Automatic test system for fixed coupling power gain

Abstract

The utility model discloses a fixed coupling power gain automatic test system, and belongs to the technical field of power gain of a power amplifier module. Comprising a preceding-stage module, an output end of a signal source test SG is connected with an input end of the preceding-stage module, an output end of the preceding-stage module is connected with an input end of a coupler, an output port of the coupler is connected with a to-be-detected power amplifier module through a first cable assembly, and an output end of the to-be-detected power amplifier module is connected with an input end of a high-power attenuator through a second cable assembly. The output end of the high-power attenuator is connected with the power meter A. The coupling end of the coupler is connected with the power meter B. According to the utility model, gains of the SG and the first detection point, the second detection point and the third detection point are detected through network distribution, a coupling and attenuator value list of the system is calculated and recorded into power automatic test software, values of the power meter A and the power meter B are automatically measured and calculated, fixed attenuation values are recorded into the values through the measurement and calculation software, and batched last-stage power amplifier modules matched with preceding stages are tested.

Description

Technical Field

[0001] The utility model belongs to the technical field of power gain of power amplifier modules, and particularly relates to a fixed-coupling power gain automatic test system. Background Art

[0002] At present, the common power gain test method is to first use a power meter to collect the output power of the power amplifier module to be tested, and then collect the power signal at the input end of the power amplifier module. The power signal at the input end generally cannot be collected in real time by a power meter, and can only be calculated indirectly to calculate the power gain of the module. The traditional manual test method for power gain needs to first test the maximum output power of the power amplifier module to be tested, and manually record the output signal corresponding to the signal source of the maximum output power. Then move the power meter probe to the output port of the pre-stage module (i.e., the input end of the power amplifier module to be tested), input the signal according to the recorded signal source, drive the pre-stage power amplifier module, record the pre-stage power value, and calculate the maximum output power of the power amplifier module to be tested - the pre-stage power value = power gain value. This manual test method for the power gain of the power amplifier module is only applicable to the test of a single power amplifier module, not only with low efficiency, but also with a cumbersome data recording process. Content of the Utility Model

[0003] Purpose of the utility model: To provide a fixed-coupling power gain automatic test system, which solves the above problems existing in the prior art.

[0004] Technical solution: A fixed-coupling power gain automatic test system includes a pre-stage module. The output end of the signal source test SG is connected to the input end of the pre-stage module. The output end of the pre-stage module is connected to the input end of a coupler. The output port of the coupler is connected to the power amplifier module to be detected through a first cable assembly. The connection between the output end of the first cable assembly and the input end of the power amplifier module to be detected is marked as the first detection point. The output end of the power amplifier module to be detected is connected to the input end of a high-power attenuator through a second cable assembly. The output end of the high-power attenuator is connected to a power meter A. The connection between the output end of the high-power attenuator and the power meter A is marked as the third detection point. The coupling end of the coupler is connected to a power meter B. The connection between the coupling end of the coupler and the power meter B is marked as the second detection point.

[0005] Preferably, it further includes a network analyzer. The port1 cable of the network analyzer is connected to the input end of the second cable assembly, and the port2 cable of the network analyzer is connected to the output end of the high-power attenuator, which is used to test the attenuation value from the first detection point to the third detection point and calibrate.

[0006] Preferably, the port1 cable of the network analyzer is also connected to the input end of the pre-stage module, and the port2 cable of the network analyzer is connected to the output end of the high-power attenuator for testing the gain value between the signal source SG and the third detection point.

[0007] Preferably, the port1 cable of the network analyzer is also connected to the input end of the pre-stage module, and the port2 cable of the network analyzer is also connected to the coupling end of the coupler for testing the gain value between the signal source SG and the second detection point.

[0008] Preferably, the power meter A and the power meter B are composed of two groups of single-channel power meters or one two-channel power meter.

[0009] Preferably, the power meter A and the power meter B are connected to external devices, and the values of the power meter A and the power meter B are automatically measured through the measurement software on the external devices to obtain the difference between the power meter A and the power meter B, and the power gain value of the module to be detected is calculated.

[0010] Beneficial effects: The present utility model relates to a fixed-coupling power gain automatic test system. First, the high-power attenuation values at the first detection point and the third detection point are calibrated by the network analyzer, and then the gain values from the SG signal source to the first detection point and the second detection point are measured by the network analyzer. The difference between the two gain calculations is used as the fixed value list of the coupling attenuation. The fixed value list of the coupling attenuation is synchronously read according to the required test frequency points. The user only needs to input the fixed value list of the coupling attenuation into the test software of the external device to perform the test; the fixed value list of the coupling attenuation does not change with the power amplifier module to be tested, and the power amplifier module to be tested that matches the pre-stage module can be batch-tested;

[0011] The values of the power meter A and the power meter B are automatically measured through the measurement software in the external device, and the fixed attenuation value is input through the measurement software to test the batch of final-stage power amplifier modules that match the pre-stage. Description of the Drawings

[0012] Figure 1 It is a block diagram of the prior art manual test system;

[0013] Figure 2 It is a block diagram of the automatic test system of the present utility model. Detailed Embodiments

[0014] Embodiment 1

[0015] As Figure 2As shown in the figure, the present utility model provides a technical solution, which includes a pre-stage module, a coupler, a power amplifier module to be detected, a power meter A, a power meter B, and a network analyzer. Among them, the power meter A and the power meter B are composed of two groups of single-channel power meters. The input end of the pre-stage module is connected to the output end of the test SG, the output end of the pre-stage module is connected to the input end of the coupler, the output port of the coupler is connected to the power amplifier module to be detected through a first cable assembly, and the connection point between the output end of the first cable assembly and the input end of the power amplifier module to be detected is marked as the first detection point. The output end of the power amplifier module to be detected is connected to the input end of a high-power attenuator through a second cable assembly, the output end of the high-power attenuator is connected to the power meter A, and the connection point between the output end of the high-power attenuator and the power meter A is marked as the third detection point. The coupling end of the coupler is connected to the power meter B, and the connection point between the coupling end of the coupler and the power meter B is marked as the second detection point. The network analyzer is connected to the input end of the power amplifier module to be detected through a first cable assembly, and the network analyzer is connected to the output end of the power amplifier module to be detected through a second cable assembly. The attenuation values of the first detection point, the second detection point, and the third detection point are calibrated by the coupler in cooperation with the network analyzer. The power meter A and the power meter B are connected to external devices, and the values of the power meter A and the power meter B and the power gain value of the module to be detected are automatically calculated through the calculation software on the external devices.

[0016] Specific embodiments are as follows Figure 2 As shown in the figure, in this embodiment, four groups of power amplifier modules to be detected are used, namely power amplifier module DUT1, power amplifier module DUT2, power amplifier module DUT3, and power amplifier module DUT4. The input end of the power amplifier module DUT1 is connected to the output end of the coupler through a first cable assembly, and the output end of the power amplifier module DUT1 is connected to the input end of the high-power attenuator through a second cable assembly. The coupler cooperates with the high-power attenuator, and the coupling attenuation value of the coupler is directly input into the calculation software in the external device. After the detection of the power amplifier module DUT1 is completed, the power amplifier module DUT1 is replaced with the power amplifier module DUT2, and the power amplifier module DUT2 is detected. In this way, the detection of the power amplifier module DUT3 and the power amplifier module DUT4 can be realized in sequence, and the power gain measurement of the power amplifier module can be quickly realized in batch automatically.

[0017] Embodiment 2

[0018] In this embodiment, the power meter A and the power meter B are composed of a single two-channel power meter, and the other electrical components and connection relationships are the same as those in Embodiment 1.

[0019] Through the above technical solution, the present utility model can achieve the following working process:

[0020] The cable of port1 of the network analyzer passes through the input end of the second cable assembly. The output end of the second cable assembly is connected to the input end of the high-power attenuator. The output end of the high-power attenuator is connected to the cable of port2 of the network analyzer. The loss of the high-power attenuator is calculated by the network analyzer, that is, the attenuation values at the first detection point, the second detection point, and the third detection point are tested, and zero calibration is performed.

[0021] The cable of port1 of the network analyzer is connected to the input port of the pre-stage module. The output port of the pre-stage module is connected to the input port of the coupler. The coupled port of the coupler is connected to the load terminal.

[0022] The coupled port of the coupler is connected to the first cable assembly. The second cable assembly is connected to the input port of the high-power attenuator. The output port of the high-power attenuator is connected to the cable of port2 of the network analyzer. The network analyzer starts to perform gain detection, and obtains the gain of the pre-stage module through the insertion loss channel of the coupler, that is, the gain value between SG and the third detection point, which is denoted as G1.

[0023] The cable of port1 of the network analyzer is connected to the input port of the pre-stage module. The output port of the pre-stage module is connected to the input port of the coupler. The coupled port of the coupler is connected to the cable of port2. The coupled port of the coupler is connected to the load terminal. The network analyzer starts to perform gain detection, and obtains the gain of the pre-stage module through the coupled end of the coupler, that is, the gain value from SG to the second detection point, which is denoted as G2.

[0024] The software calculates the coupling attenuation value: G1 - G2. For the fixed pre-stage module and the coupling link, the coupling attenuation value is the same. The fixed attenuation value can be calculated by the software. When testing a batch of final power amplifier modules matched with the pre-stage, the detection data of the gain value between the third detection points, the gain value at the second detection point, and the coupling attenuation value are listed in Table 1.

[0025] Table 1: Detection data of the gain value between the third detection points, the gain value at the second detection point, and the coupling attenuation value

[0026]

[0027] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A fixed-coupling power gain automatic test system, characterized in that, It includes a pre-stage module. The output end of the signal source test SG is connected to the input end of the pre-stage module. The output end of the pre-stage module is connected to the input end of the coupler. The output port of the coupler is connected to the power amplifier module to be detected through a first cable assembly. The connection point between the output end of the first cable assembly and the input end of the power amplifier module to be detected is marked as the first detection point. The output end of the power amplifier module to be detected is connected to the input end of the high-power attenuator through a second cable assembly. The output end of the high-power attenuator is connected to power meter A. The connection point between the output end of the high-power attenuator and power meter A is marked as the third detection point. The coupled end of the coupler is connected to power meter B. The connection point between the coupled end of the coupler and power meter B is marked as the second detection point.

2. The automatic test system for fixed-coupling power gain according to claim 1, characterized in that It further includes a network analyzer. The port1 cable of the network analyzer is connected to the input end of the second cable assembly. The port2 cable of the network analyzer is connected to the output end of the high-power attenuator, which is used to test the attenuation value from the first detection point to the third detection point and calibrate.

3. The automatic test system for fixed-coupling power gain according to claim 2, characterized in that, The port1 cable of the network analyzer is also connected to the input end of the pre-stage module. The port2 cable of the network analyzer is connected to the output end of the high-power attenuator, which is used to test the gain value between the signal source test SG and the third detection point.

4. The automatic test system for fixed-coupling power gain according to claim 2, characterized in that, The port1 cable of the network analyzer is also connected to the input end of the pre-stage module. The port2 cable of the network analyzer is also connected to the coupled end of the coupler, which is used to test the gain value between the signal source test SG and the second detection point.

5. The automatic test system for fixed coupling power gain according to claim 1, characterized in that, The power meter A and power meter B are composed of two groups of single-channel power meters or one dual-channel power meter.

6. The automatic test system for fixed-coupling power gain according to claim 1, wherein The power meter A and power meter B are connected to an external device. The values of the power meter A and power meter B are automatically measured through the measurement software on the external device to obtain the difference between the power meter A and power meter B, and calculate the power gain value of the module to be detected.

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