CN212210996U - Signal processing circuit and communication equipment - Google Patents
Signal processing circuit and communication equipment Download PDFInfo
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- CN212210996U CN212210996U CN202020464502.0U CN202020464502U CN212210996U CN 212210996 U CN212210996 U CN 212210996U CN 202020464502 U CN202020464502 U CN 202020464502U CN 212210996 U CN212210996 U CN 212210996U
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Abstract
The utility model discloses a signal processing circuit, include: the antenna comprises an antenna, a receiving circuit, a transmitting circuit, a gating circuit, a radio frequency transceiver, an antenna switch, an attenuation circuit and a first coupling circuit; the input end of the antenna switch is connected with the output end of the radio frequency transceiver through the transmitting circuit, the output end of the antenna switch is connected with the first input end of the radio frequency transceiver through the receiving circuit, the signal transceiving end of the antenna switch is connected with the first coupling circuit, and the first coupling circuit is also connected with the input ends of the antenna and the attenuation circuit respectively; the first gating end of the gating circuit is connected with the output end of the attenuation circuit, the second gating end of the gating circuit is connected with the signal coupling end of the transmitting circuit, and the output end of the gating circuit is connected with the second input end of the radio frequency transceiver. The embodiment of the utility model provides a still disclose a communication equipment, effectively solve receiving circuit and receive blocking signal and lead to the unusual problem of radio frequency transceiver and receiving circuit work.
Description
Technical Field
The utility model relates to the field of communication technology, especially, relate to a signal processing circuit and communication equipment.
Background
Referring to fig. 1, communication devices currently receive various forms of wireless signals, where information that is desired is a wanted signal and other information that is not desired is a wanted signal. Generally, in order to avoid unwanted signals in the environment, a filter circuit is disposed in the receiving path to filter unwanted signals with different frequencies from the wanted signals (the unwanted signals are attenuated to significantly reduce the power of the unwanted signals), so as to ensure stable operation of the receiving circuit and the rf transceiver.
However, two problems inevitably exist in practical applications of communication devices:
1. many unwanted signals may have the same frequency as the desired signal or very close to the desired signal, and the filter itself cannot distinguish between the desired signal and unwanted signals having the same frequency, i.e. unwanted signals having the same frequency as the desired signal may also normally pass through the filter without being attenuated and reach the next stage of circuitry (e.g. a low noise amplifier). But also the attenuation capability of the filter is very limited for unwanted signals with frequencies very close to the frequency of the wanted signal. Such unwanted signals, which have a frequency close to or the same as the frequency of the wanted signal and a high signal strength, are collectively referred to herein as blocking signals. Therefore, when the communication device encounters a condition where the blocking signal power is too high, the low noise amplifier or the radio frequency transceiver is saturated and abnormal operation occurs.
2. The power of the signal received by the low noise amplifier or the radio frequency transceiver is limited, and the low noise amplifier or the radio frequency transceiver is saturated by the signal with too high strength, so that the performance of the device is remarkably reduced and even the device is directly damaged, and the communication equipment is abnormally operated.
Disclosure of Invention
The embodiment of the utility model provides a signal processing circuit and communication equipment can effectively solve receiving circuit and receive blocking signal and lead to the unusual problem of radio frequency transceiver and receiving circuit work.
In order to achieve the above object, an embodiment of the present invention provides a signal processing circuit, including: the antenna comprises an antenna, a receiving circuit for receiving communication signals, a transmitting circuit for transmitting the communication signals, a gating circuit for gating according to the working state of the transmitting circuit, a radio frequency transceiver for carrying out power detection on the received communication signals, an antenna switch for controlling the antenna to communicate with the receiving circuit according to the detection result of the radio frequency transceiver, an attenuation circuit, and a first coupling circuit for receiving the communication signals transmitted by the antenna and sending the communication signals to the attenuation circuit;
the input end of the antenna switch is connected with the output end of the radio frequency transceiver through the transmitting circuit, the output end of the antenna switch is connected with the first input end of the radio frequency transceiver through the receiving circuit, the signal transceiving end of the antenna switch is connected with the first coupling circuit, and the first coupling circuit is also connected with the input ends of the antenna and the attenuation circuit respectively;
the first gating end of the gating circuit is connected with the output end of the attenuation circuit, the second gating end of the gating circuit is connected with the signal coupling end of the transmitting circuit, and the output end of the gating circuit is connected with the second input end of the radio frequency transceiver.
As an improvement of the above scheme, the signal input priority of the second gating end of the gating circuit is higher than the signal input priority of the first gating end of the gating circuit.
As an improvement of the above aspect, the transmission circuit includes: a power amplifier and a second coupling circuit;
the input end of the power amplifier is connected with the output end of the radio frequency transceiver, the output end of the power amplifier is connected with the input end of the second coupling circuit, the first output end of the second coupling circuit is connected with the input end of the antenna switch, and the second output end of the second coupling circuit is connected with the second gating end of the gating circuit.
As an improvement of the above aspect, the receiving circuit includes: a low noise amplifier and a filter circuit;
the output end of the low-noise amplifier is connected with the first input end of the radio frequency transceiver, the input end of the low-noise amplifier is connected with the output end of the filter circuit, and the input end of the filter circuit is connected with the output end of the antenna switch.
As an improvement of the above aspect, the attenuation circuit includes: an attenuation network.
As an improvement of the above aspect, the gate circuit includes: an alternative gate and a single-pole double-throw switch.
Compared with the prior art, the utility model discloses a signal processing circuit, after the antenna received communication signal, sends communication signal to first coupling circuit, sends communication signal after the coupling to decay circuit and carries out attenuation treatment, passes through gating circuit and defeated radio frequency transceiver again, confirms according to the power testing result of radio frequency transceiver and judges whether received communication signal is useful signal, if for useful signal then antenna switch switches on to make antenna and receiving circuit communicate; if the signal is a blocking signal, the antenna switch maintains the off state. After the transmitting circuit works, the gating circuit gates the second gating end to receive the communication signal coupled by the transmitting circuit and transmits the communication signal to the radio frequency transceiver, and judges whether the power output by the transmitting circuit meets the signal transmission requirement or not according to the power detection result of the radio frequency transceiver, so that the output power of the transmitting circuit is adjusted. Therefore, when the antenna receives a signal with high communication signal strength, the coupled communication signal is attenuated by the attenuation circuit, and the problem that the gating circuit and the radio frequency transceiver are damaged due to overlarge signals is solved. Meanwhile, the received communication signal is subjected to power detection through the radio frequency transceiver, whether the current communication signal is a useful signal or not is judged, and whether the antenna switch is conducted or not is selected, so that the problem that the radio frequency transceiver and the receiving circuit work abnormally due to the fact that the receiving circuit receives a blocking signal is solved, and the working stability of the communication equipment is improved.
The embodiment of the utility model provides a still provide a communication equipment, include the embodiment of the utility model provides a signal processing circuit.
Compared with the prior art, the utility model discloses a communication equipment is owing to adopted the embodiment of the utility model provides a signal processing circuit has avoided receiving circuit to receive blocking signal and has leaded to the unusual problem of radio frequency receiving ware and receiving circuit work to communication equipment job stabilization nature has been improved.
Drawings
Fig. 1 is a schematic structural diagram of a signal processing circuit in the prior art of the present invention;
fig. 2 is a schematic structural diagram of a signal processing 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 only some embodiments of the present invention, not all embodiments. 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.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
Fig. 2 is a schematic structural diagram of a signal processing circuit according to an embodiment of the present invention.
The embodiment of the utility model provides a signal processing circuit, include: the antenna comprises an antenna 7, a receiving circuit 4 for receiving communication signals, a transmitting circuit 3 for transmitting the communication signals, a gating circuit 2 for gating according to the working state of the transmitting circuit 3, a radio frequency transceiver 1 for detecting the power of the received communication signals, an antenna switch 6 for controlling the antenna 7 to communicate with the receiving circuit 4 according to the detection result of the radio frequency transceiver 1, an attenuation circuit 5, and a first coupling circuit 8 for receiving the communication signals sent by the antenna 7 and transmitting the communication signals to the attenuation circuit 5.
In this embodiment, the attenuation circuit 5 is an attenuation network, and may also be another attenuation circuit 5, which is not limited herein; the first coupling circuit 8 is a coupler; the radio frequency transceiver 1 may be provided with a power detection chip inside to perform power detection on the received communication signal, and it can be understood that power detection is a common technology in the prior art and is not described herein again. The gate circuit 2 includes: the two-select gate and the single-pole double-throw switch may also be a switch circuit such as an analog switch, and are not limited herein. It can be understood that, the signal processing circuit in the embodiment of the present invention can not only adopt the antenna switch 6, but also adopt the duplexer to implement in practical applications.
The input end of the antenna switch 6 is connected to the output end of the radio frequency transceiver 1 through the transmitting circuit 3, the output end of the antenna switch 6 is connected to the first input end of the radio frequency transceiver 1 through the receiving circuit 4, the signal transceiving end of the antenna switch 6 is connected to the first coupling circuit 8, and the first coupling circuit 8 is further connected to the input ends of the antenna 7 and the attenuating circuit 5, respectively.
The first gating end of the gating circuit 2 is connected with the output end of the attenuation circuit 5, the second gating end of the gating circuit 2 is connected with the signal coupling end of the transmitting circuit 3, and the output end of the gating circuit 2 is connected with the second input end of the radio frequency transceiver 1.
The gating circuit 2 is configured to gate according to the operating state of the transmitting circuit 3, and specifically, when the transmitting circuit 3 operates, the gating circuit 2 gates the second gating end to connect with the transmitting circuit 3, so that the radio frequency transceiver 1 performs power detection. That is, when the transmission circuit 3 does not operate, the gating circuit 2 gates the first gating terminal to be connected to the attenuation circuit 5. Through the gating circuit 2, the communication equipment can realize power detection when transmitting signals and receiving signals, so that the working stability of the communication equipment is improved.
The attenuation circuit 5 has a preset attenuation value, which is 10dB in this embodiment, and may be set as necessary, that is, the actual power value of the communication signal subjected to power detection by the radio frequency transceiver 1 is the measurement power value + the attenuation value. The maximum acceptable power of the receiving circuit 4 or the rf transceiver 1 itself for receiving signals is set by the factory hardware. Specifically, the set attenuation value and the maximum power value are both recorded in a register.
The working principle is as follows:
after receiving the communication signal, the antenna 7 sends the communication signal to the first coupling circuit 8, sends the coupled communication signal to the attenuation circuit 5 for attenuation, and then transmits the signal to the radio frequency transceiver 1 through the gating circuit 2, judges whether the received communication signal is a useful signal according to the power detection result of the radio frequency transceiver 1, and if the received communication signal is a useful signal, the antenna switch 6 is switched on to communicate the antenna 7 with the receiving circuit 4; if the signal is a blocking signal, the antenna switch 6 is kept in an off state. After the transmitting circuit 3 works, the gating circuit 2 gates the second gating terminal to receive the communication signal of the transmitting circuit 3 and transmits the communication signal to the radio frequency transceiver 1, and judges whether the power output by the transmitting circuit 3 meets the signal transmission requirement or not according to the power detection result of the radio frequency transceiver 1, so that the output power of the transmitting circuit 3 is adjusted. Therefore, when the antenna 7 receives a signal with high communication signal strength, the attenuation circuit 5 attenuates the coupled communication signal, so that the problem that the gating circuit 2 and the radio frequency transceiver 1 are damaged due to an overlarge signal is solved. Meanwhile, the power of the received communication signal is detected through the radio frequency transceiver 1, whether the current communication signal is a useful signal or not is judged, and whether the antenna switch 6 is conducted or not is selected, so that the problem that the radio frequency transceiver 1 and the receiving circuit 4 work abnormally due to the fact that the receiving circuit 4 receives a blocking signal is solved, and the working stability of the communication equipment is improved. And the increased hardware occupies a small circuit board size, even though a small communication device is still suitable.
As an improvement of the above scheme, the signal input priority of the second gating terminal of the gating circuit 2 is higher than the signal input priority of the first gating terminal of the gating circuit 2.
Specifically, when the transmitting circuit 3 is in operation (i.e. the communication device is in a state of transmitting signals at this time), the gating circuit 2 gates the transmitting circuit 3, and the radio frequency transceiver 1 detects the communication signals of the transmitting circuit 3 to determine whether the power output by the transmitting circuit 3 meets the requirement, so as to adjust the output power of the transmitting circuit 3. It will be appreciated that when the transmitting circuit 3 is in operation, then power detection of the communication signal of the transmitting circuit 3 is prioritized.
As a modification of the above, the transmission circuit 3 includes: a power amplifier 31 and a second coupling circuit 32. In this embodiment, the second coupling circuit 32 is a coupler, and may be other coupling circuits, which is not limited herein.
The input end of the power amplifier 31 is connected to the output end of the radio frequency transceiver 1, the output end of the power amplifier 31 is connected to the input end of the second coupling circuit, the first output end of the second coupling circuit 32 is connected to the input end of the antenna switch 6, and the second output end of the second coupling circuit 32 is connected to the second gating end of the gating circuit 2.
In the present embodiment, the signal is amplified by the power amplifier 31 and coupled by the second coupling circuit 32, and the coupled signal is sent to the gating circuit 2, so that the rf transceiver 1 performs power detection on the signal.
As a modification of the above, the receiving circuit 4 includes: a low noise amplifier 41 and a filter circuit 42. In this embodiment, the filter circuit 42 is a filter, and may be another filter circuit, which is not limited herein.
The output terminal of the low noise amplifier 41 is connected to the first input terminal of the radio frequency transceiver 1, the input terminal of the low noise amplifier 41 is connected to the output terminal of the filter circuit 42, and the input terminal of the filter circuit 42 is connected to the output terminal of the antenna switch 6.
In the present embodiment, the maximum power that the low noise amplifier 41 can accept is set when the hardware is shipped from the factory, and therefore, when the received communication signal is greater than the maximum power, the low noise amplifier 41 is prone to hardware damage. After the radio frequency transceiver 1 detects the received communication signal, if the actual power value is greater than the maximum power of the low noise amplifier 41 or the maximum power of the radio frequency transceiver 1, it indicates that the communication signal is a blocking signal and the power is too high, the antenna switch 6 maintains the off state; if the actual power value is smaller than the maximum power of the low noise amplifier 41 or the maximum power of the rf transceiver 1, it indicates that the communication signal is a useful signal, and the antenna switch 6 connects the antenna 7 and the receiving circuit 4. Wherein, the actual power value is the measured power value + the attenuation value.
The embodiment of the utility model provides a still provide a communication equipment, include the embodiment of the utility model provides a signal processing circuit.
It should be noted that the communication device may be a mobile phone, a tablet computer, a wireless router, a CPE, an intercom, or the like.
Compared with the prior art, the utility model discloses a communication equipment is owing to adopted the embodiment of the utility model provides a signal processing circuit has avoided receiving circuit 4 to receive blocking signal and has leaded to the unusual problem of radio frequency transceiver 1 and receiving circuit 4 work to communication equipment job stabilization nature has been improved.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (7)
1. A signal processing circuit, comprising: the antenna comprises an antenna, a receiving circuit for receiving communication signals, a transmitting circuit for transmitting the communication signals, a gating circuit for gating according to the working state of the transmitting circuit, a radio frequency transceiver for carrying out power detection on the received communication signals, an antenna switch for controlling the antenna to communicate with the receiving circuit according to the detection result of the radio frequency transceiver, an attenuation circuit, and a first coupling circuit for receiving the communication signals transmitted by the antenna and sending the communication signals to the attenuation circuit;
the input end of the antenna switch is connected with the output end of the radio frequency transceiver through the transmitting circuit, the output end of the antenna switch is connected with the first input end of the radio frequency transceiver through the receiving circuit, the signal transceiving end of the antenna switch is connected with the first coupling circuit, and the first coupling circuit is also connected with the input ends of the antenna and the attenuation circuit respectively;
the first gating end of the gating circuit is connected with the output end of the attenuation circuit, the second gating end of the gating circuit is connected with the signal coupling end of the transmitting circuit, and the output end of the gating circuit is connected with the second input end of the radio frequency transceiver.
2. The signal processing circuit of claim 1, wherein a signal input priority of the second gating terminal of the gating circuit is higher than a signal input priority of the first gating terminal of the gating circuit.
3. The signal processing circuit of claim 1, wherein the transmit circuit comprises: a power amplifier and a second coupling circuit;
the input end of the power amplifier is connected with the output end of the radio frequency transceiver, the output end of the power amplifier is connected with the input end of the second coupling circuit, the first output end of the second coupling circuit is connected with the input end of the antenna switch, and the second output end of the second coupling circuit is connected with the second gating end of the gating circuit.
4. The signal processing circuit of claim 2, wherein the receive circuit comprises: a low noise amplifier and a filter circuit;
the output end of the low-noise amplifier is connected with the first input end of the radio frequency transceiver, the input end of the low-noise amplifier is connected with the output end of the filter circuit, and the input end of the filter circuit is connected with the output end of the antenna switch.
5. The signal processing circuit of claim 1, wherein the attenuation circuit comprises: an attenuation network.
6. The signal processing circuit of claim 1, wherein the gating circuit comprises: an alternative gate and a single-pole double-throw switch.
7. A communication device, characterized in that it comprises a signal processing circuit according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020464502.0U CN212210996U (en) | 2020-04-01 | 2020-04-01 | Signal processing circuit and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020464502.0U CN212210996U (en) | 2020-04-01 | 2020-04-01 | Signal processing circuit and communication equipment |
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| Publication Number | Publication Date |
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| CN212210996U true CN212210996U (en) | 2020-12-22 |
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| CN202020464502.0U Active CN212210996U (en) | 2020-04-01 | 2020-04-01 | Signal processing circuit and communication equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315536A (en) * | 2021-05-28 | 2021-08-27 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
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2020
- 2020-04-01 CN CN202020464502.0U patent/CN212210996U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315536A (en) * | 2021-05-28 | 2021-08-27 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
| CN113315536B (en) * | 2021-05-28 | 2022-04-29 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
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Effective date of registration: 20220616 Address after: 200000 5th floor, No. 1 and 5, Lane 168, Xumin Road, Qingpu District, Shanghai Patentee after: Shanghai LianHong Technology Co.,Ltd. Address before: 518000 the 1st and 3rd floors of the south section of building 24 and the 1st-4th floor of the north section of building 28, Shennan Road Science and Technology Park, Nanshan District, Shenzhen City, Guangdong Province Patentee before: TP-LINK TECHNOLOGIES Co.,Ltd. |