CN210694375U - Bluetooth communication circuit and electronic equipment - Google Patents
Bluetooth communication circuit and electronic equipment Download PDFInfo
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- CN210694375U CN210694375U CN201921999167.8U CN201921999167U CN210694375U CN 210694375 U CN210694375 U CN 210694375U CN 201921999167 U CN201921999167 U CN 201921999167U CN 210694375 U CN210694375 U CN 210694375U
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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
Technical Field
The embodiment of the utility model provides a relate to terminal technical field, especially relate to a bluetooth communication circuit and electronic equipment.
Background
Bluetooth has obvious advantages in the aspects of power consumption, networking and the like as a communication solution of the Internet of things. Based on the development trend of the internet of things, more and more electronic devices of the internet of things, such as mobile phones, smart home devices and smart wearable devices, are available in the follow-up process. The electronic device generally needs to satisfy the requirements of low power consumption and high speed, the low power consumption ensures the standby time of the electronic device, and the high speed enables the electronic device to realize rapid and large-scale data exchange.
In response to the above needs, there are two main solutions: in the first scheme, a dual-mode Bluetooth chip is adopted; and in the second scheme, the chips and the antennas of the classic Bluetooth and the low-power Bluetooth are designed separately. In the first scheme, although the classic Bluetooth and the low-power-consumption Bluetooth can work simultaneously, the classic Bluetooth and the low-power-consumption Bluetooth can interfere with each other when working simultaneously; the dual-antenna design of the second scheme 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 bluetooth communication requirements of multiple modes, such as low power consumption and high speed; moreover, the bluetooth in multiple communication modes is not interfered with each other, which is a technical problem to be solved urgently in the prior art.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a bluetooth communication circuit and electronic equipment to solve multiple communication mode's bluetooth mutual interference's among the electronic equipment problem.
In order to solve the above technical problem, the embodiment of the present invention is implemented as follows:
in a first aspect, a bluetooth communication circuit is provided, including:
the device comprises a plurality of Bluetooth chips, a circulator, a Bluetooth antenna and a modulation module; wherein the content of the first and second substances,
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.
In a second aspect, an electronic device is provided, which comprises a bluetooth communication circuit implementing the first aspect.
In the embodiment of the utility model, a plurality of bluetooth chips share one antenna through the circulator, thereby realizing the isolation among the bluetooth chips, avoiding the mutual interference among the bluetooth chips and being convenient for realizing the requirements of high integration and miniaturization of electronic equipment; meanwhile, the modulation module extracts a signal from a transmitting path of the Bluetooth chip in a transmitting state, modulates the signal and couples the modulated signal to a receiving path of the Bluetooth chip in a receiving state so as to inhibit interference signals in the receiving path and further reduce interference among a plurality of Bluetooth chips.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:
fig. 1 is a schematic diagram of a bluetooth communication circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 Micro Control Unit (MCU) 10 of the electronic device.
The bluetooth communication circuit mainly includes: the MCU10, the classic Bluetooth (BT) chip 20, the Bluetooth Low Energy (BLE) chip 30, the modulation module 40, the circulator 50, and the Bluetooth antenna 60, which will be described in detail below.
The MCU10 is mainly used for controlling and processing the states 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 frequency mixing units 46 and 47.
One end of the BT chip 20 is connected to the MCU10, and the other end is connected to the bluetooth antenna 60 through the circulator 50. The BT chip 20 is mainly used for modulating a baseband signal or demodulating a radio frequency signal.
The BT chip 20 may be a chip supporting the bluetooth protocol below 4.0, and is generally used in a transmission scenario where the data volume of the electronic device is large, such as: higher data volume transmissions such as voice, music, etc. The BT chip 20 may specifically be a conventional bluetooth chip or a high-speed bluetooth chip.
One end of BLE chip 30 is connected with MCU10, and the other end is connected with bluetooth antenna 60 through circulator 50. The BLE chip 30 is mainly used for modulating a baseband signal or demodulating a radio frequency signal.
BLE chip 30 may be a chip supporting bluetooth protocol 4.0 or higher, with the greatest feature being a reduction in 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 mixing unit 46, and a mixing unit 47.
The coupling unit 41 may be configured to extract a part of the signal from the transmission path of the BT chip 20 shown in the upper part of fig. 1 and deliver the extracted part of the signal to the power distribution unit 43 when the BT chip 20 is in the transmission state and the BLE chip 30 is in the reception state. The coupling unit 41 may be further configured 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 the signal into the receiving path of the BT chip 20 shown in the upper part of fig. 1.
The power distribution unit 43 may be configured to, when the BT chip 20 is in a transmitting state and the BLE chip 30 is in a receiving state, divide the signal output by the coupling unit 41 into two paths, and transmit the two paths to the phase shifting unit 45 and the frequency mixing unit 47; or when the BT chip 20 is in a receiving state and the BLE chip 30 is in a transmitting state, the two signals output by the phase shift unit 45 and the mixing unit 47 are combined and transmitted to the coupling unit 41.
The phase shifting unit 45 is mainly configured to perform phase shifting processing on the input signal, for example, shift the phase angle of the input signal by 90 °, where the input signal mentioned here may be a signal output by the power distributing unit 43 to the phase shifting unit 45 when the BT chip 20 is in the transmitting state and the BLE chip 30 is in the receiving state; the mixing unit 46 may also be a signal input 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.
The frequency mixing unit 46 mainly implements a frequency mixing function, and is mainly configured to perform frequency mixing processing on the alternating current signal output by the phase shifting unit 45 and the direct current signal I output by the MCU10 when the BT chip 20 is in a transmitting state and the BLE chip 30 is in a receiving state, and transmit the signals to the power distribution unit 44; or, the processing unit is configured to, when the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, perform mixing processing on the alternating current signal output by the power distribution unit 44 and the direct current signal I output by the MCU10, and send the signals to the phase shift unit 45.
The frequency mixing unit 47 mainly implements a frequency mixing function, and is mainly used for performing frequency mixing processing on the alternating current signal output by the power distribution unit 43 and the direct current signal Q output by the MCU10 when the BT chip 20 is in a transmitting state and the BLE chip 30 is in a receiving state, and transmitting the signals to the power distribution unit 44; or, the processing unit is configured to, when the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, perform mixing processing on the alternating current signal output by the power distribution unit 44 and the direct current signal Q output by the MCU10, and transmit the mixed signals to the power distribution unit 43.
The power distribution unit 44 may be configured to combine two paths of signals output by the frequency mixing unit 46 and the frequency mixing unit 47 when the BT chip 20 is in a transmitting state and the BLE chip 30 is in a receiving state, and transmit the combined signals 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 divided into two paths, and the two paths are transmitted to the frequency mixing unit 46 and the frequency mixing unit 47.
The coupling unit 42 may be configured 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 the signal into the receiving path of the BLE chip 30 shown in the lower portion of fig. 1. The coupling unit 42 may also be configured to extract a part of the signal from the transmission path of the BLE chip 30 shown in the lower portion of fig. 1 when the BT chip 20 is in the receiving state and the BLE chip 30 is in the transmitting state, and deliver the part of the signal to the power distribution unit 44.
The circulator 50 is mainly used to implement isolation between the BT chip 20 and the BLE chip 30, so that 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 described above, and the operation principle thereof will be described 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 a transmitting state and the other is in a receiving state, the two chips interfere with each other; when the BT chip 20 and the BLE chip 30 are in a transmitting state at the same time, or in a receiving state at the same time, or only one of the BT chip 20 and the BLE chip 30 is in operation and the other is not in operation, the BT chip 20 and the BLE chip 30 do not generate interference.
In addition, although the 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 provides a method for suppressing dot-frequency interference, which utilizes the skirt effect at the edge of the frequency band to achieve the suppression effect on the interference in the entire instantaneous communication bandwidth, and can realize the high isolation of the BT chip 20 and the BLE chip 30.
In fig. 1, assuming that the BT chip 20 is in a transmitting state and the BLE chip 30 is in a receiving state, the effect of transmission on reception, i.e., the effect of the BT chip 20 on the BLE chip 30, needs to be considered.
In one aspect, interference of BT chip 20 on BLE chip 30 may be suitably reduced by circulator 50.
On the other hand, a partial signal is extracted from the transmission path of the BT chip 20 by the coupling unit 41, and the extracted signal is divided equally into two paths of signals with equal amplitude and in phase by the power dividing unit 43.
One path of the two paths of split signals is subjected to phase shifting through a phase shifting unit 45, and then frequency mixing with a direct current signal I provided by the MCU10 is realized through a frequency mixing unit 46; the other signal is directly mixed with the dc signal Q provided by the MCU10 by the mixing unit 47.
The two mixed signals are combined into one path through the power distribution unit 44, and then coupled to the receiving path of the BLE chip 30 through the coupling unit 42.
The MCU10 can control the amplitude and phase of the coupling signal without changing the frequency of the coupling signal output from the coupling unit 41 by adjusting the amplitude of the dc signals I and Q (e.g., adjusting the voltage). Therefore, by configuring the specific amplitudes of the dc signals I and Q, the modulated signals and the signals leaked through the circulator 50 can be equal in amplitude and opposite in phase, thereby achieving the effects of canceling each other and increasing the isolation.
It is understood that when the modulated signal and the interference signal are opposite in phase (without limitation to amplitude), the effect of suppressing the interference signal can be achieved, and of course, when the modulated signal and the interference signal are opposite in phase and equal in amplitude, the effect of suppressing the interference signal is most preferable.
The mathematical model for the above implementation principle will be described below:
when BT chip 20 is in the transmitting state and BLE chip 30 is in the receiving state, the interference signal leaking from circulator 50 or coupling into the receive path of BLE chip 30 is assumed to be:
the coupling unit 41 extracts partial signals from the transmission path of the BT chip 20 assuming that:
a phase shift unit 45 for shifting the received signal
Is shifted by 90 deg. to become
These two signals are respectively subjected to the mixing processing by the mixing unit 46 and the mixing unit 47, and the combining processing by the power distribution unit 44, and then become:
tan(ρ)＝I/Q
as can be seen from the above formula, 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 with the interference signal, and plays a role in suppressing the interference signal.
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 on the BT chip 20 is similar to the above description, and the description is not repeated here.
In the embodiment of the present specification, the MCU10 holds a first mapping relationship among the bluetooth communication channel, the amplitude of the dc signal I output for the frequency mixing unit 46, and the amplitude of the dc signal Q output for the frequency mixing unit 47.
Specifically, a corresponding table of the bluetooth channel and the dc signal amplitudes I and Q may be established inside the MCU10, and when the BT chip 20 and the BLE chip 30 operate in different channels, the MCU10 may quickly find out 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 whole bandwidth.
Alternatively, the mapping relationship may be obtained by referring to the following ways: controlling the BT chip 20 to be in a transmitting state and transmit a signal on a certain channel, and controlling the BLE chip 30 to be in a receiving state and receive a signal on the same channel as a transmitting path of the BT chip 20; meanwhile, the MCU10 traverses and adjusts the I and Q amplitude values with a certain precision, and determines the final I and Q amplitude values based on the principle that the interference signal received in the receiving path in the transmitting path is the minimum, and the mapping relationship between the I, Q and the channel at this time is established.
The embodiment of the utility model provides a bluetooth communication circuit, a plurality of bluetooth chips pass through circulator and share an antenna, have realized the isolation between a plurality of bluetooth chips, avoid mutual interference between a plurality of bluetooth chips, and be convenient for realize the requirement of high integration, miniaturization of electronic equipment; meanwhile, the modulation module extracts a signal from a transmitting path of the Bluetooth chip in a transmitting state, modulates the signal and couples the modulated signal to a receiving path of the Bluetooth chip in a receiving state, so that an interference signal coupled to the receiving path through a circulator in the transmitting path is suppressed, and the interference among a plurality of Bluetooth chips is further reduced.
It should be noted that the above embodiment is described by taking only two bluetooth chips as an example, actually, the electronic device may further include more than 2 bluetooth chips, the multiple bluetooth chips are connected to the bluetooth antenna through a circulator, and the modulation modules shown in fig. 1 may be respectively disposed between every two radio frequency paths of the multiple bluetooth chips to achieve mutual isolation between the multiple bluetooth chips.
Based on the utility model discloses bluetooth communication circuit that above-mentioned embodiment provided, the utility model discloses still provide an electronic equipment, this electronic equipment includes the bluetooth communication circuit as described in an arbitrary embodiment in the foregoing.
The 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.
The embodiment of the utility model provides an electronic equipment can reach the same or equivalent technological effect of bluetooth communication circuit who introduces in several embodiments in the foregoing, no longer gives unnecessary details here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention essentially or the portions contributing to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), and includes a plurality of instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (10)
1. A bluetooth communication circuit, comprising:
the device comprises a plurality of Bluetooth chips, a circulator, a Bluetooth antenna and a modulation module; wherein the content of the first and second substances,
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.
2. The bluetooth communication circuit of claim 1, wherein the modulation module comprises a coupling unit and a phase shifting unit; wherein the content of the first and second substances,
the coupling unit is used for extracting signals from a transmitting path of the Bluetooth chip in a transmitting state and coupling the modulated signals into a receiving path of the Bluetooth chip in a receiving state;
and the phase shift unit is used for performing phase shift processing on the signal.
3. The bluetooth communication circuit of claim 2, wherein the modulated signal and the interfering signal are in opposite phases.
4. The bluetooth communication circuit according to claim 3, wherein the modulation module further comprises a power distribution unit and a mixing unit; wherein the content of the first and second substances,
the power distribution unit is used for dividing the signal into a first signal and a second signal;
the phase shifting unit is used for performing phase shifting processing on the first signal;
the frequency mixing unit is used for performing frequency mixing processing on the second signal and the first signal after phase shifting processing;
the power distribution unit is further configured to combine the second signal after the frequency mixing processing and the first signal after the phase shifting and frequency mixing processing, and output the combined signal to the coupling unit.
5. The bluetooth communication circuit of claim 4, wherein the amplitude of the modulated signal and the interfering signal are equal.
6. The bluetooth communication circuit according to any one of claims 1 to 5, wherein the plurality of bluetooth chips includes a first bluetooth chip and a second bluetooth chip, and the modulation module includes a first coupling unit, a second coupling unit, a first power distribution unit, a second power distribution unit, a phase shift unit, and a first mixing unit and a second mixing unit; wherein
The first coupling unit is connected with a first path of the first Bluetooth chip, and the first power distribution unit is connected with the first coupling unit;
the second coupling unit is connected with a second path of the second Bluetooth chip, and the second power distribution unit is connected with the second coupling unit;
the phase shift unit and the first mixing unit are connected in series between the first power distribution unit and the second power distribution unit;
the second 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);
the first frequency mixing unit and the second frequency mixing unit are both connected with the MCU, and the MCU is further used for outputting direct current signals 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 maintains a first mapping relationship between bluetooth communication channels, amplitudes of the dc signals output from the first mixing unit, and amplitudes of the dc signals output from the second mixing unit.
9. The bluetooth communication circuit of claim 1, wherein the plurality of bluetooth chips comprises a legacy bluetooth chip and a bluetooth low energy chip.
10. An electronic device comprising the bluetooth communication circuit of any one of claims 1 to 9.
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| CN201921999167.8U CN210694375U (en) | 2019-11-18 | 2019-11-18 | Bluetooth communication circuit and electronic equipment |
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| CN201921999167.8U CN210694375U (en) | 2019-11-18 | 2019-11-18 | Bluetooth communication circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111935683A (en) * | 2020-07-15 | 2020-11-13 | 广东科徕尼智能科技有限公司 | Bluetooth equipment terminal, signal expansion transmission method and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111935683A (en) * | 2020-07-15 | 2020-11-13 | 广东科徕尼智能科技有限公司 | Bluetooth equipment terminal, signal expansion transmission method and storage medium |
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