CN111741149A

CN111741149A - Electronic equipment

Info

Publication number: CN111741149A
Application number: CN202010565183.7A
Authority: CN
Inventors: 易伟
Original assignee: Shanghai Awinic Technology Co Ltd
Current assignee: Shanghai Awinic Technology Co Ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2020-10-02

Abstract

The invention provides an electronic device, which comprises an NFC antenna, an NFC circuit and an antenna circuit, wherein the NFC antenna has the function of receiving FM signals, and the antenna circuit comprises: at least one FM signal isolation circuit, and an FM signal amplification circuit. The input end of the FM frequency modulation signal amplifying circuit is connected with any one end of the NFC antenna, the output end of the FM frequency modulation signal amplifying circuit is connected with the preset frequency modulation chip, and the FM frequency modulation signal amplifying circuit is used for transmitting the frequency modulation signal to the preset frequency modulation chip after receiving the frequency modulation signal acquired by the NFC antenna. One end of the FM frequency modulation signal isolation circuit is connected with both ends of the NFC antenna and used for isolating the FM frequency modulation signal to be transmitted to the ground or the NFC circuit. The electronic equipment provided by the scheme can be seen, the external antenna does not need to be additionally installed, the development trend of high screen occupation ratio of the electronic equipment is met, and the receiving function of frequency modulation signals can be realized.

Description

Electronic equipment

Technical Field

The invention relates to the technical field of circuits, in particular to electronic equipment.

Background

At present, the development trend of electronic devices is high screen occupation ratio and light and thin, which gradually reduces the usable area of signal antennas, however, in some areas (such as africa, ramei, north america, japan, korea, south east asia, etc.), functional requirements such as radios, digital televisions, etc. still exist, so how to provide an electronic device, which can meet the development trend of high screen occupation ratio of electronic devices and can also realize the reception of frequency modulation signals, is a great technical problem to be solved by technicians in the field.

Disclosure of Invention

In view of this, embodiments of the present invention provide an electronic device, which can meet the development trend of high screen ratio of electronic devices and can receive frequency modulation signals.

In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

an electronic device includes an NFC antenna, an NFC circuit, and an antenna circuit, the NFC antenna having a function of receiving an FM frequency modulation signal, the antenna circuit including: at least one FM signal isolation circuit and an FM signal amplification circuit;

the input end of the FM frequency modulation signal amplifying circuit is connected with any end of the NFC antenna, the output end of the FM frequency modulation signal amplifying circuit is connected with a preset frequency modulation chip, and the FM frequency modulation signal amplifying circuit is used for transmitting the frequency modulation signal to the preset frequency modulation chip after receiving the frequency modulation signal acquired by the NFC antenna;

one end of the FM frequency modulation signal isolation circuit is connected with both ends of the NFC antenna and used for isolating the FM frequency modulation signal to be transmitted to the ground or the NFC circuit.

Optionally, the antenna circuit includes at least two FM frequency modulation signal isolation circuits;

one FM frequency modulation signal isolation circuit's one end links to each other with the one end of NFC antenna for keep apart the FM signal transmission to ground that the NFC antenna received, another FM frequency modulation signal isolation circuit links to each other with the other end of NFC antenna, is used for keeping apart the FM signal transmission that the NFC antenna received extremely the NFC circuit.

Optionally, the NFC circuit includes an LC filter circuit, a matching circuit, and a transformer;

the NFC chip is connected with the matching circuit through the LC filter circuit, the matching circuit is connected with one side of the transformer, and the transformer comprises at least two connecting ports;

one of the connection ports of the transformer is connected with one end of the FM signal isolation circuit.

Optionally, the FM frequency modulation signal isolation circuit includes: a first inductor and a first capacitor, wherein the first capacitor is connected to the first inductor,

the first end of the first inductor is connected with the first end of the first capacitor and serves as the input end of the FM signal isolation circuit, and the input end of the FM signal isolation circuit is connected with the connecting port;

and the second end of the first inductor is connected with the second end of the first capacitor and serves as the output end of the FM signal isolation circuit, and the output end of the FM signal isolation circuit is connected with the ground.

Optionally, the FM modulation signal amplifying circuit includes a first inductor bank, a second capacitor, a low noise amplifier, and a first capacitor bank,

the first end of the first inductance group is used as the input end of the FM signal amplifying circuit, the second end of the first inductance group is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected with the first end of the first capacitor group, and the second end of the first capacitor group is used as the output end of the FM signal amplifying circuit.

Optionally, the first inductor group includes a second inductor, a third inductor and a fourth inductor,

the first end of the second inductor is used as the input end of the first inductor group, the second end of the second inductor is connected with the first end of the third inductor and the first end of the fourth inductor, the second end of the third inductor is used as the output end of the first inductor group, and the second end of the fourth inductor is grounded.

Optionally, the first capacitor bank includes a third capacitor and a fourth capacitor,

and the first end of the third capacitor is used as the input end of the first capacitor bank, the second end of the third capacitor is connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is used as the output end of the first capacitor bank.

Optionally, the FM frequency modulation signal isolation circuit includes: the magnetic beads have impedance larger than a first preset impedance value under a preset frequency;

the first end of the magnetic bead is used as the input end of the FM signal isolation circuit, and the second end of the magnetic bead is used as the output end of the FM signal isolation circuit.

Optionally, the preset frequency is 100MHz, and the first preset impedance value is 1000 Ω.

Optionally, the inductance of the first inductor is 120nH, and the capacity of the first capacitor is 22 pF.

Based on the above technical solution, the present invention provides an electronic device, which includes an NFC circuit and an antenna circuit, wherein the NFC circuit includes an LC filter circuit, a matching circuit, and a transformer, and the antenna circuit includes: FM signal isolation circuit and FM signal amplifier circuit. The NFC chip is connected with the matching circuit through the LC filter circuit, the matching circuit is connected with one side of the transformer, and the transformer comprises at least two connecting ports. A connection port of the transformer is connected with the input end of the FM signal isolation circuit, the output end of the FM signal isolation circuit is connected with one end of the NFC antenna and the input end of the FM signal amplification circuit, the other end of the NFC antenna is connected with the input end of the FM signal isolation circuit on another ground, and the output end of the FM signal isolation circuit is grounded. The output end of the FM signal amplifying circuit is connected with the preset frequency modulation chip and used for transmitting the FM signal to the preset frequency modulation chip. The electronic equipment provided by the scheme can be seen, the external antenna does not need to be additionally installed, the development trend of high screen occupation ratio of the electronic equipment is met, and the receiving function of frequency modulation signals can be realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a circuit diagram of an antenna circuit provided in the prior art;

fig. 2 is a circuit diagram of another antenna circuit provided in the prior art;

fig. 3 is a schematic diagram of an antenna circuit according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of an FM signal isolation circuit in an antenna circuit according to an embodiment of the invention;

fig. 5 is a schematic circuit diagram of an FM frequency modulation signal amplifying circuit in an antenna circuit according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a first inductor set in an antenna circuit according to an embodiment of the present invention;

fig. 7 is a schematic circuit diagram of a first capacitor bank in an antenna circuit according to an embodiment of the present invention;

fig. 8 is a schematic circuit diagram of an electronic device according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a Type-C line according to an embodiment of the present invention;

FIG. 10 is a signal drawing schematic of a Type-C line provided in FIG. 9;

fig. 11 is a circuit diagram of another electronic device according to an embodiment of the invention;

fig. 12 is a circuit schematic diagram of another electronic device according to an embodiment of the invention.

Detailed Description

In combination with the background art, the electronic device tends to have a high screen occupation ratio and a light and thin structure, and the built-in wire occupies the space of the electronic device, so that the built-in signal antenna is gradually replaced, but some areas still have the receiving requirement of the fm signal, such as the electronic device has the functions of a radio, a digital television, and the like.

Therefore, how to implement the function of receiving the frequency modulation signal by using the existing interface or peripheral device of the electronic device without using an additional antenna is a major technical problem to be solved by those skilled in the art.

In order to solve the above technical problem, currently, as shown in fig. 1, some electronic devices utilize an earphone cable as a receiving antenna, and the earphone cable has a long size, so that the antenna circuit can have a good low-frequency antenna receiving effect.

Besides, as shown in fig. 2, an external whip antenna may be used, and when a frequency modulation function is required, an external wire is connected to the electronic device, which may require an interface for connecting the external antenna to be reserved in the electronic device.

The inventor finds that with the popularization of bluetooth headsets and type-c interfaces, more and more electronic devices eliminate a separate 3.5mm headset jack and an external antenna interface. Therefore, on the basis of the electronic devices, as shown in fig. 3, the present invention provides an antenna circuit, which is applied to an electronic device, wherein at least one component in the electronic device has a predetermined first function and a second function of receiving a frequency modulation signal, the component corresponds to the predetermined circuit in the electronic device, and the component provides one or more connection ports (internal connection ports of the electronic device) to connect with the antenna circuit. The antenna circuit 30 includes: at least one FM frequency modulation signal isolation circuit 31, and an FM frequency modulation signal amplification circuit 32.

Specifically, an input end a of the FM frequency modulation signal amplifying circuit 32 is connected to one of the connection ports 33, an output end B of the FM frequency modulation signal amplifying circuit 32 is connected to the preset frequency modulation chip 34, and the FM frequency modulation signal amplifying circuit 32 is configured to transmit a frequency modulation signal to the preset frequency modulation chip 34 after receiving the frequency modulation signal transmitted by the component.

For any one of the FM frequency modulation signal isolation circuits 31, one end thereof is connected to a connection port, and the other end thereof is connected to the ground 35 or a preset circuit, and the FM frequency modulation signal isolation circuit 31 is configured to isolate a preset frequency signal.

It should be noted that, in an alternative, the connection port 33 may be a ground pin (or referred to as a ground pin), and when the connection port is a ground pin, the ground pin refers to an original ground pin of the electronic component, and in the prior art, the ground pins are directly grounded, and in this embodiment, the ground pins are grounded through the FM signal isolation circuit 31.

In this embodiment, the FM frequency modulation signal isolation circuit 31 in the antenna circuit may be one or more, the FM frequency modulation signal isolation circuit 31 plays a role of isolating the FM frequency modulation signal from the ground or a preset circuit, and accordingly, the connection port may be a ground pin or a port of the component.

Further, the FM frequency modulation signal isolation circuit 31 corresponds to the connection ports provided by the component in a one-to-one manner, that is, one FM frequency modulation signal isolation circuit 31 is connected to each connection port, and the FM frequency modulation signal isolation circuit 31 is connected to the ground or connected to a preset circuit.

As can be seen, in the antenna circuit provided in the embodiment of the present invention, the FM signal isolation circuit 31 is disposed between the ground and an internal connection port of the electronic device, such as a ground pin, and the FM signal isolation circuit 31 is used to block the transmission of the preset frequency signal on the pin to the ground. Meanwhile, the FM signal amplifier circuit 32 is disposed between the connection port 33 and the preset FM chip 34, so that the FM signal can be transmitted to the preset FM chip 34 through the FM signal amplifier circuit 32, and the preset FM chip 34 analyzes the received FM signal, thereby implementing the function of receiving the FM signal.

By combining the antenna circuit provided by the embodiment of the invention, it can be seen that the scheme does not need to adopt an earphone interface and an external antenna interface, and can realize the reception of the frequency modulation signal only by that a certain electronic component in the electronic equipment has a preset first function and a second function of receiving the frequency modulation signal, thereby reducing the interface requirement on the electronic equipment.

On the basis of the above embodiments, the embodiments of the present invention further provide several specific implementation circuits of the FM frequency modulation signal isolation circuit, as follows:

in a first mode

As shown in fig. 4, the FM-signal isolating circuit 31 may include: a first inductor 41 and a first capacitor 42.

Specifically, the connection relationship of each device in the FM modulation signal isolation circuit 31 is as follows:

a first end of the first inductor 41 is connected to a first end of the first capacitor 42, and serves as an input end of the FM modulation signal isolation circuit 31, and an input end of the FM modulation signal isolation circuit 31 is connected to the connection port, for example, a ground pin.

The second end of the first inductor 41 is connected to the second end of the first capacitor 42, and serves as the output end of the FM frequency modulation signal isolation circuit 31, and the output end of the FM frequency modulation signal isolation circuit 31 is connected to ground.

It can be seen that in the present solution, the first inductor 41 is connected in parallel with the first capacitor 42, one common intersection point after the parallel connection is used as the input end of the FM frequency modulation signal isolation circuit 31, the other common intersection point after the parallel connection is used as the output end of the FM frequency modulation signal isolation circuit 31, and then the first inductor 41 and the first capacitor 42 after the parallel connection block the circulation between the preset frequency signal on the connection port of the electronic device and the ground 43.

It should be noted that, in the present FM-signal isolating circuit 31, since the first inductor 41 and the first capacitor 42 are connected in parallel, the first inductor 41 and the first capacitor 42 have two common intersections, and in this embodiment, one of the common intersections is defined as the input terminal of the FM-signal isolating circuit 31, and the other common intersection is defined as the output terminal of the FM-signal isolating circuit 31.

Specifically, in the present embodiment, the setting parameters of the first inductor 41 and the first capacitor 42 are further defined, for example, the inductance of the first inductor may be 120nH, and the capacitance of the first capacitor may be 22 pF. Of course, this embodiment provides only one preferred embodiment, and in the present invention, the inductance of the first inductor and the capacitance of the first capacitor are not limited to only one implementation manner described above, as long as the FM frequency modulation signal isolation circuit 31 can achieve the function of blocking the preset frequency signal.

Mode two

The embodiment of the present invention further provides another specific implementation circuit of the FM frequency modulation signal isolation circuit 31, for example, a magnetic bead with impedance larger than a first preset impedance value at a preset frequency is selected as the FM frequency modulation signal isolation circuit 31.

Specifically, a first end of the magnetic bead is used as an input end of the FM frequency modulation signal isolation circuit 31, and a second end of the magnetic bead is used as an output end of the FM frequency modulation signal isolation circuit 31.

In the present embodiment, the FM frequency modulation signal isolation circuit 31 is used for isolating the preset frequency signal, and the purpose of isolating the preset frequency signal is to enable the frequency modulation signal to flow to the preset frequency modulation chip 34 through the FM frequency modulation signal amplification circuit 32, and the preset frequency modulation chip 34 analyzes the received frequency modulation signal, so as to implement the function of receiving the frequency modulation signal.

Therefore, in this embodiment, the parameters of the magnetic bead are further defined, for example, the magnetic bead may be a magnetic bead with an impedance greater than a first preset impedance value (e.g. 1000 Ω) at a preset frequency of 100 MHz. Similarly, the parameters of the magnetic beads may be set according to actual design requirements, which are not described in detail herein.

On the basis of the foregoing embodiments, the embodiment of the present invention further provides a specific implementation circuit of the FM frequency modulation signal amplification circuit 32, as shown in fig. 5, the FM frequency modulation signal amplification circuit 32 includes a first inductor bank 51, a second capacitor 52, a low noise amplifier 53, and a first capacitor bank 54.

The connection relationship among the devices in the FM frequency modulation signal amplifying circuit 32 is as follows:

a first end of the first inductor bank 51 is used as an input end a of the FM frequency modulation signal amplifying circuit 32, a second end of the first inductor bank 52 is connected to a first end of the second capacitor 52, a second end of the second capacitor 52 is connected to an input end of the low noise amplifier 53, an output end of the low noise amplifier 53 is connected to a first end of the first capacitor bank 54, and a second end of the first capacitor bank 54 is used as an output end B of the FM frequency modulation signal amplifying circuit 32.

The operating principle of the FM frequency modulation signal amplifying circuit 32 is as follows:

as described above, the preset frequency signal on the connection port of the electronic device is blocked by the FM frequency modulation signal isolation circuit 31 so that the preset frequency signal cannot flow from the connection port of the electronic device to the ground. Meanwhile, as the FM frequency modulation signal amplification circuit 32 is arranged on a certain connection port, a signal path from the connection port of the electronic device to the preset frequency modulation chip 34 through the FM frequency modulation signal amplification circuit 32 is formed, that is, the preset frequency signal (frequency modulation signal) flows through the first inductance group 51 and the second capacitance 52, then the signal amplification is performed through the low noise amplifier 53, the amplified signal flows to the preset frequency modulation chip 34 through the first capacitance group 54, and finally the received frequency modulation signal is analyzed by the preset frequency modulation chip 34, so that the function of receiving the frequency modulation signal is realized.

Therefore, the antenna circuit provided by the scheme has the advantages that the FM signal on the pin is blocked from flowing to the ground through the FM signal isolation circuit, and the FM signal is transmitted to the preset FM chip through the FM signal amplification circuit, so that the function of receiving the FM signal is realized.

Specifically, the embodiment of the present invention further provides a specific implementation circuit of a first inductor group and a first capacitor group, as shown in fig. 6, the first inductor group 51 includes a second inductor 61, a third inductor 62, and a fourth inductor 64.

The connection relation of the inductors is as follows:

a first end of the second inductor 61 is used as the input end a of the first inductor group, a second end of the second inductor 61 is connected to a first end of the third inductor 62 and a first end of the fourth inductor 64, a second end of the third inductor 62 is used as the output end of the first inductor group, and a second end of the fourth inductor 64 is grounded.

The first inductor group and the second capacitor form a radio frequency impedance matching circuit, impedance matching is carried out on the frequency modulation signal, the signal subjected to impedance matching is output to a low noise amplifier, and the low noise amplifier is used for carrying out signal amplification on the input signal.

Specifically, the embodiment of the present invention further provides a specific implementation circuit of the first capacitor bank, as shown in fig. 7, the first capacitor bank 54 includes a third capacitor 71 and a fourth capacitor 72.

The connection relation of each capacitor is as follows:

a first end of the third capacitor 71 is used as an input end of the first capacitor bank, a second end of the third capacitor 71 is connected to a first end of the fourth capacitor 72, and a second end of the fourth capacitor 72 is used as an output end B of the first capacitor bank.

As can be seen from the above connection relationship, in this embodiment, the third capacitor and the fourth capacitor are connected in series. It should be noted that, in this embodiment, the first capacitor bank is a serial connection of the third capacitor and the fourth capacitor, and an original circuit of the electronic device is multiplexed, so that when the fm signal is not received, the first capacitor bank can also implement other functions. Therefore, preferably, in this embodiment, the first capacitor bank is configured to transmit the signal amplified by the low noise amplifier to the predetermined fm chip through the first capacitor bank in a manner that the third capacitor is connected in series with the fourth capacitor.

As described above, the antenna circuit provided by the embodiment of the present invention can be applied to an electronic device having at least one internal connection port, without providing an earphone interface and an external antenna interface for the electronic device. Specifically, on the basis of the above embodiment, as shown in fig. 8, the present embodiment further provides an electronic device, including any one of the above antenna circuits and a standard interface, where the standard interface is provided with at least one internal connection port, such as a ground pin. The antenna circuit is connected with the internal connection port and used for isolating a preset frequency signal to be transmitted to the ground and transmitting the frequency modulation signal to a preset frequency modulation chip. The working principle of the electronic device for implementing frequency modulation signal transmission refers to the working principle of the antenna circuit, and will not be described repeatedly herein. In this embodiment, the standard interface may be a type-c interface. In particular, the inventor considers that a connecting line of an electronic device, such as a type-c connecting line, is a peripheral of the electronic device that a user basically carries with him, and the physical length of the connecting line is also suitable for being used as an FM antenna, so as to receive a frequency modulation signal through a type-c interface of a component carried by the electronic device, therefore, the embodiment of the invention provides the electronic device, which comprises an interface transmission line, the antenna circuit and at least one grounding pin.

The antenna circuit comprises at least one FM signal isolation circuit and an FM signal amplification circuit;

the input end of the FM signal amplifying circuit is connected with one of the grounding pins, the output end of the FM signal amplifying circuit is connected with a preset frequency modulation chip, and the FM signal amplifying circuit is used for receiving the FM signal transmitted by the component and then transmitting the FM signal to the preset frequency modulation chip;

one end of each FM signal isolation circuit is connected with one grounding pin, the other end of each FM signal isolation circuit is connected with the ground, and the FM signal isolation circuits are used for isolating the FM signals.

Specifically, the interface transmission line is exemplified by a Type-C line, as shown in fig. 9, the interface transmission line is composed of an insulating plastic shell, a double-layer or single-layer shielding layer and a functional wire core, wherein the shielding layer wraps the functional wire core, the insulating plastic shell wraps the shielding layer, and the functional wire core is composed of a plurality of wire cores, which include a grounding wire core. Specifically, the signal lead-out of the interface transmission line is shown in fig. 10, which includes a ground terminal and a functional terminal.

Generally, when a user connects the interface transmission line to an electronic device, the shielding layer is necessarily connected to the terminal main ground, and the shielding layer of the charging line plays a role in shielding interference. Based on this, the embodiment of the present invention provides an electronic device, where a shielding layer in a multiplexing charging line is used as an FM antenna to implement receiving of a frequency modulation signal, and the received frequency modulation signal is transmitted to an FM frequency modulation signal amplifying circuit in an antenna circuit, so that the frequency modulation signal can flow to a preset frequency modulation chip through the FM frequency modulation signal amplifying circuit, and the preset frequency modulation chip analyzes the received frequency modulation signal to implement a function of receiving the frequency modulation signal, thereby obtaining a good FM channel searching effect.

In addition, an embodiment of the present invention further provides an electronic device, as shown in fig. 11, the electronic device includes an NFC circuit 101 and the above-mentioned antenna circuit, where the NFC circuit 101 includes an LC filter circuit 1011, a matching circuit 1012, and a transformer 1013, and the antenna circuit includes: an FM frequency modulation signal isolation circuit 1021, and an FM frequency modulation signal amplification circuit 1022.

The output end of one FM isolation circuit 1021 is connected to one end of the NFC antenna 104, and is configured to isolate the FM signal received by the NFC antenna from being transmitted to ground, and the other FM isolation circuit is connected to the other end of the NFC antenna 104, and is configured to isolate the FM signal received by the NFC antenna from being transmitted to the transformer 1013. The FM frequency modulation signal amplifying circuit 1022 is connected to any end of the NFC antenna 104, and is configured to receive a frequency modulation signal acquired by the NFC antenna and transmit the frequency modulation signal to the preset frequency modulation chip.

Specifically, the connection relationship of each device in the electronic device is as follows:

the NFC chip 103 is connected to the matching circuit 1012 through the LC filter circuit 1011, the matching circuit 1012 is connected to one side of the transformer 1013, and the transformer 1013 includes at least two connection ports.

One connection port of the transformer 1013 is connected to one end of an FM modulation signal isolation circuit 1021, the other end of the FM modulation signal isolation circuit 1021 is connected to one end of the NFC antenna 104 and the input end of the FM modulation signal amplification circuit 1022, the other end of the NFC antenna is connected to one end of another FM modulation signal isolation circuit, and the other end of the another FM modulation signal isolation circuit is grounded.

The input end of the FM frequency modulation signal amplifying circuit 1022 is connected to any end of the NFC antenna, and the output end is connected to the preset frequency modulation chip 105, and is configured to receive the frequency modulation signal acquired by the NFC antenna and transmit the frequency modulation signal to the preset frequency modulation chip.

In combination with the connection relationship of the circuit modules, the electronic device has the following working principle:

the inventor considers that the operating frequency band of NFC of the electronic device is 13.65MHz, and the frequency range of FM-modulated signals is usually 80MHz to 110MHz, so that the electronic device provided by the embodiment may utilize the NFC antenna included in the electronic device as a receiving antenna for FM-modulated signals.

Specifically, in the electronic device with the NFC function, the signal direction between the NFC chip 103 and the NFC antenna 104 is bidirectional, for example, the NFC chip 103 filters a generated signal through the LC filter circuit 1011, then impedance-matches the filtered signal through the matching circuit 1012, then the impedance-matched signal converts a double-ended signal into a single-ended signal through the transformer 1013, then the single-ended signal is transmitted to the NFC antenna 104, and the NFC antenna 104 transmits the signal. For another example, the NFC antenna 104 receives an NFC signal, converts the NFC signal into a double-ended signal through the transformer 1013, transmits the double-ended signal to the matching circuit 1012, performs impedance matching on the inverted signal through the matching circuit 1012, inputs the impedance-matched signal into the LC filter circuit 1011, performs filtering processing through the LC filter circuit 1011, outputs the signal to the NFC chip 103, and performs signal analysis by the NFC chip 103.

It should be noted that, in the present embodiment, the FM signal isolation circuit 1021 is disposed between one of the connection ports of the transformer 1013 and the NFC antenna 104, and is used for isolating the predetermined frequency signal. Meanwhile, an FM frequency modulation signal amplification circuit 1022 is disposed between the common connection point of the isolation circuit 1021 and the NFC antenna 104 and the preset frequency modulation chip 105, so that the frequency modulation signal acquired by the NFC antenna 104 can flow to the preset frequency modulation chip 105 through the FM frequency modulation signal amplification circuit 1022, and the preset frequency modulation chip 105 analyzes the received frequency modulation signal, thereby implementing a function of receiving the frequency modulation signal.

In addition, as shown in fig. 12, the electronic device further includes a wireless charging coil 111 and the antenna circuit, where the wireless charging coil 111 includes at least two signal connection terminals, such as a signal connection terminal a and a signal connection terminal b, and the antenna circuit includes: an FM signal amplifier circuit 1121 and at least two FM signal isolation circuits 1122.

The input end of the FM signal amplifying circuit is connected with one of the signal connecting ends, the output end of the FM signal amplifying circuit is connected with a preset frequency modulation chip, and the FM signal amplifying circuit is used for receiving the FM signal transmitted by the wireless charging coil and then transmitting the FM signal to the preset frequency modulation chip;

one end of each FM signal isolation circuit is connected with one signal connection end, the other end is connected with the input end of a preset wireless charging circuit, and the FM signal isolation circuit is used for isolating the FM signals flowing to the preset wireless charging circuit.

one signal connection end a of the wireless charging coil 111 is connected to an input end of one FM frequency modulation signal isolation circuit 1122, and an output end of the FM frequency modulation signal isolation circuit 1122 is connected to one input end of a preset wireless charging circuit 113;

the other signal connection end b of the wireless charging coil is connected to the input end of the other FM frequency modulation signal isolation circuit 1122 and the input end of the FM frequency modulation signal amplification circuit 1121, and the output end of the other FM frequency modulation signal isolation circuit 1122 is connected to another input end of the preset wireless charging circuit 113;

the output end of the FM frequency modulation signal isolation circuit 1122 is connected to the preset frequency modulation chip 114, and is configured to transmit the frequency modulation signal to the preset frequency modulation chip 114.

the inventor considers that the frequency of the wireless charging coil of the electronic device is 100-205 kHz, and the frequency range of the FM signal is usually 80-110 MHz, therefore, the electronic device provided by the embodiment can utilize the wireless charging coil included in the electronic device as the receiving antenna of the FM signal.

Specifically, the electronic device with wireless charging coil, this wireless charging coil include two signal connection end at least to contain two signal connection end in the picture as an example, in this embodiment, set up whole signal connection end with FM signal isolation circuit 1122, through the preset frequency signal on FM signal isolation circuit 1122 separation wireless charging coil's the signal connection end. Meanwhile, the FM signal amplifier 1121 is disposed between one signal connection end and the preset FM chip 114, so that the FM signal at the signal connection end can flow to the preset FM chip 114 through the FM signal amplifier 1121, and the preset FM chip 114 analyzes the received FM signal, thereby implementing the function of receiving the FM signal.

In summary, the present invention provides an antenna circuit and an electronic device, where the antenna circuit is applied to an electronic device, where at least one component in the electronic device has a first function and a second function of receiving a frequency modulation signal, the component provides one or more connection ports, and the component corresponds to a preset circuit in the electronic device, and the antenna circuit includes: at least one FM signal isolation circuit, and an FM signal amplification circuit. Specifically, the input end of the FM frequency modulation signal amplifying circuit is connected to one of the connection ports, the output end of the FM frequency modulation signal amplifying circuit is connected to the preset frequency modulation chip, and the FM frequency modulation signal amplifying circuit is configured to receive the frequency modulation signal transmitted by the component and transmit the frequency modulation signal to the preset frequency modulation chip. One end of each FM signal isolation circuit is connected with one connecting port, the other end of each FM signal isolation circuit is connected with the ground, and the FM signal isolation circuits are used for isolating FM signals. It is thus clear that this scheme provides an antenna circuit, need not additionally to install external antenna, has satisfied the development trend that electronic equipment high screen accounts for the ratio, can preserve frequency signal isolation again through FM frequency modulation signal isolating circuit, transmits frequency modulation signal to presetting the frequency modulation chip through FM frequency modulation signal amplifier circuit, realizes frequency modulation signal's receiving function.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electronic device, comprising an NFC antenna, an NFC circuit, and an antenna circuit, wherein the NFC antenna has a function of receiving FM frequency modulation signals, and wherein the antenna circuit comprises: at least one FM signal isolation circuit and an FM signal amplification circuit;

2. The electronic device of claim 1, wherein the antenna circuit comprises at least two FM frequency modulation signal isolation circuits;

3. The electronic device of claim 1, wherein the NFC circuit comprises an LC filter circuit, a matching circuit, and a transformer;

4. The electronic device of claim 1, wherein the FM frequency modulation signal isolation circuit comprises: a first inductor and a first capacitor, wherein the first capacitor is connected to the first inductor,

5. The electronic device of claim 1, wherein the FM signal amplification circuitry comprises a first set of inductors, a second capacitor, a low noise amplifier, and a first set of capacitors,

6. The electronic device of claim 5, wherein the first set of inductors comprises a second inductor, a third inductor, and a fourth inductor,

7. The electronic device of claim 5 or 6, wherein the first capacitor bank comprises a third capacitor and a fourth capacitor,

8. The electronic device of claim 1, wherein the FM frequency modulation signal isolation circuit comprises: the magnetic beads have impedance larger than a first preset impedance value under a preset frequency;

9. The electronic device of claim 8, wherein the predetermined frequency is 100MHz and the first predetermined impedance value is 1000 Ω.

10. The electronic device of claim 5, wherein the inductance of the first inductor is 120nH, and the capacitance of the first capacitor is 22 pF.