeiDou Navigation Satellite System) signals. These satellite signals propagate in space in the form of radio frequency signals. After the antenna receives these satellite signals, it transmits them to the interior of the positioning communication module 12.

[0040] Next, since the satellite signal is transmitted from a satellite far away from the earth, the signal strength is very weak after long distance transmission. In order to facilitate the subsequent circuit to effectively process the signal, the satellite signal needs to be amplified first. At this time, the positioning communication module 12 amplifies the satellite signal.

[0041] At the same time, in the space environment, there are various electromagnetic interference signals. In order to obtain relatively pure satellite signals, filtering is needed. Thus, the satellite signals of the target frequency band (the frequency band required by the user) are passed, and the interference signals of other frequency bands, such as other wireless signals or noise in the nearby frequency band, are filtered out.

[0042] Then, after amplification and filtering, the satellite signal needs to be impedance matched before being transmitted to the subsequent processing device (such as a satellite positioning receiver). By adjusting the impedance matching network (such as an LC network) in the circuit, the output impedance of the positioning communication module 12 is matched with the input impedance of the subsequent device, ensuring that the target satellite signal can be efficiently transmitted, reducing signal reflection and distortion, and providing a good signal basis for subsequent satellite signal processing (such as frequency conversion, demodulation, etc.).

[0043] Please refer to Figure 2 , Figure 2 is a structural block diagram of the radio communication module 11 provided by the embodiment of the present application.

[0044] In some embodiments, the radio communication module 11 includes a radio receiving unit 111, a radio impedance matching unit 112, and a radio output matching unit 113.

[0045] Among them, the radio receiving unit 111, the radio impedance matching unit 112, and the radio output matching unit 113 are connected in sequence;

[0046] Specifically, the radio receiving unit 111 is used to receive a radio signal. The radio impedance matching unit 112 is used to impedance match the radio signal. The radio output matching unit 113 is used to adjust the bandwidth and the standing wave ratio of the impedance matched radio signal to output a target radio signal.

[0047] In actual application, the radio receiving unit 111 is mainly the antenna part, which is responsible for receiving the radio signals propagating in the surrounding space. These radio signals include AM (amplitude modulation) and / or FM (frequency modulation) broadcast signals. The radio station transmits the audio information modulated to the high frequency carrier signal, which propagates in the space in the form of electromagnetic waves. The antenna of the radio receiving unit uses the principle of electromagnetic induction to convert the received electromagnetic waves into weak electric signals.

[0048] When the radio receiving unit 111 converts the radio signal into an electrical signal, the signal is transmitted to the radio impedance matching unit 112. In a circuit, the signal source (i.e. the broadcast station transmitting antenna) has its own output impedance, while the radio communication module 11 as a load also has an input impedance. If the two impedances are not matched, according to the circuit principle, the signal will be reflected at the interface during transmission. This reflection will cause loss of signal energy and distortion of the signal waveform. The radio impedance matching unit 112 forms a specific impedance matching network by adding appropriate elements in the circuit. The values of these elements are determined according to the output impedance of the signal source and the desired input impedance of the radio communication module. For example, through calculation and experiment, appropriate inductance and capacitance values are selected to achieve matching of the input and output impedances at the working frequency of the radio signal. This allows the signal to be smoothly transmitted from the signal source to the inside of the radio communication module 111, reduces reflection, and improves signal transmission efficiency.

[0049] After receiving the radio signal that has been impedance matched, the radio output matching unit 113 first adjusts the bandwidth. Since there are various electromagnetic signals in the surrounding environment, and the radio signal has a specific frequency range (different for AM and FM frequency bands). In order to filter out the target radio signal and suppress other interference signals, the radio signal after impedance matching needs to be filtered. This can effectively select the desired radio signal and improve the purity of the signal. At the same time, the voltage standing wave ratio (VSWR) is an important parameter for measuring the degree of matching between the transmission line and the load. In the radio circuit, an undesirable VSWR will cause signal reflection, affecting the effective transmission and reception quality of the signal. The radio output matching unit 113 optimizes the VSWR by adjusting the element parameters (such as the values of inductance and capacitance) in the circuit. The signal after bandwidth and VSWR adjustment is the target radio signal, which can be transmitted to the subsequent circuit for demodulation and other processing with higher quality, and ultimately restore the broadcast audio content.

[0050] Please refer to Figure 3 , Figure 3 is a circuit structure diagram of the radio communication module 11 provided by the embodiments of the present application.

[0051] In some embodiments, the radio receiving unit 111 includes a spring antenna, a capacitor C7, and an inductor L3. The spring antenna is connected to the first end of the capacitor C7 and the first end of the inductor L3, the second end of the inductor L3 is grounded, and the second end of the capacitor C7 is connected to the radio impedance matching unit 112. The spring antenna is used to receive a radio signal.

[0052] In some embodiments, the receiving impedance matching unit 112 includes a resistor R7, a resistor R8, and a resistor R9. Wherein, the first end of the resistor R7 and the first end of the resistor R8 are both connected with the receiving unit 111, the second end of the resistor R7 is grounded, the second end of the resistor R8 and the first end of the resistor R9 are both connected with the receiving output matching unit 113, and the second end of the resistor R9 is grounded.

[0053] In some embodiments, the receiving output matching unit 113 includes a resistor R10, a capacitor C8, and an inductor L4. Wherein, the first end of the inductor L4 and the first end of the capacitor C8 are both connected with the receiving impedance matching unit 112, the second end of the inductor L4 is grounded, the second end of the capacitor C8 and the first end of the resistor R10 are connected, and the second end of the resistor R10 is grounded. Wherein, the second end of the capacitor C8 is used for outputting the target receiving signal.

[0054] The working principle of the receiving communication module 11 will be described briefly below. Figure 3 The working principle of the receiving communication module 11 will be described briefly below.

[0055] Specifically, Figure 3 S6 in the figure is the spring antenna welding point input, and S5 is the coaxial cable output.

[0056] Firstly, the receiving signal on the ground line is received by the spring antenna and the inductor L3, and then output by the capacitor C7. Wherein, the inductor L3 also has the effect of preventing the receiving signal from flowing back into the ground. Then, the impedance (for example, the impedance can be 50Ω) is adjusted by the π-type circuit composed of the resistor R7, the resistor R8, and the resistor R9, so as to match the output of the entire circuit. Then, the bandwidth and the standing wave ratio are adjusted by the inductor L4, so as to satisfy the receiving effect, and then the target receiving signal is output from S5 (coaxial cable) by the capacitor C8. Wherein, the inductor L4 also has the effect of preventing the receiving signal from flowing back into the ground. The resistor R10 plays the role of reducing the high-frequency impedance, so as to reduce the signal noise.

[0057] Please refer to Figure 4 , Figure 4 is the structural block diagram of the positioning communication module 12 provided by the embodiments of the present application.

[0058] In some embodiments, the positioning communication module 12 includes a power supply unit 121, an amplification filtering unit 122, and a positioning impedance matching unit 123.

[0059] Wherein, the power supply unit 121 is connected with the power supply 200 and the amplification filtering unit 122 respectively, and the amplification filtering unit 122 is connected with the positioning impedance matching unit 123.

[0060] Specifically, the power supply unit 121 is configured to obtain power for the amplification and filtering unit 122 when the power supply 200 is powered on. The amplification and filtering unit 122 is configured to receive satellite signals and amplify and filter the satellite signals. The positioning impedance matching unit 123 is configured to perform impedance matching on the amplified and filtered satellite signals to output target satellite signals.

[0061] In actual applications, the power supply unit 121 is an interface part of the positioning communication module 12 and the power supply 200. When the power supply 200 is powered on, the power supply unit 121 starts to work, and its main function is to obtain power and provide stable power supply for the amplification and filtering unit 122.

[0062] The signal receiving part (for example, a ceramic antenna) of the amplification and filtering unit 122 first receives satellite signals. These satellite signals include GPS (Global Positioning System) signals and / or BD (Beidou Satellite Navigation System) signals, which are radio frequency signals transmitted from satellites far away from the earth, and the signal strength is very weak. In order to facilitate subsequent signal processing, it is necessary to amplify the signals. The amplification and filtering unit 122 amplifies the received satellite signals. In the space environment, there are various electromagnetic interference signals, and the frequency band of the satellite signals may also be interfered by other signals. Therefore, it is necessary to filter the satellite signals at the same time, so that the satellite signals of the target frequency band (the frequency band required by the user) pass through, and the interference signals of other frequency bands, such as other wireless signals or noise in the nearby frequency band, are filtered out, so as to obtain relatively pure satellite signals.

[0063] Then, the amplified and filtered satellite signals are transmitted to the positioning impedance matching unit 123. In the circuit, the signal source (i.e., the amplification and filtering unit 122) has its own output impedance, and the subsequent device receiving the satellite signals (such as a satellite positioning receiver) has an input impedance. If the two impedances are not matched, the signal will be reflected at the interface during transmission, resulting in loss of signal energy and distortion of signal waveform. Therefore, the positioning impedance matching unit 123 forms a specific impedance matching network by adding appropriate elements in the circuit. The values of these elements are determined according to the output impedance of the amplification and filtering unit and the expected input impedance of the subsequent device. For example, by calculation and experiment, appropriate inductance values and capacitance values are selected to achieve matching of the input and output impedances at the working frequency of the satellite signals. This ensures that the target satellite signals can be efficiently transmitted, reduces signal reflection and distortion, and provides a good signal basis for subsequent satellite signal processing (such as frequency conversion, demodulation, etc.).

[0064] Please refer to Figure 5 , Figure 5 which is a circuit structure schematic diagram of the positioning communication module 12 provided by the embodiments of the present application.

[0065] In some embodiments, the amplification and filtering unit 122 comprises a ceramic antenna (not shown in the figure), a voltage stabilizing diode D1, a capacitor C1, an inductor L1, an amplification chip U1, a filtering chip SWA1, and an amplification chip U2. Among them, the first end of the capacitor C1 is connected with the ceramic antenna for receiving satellite signals, the second end of the capacitor C1 is connected with the first end of the inductor L1, the second end of the inductor L1 is connected with the amplification chip U1, the amplification chip U1 is further connected with the filtering chip SWA1, the filtering chip SWA1 is further connected with the amplification chip U2, and the amplification chip U2 is further connected with the positioning impedance matching unit 123.

[0066] Specifically, the amplification chip U1 can be model AT2659S or any other suitable chip. The amplification chip U2 can be model AT2659S or any other suitable chip. The filtering chip SWA1 can be model NDFG010-1580SA or any other suitable chip.

[0067] In some embodiments, the power supply unit 121 comprises a resistor R2 and an inductor L2. Among them, the first end of the inductor L2 is connected with the power supply 200, the second end of the inductor L2 is connected with the first end of the resistor R2, and the second end of the resistor R2 is connected with the amplification and filtering unit 122.

[0068] Specifically, the power supply unit 121 further comprises a capacitor C6, a capacitor C9, a resistor R1, a resistor R3, a capacitor C2, and a capacitor C4 for voltage division and filtering.

[0069] In some embodiments, the positioning impedance matching unit 123 comprises a resistor R4, a resistor R5, and a resistor R6. Among them, the first end of the resistor R4 is connected with the first end of the resistor R5 and the amplification and filtering unit 122, the second end of the resistor R4 is grounded, the second end of the resistor R5 is connected with the first end of the resistor R6, and the second end of the resistor R6 is grounded. Among them, the second end of the resistor R5 is used for outputting the target satellite signal.

[0070] In some embodiments, the positioning communication module 12 further comprises a capacitor C3 and a capacitor C5. Among them, the first end of the capacitor C5 is connected with the amplification and filtering unit 122, the second end of the capacitor C5 is connected with the positioning impedance matching unit 123, the first end of the capacitor C3 is connected with the positioning impedance matching unit 123, and the second end of the capacitor C3 is used for outputting the target satellite signal.

[0071] The working principle of the positioning communication module 12 will be described below. Figure 5

[0072] Specifically, Figure 5 S2 in the formula (1) is the input of the ceramic antenna, Figure 5 S1 in the formula (1) is the output of the coaxial cable.

[0073] ​In the positioning communication module 12, the DC power supply is connected with the power supply 200 through S1 (coaxial cable) to provide the DC power supply. The inductance L2 (passing DC and blocking high-frequency GPS signal), the resistance R2 (for voltage reduction) input the amplification chip U1, the filter chip SAW1 and the amplification chip U2 to meet the voltage and current requirements of the chip. It is worth noting that the target satellite signal is also output through S1 (coaxial cable).

[0074] The satellite signal (GPS signal and / or BD signal) is received through S2 (ceramic antenna), and the capacitor C1 and the inductance L1 are used for filtering and matching network. Then, the input amplification chip U1 is used for amplification, and then the filter chip SAW1 is used for filtering and frequency selection and out-of-band suppression. Then, the amplification chip U2 is used for amplification. Finally, the target satellite signal is output by S1 through the impedance matching of the π-type circuit composed of the resistance R4, the resistance R5 and the resistance R6.

[0075] The communication circuit 100 provided by the embodiment of the present application integrates the radio communication and positioning communication functions in one circuit, solves the problem that multiple independent circuits are needed to realize the radio and positioning functions in the prior art, and simplifies the circuit.

[0076] Moreover, the combination of the GPS / BD amplifier antenna and the radio AM / FM passive antenna is realized at a lower circuit cost, the circuit is more practical, and the debugging is simpler. In the application of the lower-cost antenna, the satellite signal can be stably positioned, and the extremely weak radio signal can be stably received, so that the vehicle-mounted multimedia host is provided with high-quality radio signals and high-quality positioning signals to realize the corresponding functional requirements.

[0077] Please refer to Figure 6 , Figure 6 which is a structural schematic diagram of a circuit board 1000 provided by the embodiment of the present application.

[0078] The embodiment of the present application further provides a circuit board 1000, which comprises a first ground wire 101 and the communication circuit 100 as described above. The first ground wire 101 is connected with the radio communication module 11 of the communication circuit 100. The first ground wire 101 surrounds the outer circle of the circuit board 1000.

[0079] The circuit board 1000 provided by the embodiment of the present application is in a curved surrounding shape, and surrounds the outer circle of the circuit board 1000. The length of the receiving line is increased, so that the accuracy of the received radio signal is improved. Meanwhile, the signal amplification device does not need to be arranged in the radio communication module 11, and the circuit is simplified.

[0080] The circuit structure and working principle of the communication circuit 100 can refer to the above-mentioned embodiment, which will not be described herein again.

[0081] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; under the concept of the present application, the technical features of the above examples or different examples can also be combined, and there are many other changes of different aspects of the present application as described above, which are not provided in detail for simplicity; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A communication circuit, characterized by, The communication circuit comprises a radio communication module and a positioning communication module; The positioning communication module is connected with the power supply; The radio communication module is configured to receive a radio signal and perform impedance matching and bandwidth adjustment on the radio signal to output a target radio signal; The positioning communication module is configured to receive a satellite signal and perform amplification, filtering and impedance matching on the satellite signal to output a target satellite signal when the power supply is powered on.

2. The communication circuit according to claim 1, characterized by The radio communication module comprises a radio receiving unit, a radio impedance matching unit and a radio output matching unit; The radio receiving unit, the radio impedance matching unit and the radio output matching unit are connected in sequence; The radio receiving unit is configured to receive the radio signal; The radio impedance matching unit is configured to perform impedance matching on the radio signal; The radio output matching unit is configured to adjust the bandwidth and the standing wave ratio of the radio signal after impedance matching to output the target radio signal.

3. The communication circuit of claim 2, wherein, The radio receiving unit comprises a spring antenna, a capacitor C7 and an inductor L3; The spring antenna is connected with the first end of the capacitor C7 and the first end of the inductor L3, the second end of the inductor L3 is grounded, and the second end of the capacitor C7 is connected with the radio impedance matching unit; The spring antenna is configured to receive the radio signal.

4. The communication circuit of claim 2, wherein, The radio impedance matching unit comprises a resistor R7, a resistor R8 and a resistor R9; The first end of the resistor R7 and the first end of the resistor R8 are connected with the radio receiving unit, the second end of the resistor R7 is grounded, and the second end of the resistor R8 and the first end of the resistor R9 are connected with the radio output matching unit, and the second end of the resistor R9 is grounded.

5. The communication circuit of claim 2, wherein, The radio output matching unit comprises a resistor R10, a capacitor C8 and an inductor L4; The first end of the inductor L4 and the first end of the capacitor C8 are connected with the radio impedance matching unit, the second end of the inductor L4 is grounded, and the second end of the capacitor C8 and the first end of the resistor R10 are connected, and the second end of the resistor R10 is grounded; The second end of the capacitor C8 is configured to output the target radio signal.

6. The communication circuit of claim 1, wherein, The positioning communication module comprises a power supply unit, an amplification and filtering unit and a positioning impedance matching unit; The power supply unit is connected with the power supply and the amplification and filtering unit respectively, and the amplification and filtering unit is connected with the positioning impedance matching unit; The power supply unit is configured to obtain electric energy to power the amplification and filtering unit when the power supply is powered on; The amplification and filtering unit is configured to receive the satellite signal and perform amplification and filtering on the satellite signal; The positioning impedance matching unit is configured to perform impedance matching on the satellite signal after amplification and filtering to output the target satellite signal.

7. The communication circuit of claim 6, wherein, The positioning impedance matching unit comprises a resistor R4, a resistor R5 and a resistor R6; The first end of the resistor R4 is connected with the first end of the resistor R5 and the amplification and filtering unit, the second end of the resistor R4 is grounded, the second end of the resistor R5 is connected with the first end of the resistor R6, and the second end of the resistor R6 is grounded; The second end of the resistor R5 is configured to output the target satellite signal.

8. The communication circuit of claim 6, wherein, The power supply unit comprises a resistor R2 and an inductor L2. The first end of the inductor L2 is connected to the power supply, the second end of the inductor L2 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the amplification and filtering unit.

9. The communication circuit of any of claims 6 to 8, wherein, The positioning communication module further comprises a capacitor C3 and a capacitor C5. The first end of the capacitor C5 is connected to the amplification and filtering unit, the second end of the capacitor C5 is connected to the positioning impedance matching unit, the first end of the capacitor C3 is connected to the positioning impedance matching unit, and the second end of the capacitor C3 is configured to output the target satellite signal.

10. A circuit board, characterized by The circuit board comprises a first ground wire and the communication circuit according to any one of claims 1 to 9. The first ground wire is connected to the radio communication module of the communication circuit. The first ground wire is arranged around the outer ring of the circuit board.

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