A method for integrating noise isolation of beidou radio frequency baseband

Abstract

The application discloses a kind of Beidou radio frequency baseband integrated noise isolation method, belong to radio frequency baseband integrated noise isolation method technical field, the scheme is made in the process of radio frequency baseband circuit module in equipment, for its manufacturing environment, process, working mode etc., simplify radio frequency baseband circuit module circuit while also reduce the complexity degree of circuit board, reduce power consumption, so that electromagnetic compatibility, anti-interference ability effectively improves, by shielding module to interference source produces strong sensitivity, to enhance the ability of each component anti-interference, simultaneously for radio frequency circuit module has been adopted deep N well substrate isolation, P+ protection ring and high resistance substrate isolation ring combination method, substantially reduce the coupling of substrate noise, reach good isolation effect, simultaneously, the digital power supply of chip, ground and radio frequency analog power supply, ground are independent of each other, to avoid the noise coupling crosstalk on power line, ground wire.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radio frequency baseband integrated noise isolation method, more particularly to a Beidou radio frequency baseband integrated noise isolation method. BACKGROUND

[0002] With the increasing popularity of satellite navigation, users have higher requirements for the safety and reliability of receiver terminals and the anti-interference ability, and it is necessary to prevent interference signals from mixing with signals to be received and processed by the radio frequency circuit, and effectively reducing electromagnetic interference on the system has become a key technology for continuously improving product economic benefits.

[0003] Due to the frequency conversion part between the anti-interference processing module in the radio frequency baseband and the baseband processing module, mainly due to too many amplifier stages in transmission, causing interference modulation and mutual modulation, or the insertion point of the amplifier is too early or too late, causing the input signal of the amplifier to be too strong or too weak, or the level of each radio frequency signal at the input end of the mixer is too different, or the noise coefficient of the selected amplifier is too high, resulting in direct communication and command transmission of the radio frequency circuit being implemented through electromagnetic signals. Once unable to resist interference, it cannot work normally, which will affect the system operation and further affect the user terminal.

[0004] Therefore, in view of the above problems, a Beidou radio frequency baseband integrated noise isolation method is proposed. SUMMARY

[0005] 1. Technical problem to be solved

[0006] In view of the problems in the prior art, the purpose of the present application is to provide a Beidou radio frequency baseband integrated noise isolation method, which can realize the monitoring of the interference source in the working state of each element through multiple shielding modules, and generate strong sensitivity to the interference source through the shielding module, thereby enhancing the anti-interference ability of each element. At the same time, by using the method of deep N-well substrate isolation, P+ protection ring and high resistance substrate isolation ring combination in the radio frequency circuit module, the coupling of substrate noise is greatly reduced, and good isolation effect is achieved.

[0007] 2. Technical scheme

[0008] In order to solve the above problems, the present application adopts the following technical scheme.

[0009] A Beidou radio frequency baseband integrated noise isolation method, comprising the following steps:

[0010] S1: Change the crosstalk mode between the received signal module and the electromagnetic interference signal in the radio frequency baseband circuit module circuit board, and divide the radio frequency circuit module into multiple shielding modules;

[0011] S2: Analyzing the working state of each element through multiple shielding modules, and forming the sensitivity to the interference source;

[0012] S3: Implementing mutual shielding processing for circuits with different functions and different working frequency bands in each element;

[0013] S4: Ensuring a consistent arrangement direction during the circuit layout process of the radio frequency baseband circuit module, and checking the solder joints;

[0014] S5: Deep N-well substrate isolation, P+ protection ring, and high-resistance substrate isolation ring are combined in the radio frequency baseband circuit module.

[0015] Further, in S1, the radio frequency baseband circuit module needs to transmit and receive data and signals through high-frequency channels. The way to change the crosstalk between the receiving signal module and the electromagnetic interference signal is to make it resistant to interference.

[0016] Further, in S1, multiple shielding modules are divided in the radio frequency circuit module. During the division, the actual functional units of the circuit should be strictly followed. The actual performance of each element should be fully mastered. After understanding the function of the element in the circuit, the working state and the sensitivity to the interference source are carefully analyzed.

[0017] Further, in S2, multiple shielding modules should be considered and concerned about the electromagnetic compatibility of the radio frequency baseband circuit module printed circuit board. Based on comprehensive consideration, the electromagnetic compatibility maintains the maximum reduction of electromagnetic signal radiation rate, thereby significantly enhancing the anti-interference effect of the radio frequency baseband circuit module.

[0018] Further, in S3, the circuits of different elements produce different functions. Different functions of the circuit will produce mutual interference. The main circuits are the oscillator circuit or the amplifier circuit. A shielding design should be implemented during the design of these circuits.

[0019] Further, in S4, during the circuit layout process of the radio frequency baseband circuit module, electromagnetic compatibility analysis and anti-interference design should be implemented. The layout of elements can affect the working state of each element in the entire circuit. One of the main sources of interference is the interaction between elements. The basic principle of wiring design should be paid attention to, that is, a consistent arrangement direction should be ensured during the wiring process, and incorrect soldering problems should be strictly prohibited during the circuit board processing link.

[0020] Further, in S5, deep N-well substrate isolation is constructed by building an N-well around and below the P-well of the device. N-channel devices operate in the P-well. Both P-well and deep N-well require taps.

[0021] Further, the P+ protection ring and high resistance substrate isolation ring in S5 protect the ring by creating a low resistance ring in the well or substrate around the device, and the protection ring leads to multiple contacts, connecting the metal ring to the N+ ring.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the advantages of the present application are:

[0024] (1) The scheme simplifies the circuit of the radio frequency baseband circuit module and reduces the complexity of the circuit board, reduces power consumption, effectively improves electromagnetic compatibility and anti-interference ability by discarding the anti-interference processing module in the traditional anti-interference receiver and the frequency conversion part between the baseband processing module during the manufacturing process of the radio frequency baseband circuit module in the device, and by dividing multiple shielding modules in the radio frequency circuit module. The shielding modules monitor the sensitivity of the interference sources of the working state of the elements. The interference sources are mainly due to the interference of the interference signal to the circuit and system of the radio frequency baseband. The shielding module has strong sensitivity to the interference source, thereby enhancing the anti-interference ability of each element.

[0025] (2) The scheme uses a combination of deep N-well substrate isolation, P+ protection ring and high resistance substrate isolation ring in the radio frequency circuit module, which greatly reduces the coupling of substrate noise and achieves good isolation effect. At the same time, the digital power supply and ground of the chip are independent of the radio frequency analog power supply and ground, thereby avoiding the noise coupling crosstalk on the power supply line and ground line. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The flowchart of the method for noise isolation of the Beidou radio frequency baseband of the present application is shown in the figure. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Embodiment 1:

[0031] Please refer to Figure 1 A method for isolating noise of a Beidou radio frequency baseband, comprising the following steps:

[0032] S1: Change the way of crosstalk between the receiving signal module and the electromagnetic interference signal in the radio frequency baseband circuit module circuit board, divide the radio frequency circuit module into multiple shielding modules;

[0033] S2: Analyze the working state of each element through the multiple shielding modules, and form the sensitivity degree according to the interference source;

[0034] S3: Implement mutual shielding processing for circuits with different functions and different working frequency bands in each element;

[0035] S4: During the circuit layout process of the radio frequency baseband circuit module, a consistent arrangement direction should be ensured, and the welding points should be checked;

[0036] S5: Deep N-well substrate isolation, P+ protection ring and high resistance substrate isolation ring are combined in the radio frequency baseband circuit module.

[0037] In S1, because the radio frequency baseband circuit module needs to transmit and receive data and signals, it is developed through a high frequency band, the way of crosstalk between the receiving signal module and the electromagnetic interference signal is changed, so that it has anti-interference.

[0038] The scheme simplifies the circuit of the radio frequency baseband circuit module and reduces the complexity of the circuit board, reduces power consumption, effectively improves electromagnetic compatibility and anti-interference capability, and enhances the anti-interference capability of each element through the shielding module.

[0039] The shielding module in the radio frequency circuit module is divided into multiple shielding modules, and the shielding module should be strictly expanded according to the actual function unit of the circuit during expansion. The actual performance of each element is fully mastered, and the sensitivity of the interference source is formed after the function of the element in the circuit is understood and the working state is carefully analyzed.

[0040] The shielding module in the radio frequency circuit module is divided into multiple shielding modules, and the shielding module should be strictly expanded according to the actual function unit of the circuit during expansion. The actual performance of each element is fully mastered, and the sensitivity of the interference source is formed after the function of the element in the circuit is understood and the working state is carefully analyzed.

[0041] The shielding module in the radio frequency circuit module is divided into multiple shielding modules, and the shielding module should be strictly expanded according to the actual function unit of the circuit during expansion. The actual performance of each element is fully mastered, and the sensitivity of the interference source is formed after the function of the element in the circuit is understood and the working state is carefully analyzed.

[0042] The shielding module in the radio frequency circuit module is divided into multiple shielding modules, and the shielding module should be strictly expanded according to the actual function unit of the circuit during expansion. The actual performance of each element is fully mastered, and the sensitivity of the interference source is formed after the function of the element in the circuit is understood and the working state is carefully analyzed.

[0043] The functions of the circuits generated by the different elements in S3 are different, and the circuits with different functions may interfere with each other, mainly the circuits of oscillators or amplifiers, and a shielding design should be carried out during the design of these circuits.

[0044] The shielding design of high-frequency circuits is particularly important during the shielding design process, and the circuits working in high-frequency bands are easily affected by interference signals and can also affect the remaining circuits to some extent. For circuits with different functions and different working frequency bands, mutual shielding processing is implemented to effectively prevent mutual interference problems.

[0045] In S4, electromagnetic compatibility analysis and anti-interference design should be implemented during the circuit wiring process of the radio frequency baseband circuit module. The layout elements can affect the working state of each element in the entire circuit, and one of the main sources of interference is the interaction between elements. The basic principles of wiring design should be noted, that is, a consistent arrangement direction should be ensured during the wiring process, and incorrect soldering problems in the circuit board processing link should be strictly prohibited.

[0046] The ground system of the insensitive signal and large signal circuit in each element includes a small signal amplitude, a low working level, or a signal that is easy to fail, degrade, etc. The main aspects involved are high-power amplifier circuits, high-level circuits, and final amplifiers. The main feature of such circuits is that they have a large working current, and the current is high. They should be separated from the small signal ground system. In addition, the interference source system mainly refers to relays. During the operation of such elements, an impact current will be formed, which will interfere with electronic circuits to different degrees. If not handled in time, the interference degree will be aggravated. During the design of the radio frequency baseband power supply line, the power supply line should have a reasonable width. The width and impedance are inversely proportional. Increasing the width of the power supply line can significantly reduce the impedance and achieve good anti-interference target. During the transmission of data by the power supply line and the ground line, the direction should be strictly ensured to be the same, and the length of the signal line should be appropriate and not too long. The number of vias should be minimized to reduce the connection lines between components. For some incompatible data lines and signal lines, parallel arrangement is prohibited and should be kept away.

[0047] In S5, the deep N-well substrate isolation is constructed by building an N-well around and below the P-well of the device. The N-channel device operates in the P-well, and both the P-well and the deep N-well require taps.

[0048] In S5, the P+ guard ring and the high-resistance substrate isolation ring are created by creating a low-resistance ring in the well or substrate around the device. The guard ring leads multiple contacts, and the metal ring is connected to the N+ ring.

[0049] The scheme greatly reduces the coupling of substrate noise by using the method of deep N-well substrate isolation, P+ protection ring and high resistance substrate isolation ring in the radio frequency circuit module, and achieves good isolation effect. At the same time, the digital power supply and ground of the chip are independent of the radio frequency analog power supply and ground, thereby avoiding the noise coupling crosstalk on the power supply line and ground line.

[0050] The above merely describes the preferred embodiments of the present application; however, the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes according to the technical scheme and the improvement concept of the present application within the technical range disclosed by the present application, and all of them should be covered within the protection scope of the present application.

Claims

1.A method for BeiDou radio frequency baseband integrated noise isolation, characterized in that, It comprises the following steps: S1: change the crosstalk between the receiving signal module and the electromagnetic interference signal in the radio frequency baseband circuit module circuit board, divide the radio frequency circuit module into multiple shielding modules; S2: analyze the working state of each element through multiple shielding modules, and form the sensitivity to the interference source; S3: implement mutual shielding processing for circuits with different functions and different working frequency bands in each element; S4: consistent arrangement direction should be guaranteed during the radio frequency baseband circuit module circuit wiring process, and the welding points should be checked; S5: deep N-well substrate isolation, P+ protection ring and high resistance substrate isolation ring are combined in the radio frequency baseband circuit module; In S1, the radio frequency baseband circuit module needs to transmit and receive data and signals through high frequency channels. Change the crosstalk between the receiving signal module and the electromagnetic interference signal to make it have anti-interference performance. In S1, multiple shielding modules are divided in the radio frequency circuit module. During the division, the actual functional units of the circuit should be strictly followed. The actual performance of each element is fully mastered. After understanding the function of the element in the circuit, carefully analyze its working state and the sensitivity to the interference source. In S2, the electromagnetic compatibility of the radio frequency baseband circuit module printed circuit board should be considered and concerned. On the basis of comprehensive consideration, the electromagnetic compatibility maintains the maximum reduction of electromagnetic signal radiation rate, thereby significantly enhancing the anti-interference performance of the radio frequency baseband circuit module; In S3, the circuits of different elements have different functions, and different circuits may interfere with each other. The main circuits are the oscillator circuit or the amplifier circuit. A shielding design should be carried out during the design of these circuits. In S4, during the radio frequency baseband circuit module circuit wiring process, electromagnetic compatibility analysis and anti-interference design should be implemented. The layout of elements can affect the working state of each element in the entire circuit. One of the main sources of interference is the interaction between elements. The basic principle of wiring design should be paid attention to, that is, a consistent arrangement direction should be guaranteed during the wiring process, and incorrect welding of welding points should be strictly prohibited during the circuit board processing link. In S5, deep N-well substrate isolation is constructed by building an N-well around and below the P-well of the device. N-channel devices operate in P-well. Both P-well and deep N-well need to be tapped. In S5, P+ protection ring and high resistance substrate isolation ring create a low resistance ring in the well or substrate around the device. The protection ring leads multiple contacts, and the metal ring is connected with the N+ ring.

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