CN115102569A

CN115102569A - Radio frequency system, antenna switching method and electronic equipment

Info

Publication number: CN115102569A
Application number: CN202210706205.6A
Authority: CN
Inventors: 王泽卫
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-09-23

Abstract

A radio frequency system, an antenna switching method and an electronic device are provided, the radio frequency system includes a radio frequency transceiver, a first transceiving path, a second transceiving path, a first control circuit, a second control circuit and a switching control circuit, wherein: the first control circuit is configured to transmit a first control signal, wherein the first control signal is used for enabling transceiving functions of the first transceiving path and the second transceiving path; a second control circuit configured to transmit a second control signal, wherein the second control signal is used to enable an antenna switching operation; the switching control circuit is connected with the first control circuit and the second control circuit and used for receiving the first control signal and the second control signal and controlling one of the first transceiving path and the second transceiving path to be in switching connection with one of the first antenna and the second antenna according to the first control signal and the second control signal; the scheme can avoid the influence of transmission signal reflection on the power amplifier caused by instantaneous open circuit during antenna switching.

Description

Radio frequency system, antenna switching method and electronic equipment

Technical Field

The present disclosure relates to, but not limited to, wireless communication technologies, and more particularly, to a radio frequency system, an antenna switching method, and an electronic device.

Background

With the popularization of the internet of things technology, more and more scenes exist in which a user connects a router, a household appliance, a True Wireless Stereo (TWS) headset, a watch and the like by using a mobile phone. However, the gestures and scenes of the mobile phone used by the user are numerous, which results in that a single antenna cannot meet the user requirements, for example, the upper and lower antennas can be held in the process of horizontal holding, and the middle and lower antennas can be held in the process of vertical holding, so that various antenna switching technologies are provided to meet the requirements of different scenes. However, the use of antenna switching techniques also presents corresponding problems.

Disclosure of Invention

The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

An embodiment of the present application provides a radio frequency system, including:

a radio frequency transceiver;

one end of the first transceiving path is connected with the radio frequency transceiver, the other end of the first transceiving path is connected with the first antenna or the second antenna in a switchable manner, and the first transceiving path is used for transceiving a first radio frequency signal;

one end of the second transceiving path is connected with the radio frequency transceiver, the other end of the second transceiving path is connected to the first antenna or the second antenna in a switchable manner, and the second transceiving path is used for transceiving a second radio frequency signal;

a first control circuit, connected to the first transceiving path and the second transceiving path, configured to transmit a first control signal, wherein the first control signal is used to enable transceiving functions of the first transceiving path and the second transceiving path;

a second control circuit connected to the first transceiving path and the second transceiving path, configured to transmit a second control signal, wherein the second control signal is used to enable an antenna switching operation;

and the switching control circuit is connected with the first control circuit and the second control circuit and is used for receiving the first control signal and the second control signal and controlling one of the first transceiving path and the second transceiving path to be in switching connection with one of the first antenna and the second antenna according to the first control signal and the second control signal.

The embodiment of the present application further provides an antenna switching method, which is applied to the radio frequency system, and includes:

receiving the first control signal and the second control signal; wherein the first control signal is used for enabling transceiving functions of the first transceiving path and the second transceiving path, and the second control signal is used for enabling an antenna switching operation;

if the second control signal requests an antenna switching operation, judging whether the first transceiving channel and the second transceiving channel execute the transmitting operation of the radio frequency signal according to the first control signal;

and if the first transceiving path and the second transceiving path do not perform the transmission operation of the radio frequency signal, performing an antenna switching operation.

An embodiment of the present application further provides an electronic device including the radio frequency system according to any embodiment of the present application.

An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the antenna switching method is described above.

Compared with the prior art that the antenna switching operation is executed after the antenna switching operation request is received, according to the scheme provided by the application, when the second control signal is received to request the antenna switching, the transceiving states of the first transceiving path and the second transceiving path are determined according to the first control signal to judge whether the switching can be executed or not, so that the antenna switching and the radio frequency transmitting state cannot occur simultaneously, no reflection signal enters the PA, and the problem of the PA burning caused by the antenna switching transient open circuit is solved.

Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.

Drawings

The accompanying drawings are included to provide an understanding of the embodiments of the disclosure, and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the embodiments of the disclosure, do not constitute a limitation of the disclosure.

FIG. 1A is a block diagram of a radio frequency system;

FIG. 1B is a circuit diagram of the RF system shown in FIG. 1A;

fig. 2 is a first schematic diagram of a radio frequency system according to an embodiment of the present application;

FIG. 3 is a second schematic diagram of the RF system of FIG. 2;

FIG. 4 is a third schematic diagram of the RF system of FIG. 2;

FIG. 5 is a schematic diagram of an application of the RF system shown in FIG. 4;

FIG. 6 is a fourth schematic diagram of the RF system of FIG. 2;

FIG. 7 is a schematic diagram of an application of the RF system shown in FIG. 6;

fig. 8 is a flowchart of an antenna switching method according to an embodiment of the present application;

FIG. 9 is a timing diagram of signals provided by an embodiment of the present application;

FIG. 10 is a timing diagram of another embodiment of the present invention;

fig. 11 is a block diagram of an antenna switching apparatus according to an embodiment of the present application.

Detailed Description

The present disclosure describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described in the present disclosure.

Throughout the description of the present disclosure, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or illustrations. Any embodiment described in this disclosure as "exemplary" or "e.g.," should not be construed as preferred or advantageous over other embodiments. "and/or" herein is a description of an association relationship for an associated object, meaning that there may be three relationships, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. "plurality" means two or more than two. In addition, for the convenience of clearly describing the technical solutions of the embodiments of the present disclosure, the words "first", "second", and the like are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," and the like do not denote any order or importance, but rather the terms "first," "second," and the like do not denote any order or importance. In the description of the present disclosure, the connections between the radio frequency devices are all electrical connections, which may be direct connections or indirect connections.

In describing representative exemplary embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present disclosure.

A radio frequency system is provided, a switch is added between a Front-end module (FEM) and an antenna to realize intelligent selection of the antenna. As shown in fig. 1A, the transceiver includes a radio frequency transceiver 21, a first transceiving path 25, a switch 27, and a first antenna 29 and a second antenna 31, wherein: one end of the first transceiving path 25 is connected to the rf transceiver 21, and the other end is connected to the switch 27; the switch 27 is arranged to switchably connect the first transceiving path 25 to the first antenna 29 or the second antenna 31. The switching control signal for controlling the switch 27 to switch may be from an Application Processor (AP) or the rf transceiver 21.

The first radio frequency signal transmitted by the first transceiving channel can be a Bluetooth (BT) signal or a Wi-Fi signal. Two signals such as a first transceiving path for time-sharing transmission of Bluetooth signals and Wi-Fi signals can also be included. This embodiment has set up two at least antennas for the transmission and the receipt of first radio frequency signal, and two antennas can set up respectively at the both ends of electronic equipment, or one sets up in the middle part of electronic equipment and another branch sets up in one side of electronic equipment, can adapt to more scenes better, and when the position of one of them antenna was held or contacted, can switch to another antenna and communicate to promote the transmission quality of signal on the whole.

However, in this embodiment, the switch 27 is controlled to implement antenna switching in a hard switching manner, the switch 27 belongs to an open state in a switching transient state (about 500ns), and if the first radio frequency signal is in a transmission state at this time, the first radio frequency signal will be totally reflected back when reaching the switch 27, which may affect radio frequency devices inside the front end module, such as a Power Amplifier (PA), for example, shorten the service life of the PA, and burn out the PA.

Fig. 1B is a circuit diagram of an embodiment of a radio frequency system shared by bluetooth and Wi-Fi (i.e., Wi-Fi 2.4G) with an operating frequency band of 2.4G on a mobile phone. In fig. 1B, Wi-Fi and BT use a Time Division Duplex (TDD) operating mechanism, and share a receiving path and a transmitting path. One communication cycle comprises BT working time and Wi-Fi working time, wherein the BT working time and the Wi-Fi working time are respectively divided into a plurality of receiving and transmitting cycles, and each receiving and transmitting cycle comprises one transmitting time and one receiving time.

As shown in fig. 1B, BT and Wi-Fi radio frequency transceivers are integrated in the WCN IC, i.e. a Wireless Communication Network (WCN) chip in the figure, and the radio frequency transceivers are provided with signal interfaces shared by BT and Wi-Fi, including two transmitting interfaces (Wi-Fi & BT TX0 and Wi-Fi & BT TX1) and two receiving interfaces (Wi-Fi & BT RX0 and Wi-Fi & BT RX 0). The first group of transmission and reception interfaces (Wi-Fi & BT TX0 and Wi-Fi & BT RX0) are connected to a first transceiving path common to BT and Wi-Fi, and the second group of transmission and reception interfaces (Wi-Fi & BT TX1 and Wi-Fi & BT RX1) are connected to a second transceiving path common to BT and Wi-Fi.

As shown, the first transceiving path and the second transceiving path are integrated in the front end module (i.e., the Wi-Fi & BT FEM chip in the figure). The first transceiving path comprises a first transmitting path and a first receiving path shared by Bluetooth and Wi-Fi. The first transmitting path comprises a power Amplifier PA and a connector CPL0, the first receiving path comprises a Low Noise Amplifier (LNA) and a BYPASS switch BYPASS, the first transmitting path is connected with a transmitting interface Wi-Fi & BT TX0 on the radio frequency transceiver through a first signal transmitting terminal TX0, and the first receiving path is connected with a receiving interface Wi-Fi & BT RX0 on the radio frequency transceiver through a first signal receiving terminal RX 0. The first transmit path and the first receive path also share a single switch, i.e., a single pole double throw switch, SPDT 0. The first terminal (also referred to as the common terminal) of the SPDT0 is connected to the antenna port ATN _0 of the chip.

The PA is used for amplifying a corresponding transmission radio frequency signal to improve transmission power, the LNA is used for amplifying a received radio frequency signal to improve receiving sensitivity, and the CPL0 is used for feeding back part of the transmission power of the PA to the radio frequency transceiver through the port CPLR0 to realize power control. The SPDT0 connects the two branches with the antenna port ATN _0 in a time division mode respectively, and realizes signal receiving and sending of Bluetooth and Wi-Fi. The first transceiving path further includes some capacitors and resistors, which are not described herein again.

The antenna port ATN _0 is connected to a first terminal of a switch SPDT, which may be a single pole double throw switch. One of the two second terminals of the SPDT is connected to the first antenna ANT0 through the first filter FLT0, and the other is connected to the second antenna ANT1 through the second filter FLT 1. The AP may transmit a switching control signal to the switching switch SPDT so that the first transceiving path is connected to the ANT0 or ANT 1.

The second transmission/reception path has the same configuration as the first transmission/reception path, but the antenna port ATN _1 is connected to the third antenna ANT2 through the third filter FLT2 without passing through a changeover switch.

The Wi-Fi & BT FEM chip is also provided with a power supply terminal VCC and some enabling terminals connected with corresponding interfaces of the WCN IC, such as a Bluetooth enabling terminal BTEN, a low noise amplifier enabling terminal LNAEN and a power amplifier enabling terminal PAEN, which are connected with corresponding control ports of the WCN IC.

In this embodiment, the BT and Wi-Fi transmit paths and receive paths are shared, but in other embodiments, the BT and Wi-Fi transmit paths may be independent, the receive path may be shared, or both the BT and Wi-Fi transmit paths and receive paths may be independently configured.

The same problem exists in the embodiment shown in fig. 1A, that is, in the SPDT switching transient state (500 ns), the SPDT is in an open state, and at this time, Wi-Fi or BT may be in a Transmit (TX) state, and a signal reaching the SPDT may be reflected back, thereby adversely affecting the PA inside the FEM.

Fig. 2 is a first schematic diagram of a radio frequency system according to an embodiment of the present application. As shown in fig. 2, the rf system includes an rf transceiver, a first transceiving path, a second transceiving path, a first control circuit, a second control circuit, and a switching control circuit, wherein:

the radio frequency transceiver may be implemented by a Wireless Communication Network (WCN) chip, and is configured to complete a conversion process from a digital signal to a radio frequency signal and a reverse conversion process. After being sent to an rf transceiver, a digital signal encoded by a processor (not shown) is encapsulated into frames, converted, modulated, upconverted, and the like, and finally a corresponding rf signal is generated. Or, the received radio frequency signal is processed by a series of inverse processes in the radio frequency transceiver, such as down-conversion, demodulation, conversion of analog-to-digital signal, decapsulation, etc., and then sent to the processor for decoding and subsequent signal processing.

One end of the first transceiving channel is connected with the radio frequency transceiver, the other end of the first transceiving channel is connected with the first antenna or the second antenna in a switchable manner, and the first transceiving channel is used for transceiving a first radio frequency signal;

specifically, the first transceiving path receives a first radio frequency signal from the radio frequency transceiver and transmits the first radio frequency signal through the first antenna or the second antenna; and receiving the first radio frequency signal from the first antenna or the second antenna and transmitting the first radio frequency signal to the radio frequency transceiver.

One end of the second transceiving channel is connected with the radio frequency transceiver, the other end of the second transceiving channel is connected with the first antenna or the second antenna in a switchable manner, and the second transceiving channel is used for transceiving a second radio frequency signal;

specifically, the second transceiving path receives a second radio frequency signal from the radio frequency transceiver and transmits the second radio frequency signal through the first antenna or the second antenna; and receiving a second radio frequency signal from the first antenna or the second antenna and transmitting the second radio frequency signal to the radio frequency transceiver.

Furthermore, the first transceiving path and the second transceiving path may be implemented by a radio frequency front end module chip, and are configured to amplify a transmitted radio frequency signal to increase transmission power and increase a transmission distance, and may also be configured to connect and feed back a part of the transmission power to a radio frequency transceiver to implement power control; and amplifying the received radio frequency signal to improve reception sensitivity, thereby increasing a reception distance.

Different from the structure shown in fig. 1A, the radio frequency system shown in fig. 2 is additionally provided with a first control circuit, a second control circuit and a switching control circuit, wherein:

the first control circuit is connected with the first transceiving path and the second transceiving path and is configured to transmit a first control signal, wherein the first control signal is used for enabling transceiving functions of the first transceiving path and the second transceiving path;

specifically, the first control circuit is connected with an interface of the radio frequency front end module chip, so as to be connected with the first transceiving path and the second transceiving path, and output a first control signal, so as to enable transceiving functions of the first transceiving path and the second transceiving path.

specifically, the second control circuit is connected with an interface of the radio frequency front end module chip, so as to be connected with the first transceiving path and the second transceiving path, and output a second control signal, wherein the second control signal is used for enabling the antenna switching operation, that is, controlling the antennas used by the first transceiving path and the second transceiving path to be switched from one antenna to another antenna, thereby achieving the purpose of switching the antennas used by the first transceiving path and the second transceiving path.

The switching control circuit determines whether to perform an antenna switching operation according to a first control signal output from the first control circuit and a second control signal output from the second control circuit.

Specifically, the switching control circuit is connected to the first control circuit and the second control circuit, and configured to receive the first control signal and the second control signal, and control one of the first transceiving path and the second transceiving path to be in switching connection with one of the first antenna and the second antenna according to the first control signal and the second control signal.

Compared with the prior art that the antenna switching operation is executed after the antenna switching operation request is received, the radio frequency system provided by the application determines the transceiving states of the first transceiving path and the second transceiving path according to the first control signal when the second control signal is received to request the antenna switching, so as to judge whether the switching can be executed, the antenna switching and the radio frequency transmitting state cannot occur simultaneously, no reflection signal enters the PA, and the problem of the antenna switching transient open circuit PA burning is solved.

The first antenna and the second antenna are used for converting the conduction signal into a wireless signal and sending the wireless signal into the air so as to realize the function of wireless long-distance transmission. The first antenna or the second antenna may be a part of the radio frequency system of this embodiment, or may be partially or entirely independently disposed.

Fig. 3 is a second schematic diagram of the rf system shown in fig. 2. As shown in fig. 3, the switching control line includes a state transition module and a switching device; wherein:

the state conversion module outputs a third control signal according to the first control signal and the second control signal, and the third control module is used for controlling the conducting state of the switching device.

Wherein at least one of the first control signal, the second control signal and the third control signal may represent different states with high and low levels.

Specifically, a first input end of the state conversion module is connected with the first control circuit, a second input end of the state conversion module is connected with the second control circuit, and an output end of the state conversion module is connected with a control end of the switching device, and is used for receiving the first control signal and the second control signal and outputting a third control signal according to the first control signal and the second control signal;

further, after receiving the first control signal and the second control signal, if the second control signal requests an antenna switching operation, the state switching module determines whether the first transceiving path and the second transceiving path are performing a transmitting operation of the radio frequency signal according to the first control signal; and if the first transceiving path and the second transceiving path do not perform the transmission operation of the radio frequency signal, outputting a third control signal for performing the antenna switching operation.

The switching device is configured to control one of the first and second transceiving paths and one of the first and second antennas to be in a conductive state according to a third control signal.

Specifically, the input end of the switch device is connected with the first transceiving path or the second transceiving path, the first output end of the switch device is connected with the first antenna, the second output end of the switch device is connected with the second antenna,

the switching device may be implemented as a single pole double throw SPDT switch, and in other embodiments, may be other types of switches, such as a single pole triple throw SP3T switch, a single pole single throw SPST switch, or the like.

The input end of the switching device is connected to the first transceiving path as an example:

taking the current working antenna as the first antenna as an example, if the second control signal requests the antenna switching operation, it is determined whether the first transceiving path is executing the transmission operation of the first radio frequency signal according to the first control signal.

If the first transceiving channel does not execute the transmission operation of the first radio frequency signal, the first transceiving channel is not in a radio frequency transmission state. Because the antenna switching and the radio frequency transmitting state can not occur simultaneously, when the first radio frequency channel is not in the radio frequency transmitting state, the antenna switching operation can be executed, namely, the working antenna is switched from the first antenna to the second antenna, and no reflection signal enters the PA while the antenna switching is realized, so that the problem of PA burning caused by the antenna switching transient open circuit is solved.

If the first transceiving path executes the transmission operation of the first radio frequency signal, the first transceiving path is in a radio frequency transmission state. Because the antenna switching and the radio frequency transmitting state can not occur simultaneously, when the first radio frequency channel is in the radio frequency transmitting state, the antenna switching operation can not be executed, no reflection signal enters the PA, and therefore the problem of burning the PA in the antenna switching transient open circuit is solved.

Similarly, when the input terminal of the switching device is connected to the second transceiving path, the implementation is similar, and the detailed description is omitted here.

And outputting a third control signal by using the state conversion module to control the conduction state of the switching device, thereby realizing the control purpose of antenna switching.

Fig. 4 is a third schematic diagram of the rf system shown in fig. 2. As shown in fig. 4, the radio frequency transceiver is configured with a transmit port configured to support transmit processing of the first and second radio frequency signals and a receive port configured to support receive processing of the first and second radio frequency signals.

In the application, the same transmitting port can transmit the first radio-frequency signal and the second radio-frequency signal at the same time, and the same receiving port can receive the first radio-frequency signal and the second radio-frequency signal at the same time, so that the first transceiving access and the second transceiving access are both connected with the same transmitting port, and the first transceiving access and the second transceiving access are both connected with the same receiving port, thereby improving the integration level of the circuit.

Specifically, the first transceiving path includes a first transmitting branch and a first receiving branch, wherein:

the input end of the first transmitting branch is connected with the transmitting port of the radio frequency transceiver, and the output end of the first transmitting branch is switchably connected with the input end of the switching device.

Specifically, the first transmitting branch receives a first radio frequency signal through a transmitting port of the radio frequency transceiver, and is connected with the first antenna or the second antenna through the switching device, so that the first radio frequency signal is transmitted by using the first antenna or the second antenna. Further, the first transmitting branch is further configured with a first power amplifying unit for performing power amplification processing on the first radio frequency signal. The first transmitting branch may further amplify the first radio frequency signal by using a first power amplifying unit in the first transmitting branch and then output the amplified first radio frequency signal, so as to increase a transmission distance of the first radio frequency signal.

The input end of the first receiving branch is connected with the receiving port of the radio frequency transceiver, and the output end of the first receiving branch is switchably connected with the input end of the switching device.

Specifically, the first receiving branch is connected to the first antenna or the second antenna through the switching device, so as to receive the first radio frequency signal from the first antenna or the second antenna, and send the received first radio frequency signal to the radio frequency transceiver through the receiving port of the radio frequency transceiver. Further, the first receiving branch is further configured with a second power amplifying unit for performing power amplification processing on the first radio frequency signal. The first receiving branch can also amplify the first radio frequency signal by using the second power amplifying unit in the first receiving branch and then output the amplified first radio frequency signal, so as to increase the receiving distance of the second radio frequency signal.

In one exemplary embodiment, the second transceiving path comprises a second transmitting branch and a second receiving branch, wherein:

the input end of the second transmitting branch is connected with the transmitting port of the radio frequency transceiver, and the output end of the second transmitting branch is switchably connected with the input end of the switching device.

Specifically, the second transmitting branch receives the second radio frequency signal through a transmitting port of the radio frequency transceiver, and is connected to the first antenna or the second antenna through the switching device, so that the second radio frequency signal is transmitted by using the first antenna or the second antenna. Further, the second transmitting branch is further configured with a first power amplifying unit for performing power amplification processing on the second radio frequency signal. The second transmitting branch can also amplify the second radio frequency signal by using the first power amplifying unit in the second transmitting branch and then output the second radio frequency signal, so as to increase the transmission distance of the second radio frequency signal.

The input end of the second receiving branch is connected with the receiving port of the radio frequency transceiver, and the output end of the second receiving branch is switchably connected with the input end of the switching device.

Specifically, the second receiving branch is connected to the first antenna or the second antenna through the switching device, so as to receive the first radio frequency signal from the first antenna or the second antenna, and send the received second radio frequency signal to the radio frequency transceiver through the receiving port of the radio frequency transceiver. Further, the second receiving branch is further configured with a second power amplifying unit, which is used for performing power amplification processing on the second radio frequency signal. The second receiving branch may further amplify the second radio frequency signal by using a second power amplifying unit in the second receiving branch, and then output the amplified second radio frequency signal, so as to increase a receiving distance of the second radio frequency signal.

Further, a Time Division Duplex (TDD) working mechanism is adopted for a first frequency band corresponding to the first radio frequency signal and a second frequency band corresponding to the second radio frequency signal, that is, the first transceiving path and the second transceiving path are the same transceiving path and share the receiving branch and the transmitting branch. The communication cycle comprises the working time of a first frequency band and the working time of a second frequency band, wherein the working time of the first frequency band and the working time of the second frequency band are respectively divided into a plurality of transceiving cycles, and each transceiving cycle comprises one transmitting time and one receiving time.

The transmitting port and the receiving port of the radio frequency transceiver support the frequency bands corresponding to the first radio frequency signal and the second radio frequency signal, so that the first transceiving path and the second transceiving path use the same transmitting port and receiving port, and the same transceiving path is used for completing transceiving of the first radio frequency signal and the second radio frequency signal due to the fact that the circuit structures of the first transceiving path and the second transceiving path are the same.

By adopting the structure, the first radio frequency signal and the second radio frequency signal can be received and transmitted, and the circuit structure of the radio frequency system is simplified.

In one exemplary embodiment, the first control circuit includes a first control branch, a second control branch, and a third control branch; wherein:

a first control branch configured to output a first branch signal, wherein the first branch signal is used to enable a first PA in the first transceiving circuit and the second transceiving circuit;

specifically, after the first transceiving path receives the first branch signal, if the first branch signal enables the first PA to be in a working state, the first transceiving circuit executes a transmitting operation of the first radio frequency signal; if the first branch signal is that the first PA is enabled not to be in the working state, the first transceiver circuit does not execute the transmission operation of the first radio frequency signal. Similarly, a processing manner of the second radio frequency signal by the second transceiving channel can be obtained, which is not described herein again.

After the state conversion module receives the first branch signal, if the first branch signal enables the first PA to be in a working state, it can be determined that the current first transceiving path is in a radio frequency transmitting state; if the first branch signal is that the first PA is not in the working state, it may be determined that the first transceiving path is not in the radio frequency transmission state currently.

A second control branch configured to output a second branch signal, wherein the second branch signal is used for enabling transceiving operation of the first radio frequency signal in the first transceiving circuit and the second transceiving circuit;

specifically, after the first transceiving path receives the second branch signal, if the second branch signal enables the first radio frequency signal to be in a transceiving state, the first transceiving circuit may perform transceiving operation of the first radio frequency signal; if the second branch circuit signal is the first radio frequency signal which is enabled not to be in the transceiving state, the first transceiving circuit does not execute the transceiving operation of the first radio frequency signal.

After the state conversion module receives the second branch signal, if the second branch signal enables the first radio frequency signal to be in a receiving and sending state, the first receiving and sending channel can be determined to be in the radio frequency receiving and sending state currently; if the first branch signal is the enabling first radio frequency signal which is not in the transceiving state, it can be determined that the current first transceiving channel is not in the radio frequency transceiving state.

A third control branch configured to output a third branch signal, wherein the third branch signal is used for enabling a second PA in the first transceiving circuit and the second transceiving circuit;

specifically, after the first transceiving path receives the third branch signal, if the third branch signal enables the second PA to be in a working state, the first transceiving circuit executes a receiving operation of the first radio frequency signal; if the first branch signal is that the second PA is enabled not to be in the working state, the first transceiver circuit does not execute the receiving operation of the first radio frequency signal. Similarly, a processing manner of the second radio frequency signal by the second transceiving channel can be obtained, which is not described herein again.

After the state conversion module receives the third branch signal, if the third branch signal enables the second PA to be in a working state, it can be determined that the current first transceiving channel is in a radio frequency receiving state; if the third branch signal is that the second PA is not in the working state, it may be determined that the first transceiving path is not in the radio frequency receiving state currently.

In an exemplary embodiment, the second control circuit includes an AP, and the application controller AP is configured to determine whether to perform an antenna switching operation according to the received acquisition result, and output the second control signal.

Specifically, the application controller AP may determine whether to perform an antenna switching operation according to a preset antenna switching policy, such as strength of a signal or an external switching request.

Furthermore, the first radio frequency signal is a Bluetooth signal, and the second radio frequency signal is a Wi-Fi signal.

Fig. 5 is a schematic diagram of an application of the rf system shown in fig. 4. As shown in fig. 5, the rf system is a circuit diagram of a rf system shared by bluetooth and Wi-Fi (i.e., Wi-Fi 2.4G) with an operating frequency band of 2.4G on a mobile phone. In fig. 5, the Wi-Fi and BT use the TDD operation mechanism and share the same transceiving path, and the transceiving path shared by the Wi-Fi and BT is taken as the first transceiving path as an example. One communication cycle comprises BT working time and Wi-Fi working time, wherein the BT working time and the Wi-Fi working time are respectively divided into a plurality of receiving and transmitting cycles, and each receiving and transmitting cycle comprises one transmitting time and one receiving time.

The radio frequency transceiver is provided with a signal interface shared by BT and Wi-Fi, and comprises a transmitting interface Wi-Fi & BT TX0 and a receiving interface Wi-Fi & BT RX 0;

the first transmitting branch shared by Wi-Fi and BT comprises a power amplifier PA and a connector CPL0, and is connected with a transmitting interface Wi-Fi & BT TX0 on a radio frequency transceiver through a first signal transmitting terminal TX 0; the first receiving branch shared by Wi-Fi and BT, which comprises a low noise amplifier LNA and a BYPASS switch BYPASS, is connected to the receiving interface Wi-Fi & BT RX0 on the radio frequency transceiver through a first signal receiving terminal RX 0. The first transmitting branch and the first receiving branch also share one switch, namely, a single-pole double-throw switch SPDT 0. The first terminal (also referred to as the common terminal) of the SPDT0 is connected to the antenna port ATN _0 of the chip.

The antenna port ATN _0 is connected to a first terminal of a switching device SPDT1, which SPDT1 may be a single pole double throw switch. One of two second terminals of the SPDT1 is connected to the first antenna ANT0 through the first filter FLT0, and the other is connected to the second antenna ANT1 through the second filter FLT 1.

The state transition module may transmit a third control signal to the switching device SPDT1 such that the first transceiving path is connected to the first antenna ANT0 or the second antenna ANT 1.

In the embodiment shown in fig. 5, the Wi-Fi & BT FEM chip further has a power supply terminal VCC, and some enable terminals connected to corresponding interfaces of the WCN IC, such as a bluetooth enable terminal BTEN, a low noise amplifier enable terminal LNAEN, and a power amplifier enable terminal PAEN, which are connected to corresponding control ports of the WCN IC.

The WCN IC is provided with a plurality of GPIOs for connecting an enabling end on a front end module, corresponding to an enabling end corresponding to a Wi-Fi & BT FEM chip, and comprises a first GPIO interface (WL _ XFEM _ CTRL _2G _ CH1_0_ GPIO) connected with a power amplifier enabling end PAEN, a second GPIO interface (WL _ XFEM _ CTRL _2G _ CH1_1_ GPIO) connected with a low noise amplifier enabling end LNAEN, and a third GPIO interface (WL _ XFEM _ CTRL _2G _ CH1_2_ GPIO) connected with a Bluetooth enabling end BTEN.

Specifically, if the signal received by the power amplifier enable terminal PAEN from the first GPIO interface is that the enable PA is in a working state, it indicates that the current first transmit branch is in a working state; and if the signal received from the first GPIO interface is that the enabled PA is not in the working state, indicating that the first radio frequency branch is not in the working state currently.

If the signal received by the low noise amplifier enabling end LNAEN from the second GPIO interface is that the enabling LNA is in a working state, the first receiving branch is in a working state; if the signal received from the second GPIO interface is that the LNA is enabled not to be in the working state, the first receiving branch is not in the working state currently.

If the signal received by the bluetooth enabling end BTEN from the third GPIO interface is that the radio frequency signal of the BT is enabled to be in a receiving and sending state, the current first transmitting branch and the current first receiving branch are in the receiving and sending state of the radio frequency signal of the BT; if the signal received from the third GPIO interface is that the BT-enabled radio frequency signal is not in the working state, it indicates that the current first transmitting branch and the current first receiving branch are not in the BT radio frequency signal transceiving state.

Fig. 6 is a fourth schematic diagram of the rf system shown in fig. 2. As shown in fig. 6, the radio frequency system further includes:

and one end of the transmitting path is connected with the radio frequency transceiver, the other end of the transmitting path is connected with the first antenna or the second antenna in a switchable manner, and the transmitting path is used for transmitting the first radio frequency signal.

The radio frequency transceiver further comprises another transmission port for transmitting the first radio frequency signal.

The transmit path includes a power amplifier PA and a BYPASS switch BYPASS.

The transmitting channel receives the first radio frequency signal through the other transmitting port, and the first radio frequency signal is amplified by the power amplifier and then output.

Fig. 7 is a schematic diagram of an application of the rf system shown in fig. 6. As shown in fig. 7, the transmission path is connected to a bluetooth transmission interface BT TX0 on the radio frequency transceiver through a bluetooth transmission terminal BT0, wherein the first control branch and the second control branch can both control the radio frequency transmission state of the transmission path.

Fig. 8 is a flowchart of an antenna switching method according to an embodiment of the present application. As shown in fig. 8, an antenna switching method is implemented in an electronic device, such as a mobile phone, where the electronic device includes a radio frequency system according to any embodiment of the present application, and the antenna switching method includes:

step 110, receiving a first control signal and a second control signal; the first control signal is used for enabling the transceiving functions of the first transceiving path and the second transceiving path, and the second control signal is used for enabling the antenna switching operation;

step 120, if the second control signal requests an antenna switching operation, determining whether the first transceiving path and the second transceiving path are executing a transmission operation of a radio frequency signal according to the first control signal;

and step 130, if the first transceiving path and the second transceiving path do not perform the transmission operation of the radio frequency signal, performing an antenna switching operation.

Compared with the prior art that the antenna switching operation is executed after the antenna switching operation request is received, the method provided by the application also determines the transceiving states of the first transceiving path and the second transceiving path according to the first control signal when the second control signal is received to request the antenna switching, so as to judge whether the switching can be executed, so that the antenna switching and the radio frequency transmitting state cannot occur simultaneously, and no reflection signal enters the PA, thereby solving the problem of the antenna switching transient open circuit PA burning.

The following describes a method provided in an embodiment of the present application:

according to the first control signal, judging whether the first transceiving path and the second transceiving path execute the transmission operation of the radio frequency signal, including:

acquiring a first branch signal output by a first control branch and a second branch signal output by a second control branch, wherein the first branch signal is used for enabling a first power amplification unit in a first transceiving circuit and a second transceiving circuit, and the second branch signal is used for enabling transceiving operation of radio frequency signals of a second frequency band in the first transceiving circuit and the second transceiving circuit;

and judging whether the first transceiving channel and the second transceiving channel execute the transmitting operation of the radio frequency signal or not according to the first branch signal and the second branch signal.

Whether the first transceiving channel and the second transceiving channel execute the transmitting operation of the radio frequency signal or not is judged according to the first branch signal and the second branch signal, and the judgment mode is simple to realize.

The radio frequency system shown in fig. 7 is taken as an example and is explained with reference to the timing diagram shown in fig. 9:

in the rf system shown in fig. 7, when the signal of the third control signal SPDT _ OUT is at a high level, the SPDT1 selects the second antenna ANT 1; when the signal of the third control signal SPDT _ OUT is a low level, the first antenna ANT0 is selected. Wherein the opposite logic is possible depending on the actual circuit.

(1) When the AP determines that the AP is to switch to the ANT1 in the designated scene, the level of the AP output second control signal AP _ CTRL signal is at a high level, and at this time, the state transition module may collect the current second control signal at the same time, where the second control signal includes a PA EN signal, a BT EN signal, and a LNA EN signal, and in the drawing, the levels of the PA EN signal and the BT EN signal are both at a low level, which indicates that both WIFI and BT are in a non-TX state, and then the SPDT _ OUT control signal is pulled up accordingly, thereby immediately completing the antenna switching.

(2) When the AP determines that the AP is to switch to the ANT0 in the designated scene, the level of the AP output second control signal AP _ CTRL signal is at a low level, and at this time, the state transition module may simultaneously collect the current second control signal, where the second control signal includes a PA EN signal, a BT EN signal, and a LNA EN signal, and in the drawing, the levels of the PA EN signal and the BT EN signal are both at a low level, which indicates that both WIFI and BT are in a non-TX state, and the level of the LNA _ EN signal is at a high level, which indicates that WIFI/BT is in an RX state, and at this time, the third control signal SPDT _ OUT control signal may also be immediately pulled down to switch to the ANT0 antenna, because the switch in the RX state does not have a risk of hardware damage.

(3) When the AP determines to switch to the ANT1 again in the designated scenario, the level of the AP output second control signal AP _ CTRL signal is at a high level, and at this time, the state transition module may simultaneously collect the current second control signal, which includes a PA EN signal, a BT EN signal, and a LNA EN signal, and in the drawing, the level of the BT EN signal is at a high level, which indicates that BT is in a TX state, and at this time, the antenna cannot be switched, so the level of the third control signal SPDT _ OUT is always at a low level, and the state continues until BT EN is pulled down, and the third control signal SPDT _ OUT is pulled up, thereby completing the antenna switching.

(4) When the AP determines that the AP is to be switched to the ANT0 in the designated scene, the AP outputs the second control signal AP _ CTRL with a low level, and at this time, the state switching module may simultaneously collect the current second control signal, which includes a PA EN signal, a BT EN signal, and a LNA EN signal, where the level of the PA EN signal is a high level, which indicates that WIFI is in a TX state, indicating that the antenna cannot be switched at this time, so the level of the third control signal SPDT _ OUT is always a high level, and the state continues until the PA EN is pulled low, and the third control signal SPDT _ OUT is pulled low, thereby completing the antenna switching.

From the above description, it can be seen that the second control signal AP _ CTRL determines whether to perform antenna switching, but the time point when the actual antenna switching is completed is determined by the PA EN signal, the BT EN signal, and the LNA EN and AP CTRL control signals, so as to ensure that the SPDT1 cannot switch the antenna in WIFI or BT TX.

When the scheme combines the control signals to obtain the switching time sequence, only the BT and WIFI are switched when not TX. Just because the antenna switching can also switch antennas when in the WIFI/BT RX state, it has the advantages of ensuring lower time delay for completing scene determination and antenna switching, and faster response, and in the case of sequence number (2) in the timing diagram shown in fig. 9, the switching completion transient state is an open-circuit state, so the RX process may lose packets, resulting in an increase of one retransmission, and if the antenna switching is frequently performed, the jamming may be obvious. Based on the above problems, the following solutions are proposed, including:

optionally, the method further comprises:

if the first transceiving passage and the second transceiving passage do not execute the transmitting operation of the first radio frequency signal or the second radio frequency signal, detecting whether the first transceiving passage and the second transceiving passage execute the receiving operation of the radio frequency signal or not;

and after detecting that the first transceiving channel and the second transceiving channel do not execute the receiving operation of the radio frequency signal, executing the antenna switching operation.

Optionally, the detecting whether the first transceiving path and the second transceiving path perform the operation of receiving the radio frequency signal in the first frequency band or the second frequency band includes:

acquiring a third branch signal output by a third control branch, wherein the third branch signal is used for enabling low-noise power amplification units in the first transceiver circuit and the second transceiver circuit;

and judging whether the first transceiving channel and the second transceiving channel execute the receiving operation of the radio frequency signal or not according to the third branch signal.

Optionally, the method further includes:

if at least one of the first transceiving path and the second transceiving path is executing the receiving operation of the radio frequency signal, monitoring whether the level of the third branch signal changes;

and if the level of the third branch signal changes, determining that the first transceiving path and the second transceiving path do not execute the receiving operation of the radio frequency signal.

Whether the receiving operation of the radio frequency signal is finished or not is judged by detecting whether the level changes or not, and the implementation mode is simple.

The timing chart shown in fig. 10 is taken as an example to explain:

when the second control signal AP _ CTRL determines that the antenna needs to be switched during a scene change, if the LNA EN is in a pull-up state at this time, that is, the WIFI/BT is in an RX state, the SPDT OUT continues until the RX event ends, and the antenna is switched.

The advantage of this scheme is that it does not cause RX packet loss, reduces retransmissions, but slows the response of antenna switching to scene switching. However, in combination with the user scenario, the switching of the general user scenario is less frequent, and the requirement can be met without the need of switching the antenna as fast, so the extended scheme has a better effect in some infrequent switching scenarios.

An embodiment of the present application further provides an antenna switching apparatus, as shown in fig. 11, including a memory 60 and a processor 50 storing a computer program, where the processor 50 can implement the antenna switching method as above when executing the computer program.

An embodiment of the present application further provides an electronic device, where the electronic device includes the radio frequency system according to any of the above embodiments.

An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the antenna switching method according to any one of the above embodiments can be implemented.

The above embodiments of the present application present a solution to the problem that an antenna switching transient open circuit may damage a PA. The method can avoid the radio frequency signal from being reflected back to the PA after being transmitted to the change-over switch during the switch switching, thereby solving the influence on the PA in the intelligent antenna switching scheme.

In any one or more of the exemplary embodiments described above, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium and executed by a hardware-based processing unit. Computer-readable media may comprise computer-readable storage media corresponding to tangible media, such as data storage media, or communication media including any medium that facilitates transfer of a computer program from one place to another, such as according to a communication protocol. In this manner, the computer-readable medium may generally correspond to a non-transitory tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, code and/or data structures for implementing the techniques described in this disclosure. The computer program product may include a computer-readable medium.

By way of example, and not limitation, such computer-readable storage media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, flash memory, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection may be termed a computer-readable medium, and if instructions are transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, for example, the coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. It should be understood, however, that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transitory (transitory) media, but are instead directed to non-transitory tangible storage media. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk or blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

By way of example, and not limitation, instructions may be executed by one or more processors, such as one or more Digital Signal Processors (DSPs), general purpose microprocessors, Application Specific Integrated Circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuitry. Thus, the term "processor," as used herein may refer to any of the foregoing structure or any other structure suitable for implementation of the techniques described herein. In addition, in some aspects, the functionality described herein may be provided within dedicated hardware and/or software modules configured for encoding and decoding, or incorporated in a combined codec. Also, the techniques may be fully implemented in one or more circuits or logic elements.

The techniques of the embodiments of the present disclosure may be implemented in a wide variety of devices or apparatuses, including a wireless handset, an Integrated Circuit (IC), or a set of ICs (e.g., a chipset). Various components, modules, or units are described in embodiments of the disclosure to emphasize functional aspects of devices configured to perform the techniques described, but do not necessarily require realization by different hardware units. Rather, as above, the various units may be combined in a codec hardware unit or provided by a collection of interoperating hardware units (including one or more processors as above) in conjunction with suitable software and/or firmware.

Claims

1. A radio frequency system, comprising:

a radio frequency transceiver;

and the switching control circuit is connected with the first control circuit and the second control circuit and used for receiving the first control signal and the second control signal and controlling one of the first transceiving path and the second transceiving path to be in switching connection with one of the first antenna and the second antenna according to the first control signal and the second control signal.

2. The radio frequency system of claim 1, wherein:

the switching control circuit comprises a state conversion module and a switching device; wherein:

a first input end of the state conversion module is connected with the first control circuit, a second input end of the state conversion module is connected with the second control circuit, and an output end of the state conversion module is connected with a control end of the switching device, and is used for receiving the first control signal and the second control signal and outputting a third control signal according to the first control signal and the second control signal;

an input end of the switching device is connected to the first transceiving path or the second transceiving path, a first output end of the switching device is connected to the first antenna, a second output end of the switching device is connected to the second antenna, and the switching device is configured to control one of the first transceiving path and the second transceiving path and one of the first antenna and the second antenna to be in a conducting state according to the third control signal.

3. The radio frequency system of claim 2, wherein the radio frequency transceiver is configured with a transmit port configured to support transmit processing of the first and second radio frequency signals and a receive port configured to support receive processing of the first and second radio frequency signals.

4. The radio frequency system according to claim 3, wherein the first transceiving path comprises a first transmitting branch and a first receiving branch, wherein:

the input end of the first transmitting branch is connected with the transmitting port of the radio frequency transceiver, the output end of the first transmitting branch is switchably connected to the input end of the switching device, and the first transmitting branch is further configured with a first power amplifying unit for performing power amplification processing on the first radio frequency signal;

the input end of the first receiving branch is connected with the receiving port of the radio frequency transceiver, the output end of the first receiving branch is switchably connected to the input end of the switching device, and the first receiving branch is further configured with a second power amplifying unit for performing power amplification processing on the first radio frequency signal.

5. The radio frequency system according to claim 4, wherein the second transceiving path comprises a second transmitting branch and a second receiving branch, wherein:

the input end of the second transmitting branch is connected with the transmitting port of the radio frequency transceiver, the output end of the second transmitting branch is switchably connected to the input end of the switching device, and the second transmitting branch is further configured with the first power amplifying unit for performing power amplification processing on the second radio frequency signal;

the input end of the second receiving branch is connected with the receiving port of the radio frequency transceiver, the output end of the second receiving branch is switchably connected to the input end of the switching device, and the second receiving branch is further configured with the second power amplifying unit for performing power amplification processing on the second radio frequency signal.

6. The RF system of claim 5, wherein the first transceiving path and the second transceiving path are the same transceiving path and are configured to operate in a time division duplex mode.

7. The radio frequency system according to claim 1, wherein the first radio frequency signal is a bluetooth signal and the second radio frequency signal is a Wi-Fi signal.

8. The system of claim 1, wherein:

the first transceiving access and the second transceiving access are both provided with control interfaces, and the control interfaces are connected with the first control circuit and used for receiving the first control signal.

9. The system of any of claims 4 to 8, wherein the first control circuit comprises:

a first control branch configured to output a first branch signal, wherein the first branch signal is used to enable the first power amplification unit in the first transceiver circuit and the second transceiver circuit;

a second control branch configured to output a second branch signal, wherein the second branch signal is used for enabling transceiving operation of the radio frequency signal of the first frequency band in the first transceiving circuit and the second transceiving circuit;

a third control branch configured to output a third branch signal, wherein the third branch signal is used to enable the second power amplifying unit in the first transceiver circuit and the second transceiver circuit.

10. The system of claim 1, wherein the second control circuit comprises an application controller configured to determine whether to perform an antenna switching operation based on the received acquisition result, and output a second control signal.

11. An antenna switching method applied to the radio frequency system according to any one of claims 1 to 10, comprising:

12. The method of claim 11, wherein the determining whether the first transceiving path and the second transceiving path are performing the transmission operation of the radio frequency signal according to the first control signal comprises:

acquiring a first branch signal output by the first control branch and a second branch signal output by the second control branch, wherein the first branch signal is used for enabling a first power amplification unit in the first transceiver circuit and the second transceiver circuit, and the second branch signal is used for enabling the transceiver operation of radio frequency signals in a second frequency band in the first transceiver circuit and the second transceiver circuit;

and judging whether the first transceiving path and the second transceiving path execute the transmitting operation of the radio frequency signal or not according to the first branch signal and the second branch signal.

13. The method according to claim 11 or 12, characterized in that the method further comprises:

if the first transceiving path and the second transceiving path do not execute the transmitting operation of the first radio frequency signal or the second radio frequency signal, detecting whether the first transceiving path and the second transceiving path execute the receiving operation of the radio frequency signal or not;

14. The method according to claim 13, wherein said detecting whether the first transceiving path and the second transceiving path perform the operation of receiving the radio frequency signal in the first frequency band or the second frequency band comprises:

acquiring a third branch signal output by the third control branch, wherein the third branch signal is used for enabling a low-noise power amplification unit in the first transceiver circuit and the second transceiver circuit;

and judging whether the first transceiving path and the second transceiving path execute the receiving operation of the radio frequency signal or not according to the third branch signal.

15. The method of claim 14, further comprising:

if at least one of the first transceiving path and the second transceiving path is performing receiving operation of radio frequency signals, monitoring whether the level of the third branch signal changes;

and if the level of the third branch signal is changed, determining that the first transceiving path and the second transceiving path do not execute the receiving operation of the radio frequency signal.

16. An electronic device comprising a radio frequency system as claimed in any one of claims 1 to 10.

17. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, is adapted to carry out the method of antenna switching according to any one of claims 11 to 15.