Signal receiving circuit, radio frequency communication device and electronic equipment

Abstract

Embodiments of the present application provide a signal receiving circuit, a radio frequency communication device and an electronic device. The signal receiving circuit comprises: a matching unit electrically connected between a signal transmitting end of a radio frequency communication module and a radio frequency antenna, and configured to perform impedance matching on the signal transmitting end of the radio frequency communication module and the radio frequency antenna; and a receiving unit electrically connected between a signal receiving end of the radio frequency communication module and a voltage receiving node, and configured to receive an antenna voltage signal from the voltage receiving node and transmit the antenna voltage signal to the signal receiving end; wherein the matching unit comprises a capacitor assembly in parallel with the radio frequency antenna, the capacitor assembly comprises at least one group of multiple capacitors in series, a first end of the at least one group of multiple capacitors in series is electrically connected with the radio frequency antenna, and a last end of the group of multiple capacitors in series is grounded, and the voltage receiving node is located between two adjacent capacitors in the multiple capacitors in series.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and in particular to a signal receiving circuit, a radio frequency communication device, and an electronic device. Background Technology

[0002] Currently, radio frequency (RF) communication technology is increasingly used in daily life. For example, NFC (Near Field Communication) technology can be applied to various fields, including but not limited to payments, digital ordering, electronic ticketing, access control, mobile identity verification, and anti-counterfeiting. Some RF communication devices (such as NFC communication devices) may include an RF communication module (such as an NFC communication module), a signal receiving circuit, and an RF antenna (such as an NFC antenna). The signal receiving circuit typically includes an antenna matching circuit and is electrically connected between the RF communication module and the RF antenna. Due to increasingly stringent performance requirements for RF antennas, their area and number of turns are increasing, resulting in a significant increase in the antenna voltage signal received by the signal receiving circuit and transmitted to the RF communication module. However, the internal attenuation resistance of the RF communication module has a minimum value limit, making it difficult to reduce the significantly increased antenna voltage signal to the required input dynamic range of the signal receiving end. This can easily lead to decoding errors or even hardware damage to the RF communication module. Therefore, new technical solutions are needed to address this technical problem. Summary of the Invention

[0003] In view of this, embodiments of this application provide a signal receiving circuit, a radio frequency communication device, and an electronic device to at least partially improve the above-mentioned problems.

[0004] According to a first aspect of the embodiments of this application, a signal receiving circuit is provided, comprising: A matching unit is electrically connected between the signal transmitting end of the radio frequency communication module and the radio frequency antenna, and is configured to perform impedance matching between the signal transmitting end of the radio frequency communication module and the radio frequency antenna. The receiving unit is electrically connected between the signal receiving end and the voltage receiving node of the radio frequency communication module, and is configured to receive the antenna voltage signal from the voltage receiving node and transmit the antenna voltage signal to the signal receiving end. The matching unit includes a capacitor assembly connected in parallel with the radio frequency antenna. The capacitor assembly includes at least one set of multiple capacitors connected in series. The first end of the at least one set of multiple capacitors connected in series is electrically connected to the radio frequency antenna, and the end of the set of multiple capacitors connected in series is grounded. The voltage receiving node is located between two adjacent capacitors in the multiple capacitors connected in series.

[0005] In some alternative embodiments, the capacitor assembly includes a set of n capacitors connected in series, where n ≥ 2 and n is an integer; Of the n capacitors: the second end of the kth capacitor is electrically connected to the first end of the (k+1)th capacitor, the first end of the 1st capacitor forms the head end and is electrically connected to the first end of the radio frequency antenna, the second end of the nth capacitor forms the tail end and is electrically connected to the second end of the radio frequency antenna, and the second end of the nth capacitor is grounded, where 1≤k≤n-1 and k is an integer; The receiving unit is electrically connected to a voltage receiving node between the second end of one pair of adjacent k-th capacitors and the first end of the (k+1)-th capacitor.

[0006] In some alternative embodiments, the capacitor assembly includes a set of two capacitors connected in series, wherein: The first terminal of the first capacitor is electrically connected to the first terminal of the radio frequency antenna, the second terminal of the first capacitor is electrically connected to the first terminal of the second capacitor, the second terminal of the second capacitor is electrically connected to the second terminal of the radio frequency antenna, and the second terminal of the second capacitor is grounded. The receiving unit is electrically connected to a voltage receiving node between the second end of the first capacitor and the first end of the second capacitor.

[0007] In some optional embodiments, the signal transmitting end of the radio frequency communication module includes a first signal transmitting end and a second signal transmitting end; The matching unit further includes a harmonic suppression sub-circuit and an impedance matching sub-circuit. The first signal transmitting end and the second signal transmitting end are both electrically connected to the harmonic suppression sub-circuit, and the harmonic suppression sub-circuit is electrically connected to the first end through the impedance matching sub-circuit.

[0008] In some optional embodiments, the signal receiving end of the radio frequency communication module includes a first signal receiving end and a second signal receiving end; The receiving unit includes a first receiving unit and a second receiving unit, and the voltage receiving node includes a first voltage receiving node and a second voltage receiving node. The first receiving unit is electrically connected between the first signal receiving terminal and the first voltage receiving node, and the second receiving unit is electrically connected between the second signal receiving terminal and the second voltage receiving node; The capacitor assembly includes a first group of multiple capacitors connected in series and a second group of multiple capacitors connected in series. The first end of the first group of multiple capacitors connected in series is electrically connected to the first end of the radio frequency antenna, and the end of the first group of multiple capacitors connected in series is grounded. The first voltage receiving node is located between two adjacent capacitors in the first group of multiple capacitors connected in series. The first end of the second group of capacitors connected in series is electrically connected to the second end of the radio frequency antenna, and the end of the second group of capacitors connected in series is grounded. The second voltage receiving node is located between two adjacent capacitors in the second group of capacitors connected in series.

[0009] In some alternative embodiments, the first group of capacitors connected in series includes two capacitors in total, and the second group of capacitors connected in series also includes two capacitors in total.

[0010] In some optional embodiments, the signal transmitting end of the radio frequency communication module includes a first signal transmitting end and a second signal transmitting end; The matching unit further includes a first impedance matching sub-circuit and a second impedance matching sub-circuit; wherein... The first impedance matching sub-circuit is electrically connected between the first signal transmitting end and the first end of the first group of multiple capacitors connected in series; The second impedance matching sub-circuit is electrically connected between the second signal transmitting end and the first end of the second group of multiple capacitors connected in series.

[0011] In some alternative embodiments, the matching unit further includes at least one first resistor; The first ends of each group of capacitors connected in series are electrically connected to the radio frequency antenna through a first resistor.

[0012] In some optional embodiments, the receiving unit includes a second resistor electrically connected between the signal receiving end and the voltage receiving node of the radio frequency communication module; The second resistor and the variable attenuation resistor inside the radio frequency communication module form a resistor voltage divider circuit. The receiving unit receives the antenna voltage signal from the voltage receiving node through the second resistor in the resistor voltage divider circuit.

[0013] In some optional embodiments, the radio frequency communication module is an NFC communication module, and the radio frequency antenna is an NFC antenna.

[0014] According to a second aspect of the embodiments of this application, a radio frequency communication device is provided, including: a radio frequency communication module, a radio frequency antenna, and a signal receiving circuit as described in any one of the first aspects.

[0015] According to a third aspect of the embodiments of this application, an electronic device is provided, including: a radio frequency communication device as described in the second aspect.

[0016] The signal receiving circuit provided in this application embodiment has a matching unit electrically connected between the signal transmitting end of the radio frequency communication module and the radio frequency antenna, and is capable of impedance matching between the signal transmitting end of the radio frequency communication module and the radio frequency antenna. The receiving unit is electrically connected between the signal receiving end of the radio frequency communication module and the voltage receiving node, and is capable of receiving the antenna voltage signal from the voltage receiving node and transmitting the antenna voltage signal to the signal receiving end. Furthermore, the matching unit includes a capacitor assembly connected in parallel with the radio frequency antenna. The capacitor assembly includes at least one set of multiple capacitors connected in series. The first end of the at least one set of multiple capacitors connected in series is electrically connected to the radio frequency antenna, and the end of the set of multiple capacitors connected in series is grounded. The voltage receiving node is located between two adjacent capacitors in the multiple capacitors connected in series. Based on this, on the one hand, the receiving unit of the signal receiving circuit in this embodiment can obtain the antenna voltage signal between two adjacent capacitors in the capacitor assembly of the matching unit. Therefore, compared with the receiving unit directly obtaining the antenna voltage signal from the first end of the capacitor assembly, the antenna voltage signal received by the receiving unit can be reduced, so that the antenna voltage signal received by the signal receiving end of the RF communication module can better meet the required input dynamic range. Therefore, it can better adapt to the current requirements of larger area and more turns of RF antennas, and reduce the risk of decoding errors or even hardware damage in the RF communication module. On the other hand, since the receiving unit obtains the antenna voltage signal between two adjacent capacitors in the capacitor assembly of the matching unit, at least one capacitor can be reused to implement the function of DC removal of the antenna voltage signal received by the receiving unit, thereby reducing the number of DC blocking capacitors in the receiving unit, thereby reducing the hardware implementation cost of the signal receiving circuit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of an exemplary radio frequency communication device according to this application is shown.

[0019] Figure 2 A schematic diagram of an exemplary signal receiving circuit according to this application is shown.

[0020] Figure 3 A schematic diagram of another exemplary signal receiving circuit of this application is shown.

[0021] Figure 4A schematic diagram of another exemplary signal receiving circuit of this application is shown.

[0022] Figure 5 A schematic diagram of an exemplary electronic device according to this application is shown.

[0023] Explanation of reference numerals in the attached figures: 100. Signal receiving circuit; 200. Radio frequency communication module; 300. Radio frequency antenna; 10. Matching unit; 11. Capacitor assembly; 12. Harmonic suppression sub-circuit; 13. Impedance matching sub-circuit; 131. First impedance matching sub-circuit; 132. Second impedance matching sub-circuit; 20. Receiving unit; 21. First receiving unit; 22. Second receiving unit; 210. Signal transmitting end; 211. First signal transmitting end; 212. Second signal transmitting end; 220. Signal receiving end; 221. First signal receiving end; 222. Second signal receiving end; 230. Voltage receiving node; 231. First voltage receiving node; 232. Second voltage receiving node; 1000. Radio frequency communication device; 2000. Electronic equipment. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0025] First, the radio frequency communication device provided in the embodiments of this application will be described. (Refer to...) Figure 1 As shown, the radio frequency communication device 1000 may include: a radio frequency communication module 200, a signal receiving circuit 100, and a radio frequency antenna 300. The signal receiving circuit 100 may be the signal receiving circuit provided in the embodiments below.

[0026] The radio frequency (RF) communication module 200 can be hardware that performs RF signal transmission, reception, and processing. For example, the RF communication module 200 can be implemented as an RF communication chip. The RF communication module 200 may include one or more signal transmitters 210 (e.g., Figure 2 , Figure 3 , Figure 4 (TXP and / or TXN in the signal), and one or more signal receivers 220 (e.g. Figure 2 , Figure 3 , Figure 4(RXP and / or RXN in the signal transmitter 210). The signal transmitter 210 can transmit radio frequency drive signals to the outside, and the signal receiver 220 can receive the antenna voltage signal of the radio frequency antenna 300. The radio frequency communication module 200 can demodulate and decode the antenna voltage signal. The signal receiver 220 of the radio frequency communication module 200 has certain input dynamic range requirements; antenna voltage signals exceeding this range may cause decoding failure or even hardware damage. Optionally, the radio frequency communication module 200 may also include a grounding terminal for grounding (e.g., RXP and / or RXN in the signal transmitter 210). Figure 2 , Figure 3 , Figure 4 (VSSTX in the example). The radio frequency communication module 200 can be of any type. In some optional embodiments, the radio frequency communication module 200 can be an NFC communication module.

[0027] The radio frequency antenna 300 can convert the radio frequency drive signal output by the radio frequency communication module 200 into an electromagnetic field and sense an external electromagnetic field to generate an antenna voltage signal. For example, when the radio frequency communication module 200 is an NFC communication module, the radio frequency antenna 300 can be an NFC antenna.

[0028] The signal receiving circuit 100 can be electrically connected between the RF communication module 200 and the RF antenna 300. The signal receiving circuit 100 can be used to achieve impedance matching between the signal transmitting end 210 of the RF communication module 200 and the RF antenna 300, thereby ensuring efficient energy transmission. Furthermore, the signal receiving circuit 100 can also acquire the antenna voltage signal corresponding to the RF antenna 300 and transmit the antenna voltage signal to the signal receiving end 220 of the RF communication module 200, thereby achieving normal signal reception.

[0029] It should be understood that the signal receiving circuit 100 in this embodiment of the application, through improvements, can better adapt to the current requirements of larger area and more turns of the RF antenna 300, reducing the risk of decoding errors or even hardware damage to the RF communication module 200. The signal receiving circuit 100 in this embodiment of the application will be further described below.

[0030] According to one aspect of the embodiments of this application, referring to Figure 2 , Figure 3 , Figure 4As shown, the signal receiving circuit 100 in this embodiment may include a matching unit 10 and a receiving unit 20. The matching unit 10 is electrically connected between the signal transmitting end 210 of the RF communication module 200 and the RF antenna 300, and is configured to perform impedance matching between the signal transmitting end 210 and the RF antenna 300. The receiving unit 20 is electrically connected between the signal receiving end 220 of the RF communication module 200 and the voltage receiving node 230, and is configured to receive the antenna voltage signal from the voltage receiving node 230 and transmit the antenna voltage signal to the signal receiving end 220. The matching unit 10 includes a capacitor assembly 11 connected in parallel with the RF antenna 300. The capacitor assembly 11 includes at least one set of multiple capacitors connected in series. The first end of the at least one set of multiple capacitors connected in series is electrically connected to the RF antenna 300, and the end of the set of multiple capacitors connected in series is grounded. The voltage receiving node 230 is located between two adjacent capacitors in the multiple capacitors connected in series.

[0031] Based on this, on the one hand, the receiving unit 20 of the signal receiving circuit 100 in this embodiment can obtain the antenna voltage signal between two adjacent capacitors in the capacitor assembly 11 of the matching unit 10. Therefore, compared with the receiving unit directly obtaining the antenna voltage signal from the first end of the capacitor assembly, the antenna voltage signal received by the receiving unit 20 can be reduced, so that the antenna voltage signal received by the signal receiving end 220 of the RF communication module 200 can better meet the required input dynamic range. Therefore, it can better adapt to the current requirements of larger area and more turns of the RF antenna 300, and reduce the risk of decoding errors or even hardware damage in the RF communication module 200. On the other hand, since the receiving unit 20 obtains the antenna voltage signal between two adjacent capacitors in the capacitor assembly 11 of the matching unit 10, at least one capacitor can be reused to perform the function of DC removal on the antenna voltage signal received by the receiving unit 20, thereby reducing the number of DC blocking capacitors in the receiving unit 20, thereby reducing the hardware implementation cost of the signal receiving circuit 100.

[0032] In this embodiment, the matching unit 10 can be used to achieve impedance matching between the signal transmitting end 210 of the RF communication module 200 and the RF antenna 300, thereby ensuring efficient energy transmission. The matching unit 10 can be composed of a combination network of circuit elements including but not limited to capacitors, inductors, and resistors. The circuit structure of the matching unit 10 can be flexibly selected according to the specific parameters of the RF communication module 200 and the RF antenna 300, and this embodiment does not impose any limitations on this.

[0033] During radio frequency (RF) communication, after the RF antenna 300 is excited by an external magnetic field, an induced electromotive force is generated on the antenna side, forming an antenna voltage signal at the relevant node. In this embodiment, the receiving unit 20 can be used to receive the antenna voltage signal from the voltage receiving node 230 and transmit the antenna voltage signal to the signal receiving end 220 of the RF communication module 200, thereby achieving normal signal reception. Afterwards, the RF communication module 200 can further demodulate, decode, or perform other related processing on the antenna voltage signal received by the signal receiving end 220.

[0034] The circuit structure of the receiving unit 20 can be selected as needed, as long as it meets the voltage signal reception requirements. To facilitate the explanation of the embodiments of this application, some circuit structures of the receiving unit 20 in the embodiments of this application will be described in detail below.

[0035] In this embodiment, the matching unit 10 may include a capacitor assembly 11, which includes at least one set of multiple capacitors connected in series. The first end of the set of multiple capacitors connected in series is electrically connected to the radio frequency antenna 300, and the last end of the set of multiple capacitors connected in series is grounded, thereby forming a capacitive voltage divider path from the radio frequency antenna 300 to ground. In this embodiment, the receiving unit 20 may be electrically connected between two adjacent capacitors in the multiple capacitors connected in series. The electrical connection point is the voltage receiving node 230, from which the receiving unit 20 can receive the antenna voltage signal.

[0036] It should be understood that the specific circuit structure of capacitor assembly 11, capacitor connection method, specific number of capacitors, and specific location of voltage receiving node 230 can all be selected according to actual needs, as long as the requirements are met.

[0037] For example, refer to Figure 2 , Figure 3 As shown, in some optional embodiments, the capacitor assembly 11 may include a group of n capacitors connected in series, where n ≥ 2 and n is an integer; of the n capacitors: the second end of the k-th capacitor is electrically connected to the first end of the (k+1)-th capacitor, the first end of the 1-th capacitor forms the first end of the n capacitors and is electrically connected to the first end of the radio frequency antenna 300, the second end of the n-th capacitor forms the last end of the n capacitors and is electrically connected to the second end of the radio frequency antenna 300, and the second end of the n-th capacitor is grounded, where 1 ≤ k ≤ n-1 and k is an integer; the receiving unit 20 is electrically connected to a voltage receiving node 230 between a pair of adjacent second ends of the k-th capacitor and the first end of the (k+1)-th capacitor.

[0038] As an example, refer to Figure 2 As shown, the capacitor assembly 11 includes a group of n capacitors connected in series, which can be denoted as follows: , , ... ... Then the voltage receiving node 230 can be: and node 1 between and node 2 between and The nodes m, ..., or and The receiving unit 20 can be electrically connected to any one of nodes 1, ..., n-1 as needed to draw power, and the location of the electrical connection is the voltage receiving node 230. The receiving unit 20 can transmit the antenna voltage signal it receives to the signal receiving end 220 (such as RXP) of the radio frequency communication module 200.

[0039] For example, refer to Figure 2 As shown, this section uses n capacitors connected in series in capacitor assembly 11. , , ... ... Taking the same charge Q as an example, if the receiving unit 20 is electrically connected to node m (that is, the voltage receiving node 230 is node m) to receive the antenna voltage signal, then:

[0040]

[0041]

[0042] in, Indicates the first capacitor The voltage value at the first terminal (that is, the first terminal of the n capacitors), This represents the voltage value at node m (i.e., voltage receiving node 230). This represents the capacitance value of the k-th capacitor out of the n capacitors.

[0043] Eliminating Q from the above equation, we get:

[0044] in, This represents the voltage value of the antenna voltage signal received by the receiving unit 20 from node m (i.e., voltage receiving node 230).

[0045] As can be seen from the above derivation, in the above optional embodiments, the capacitor assembly 11 in this application embodiment is designed to include a set of n capacitors connected in series, and the receiving unit 20 is electrically connected to the voltage receiving node 230 between the second end of a pair of adjacent k-th capacitors and the first end of the (k+1)-th capacitor. Therefore, the antenna voltage signal received by the receiving unit 20 must be less than the voltage at the first end of the first capacitor among the n capacitors (that is, the voltage at the first end).

[0046] Based on this, the optional circuit structure in this embodiment effectively reduces the antenna voltage signal received by the receiving unit 20, making the antenna voltage signal received by the signal receiving end 220 of the RF communication module 200 better meet the required input dynamic range. Therefore, it can better adapt to the current requirements of larger area and more turns in the RF antenna 300, reducing the risk of decoding errors or even hardware damage in the RF communication module 200. Furthermore, at least one capacitor (e.g., in the example above) , , ... The function of removing DC from the antenna voltage signal received by the receiving unit 20 can be implemented in a reusable manner, thereby reducing the number of DC blocking capacitors in the receiving unit 20 and thus reducing the hardware implementation cost of the signal receiving circuit 100.

[0047] It is understandable that, since the second end (i.e., the end) of the nth capacitor is electrically connected to the RF antenna 300, and the second end of the nth capacitor is also grounded, the RF antenna 300 is also grounded at one end. This makes the above optional circuit structure particularly suitable for single-ended RF antenna scenarios, effectively adapting to the need for a larger area and more turns of single-ended RF antennas, and effectively reducing the risk of decoding errors or even hardware damage to the RF communication module 200.

[0048] Furthermore, in the above optional circuit structure, by reasonably selecting the number of capacitors among the n capacitors, the capacitance value of each capacitor, and the power extraction position (i.e., the position of the voltage receiving node 230), the magnitude of the antenna voltage signal received by the receiving unit 20 can be flexibly adjusted, thereby flexibly meeting the input dynamic range requirements of the signal receiving end 220 of the radio frequency communication module 200.

[0049] In some alternative embodiments, refer to Figure 3As shown, the capacitor assembly 11 includes a set of two capacitors connected in series, wherein: the first end of the first capacitor is electrically connected to the first end of the radio frequency antenna 300, the second end of the first capacitor is electrically connected to the first end of the second capacitor, the second end of the second capacitor is electrically connected to the second end of the radio frequency antenna 300, and the second end of the second capacitor is grounded; the receiving unit 20 is electrically connected to a voltage receiving node 230 between the second end of the first capacitor and the first end of the second capacitor.

[0050] That is, in this optional embodiment, n=2, so the receiving unit 20 can be directly electrically connected between the second end of the first capacitor and the first end of the second capacitor, and the electrical connection point is the voltage receiving node 230.

[0051] In such an alternative embodiment, the following applies:

[0052] It can be seen that drawing power from the first terminal (i.e., the starting terminal) of the first capacitor can yield... In contrast, in the above optional embodiment, the receiving unit 20 obtains the antenna voltage signal from the voltage receiving node 230 between the second end of the first capacitor and the first end of the second capacitor, and the voltage value... Compare Attenuation times.

[0053] Based on this, in this embodiment of the application, by using such an optional circuit structure, the capacitor assembly 11 is designed to include a set of two capacitors connected in series, and the receiving unit 20 is electrically connected to the voltage receiving node 230 between the second end of the first capacitor and the first end of the second capacitor. This effectively reduces the antenna voltage signal received by the receiving unit 20, making the antenna voltage signal received by the signal receiving end 220 of the RF communication module 200 better meet the required input dynamic range. Therefore, it can better adapt to the current requirements of larger area and more turns of the RF antenna 300, reducing the risk of decoding errors or even hardware damage in the RF communication module 200. Furthermore, the above circuit structure is relatively simple and efficient, saves on the number of capacitors, has lower hardware costs, and helps reduce the layout area. In addition, at least one capacitor (e.g., in the example above) The function of removing DC from the antenna voltage signal received by the receiving unit 20 can be implemented in a reusable manner, thereby reducing the number of DC blocking capacitors in the receiving unit 20 and thus reducing the hardware implementation cost of the signal receiving circuit 100.

[0054] It is understandable that, since the second end (i.e., the end) of the second capacitor is electrically connected to the RF antenna 300, and the second end of the second capacitor is also grounded, the RF antenna 300 is also grounded at one end. This makes the above optional circuit structure particularly suitable for single-ended RF antenna scenarios, effectively adapting to the need for a larger area and more turns of single-ended RF antennas, and effectively reducing the risk of decoding errors or even hardware damage to the RF communication module 200.

[0055] Furthermore, in the above optional circuit structure, by reasonably selecting the capacitance value of each of the two capacitors, the magnitude of the antenna voltage signal received by the receiving unit 20 can be flexibly adjusted, thereby flexibly meeting the input dynamic range requirements of the signal receiving end 220 of the radio frequency communication module 200.

[0056] In some alternative embodiments, refer to Figure 2 , Figure 3 As shown, the matching unit 10 may also include a target capacitor. Target capacitor It is connected in parallel between the start and end terminals of the n capacitors connected in series in this group.

[0057] In this case, Figure 2 For example, the following relationship exists between capacitance values:

[0058] in, Represents n capacitors (i.e. , , ... ... ) and target capacitor The total capacitance value. And with Figure 3 For example, the following relationship exists between capacitance values: .

[0059] It should be noted that the target capacitor Whether to use it can be selected as needed, and this application embodiment does not limit this.

[0060] In some alternative embodiments, refer to Figure 2 , Figure 3As shown, the signal transmitting end 210 of the radio frequency communication module 200 includes a first signal transmitting end 211 (e.g., TXP) and a second signal transmitting end 212 (e.g., TXN); the matching unit 10 further includes a harmonic suppression sub-circuit 12 and an impedance matching sub-circuit 13. The first signal transmitting end 211 and the second signal transmitting end 212 are both electrically connected to the harmonic suppression sub-circuit 12. The harmonic suppression sub-circuit 12 is electrically connected to the first terminals of a group of multiple capacitors connected in series in the capacitor assembly 11 (e.g., TXN) through the impedance matching sub-circuit 13. Figure 2 , Figure 3 The first capacitor in (the first end).

[0061] In this embodiment, the harmonic suppression sub-circuit 12 of the matching unit 10 can be used to filter out harmonic components in the output signal of the signal transmitting end 210 (such as the first signal transmitting end 211 and the second signal transmitting end 212) of the radio frequency communication module 200. When the signal transmitting end 210 of the radio frequency communication module 200 outputs the radio frequency drive signal, it inevitably generates harmonic components at integer multiples of the fundamental frequency. If these harmonic components are not suppressed, they will adversely affect the signal quality and electromagnetic compatibility of the radio frequency communication. Therefore, in this embodiment, the harmonic suppression sub-circuit 12 is used to suppress these undesirable harmonic components to ensure the quality of the signal transmitted to the radio frequency antenna 300.

[0062] The circuit form of the harmonic suppression sub-circuit 12 can be, but is not limited to, an EMC filter, a low-pass filter, a band-pass filter, or other networks with harmonic suppression function. The specific circuit structure of the harmonic suppression sub-circuit 12 is not limited in the embodiments of this application, as long as it can perform the corresponding function.

[0063] Impedance matching sub-circuit 13 can be a functional sub-circuit that further realizes impedance transformation between harmonic suppression sub-circuit 12 and radio frequency antenna 300. It can provide the necessary impedance transformation between the output terminal of harmonic suppression sub-circuit 12 and the first terminals of a group of multiple capacitors connected in series in capacitor assembly 11 to ensure that the transmission characteristics of the entire matching unit 10 meet the design requirements.

[0064] It is understood that in this embodiment of the application, by connecting both the first signal transmitting end 211 and the second signal transmitting end 212 to the harmonic suppression sub-circuit 12, and then connecting the harmonic suppression sub-circuit 12 to the first end of a group of multiple capacitors connected in series in the capacitor assembly 11 via the impedance matching sub-circuit 13, a complete signal transmission path of "signal transmitting end 210 → harmonic suppression sub-circuit 12 → impedance matching sub-circuit 13 → first end → radio frequency antenna 300" is formed.

[0065] Based on this, the circuit structure of the above optional embodiments can effectively improve the quality of signals transmitted from the first signal transmitting end 211 and the second signal transmitting end 212 of the RF communication module 200 to the RF antenna 300 through the harmonic suppression sub-circuit 12, and improve the overall signal quality of RF communication; furthermore, the impedance matching sub-circuit 13 can perform impedance matching between the output end of the harmonic suppression sub-circuit 12 and the RF antenna 300, and together with the capacitor assembly 11, form a complete antenna matching network, thereby further ensuring the driving effect of the RF communication module 200 on the RF antenna 300 and improving the RF communication performance.

[0066] Optionally, refer to Figure 2 , Figure 3 As shown, the harmonic suppression sub-circuit 12 may include a first inductor L1 and a fourth capacitor C4; wherein, the first terminal of the first inductor L1 is electrically connected to the first signal transmitting terminal 211; the first terminal of the fourth capacitor C4 is electrically connected to the second signal transmitting terminal 212; and the second terminal of the fourth capacitor C4 is electrically connected to the second terminal of the first inductor L1. Optionally, referring to... Figure 2 , Figure 3 As shown, the impedance matching sub-circuit 13 may include a second inductor L2, a fifth capacitor C5, and a first capacitor C1; the first terminal of the second inductor L2 is electrically connected to the second terminal of the first inductor L1, and the second terminal of the second inductor L2 is electrically connected to the first terminal of the first capacitor C1; the first terminal of the fifth capacitor C5 is electrically connected to the second terminal of the second inductor L2, and the second terminal of the fifth capacitor C5 is grounded; the second terminal of the first capacitor C1 is electrically connected to the first terminal of a group of multiple capacitors connected in series in the capacitor assembly 11 (e.g., ...). Figure 2 , Figure 3 The first capacitor in (The first end). It should be understood that such an optional circuit structure can effectively realize the corresponding functions of the harmonic suppression sub-circuit 12 and the impedance matching sub-circuit 13.

[0067] In some alternative embodiments, refer to Figure 4As shown, the signal receiving end of the radio frequency communication module 200 includes a first signal receiving end 221 (e.g., RXP) and a second signal receiving end 222 (e.g., RXN); the receiving unit 20 includes a first receiving unit 21 and a second receiving unit 22, and the voltage receiving node 230 includes a first voltage receiving node 231 and a second voltage receiving node 232; the first receiving unit 21 is electrically connected between the first signal receiving end 221 and the first voltage receiving node 231, and the second receiving unit 22 is electrically connected between the second signal receiving end 222 and the second voltage receiving node 232; the capacitor assembly 11 may include a first group of multiple capacitors connected in series and a second group of multiple capacitors connected in series; the first end of the first group of multiple capacitors connected in series is electrically connected to the first end of the radio frequency antenna 300, and the end of the first group of multiple capacitors connected in series is grounded, and the first voltage receiving node 231 is located between two adjacent capacitors in the first group of multiple capacitors connected in series; the first end of the second group of multiple capacitors connected in series is electrically connected to the second end of the radio frequency antenna 300, and the end of the second group of multiple capacitors connected in series is grounded, and the second voltage receiving node 232 is located between two adjacent capacitors in the second group of multiple capacitors connected in series.

[0068] The above-described optional implementation is applicable to scenarios where the RF antenna 300 is a differential antenna. In the case of a differential antenna, the RF communication module 200 can receive the antenna voltage signal at the first end and the antenna voltage signal at the second end of the RF antenna 300 through its two signal receiving terminals 220 (i.e., the first signal receiving terminal 221 and the second signal receiving terminal 222, corresponding to the positive and negative terminals of the differential signal, respectively) and two receiving units 20 (i.e., the first receiving unit 21 and the second receiving unit 22), respectively. The RF communication module 200 can further perform differential processing on the antenna voltage signals at the first and second ends of the RF antenna 300 to obtain differential voltage signals for subsequent use.

[0069] In the above optional embodiments, the capacitor assembly 11 may include two sets of multiple capacitors connected in series, corresponding to the first end and the second end of the radio frequency antenna 300, respectively. The first receiving unit 21 can draw power from the first voltage receiving node 231 between two adjacent capacitors in the first set of multiple capacitors (that is, obtain the antenna voltage signal corresponding to the first end of the radio frequency antenna 300), and the second receiving unit 22 can draw power from the second voltage receiving node 232 between two adjacent capacitors in the second set of multiple capacitors (that is, obtain the antenna voltage signal corresponding to the second end of the radio frequency antenna 300).

[0070] It is understood that, through the optional circuit structure described above in this embodiment, the capacitor assembly 11 is designed to include two sets of multiple capacitors connected in series, and the first receiving unit 21 is electrically connected between the first signal receiving end 221 and the first voltage receiving node 231, and the second receiving unit 22 is electrically connected between the second signal receiving end 222 and the second voltage receiving node 232. The first voltage receiving node 231 is located between two adjacent capacitors in the first set of multiple capacitors connected in series, and the second voltage receiving node 232 is located between two adjacent capacitors in the second set of multiple capacitors connected in series. Therefore, the antenna voltage signals received by the first receiving unit 21 and the second receiving unit 22 respectively can be effectively reduced, so that the antenna voltage signals received by the first signal receiving end 221 and the second signal receiving end 222 transmitted to the RF communication module 200 can better meet the required input dynamic range. Therefore, it can better adapt to the needs of the current differential antenna form of RF antenna 300 for larger area and more turns, and reduce the risk of decoding errors or even hardware damage in the RF communication module 200. Furthermore, at least one capacitor in each series of capacitors can be reused to perform DC removal on the antenna voltage signal received by the receiving unit 20 (such as the first receiving unit 21 or the second receiving unit 22), thereby reducing the number of DC blocking capacitors in the receiving unit 20 (such as the first receiving unit 21 or the second receiving unit 22), which in turn reduces the hardware implementation cost of the signal receiving circuit 100.

[0071] Furthermore, in the above optional circuit structure, by reasonably selecting the number of capacitors in each group of multiple capacitors connected in series, the capacitance value of each capacitor, and the power extraction position (i.e., the position of the first voltage receiving node 231 and the second voltage receiving node 232), the magnitude of the antenna voltage signal received by the receiving unit 20 (such as the first receiving unit 21 and the second receiving unit 22) can be flexibly adjusted, thereby flexibly meeting the input dynamic range requirements of the signal receiving end 220 (such as the first signal receiving end 221 and the second signal receiving end 222) of the radio frequency communication module 200.

[0072] In the above optional embodiments, each group of capacitors connected in series in the capacitor assembly 11 may include two or more capacitors. The same understanding can be found in the previous embodiments regarding "n capacitors". The number of capacitors in the two groups connected in series may be the same or different.

[0073] For example, in some alternative embodiments, refer to Figure 4 As shown, the first group of capacitors connected in series includes two capacitors, and the second group of capacitors connected in series also includes two capacitors.

[0074] That is, in this optional embodiment, referring to Figure 4 As shown, the first receiving unit 21 can be directly electrically connected between the second end of the first capacitor (capacitor C211) and the first end of the second capacitor (capacitor C212) in the first group of two capacitors connected in series (e.g., capacitors C211 and C212), and the electrical connection point is the first voltage receiving node 231; in addition, the first end of capacitor C211 (that is, the first end of the two capacitors in the first group of series) is electrically connected to the first end of the radio frequency antenna 300, and the second end of capacitor C212 is grounded. The second receiving unit 22 can be directly electrically connected between the second end of the first capacitor (capacitor C221) and the first end of the second capacitor (capacitor C222) in the second group of two capacitors connected in series (e.g., capacitors C221 and C222), and the electrical connection point is the second voltage receiving node 232; in addition, the first end of capacitor C221 (that is, the first end of the two capacitors in the second group of series) is electrically connected to the second end of the radio frequency antenna 300, and the second end of capacitor C222 is grounded. This optional embodiment can also be understood by referring to the relevant embodiments regarding "n=2" mentioned above.

[0075] Based on this, in this embodiment of the application, an optional circuit structure is used where the first group of multiple capacitors connected in series includes two capacitors, and the second group of multiple capacitors connected in series also includes two capacitors. This allows the first voltage receiving node 231 to be located between the two capacitors in the first group, and the second voltage receiving node 232 to be located between the two capacitors in the second group. Therefore, the antenna voltage signals received by the first receiving unit 21 and the second receiving unit 22 are effectively reduced, ensuring that the antenna voltage signals received by the first signal receiving end 221 and the second signal receiving end 222 of the RF communication module 200 better meet the required input dynamic range. This better adapts to the larger area and more turns requirements of the current differential antenna form of the RF antenna 300, reducing the risk of decoding errors or even hardware damage in the RF communication module 200. Furthermore, the above circuit structure is relatively simple and efficient, saves on the number of capacitors, has lower hardware costs, and helps reduce the layout area. In addition, each group of two capacitors connected in series can have one capacitor (e.g., Figure 4 The capacitors C211 and C221 in the signal receiving unit 20 can be reused to perform DC removal on the antenna voltage signal received by the receiving unit 20 (such as the first receiving unit 21 or the second receiving unit 22), thereby reducing the number of DC blocking capacitors in the receiving unit 20 (such as the first receiving unit 21 or the second receiving unit 22), which can reduce the hardware implementation cost of the signal receiving circuit 100.

[0076] Furthermore, in the above optional circuit structure, by reasonably selecting the capacitance value of each of the two capacitors, the magnitude of the antenna voltage signal received by the receiving unit 20 can be flexibly adjusted, thereby flexibly meeting the input dynamic range requirements of the signal receiving end 220 of the radio frequency communication module 200.

[0077] In some alternative embodiments, refer to Figure 4 As shown, the signal transmitting end 210 of the radio frequency communication module 200 includes a first signal transmitting end 211 (such as TXP) and a second signal transmitting end 212 (such as TXN); the matching unit 10 also includes a first impedance matching sub-circuit 131 and a second impedance matching sub-circuit 132; wherein, the first impedance matching sub-circuit 131 is electrically connected between the first signal transmitting end 211 and the first end of a first group of multiple capacitors connected in series (such as the first end of capacitor C211); the second impedance matching sub-circuit 132 is electrically connected between the second signal transmitting end 212 and the first end of a second group of multiple capacitors connected in series (such as the first end of capacitor C221).

[0078] Based on this, in this embodiment, the first impedance matching sub-circuit 131, electrically connected between the first signal transmitting terminal 211 and the first end of the first group of multiple capacitors connected in series, can effectively match the impedance of the first signal transmitting terminal 211 of the RF communication module 200 and the first end of the RF antenna 300. Similarly, the second impedance matching sub-circuit 132, electrically connected between the second signal transmitting terminal 212 and the first end of the second group of multiple capacitors connected in series, can effectively match the impedance of the second signal transmitting terminal 212 of the RF communication module 200 and the second end of the RF antenna 300. This ensures that the driving signal energy of both the first signal transmitting terminal 211 and the second signal transmitting terminal 212 can be transmitted efficiently, thereby guaranteeing the driving effect of the RF communication module 200 on the RF antenna 300 and improving RF communication performance.

[0079] Optionally, refer to Figure 4 As shown, the first impedance matching sub-circuit 131 may include an inductor L01, a capacitor C11, and a capacitor C01; wherein, the first end of the inductor L01 is electrically connected to the first signal transmitting terminal 211, and the second end of the inductor L01 is electrically connected to the first end of the capacitor C11; the first end of the capacitor C01 is electrically connected to the second end of the inductor L01, and the second end of the capacitor C01 is grounded; the second end of the capacitor C11 is connected to the first end of the first group of multiple capacitors connected in series (e.g., ...). Figure 4 The first terminal of capacitor C211 is electrically connected. Optionally, refer to... Figure 4As shown, the second impedance matching sub-circuit 132 may include an inductor L02, a capacitor C12, and a capacitor C02; wherein, the first end of the inductor L02 is electrically connected to the second signal transmitting terminal 212, and the second end of the inductor L02 is electrically connected to the first end of the capacitor C12; the first end of the capacitor C02 is electrically connected to the second end of the inductor L02, and the second end of the capacitor C02 is grounded; the second end of the capacitor C12 is connected to the first end of the second group of multiple capacitors connected in series (e.g., ...). Figure 4 The first terminal of capacitor C221 in the circuit is electrically connected. It should be understood that such an optional circuit structure can effectively realize the impedance matching function of the first impedance matching sub-circuit 131 and the second impedance matching sub-circuit 132.

[0080] In other alternative embodiments, other circuit structures can also be selected to implement the first impedance matching sub-circuit 131 and the second impedance matching sub-circuit 132, as long as they meet the requirements. This application does not impose any restrictions on this.

[0081] In some alternative embodiments, refer to Figure 2 , Figure 3 , Figure 4 As shown, the matching unit 10 also includes at least one first resistor R1; the first ends of each group of multiple capacitors connected in series are electrically connected to the radio frequency antenna 300 through the first resistor R1.

[0082] Based on this, in the above optional embodiments, the first ends of each group of multiple capacitors connected in series are electrically connected to the radio frequency antenna 300 through the first resistor R1. The first resistor R1 can effectively reduce the quality factor of the radio frequency antenna, thereby widening the bandwidth to meet the requirements of radio frequency communication.

[0083] For example, refer to Figure 2 , Figure 3 In the example shown, the capacitor assembly 11 of the matching unit 10 includes a group of multiple capacitors connected in series. The matching unit 10 also includes a first resistor R1. The first end of the group of multiple capacitors connected in series (i.e., the first capacitor) The first end of the antenna 300 (which can be a single-ended antenna) can be electrically connected to the first end of the RF antenna 300 through the first resistor R1, and the second end of the RF antenna 300 is grounded.

[0084] For example, refer to Figure 4 As shown, the capacitor assembly 11 of the matching unit 10 may include two sets of capacitors connected in series, namely, a first set of capacitors connected in series and a second set of capacitors connected in series; the matching unit 10 also includes two first resistors R1; then the first end of the first set of capacitors connected in series (i.e. Figure 4The first terminal of capacitor C211 is electrically connected to the first terminal of RF antenna 300 (which can be a differential antenna) through a first resistor R1. The first terminal of the second group of capacitors connected in series (i.e. Figure 4 The first terminal of capacitor C221 is electrically connected to the second terminal of RF antenna 300 through another first resistor R1. It should be understood that the resistance values ​​of the two first resistors R1 can be set according to actual needs, and can be the same or different.

[0085] In some alternative embodiments, refer to Figure 2 , Figure 3 , Figure 4 As shown, the receiving unit 20 may include a second resistor R2, which is electrically connected between the signal receiving terminal 220 and the voltage receiving node 230 of the radio frequency communication module 200; wherein, the second resistor R2 is connected to a variable attenuation resistor inside the radio frequency communication module 200. The resistor divider circuit is formed, and the receiving unit 20 receives the antenna voltage signal from the voltage receiving node 230 through the second resistor R2 in the resistor divider circuit.

[0086] A variable attenuation resistor can be installed inside the radio frequency communication module 200. The variable attenuation resistor Electrically connected to signal receiver 220, it is used to adjust the amplitude of the signal entering signal receiver 220, ensuring it falls within the input dynamic range of signal receiver 220. However, the variable attenuation resistor... There is a minimum value limit; that is, when the antenna voltage signal generated by the RF antenna 300 is too large, the variable attenuation resistor alone cannot compensate. The attenuation effect may not be sufficient to reduce the signal amplitude to the required range.

[0087] In this embodiment, the second resistor R2 of the receiving unit 20 is electrically connected between the voltage receiving node 230 and the signal receiving terminal 220 of the radio frequency communication module 200. The second resistor R2 can be connected to a variable attenuation resistor. Together they form a resistor voltage divider circuit, thereby allowing the receiving unit 20 to obtain the antenna voltage signal from the voltage receiving node 230. via the second resistor R2 and the variable attenuation resistor After the resistor divider, the voltage at the signal receiving terminal 220 of the RF communication module 200 is... The following relationship must be satisfied:

[0088] Therefore, in this embodiment of the application, the receiving unit 20 with the second resistor R2 is connected to the variable attenuation resistor inside the radio frequency communication module 200. A resistor divider circuit is formed, so that the receiving unit 20 can receive the antenna voltage signal from the voltage receiving node 230 through the second resistor R2 in the resistor divider circuit. This effectively makes the signal amplitude entering the signal receiving end 220 of the RF communication module 200 better meet the input dynamic range requirements, reducing the risk of decoding errors or hardware damage to the RF communication module 200 due to excessive input signals.

[0089] For example, refer to Figure 2 , Figure 3 As shown, the signal receiver 220 (e.g., RXP) of the RF communication module 200 can be electrically connected to a variable attenuation resistor inside the RF communication module 200. For example, the first signal receiving terminal 221 (e.g., RXP) and the second signal receiving terminal 222 (e.g., RXN) of the RF communication module 200 can be electrically connected to a variable attenuation resistor inside the RF communication module 200. It should be understood that the resistance value of the second resistor R2 can be flexibly selected according to engineering needs, and this application embodiment does not impose any restrictions on this.

[0090] It is understood that the foregoing description of the signal receiving circuit 100 is merely an illustrative example of this application and is not intended to limit this application in any way.

[0091] According to a second aspect of the embodiments of this application, a radio frequency communication device is provided. (Refer to...) Figure 1 As shown, the radio frequency communication device 1000 may include: a radio frequency communication module 200, a radio frequency antenna 300, and a signal receiving circuit 100 as described in any one of the first aspects.

[0092] The radio frequency communication device 1000 in this application embodiment has been described in detail in the previous embodiments. Therefore, its related content and beneficial effects can be understood by referring to the above embodiments, and will not be repeated here.

[0093] According to a third aspect of the embodiments of this application, an electronic device is provided. (Refer to...) Figure 5 As shown, the electronic device 2000 may include: a radio frequency communication device 1000 as described in the second aspect.

[0094] It should be noted that, depending on the implementation needs, the various components / steps described in the embodiments of this application can be broken down into more components / steps, or two or more components / steps or parts of the operation of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of this application.

[0095] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this application.

[0096] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc., mentioned in this application are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies. It should be noted that the modifications "a" and "a plurality" mentioned in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless explicitly stated in the context, they should be understood as "one or more".

[0097] The above embodiments are only used to illustrate the embodiments of this application, and are not intended to limit the embodiments of this application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of this application. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of this application, and the patent protection scope of the embodiments of this application should be defined by the claims.

Claims

1. A signal receiving circuit, characterized in that, include: A matching unit is electrically connected between the signal transmitting end of the radio frequency communication module and the radio frequency antenna, and is configured to perform impedance matching between the signal transmitting end of the radio frequency communication module and the radio frequency antenna. The receiving unit is electrically connected between the signal receiving end and the voltage receiving node of the radio frequency communication module, and is configured to receive the antenna voltage signal from the voltage receiving node and transmit the antenna voltage signal to the signal receiving end. The matching unit includes a capacitor assembly connected in parallel with the radio frequency antenna. The capacitor assembly includes at least one set of multiple capacitors connected in series. The first end of the at least one set of multiple capacitors connected in series is electrically connected to the radio frequency antenna, and the end of the set of multiple capacitors connected in series is grounded. The voltage receiving node is located between two adjacent capacitors in the multiple capacitors connected in series.

2. The signal receiving circuit according to claim 1, characterized in that, The capacitor assembly includes a set of n capacitors connected in series, where n ≥ 2 and n is an integer; Of the n capacitors: the second end of the kth capacitor is electrically connected to the first end of the (k+1)th capacitor, the first end of the 1st capacitor forms the head end and is electrically connected to the first end of the radio frequency antenna, the second end of the nth capacitor forms the tail end and is electrically connected to the second end of the radio frequency antenna, and the second end of the nth capacitor is grounded, where 1≤k≤n-1 and k is an integer; The receiving unit is electrically connected to a voltage receiving node between the second end of one pair of adjacent k-th capacitors and the first end of the (k+1)-th capacitor.

3. The signal receiving circuit according to claim 2, characterized in that, The capacitor assembly includes a set of two capacitors connected in series, wherein: The first terminal of the first capacitor is electrically connected to the first terminal of the radio frequency antenna, the second terminal of the first capacitor is electrically connected to the first terminal of the second capacitor, the second terminal of the second capacitor is electrically connected to the second terminal of the radio frequency antenna, and the second terminal of the second capacitor is grounded. The receiving unit is electrically connected to a voltage receiving node between the second end of the first capacitor and the first end of the second capacitor.

4. The signal receiving circuit according to claim 2, characterized in that, The signal transmitting end of the radio frequency communication module includes a first signal transmitting end and a second signal transmitting end; The matching unit further includes a harmonic suppression sub-circuit and an impedance matching sub-circuit. The first signal transmitting end and the second signal transmitting end are both electrically connected to the harmonic suppression sub-circuit, and the harmonic suppression sub-circuit is electrically connected to the first end through the impedance matching sub-circuit.

5. The signal receiving circuit according to claim 1, characterized in that, The signal receiving end of the radio frequency communication module includes a first signal receiving end and a second signal receiving end; The receiving unit includes a first receiving unit and a second receiving unit, and the voltage receiving node includes a first voltage receiving node and a second voltage receiving node. The first receiving unit is electrically connected between the first signal receiving terminal and the first voltage receiving node, and the second receiving unit is electrically connected between the second signal receiving terminal and the second voltage receiving node; The capacitor assembly includes a first group of multiple capacitors connected in series and a second group of multiple capacitors connected in series. The first end of the first group of multiple capacitors connected in series is electrically connected to the first end of the radio frequency antenna, and the end of the first group of multiple capacitors connected in series is grounded. The first voltage receiving node is located between two adjacent capacitors in the first group of multiple capacitors connected in series. The first end of the second group of capacitors connected in series is electrically connected to the second end of the radio frequency antenna, and the end of the second group of capacitors connected in series is grounded. The second voltage receiving node is located between two adjacent capacitors in the second group of capacitors connected in series.

6. The signal receiving circuit according to claim 5, characterized in that, include: The first group of capacitors connected in series includes two capacitors, and the second group of capacitors connected in series also includes two capacitors.

7. The signal receiving circuit according to claim 5, characterized in that, The signal transmitting end of the radio frequency communication module includes a first signal transmitting end and a second signal transmitting end; The matching unit further includes a first impedance matching sub-circuit and a second impedance matching sub-circuit; wherein... The first impedance matching sub-circuit is electrically connected between the first signal transmitting end and the first end of the first group of multiple capacitors connected in series; The second impedance matching sub-circuit is electrically connected between the second signal transmitting end and the first end of the second group of multiple capacitors connected in series.

8. The signal receiving circuit according to any one of claims 1-7, characterized in that, The matching unit further includes at least one first resistor; The first ends of each group of capacitors connected in series are electrically connected to the radio frequency antenna through a first resistor.

9. The signal receiving circuit according to any one of claims 1-7, characterized in that, The receiving unit includes a second resistor, which is electrically connected between the signal receiving end and the voltage receiving node of the radio frequency communication module. The second resistor and the variable attenuation resistor inside the radio frequency communication module form a resistor voltage divider circuit. The receiving unit receives the antenna voltage signal from the voltage receiving node through the second resistor in the resistor voltage divider circuit.

10. The signal receiving circuit according to any one of claims 1-7, characterized in that, The radio frequency communication module is an NFC communication module, and the radio frequency antenna is an NFC antenna.

11. A radio frequency communication device, characterized in that, include: The radio frequency communication module, the radio frequency antenna, and the signal receiving circuit as described in any one of claims 1-10.

12. An electronic device, characterized in that, include: The radio frequency communication device as described in claim 11.

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