CN210694375U - Bluetooth communication circuit and electronic equipment - Google Patents

Abstract

The embodiment of the utility model discloses bluetooth communication circuit and electronic equipment to solve multiple communication mode's bluetooth mutual interference's among the electronic equipment problem. This bluetooth communication circuit includes: the device comprises a plurality of Bluetooth chips, a circulator, a Bluetooth antenna and a modulation module; wherein the plurality of Bluetooth chips are connected with the Bluetooth antenna through the circulator; the modulation module is used for extracting signals from a transmitting path of the Bluetooth chip in a transmitting state, modulating the signals and then coupling the modulated signals into a receiving path of the Bluetooth chip in a receiving state so as to inhibit interference signals which are coupled into the receiving path through the circulator in the transmitting path.

Description

Bluetooth communication circuits and electronic equipment

technical field

The embodiments of the utility model relate to the technical field of terminals, and in particular, to a Bluetooth communication circuit and an electronic device.

Background technique

As a communication solution for the Internet of Things, Bluetooth has significant advantages in terms of power consumption and networking. Based on the development trend of the Internet of Things, there will be more and more Internet of Things electronic devices, such as mobile phones, smart home devices, and smart wearable devices. The above-mentioned electronic devices usually need to meet the requirements of low power consumption and high speed at the same time. Low power consumption ensures the standby time of the electronic device, and high speed enables the electronic device to realize fast and large data exchange.

In response to the above requirements, there are currently two mainstream solutions: solution one, using dual-mode Bluetooth chips; solution two, the chips and antennas of classic Bluetooth and Bluetooth low energy are designed separately. Although scheme 1 can make classic Bluetooth and low-power Bluetooth work at the same time, they will interfere with each other when they work at the same time; the dual-antenna design of scheme 2 is difficult to meet the requirements of high integration and miniaturization of electronic equipment.

Therefore, how to provide a Bluetooth communication circuit to simultaneously meet the needs of Bluetooth communication in multiple modes, such as low power consumption and high speed, and how to make the Bluetooth of multiple communication modes not interfere with each other is an urgent need in the prior art. technical problem.

Utility model content

The embodiments of the present invention provide a Bluetooth communication circuit and an electronic device, so as to solve the problem of mutual interference between Bluetooth of multiple communication modes in the electronic device.

In order to solve the above-mentioned technical problems, the embodiments of the present utility model are implemented as follows:

In a first aspect, a Bluetooth communication circuit is provided, including:

Multiple Bluetooth chips, circulators, Bluetooth antennas and modulation modules; among them,

The plurality of Bluetooth chips are connected to the Bluetooth antenna through the circulator;

The modulation module is used to extract a signal from the transmission path of the Bluetooth chip in the transmitting state, and after modulating the signal, it is coupled to the receiving path of the Bluetooth chip in the receiving state, so as to suppress the transmission path in the transmission path. The circulator is coupled to an interfering signal in the receive path.

In a second aspect, an electronic device is provided, the electronic device includes a circuit for implementing the Bluetooth communication according to the first aspect.

In the embodiment of the present invention, multiple Bluetooth chips share one antenna through a circulator, which realizes isolation between multiple Bluetooth chips, avoids mutual interference between multiple Bluetooth chips, and facilitates the realization of high integration and miniaturization of electronic equipment. At the same time, the modulation module extracts the signal from the transmission path of the Bluetooth chip in the transmitting state, modulates the signal and couples it to the receiving path of the Bluetooth chip in the receiving state to suppress the interference signal in the receiving path, The interference between multiple Bluetooth chips is further reduced.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. . In the attached image:

FIG. 1 is a schematic diagram of a Bluetooth communication circuit provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, not all of the embodiments. . Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in FIG. 1 , an embodiment of the present invention provides a Bluetooth communication circuit, which can be applied to an electronic device and is connected to a Microcontroller Unit (MCU) 10 of the electronic device.

The above-mentioned bluetooth communication circuit mainly includes: MCU10, classic bluetooth (Bluetooth BT) chip 20, low-power bluetooth (Bluetooth Low Energy, BLE) chip 30, modulation module 40, circulator 50 and bluetooth antenna 60, the following will describe the above components for a detailed introduction.

The above-mentioned MCU10 is mainly used to control and process the status and data of the BT chip 20 and the BLE chip 30 ; meanwhile, the MCU10 is also used to provide a DC signal to the mixing unit 46 and the mixing unit 47 .

One end of the BT chip 20 is connected to the MCU 10 , and the other end is connected to the Bluetooth antenna 60 through the circulator 50 . The BT chip 20 is mainly used for modulating baseband signals or demodulating radio frequency signals.

The BT chip 20 may be a chip that supports the Bluetooth protocol below 4.0, and is generally used in transmission scenarios with a relatively large amount of data for electronic devices, such as voice, music and other high-volume transmission. Specifically, the BT chip 20 may be a traditional Bluetooth chip or a high-speed Bluetooth chip.

One end of the BLE chip 30 is connected to the MCU 10 , and the other end is connected to the Bluetooth antenna 60 through the circulator 50 . The BLE chip 30 is mainly used for modulating baseband signals or demodulating radio frequency signals.

The BLE chip 30 may be a chip supporting Bluetooth protocol 4.0 or higher, and the biggest feature is the reduction of cost and power consumption.

As shown in FIG. 1 , the modulation module 40 mainly includes a coupling unit 41 , a coupling unit 42 , a power distribution unit 43 , a power distribution unit 44 , a phase shift unit 45 , a frequency mixing unit 46 and a frequency mixing unit 47 .

The coupling unit 41 can be used to extract a part of the signal from the transmission path of the BT chip 20 shown in the upper part of FIG. 1 when the BT chip 20 is in the transmitting state and the BLE chip 30 is in the receiving state, and send it to the power distribution unit 43 . The coupling unit 41 can also be used to receive the signal output by the power distribution unit 43 when the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, and couple it to the receiving path of the BT chip 20 shown in the upper part of FIG. 1 . .

The power distribution unit 43 can be used to divide the signal output by the coupling unit 41 into two channels when the BT chip 20 is in the transmitting state and the BLE chip 30 is in the receiving state, and send it to the phase shifting unit 45 and the frequency mixing unit 47; When the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, the two signals output by the phase shifting unit 45 and the frequency mixing unit 47 are combined and sent to the coupling unit 41 .

The phase-shifting unit 45 is mainly used to perform phase-shift processing on the input signal, for example, to shift the phase angle of the input signal by 90°. The input signal mentioned here may be when the BT chip 20 is in the transmitting state. , When the BLE chip 30 is in the receiving state, the power distribution unit 43 outputs the signal to the phase shifting unit 45; it can also be the signal output by the power distribution unit 43 to the phase shifting unit 45 when the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state. input signal.

The frequency mixing unit 46 mainly realizes the function of frequency mixing, and is mainly used for mixing the AC signal output by the phase shifting unit 45 and the DC signal I output by the MCU 10 when the BT chip 20 is in the transmitting state and the BLE chip 30 is in the receiving state. , and sent to the power distribution unit 44; or, when the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, the AC signal output by the power distribution unit 44 and the DC signal I output by the MCU10 are mixed. and sent to the phase shifting unit 45 .

The frequency mixing unit 47 mainly realizes the function of frequency mixing, and is mainly used for mixing the AC signal output by the power distribution unit 43 and the DC signal Q output by the MCU 10 when the BT chip 20 is in the transmitting state and the BLE chip 30 is in the receiving state. , and sent to the power distribution unit 44; or, when the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, the AC signal output by the power distribution unit 44 and the DC signal Q output by the MCU10 are mixed. and sent to the power distribution unit 43 .

The power distribution unit 44 can be used to combine the two-channel signals output by the frequency mixing unit 46 and the frequency mixing unit 47 when the BT chip 20 is in the transmitting state and the BLE chip 30 is in the receiving state, and send it to the coupling unit 42; or When the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, the signal output by the coupling unit 42 is equally divided into two paths, and sent to the frequency mixing unit 46 and the frequency mixing unit 47 .

The coupling unit 42 can be used to receive the signal output by the power distribution unit 44 when the BT chip 20 is in the transmitting state and the BLE chip 30 is in the receiving state, and couple it to the receiving path of the BLE chip 30 shown in the lower part of FIG. 1 . The coupling unit 42 can also be used to extract a part of the signal from the transmission path of the BLE chip 30 shown in the lower part of FIG. 1 when the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, and send it to the power distribution unit 44.

The circulator 50 is mainly used to isolate the BT chip 20 and the BLE chip 30, so that the transmission and reception of the BT chip 20 and the BLE chip 30 do not interfere with each other.

The BT chip 20 and the BLE chip 30 share the Bluetooth antenna 60, and the Bluetooth antenna 60 is used to transmit and receive electromagnetic wave energy.

The main structure and connection relationship of the Bluetooth communication circuit are mainly introduced above, and its working principle will be introduced below.

In the Bluetooth communication circuit shown in FIG. 1 , only when one of the BT chip 20 and the BLE chip 30 is in the transmitting state and the other is in the receiving state, will the two interfere with each other; the BT chip 20 and the BLE chip 30 are in the transmitting state at the same time The BT chip 20 and the BLE chip 30 do not interfere when the two are in the receiving state, or in the receiving state at the same time, or when only one of the two is working and the other is not working.

In addition, although Bluetooth has 79 communication channels, the instantaneous communication has only one channel, and the instantaneous communication bandwidth is narrow. Therefore, the embodiment of the present invention can achieve high isolation between the BT chip 20 and the BLE chip 30 by using the method of suppressing point-frequency interference and utilizing the crony effect of the frequency band edge to suppress the interference in the entire instantaneous communication bandwidth.

In FIG. 1 , it is assumed that the BT chip 20 is in the transmitting state and the BLE chip 30 is in the receiving state. At this time, the influence of transmission on reception, that is, the influence of the BT chip 20 on the BLE chip 30 needs to be considered.

On the one hand, the circulator 50 can appropriately reduce the interference of the BT chip 20 to the BLE chip 30 .

On the other hand, a part of the signal is extracted from the transmission path of the BT chip 20 through the coupling unit 41 , and the extracted signal is equally divided into two signals of equal amplitude and in phase through the power distribution unit 43 .

After the equalized two-channel signal is phase-shifted by the phase-shifting unit 45, the frequency mixing unit 46 realizes the frequency mixing with the DC signal I provided by the MCU10; the other signal is directly mixed with the DC signal Q provided by the MCU10 through the frequency mixing unit 47. .

The above two mixed signals are combined into one through the power distribution unit 44 , and then coupled to the receiving channel of the BLE chip 30 through the coupling unit 42 .

The MCU 10 can control the amplitude and phase of the coupling signal without changing the frequency of the coupling signal output by the coupling unit 41 by adjusting the amplitudes of the DC signals I and Q (eg, adjusting the voltage). Therefore, by configuring specific amplitudes of the DC signals I and Q, the modulated signal and the signal leaked through the circulator 50 can be equal in amplitude and opposite in phase, thereby achieving mutual cancellation and increasing isolation.

It can be understood that when the phases of the modulated signal and the interference signal are opposite (the amplitude is not limited), the effect of suppressing the interference signal can be achieved. The signal works best.

The following will introduce the mathematical model of the above realization principle:

When the BT chip 20 is in the transmitting state and the BLE chip 30 is in the receiving state, the interference signal leaked from the circulator 50 or coupled to the receiving path of the BLE chip 30 is assumed to be:

It is assumed that the coupling unit 41 extracts part of the signal from the transmission path of the BT chip 20 as follows:

的相位角平移90°，变为

这两路信号分别经过混频单元46和混频单元47的混频处理、以及功率分配单元44的合并处理后，变为：Phase shifting unit 45, for the received signal

The phase angle of , shifted by 90°, becomes

After the two signals are processed by the frequency mixing unit 46 and the frequency mixing unit 47 respectively, and the combined processing by the power distribution unit 44, they become:

tan(ρ)=I/Q

It can be seen from the above formula that by adjusting the amplitude values of the DC signals I and Q, the following equation can be realized, that is, the signal modulated by the modulation module 40 has the same amplitude and opposite phase as the interference signal, which suppresses the interference signal. effect.

Of course, when the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, the principle of suppressing the interference of the BLE chip 30 to the BT chip 20 is similar to that described above, and the description is not repeated here.

In the embodiment of this specification, the MCU 10 stores a first mapping relationship, and the first mapping relationship is the Bluetooth communication channel, the amplitude of the DC signal I output by the mixing unit 46 , and the amplitude of the DC signal Q output by the mixing unit 47 . the mapping relationship between them.

Specifically, a corresponding table of the Bluetooth channel and the DC signal amplitudes I and Q can be established inside the MCU 10. When the BT chip 20 and the BLE chip 30 work on different channels, the MCU 10 can quickly find the values of I and Q by looking up the table. , so that the BT chip 20 and the BLE chip 30 do not interfere with each other in the entire bandwidth.

Optionally, the above-mentioned mapping relationship can be obtained by referring to the following methods: control the BT chip 20 to be in a transmitting state, transmit signals on a certain channel, the BLE chip 30 is in a receiving state, and receive on the same channel as the transmission path of the BT chip 20. At the same time, the MCU10 traverses and adjusts the amplitude values of I and Q with a certain precision, and determines the final amplitude values of I and Q based on the principle of the minimum interference signal received in the receiving channel and in the transmitting channel. At this time, I, Q The mapping relationship established with the channel.

In the bluetooth communication circuit provided by the embodiment of the present invention, multiple bluetooth chips share one antenna through a circulator, which realizes isolation between multiple bluetooth chips, avoids mutual interference between multiple bluetooth chips, and facilitates the realization of high integration of electronic equipment , miniaturization requirements; at the same time, the modulation module extracts the signal from the transmission path of the Bluetooth chip in the transmitting state, and modulates the signal and couples it to the receiving path of the Bluetooth chip in the receiving state to suppress the transmission path. The circulator is coupled to the interfering signal in the receive path, further reducing the interference between multiple Bluetooth chips.

It should be noted that the above embodiment is only introduced by taking two Bluetooth chips as an example. In fact, the electronic device may also include more than two Bluetooth chips. These multiple Bluetooth chips are connected to the Bluetooth antenna through a circulator. Modulation modules as shown in FIG. 1 can be respectively set between the radio frequency paths of the multiple Bluetooth chips to achieve mutual isolation between the multiple Bluetooth chips.

Based on the Bluetooth communication circuit provided by the above embodiments of the present invention, the present invention further provides an electronic device, the electronic device comprising the Bluetooth communication circuit described in any one of the foregoing embodiments.

The above electronic devices include but are not limited to mobile phones, tablet computers, personal digital processors, car computers, cameras, music players, laptop computers, e-book readers or navigators, etc.

The electronic device provided by the embodiments of the present invention can achieve the same or equivalent technical effects as the Bluetooth communication circuits introduced in the previous embodiments, and details are not repeated here.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on such understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art. The computer software products are stored in a storage medium (such as ROM/RAM, magnetic disk, etc.). , CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of the present invention.

The embodiments of the present utility model have been described above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned specific embodiments, which are only illustrative rather than restrictive, and the common technology in the field Under the inspiration of the present utility model, personnel can make many forms without departing from the scope of the present utility model and the protection scope of the claims, which all belong to the protection of the present utility model.

Claims (10)

1. a bluetooth communication circuit, is characterized in that, comprises: Multiple Bluetooth chips, circulators, Bluetooth antennas and modulation modules; among them, The plurality of Bluetooth chips are connected to the Bluetooth antenna through the circulator; The modulation module is used to extract a signal from the transmission path of the Bluetooth chip in the transmitting state, and after modulating the signal, it is coupled to the receiving path of the Bluetooth chip in the receiving state, so as to suppress the transmission path in the transmission path. The circulator is coupled to an interfering signal in the receive path. 2. The Bluetooth communication circuit according to claim 1, wherein the modulation module comprises a coupling unit and a phase shifting unit; wherein, The coupling unit is used to extract a signal from the transmission path of the Bluetooth chip in the transmission state, and couple the modulated signal to the reception path of the Bluetooth chip in the reception state; The phase shifting unit is used for performing phase shifting processing on the signal. 3 . The Bluetooth communication circuit according to claim 2 , wherein the modulated signal and the interference signal have opposite phases. 4 . 4. The Bluetooth communication circuit according to claim 3, wherein the modulation module further comprises a power distribution unit and a frequency mixing unit; wherein, The power distribution unit is configured to divide the signal into a first signal and a second signal; the phase-shifting unit, configured to perform phase-shift processing on the first signal; the frequency mixing unit, configured to perform frequency mixing processing on the second signal and the phase-shifted first signal; The power distribution unit is further configured to perform combining processing on the second signal after frequency mixing and the first signal after phase-shift mixing and output to the coupling unit. 5 . The Bluetooth communication circuit according to claim 4 , wherein the amplitudes of the modulated signal and the interference signal are equal. 6 . 6. The bluetooth communication circuit according to any one of claims 1 to 5, wherein the plurality of bluetooth chips comprise a first bluetooth chip and a second bluetooth chip, and the modulation module comprises a first coupling unit, a second Two coupling units, a first power distribution unit, a second power distribution unit, a phase shift unit, a first frequency mixing unit and a second frequency mixing unit; wherein The first coupling unit is connected to the first channel of the first Bluetooth chip, and the first power distribution unit is connected to the first coupling unit; The second coupling unit is connected to the second channel of the second Bluetooth chip, and the second power distribution unit is connected to the second coupling unit; the phase shifting unit and the first frequency mixing unit are connected in series between the first power distribution unit and the second power distribution unit; The second frequency mixing unit is connected between the first power distribution unit and the second power distribution unit. 7. The bluetooth communication circuit according to claim 6, wherein the bluetooth communication circuit further comprises a micro-control unit MCU; Both the first frequency mixing unit and the second frequency mixing unit are connected to the MCU, and the MCU is further configured to output a DC signal for the first frequency mixing unit and the second frequency mixing unit, respectively. 8 . The Bluetooth communication circuit according to claim 7 , wherein the MCU further stores a first mapping relationship, and the first mapping relationship is a Bluetooth communication channel and a direct current signal output by the first mixing unit. 9 . A mapping relationship between the amplitude and the amplitude of the DC signal output by the second frequency mixing unit. 9. The bluetooth communication circuit of claim 1, wherein the plurality of bluetooth chips comprise traditional bluetooth chips and low power bluetooth chips. 10. An electronic device, comprising the Bluetooth communication circuit according to any one of claims 1 to 9.

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