Radio frequency spurious debugging circuit

Abstract

The utility model relates to the technical field of debugging circuits, in particular to a radio frequency spurious debugging circuit, which comprises a main circuit and a checking circuit with the same structure as the main circuit, specifically, the checking circuit comprises a filter, filtering modules are symmetrically arranged on two sides of the filter, an inductor L9 and an inductor L10 are arranged between the two checking circuits, and the inductor L9 and the inductor L10 are connected with the main circuit. When an interference problem occurs, the main circuit takes an inductor L9 or an inductor L10 as a path modification node and is combined with the troubleshooting circuit to form a debugging circuit with the same structure as the main circuit. According to the utility model, through the design of the main circuit and the troubleshooting circuit and the change of a hardware channel, an interference source and an interference path of the frequency band are troubleshot, the stray problem caused by the channel can be rapidly troubleshot, and meanwhile, a compatible position can be disconnected, so that the cost and the performance are optimal, and the efficiency and the accuracy of circuit harmonic interference troubleshooting are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of debugging circuit, especially relates to a radio frequency stray debugging circuit. BACKGROUND

[0002] With the development of cellular communication technology, cellular communication modules are more and more miniaturized, and more functions can be realized through compatible design of the modules, and the modules are more and more complicated with other functional modules, resulting in some stray risks of the cellular modules in the performance verification process, including some interference of the circuit itself and interference of multiple harmonics.

[0003] However, electromagnetic interference is in a relatively complex electromagnetic environment, and the traditional radio frequency stray debugging circuit has the problem of stray interference of the cellular module, resulting in a relatively complex process of circuit harmonic interference troubleshooting. UTILITY MODEL CONTENT

[0004] The utility model provides the following technical scheme in view of the deficiency of prior art.

[0005] A radio frequency stray debugging circuit, comprising: a main circuit and an investigation circuit identical in structure with the main circuit.

[0006] Specifically, the investigation circuit comprises a filter, and filter modules are symmetrically arranged on both sides of the filter, and inductors L9 and L10 are arranged between the two investigation circuits, and when interference occurs, the main circuit is combined with the investigation circuit to form an investigation and debugging circuit by taking the inductor L9 or the inductor L10 as a path modification node.

[0007] As an improvement of the above technical scheme, the filter module comprises at least two inductors and a capacitor electrically connected between the two inductors.

[0008] As an improvement of the above technical scheme, one of the filter modules of the main circuit comprises an inductor L1, an inductor L2 and a capacitor C1 arranged between the inductor L1 and the inductor L2, the other filter module comprises an inductor L3, an inductor L4 and a capacitor C2 arranged between the inductor L3 and the inductor L4, one of the filter modules of the investigation circuit comprises an inductor L5, an inductor L6 and a capacitor C3 arranged between the inductor L5 and the inductor L6, the other filter module comprises an inductor L7, an inductor L8 and a capacitor C4 arranged between the inductor L7 and the inductor L8, one side of the inductor L1 and the inductor L5 is electrically connected with a power amplifier, and one side of the inductor L4 and the inductor L8 is electrically connected with a switch.

[0009] As the improvement of the above technical scheme, one end of the inductor L9 is electrically connected between the inductor L1 and the capacitor C1, one end of the inductor L9 is electrically connected between the inductor L5 and the capacitor C3, one end of the inductor L10 is electrically connected between the inductor L3 and the capacitor C2, and one end of the inductor L10 is electrically connected between the inductor L7 and the capacitor C4.

[0010] The utility model discloses the beneficial effect: through the design of main circuit and troubleshooting circuit, can conveniently troubleshoot whole main circuit, through the modification of hardware passway, change one frequency band to other hardware passway, through the change of hardware passway, the interference source and interference path of this frequency band are inquired, can quickly inquire the stray problem caused by passway itself, make hardware design only need increase a few compatible matching can realize quick troubleshooting test, compatible position can also disconnect processing simultaneously, make cost and performance optimal, improve the efficiency and accuracy of circuit harmonic interference troubleshooting. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the framework structure diagram of radio frequency function in prior art;

[0012] Figure 2 It is the circuit structure diagram of the utility model;

[0013] Figure 3 It is the structure diagram of first test passway in the utility model;

[0014] Figure 4 It is the structure diagram of second test passway in the utility model;

[0015] Figure 5 It is the structure diagram of third test passway in the utility model. DETAILED DESCRIPTION

[0016] The embodiment of the utility model will be explained below through specific concrete example, and the person skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification.The utility model can also be implemented or applied through another different specific embodiment, and each item of detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model.

[0017] Please refer to Figures 1 to 5 , provide a kind of radio frequency stray debugging circuit, comprising: main circuit and the same structure of troubleshooting circuit with main circuit.

[0018] Specifically, the troubleshooting circuit comprises a filter, filter modules are symmetrically arranged on both sides of the filter, and inductors L9 and L10 are arranged between the two troubleshooting circuits. When an interference problem occurs, the main circuit is combined with the troubleshooting circuit to form a troubleshooting debugging circuit by taking the inductor L9 or the inductor L10 as a path modification node.

[0019] The inductors L9 and L10 are taken as switching nodes to adjust the path condition of the circuit. When an interference problem occurs, the signal output by the power amplifier can change the output direction from the position of the inductor L9 or the inductor L10, so that the function of troubleshooting the interference position when the interference occurs can be realized.

[0020] In one embodiment, the filter module comprises at least two inductors and a capacitor electrically connected between the two inductors.

[0021] The LC low-pass filter function is formed by cooperation between the inductor and the capacitor, further strengthening the filtering function of the circuit, and for further detailed description of the content of the above scheme, please refer to Figure 2 Among them, one of the filter modules of the main circuit comprises inductors L1, L2 and a capacitor C1 arranged between the inductors L1 and L2, the other filter module comprises inductors L3, L4 and a capacitor C2 arranged between the inductors L3 and L4, one of the filter modules of the troubleshooting circuit comprises inductors L5, L6 and a capacitor C3 arranged between the inductors L5 and L6, the other filter module comprises inductors L7, L8 and a capacitor C4 arranged between the inductors L7 and L8, one side of the inductor L1 and the inductor L5 is electrically connected with the power amplifier, and one side of the inductor L4 and the inductor L8 is electrically connected with the switch.

[0022] Figure 2 TX in the above formula represents the output node of the signal, in addition to the implementation of the filter module, the access positions of the inductor L9 and the inductor L10 also need to be determined, specifically, please refer to Figure 2 One end of the inductor L9 is electrically connected between the inductor L1 and the capacitor C1, one end of the inductor L9 is electrically connected between the inductor L5 and the capacitor C3, one end of the inductor L10 is electrically connected between the inductor L3 and the capacitor C2, and one end of the inductor L10 is electrically connected between the inductor L7 and the capacitor C4.

[0023] When the problem of stray or other interference occurs, in order to determine the stray path, a segmented troubleshooting method can be used. The normal frequency band communication path is: L1-C1-L2-L3-C2-L4, if the path test stray has a problem, the path can be modified to let the signal not pass through the capacitor C2, but output from the inductor L10 to the corresponding position of the troubleshooting circuit, at this time the communication path is: L1-C1-L2-L3-L10-C4-L8, as shown in Figure 3 The required switch port configuration can be configured synchronously by software.

[0024] If there is a problem after modifying the path according to the above method, L3-C2-L4 needs to be checked. If the test is normal, the inductor L9 is used as a switching node, and the communication path is modified to L1-L9-C3-L6-L7-C4-L8, as shown in Figure 4 The required switch port configuration can be configured synchronously by software, so as to exclude the problem of C1-L2-L3 path. If there is no problem after modification, the entire path L1-C1-L2-L3-C2-L4 can be replaced by L5-C3-L6-L7-C4-L8, at this time the power amplifier and the port of the switch need to be configured by software and tested. The structure is as shown in Figure 5

[0025] By using the structure described in the embodiment, the stray problem caused by the path itself can be quickly checked by modifying the hardware path. The overall scheme can make the cost and performance optimal.

[0026] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical idea of the present application should be covered by the claims of the present application.​

Claims

1. A radio frequency spurious debugging circuit, characterized by, The utility model relates to a kind of debugging circuit for power amplifier, including: Main circuit; The same structure as main circuit is arranged in the troubleshooting circuit, and the troubleshooting circuit includes filter, and filter module is symmetrically arranged on the two sides of filter; Two described troubleshooting circuits are provided with inductance L9 and inductance L10 between them; When interference problem occurs, main circuit is inductance L9 or inductance L10 as passageway modification node and troubleshooting circuit combination forms troubleshooting debugging circuit.

2. The RF spurious tuning circuit of claim 1, wherein: The filter module includes at least two inductors and a capacitor electrically connected between the two inductors.

3. A radio frequency spurious tuning circuit as claimed in claim 2, characterised in that: One of the filter modules of the main circuit includes inductance L1, inductance L2 and capacitor C1 arranged between inductance L1 and inductance L2, and the other filter module includes inductance L3, inductance L4 and capacitor C2 arranged between inductance L3 and inductance L4. One of the filter modules of the troubleshooting circuit includes inductance L5, inductance L6 and capacitor C3 arranged between inductance L5 and inductance L6, and the other filter module includes inductance L7, inductance L8 and capacitor C4 arranged between inductance L7 and inductance L8. One side of the inductance L1 and the inductance L5 is electrically connected to the power amplifier, and one side of the inductance L4 and the inductance L8 is electrically connected to the switch.

4. A radio frequency spurious signal cancellation circuit as claimed in claim 3, characterized in that: One end of the inductance L9 is electrically connected between the inductance L1 and the capacitor C1, and one end of the inductance L9 is electrically connected between the inductance L5 and the capacitor C3. One end of the inductance L10 is electrically connected between the inductance L3 and the capacitor C2, and one end of the inductance L10 is electrically connected between the inductance L7 and the capacitor C4.

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