CN105785206B - A kind of the passband test macro and its method of multichannel frequency converter - Google Patents
A kind of the passband test macro and its method of multichannel frequency converter Download PDFInfo
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Abstract
本发明公开了一种多通道变频器的通频带测试系统及其方法，该测试系统包括基准时钟相同的本振信号发生装置、可调信号发生装置和信号功率频率检测装置；所述本振信号发生装置输出本振信号至多通道变频器，用于为多通道变频器提供本振信号，经信号功率频率检测装置检测后获取本振信号的频率和功率值；所述可调信号发生装置产生频率可动态调节的信号并输出至多通道变频器，当信号功率频率检测装置检测到的多通道变频器的输出信号的功率在预设功率阈值范围内，测试得到多通道变频器的通频带；所述可调信号发生装置产生的信号以本振信号的频率为中心频率。
The invention discloses a passband test system and method for a multi-channel frequency converter. The test system includes a local oscillator signal generator with the same reference clock, an adjustable signal generator, and a signal power frequency detection device; the local oscillator signal The generating device outputs the local oscillator signal to the multi-channel frequency converter, which is used to provide the local oscillator signal for the multi-channel frequency converter, and obtains the frequency and power value of the local oscillator signal after being detected by the signal power frequency detection device; the adjustable signal generating device generates a frequency The dynamically adjustable signal is output to the multi-channel inverter. When the power of the output signal of the multi-channel inverter detected by the signal power frequency detection device is within the preset power threshold range, the passband of the multi-channel inverter is obtained by testing; The signal generated by the adjustable signal generating device takes the frequency of the local oscillator signal as the center frequency.
Description
技术领域technical field
本发明属于电子设备测试领域，尤其涉及一种多通道变频器的通频带测试系统及其方法。The invention belongs to the field of electronic equipment testing, and in particular relates to a passband testing system of a multi-channel frequency converter and a method thereof.
背景技术Background technique
目前针对射频微波频段的多通道变频器通频带的测试，一般采用矢量网络分析仪进行测试，如图1所示。多端口矢量网络分析仪提供激励信号和本振信号，同时接收多通道变频器的输出信号。在测试之前，需要根据被测的多通道变频器的性能指标来设置矢量网络分析仪的工作频率范围、输出功率大小以及扫描点数等，然后再使用校准件对每个通道进行校准。校准完成后，被测件的激励输入端口与矢量网络分析仪源端口、输出端口与矢量网络分析仪接收机端口、本振输入端口与矢量网络分析仪的另一源端口进行连接。变频模块的输出信号与输入的激励信号之比即为传输响应，按照上述介绍的方法，在一定的频率范围内通过对传输响应曲线进行数据处理即可得到带宽等指标。At present, a vector network analyzer is generally used to test the passband of a multi-channel inverter in the radio frequency microwave frequency band, as shown in Figure 1. The multi-port vector network analyzer provides excitation signals and local oscillator signals, and simultaneously receives the output signals of multi-channel frequency converters. Before the test, it is necessary to set the operating frequency range, output power, and number of scan points of the vector network analyzer according to the performance index of the multi-channel inverter to be tested, and then use the calibration parts to calibrate each channel. After the calibration is completed, the excitation input port of the DUT is connected to the source port of the vector network analyzer, the output port is connected to the receiver port of the vector network analyzer, and the input port of the local oscillator is connected to another source port of the vector network analyzer. The ratio of the output signal of the frequency conversion module to the input excitation signal is the transmission response. According to the method introduced above, the bandwidth and other indicators can be obtained by processing the transmission response curve within a certain frequency range.
但是现有的采用矢量网络分析仪进行测试，每次测试都需要进行复杂的校准，校准过程繁琐且时间比较长。同时，矢量网络分析仪价格昂贵，而且还要选配频偏或者混频器测试选件才能进行测试，使用成本很高。However, in the existing test using a vector network analyzer, complex calibration is required for each test, and the calibration process is cumbersome and takes a long time. At the same time, the vector network analyzer is expensive, and it needs to be equipped with frequency deviation or mixer test options for testing, and the cost of use is very high.
发明内容Contents of the invention
为了解决现有技术的缺点，本发明提供一种多通道变频器的通频带测试系统及其方法。其中，本发明的该测试系统采用常用测试仪器，降低了测试成本低且测试准确；该方法采用频率步进动态调节和频率步进方向自动调整技术，能够提高测试速度，还能保证测试精度。In order to solve the shortcomings of the prior art, the present invention provides a passband test system and method for a multi-channel frequency converter. Wherein, the test system of the present invention adopts common test instruments, which reduces test cost and is accurate; the method adopts frequency step dynamic adjustment and frequency step direction automatic adjustment technology, which can improve test speed and ensure test accuracy.
为实现上述目的，本发明采用以下技术方案：To achieve the above object, the present invention adopts the following technical solutions:
一种多通道变频器的通频带测试系统，包括基准时钟相同的本振信号发生装置、可调信号发生装置和信号功率频率检测装置；A passband test system of a multi-channel frequency converter, including a local oscillator signal generator with the same reference clock, an adjustable signal generator, and a signal power frequency detection device;
所述本振信号发生装置输出本振信号至多通道变频器，用于为多通道变频器提供本振信号，经信号功率频率检测装置检测后获取本振信号的频率和功率值；The local oscillator signal generating device outputs the local oscillator signal to the multi-channel frequency converter, which is used to provide the local oscillator signal for the multi-channel frequency converter, and obtains the frequency and power value of the local oscillator signal after being detected by the signal power frequency detection device;
所述可调信号发生装置产生频率可动态调节的信号并输出至多通道变频器，当信号功率频率检测装置检测到的多通道变频器的输出信号的功率在预设功率阈值范围内，测试得到多通道变频器的通频带；所述可调信号发生装置产生的信号以本振信号的频率为中心频率。The adjustable signal generating device generates a signal whose frequency can be dynamically adjusted and outputs it to the multi-channel frequency converter. When the power of the output signal of the multi-channel frequency converter detected by the signal power frequency detection device is within the preset power threshold range, the multi-channel frequency converter is tested. The passband of the channel frequency converter; the signal generated by the adjustable signal generating device takes the frequency of the local oscillator signal as the center frequency.
所述预设功率阈值范围为本振信号功率值-3dBm±预设误差功率值。这样能够确定测试精度设定要求，使得在截止频率查找过程中，对相邻频率点的测试信号功率大小进行自动比较，从而能自动调整频率步进方向。The preset power threshold range is -3dBm±the preset error power value of the local oscillator signal power value. In this way, the test accuracy setting requirements can be determined, so that during the cut-off frequency search process, the test signal power at adjacent frequency points can be automatically compared, so that the frequency step direction can be automatically adjusted.
所述可调信号发生装置产生的信号以预设频率等值间隔进行动态调节。这样本发明的该测试系统能够根据测试精度设定要求，自动调节频率步进，这可以有效提高测试速度。The signal generated by the adjustable signal generating device is dynamically adjusted at intervals of preset frequency equivalence. In this way, the test system of the present invention can automatically adjust the frequency step according to the test accuracy setting requirements, which can effectively improve the test speed.
所述信号功率频率检测装置为频谱分析仪。本发明可采用频谱分析仪这样的常用测试仪器，测试成本低。The signal power frequency detection device is a spectrum analyzer. The present invention can adopt common testing instruments such as spectrum analyzers, and the testing cost is low.
一种基于多通道变频器的通频带测试系统的测试方法，包括：A test method for a passband test system based on a multi-channel frequency converter, comprising:
步骤(1)：调整本振信号发生装置、可调信号发生装置和信号功率频率检测装置的基准时钟均相同；Step (1): Adjust the reference clocks of the local oscillator signal generator, the adjustable signal generator and the signal power frequency detection device to be the same;
步骤(2)：采用信号功率频率检测装置进行检测输入至多通道变频器的本振信号的频率和功率值；在信号功率频率检测装置中，预设功率阈值范围；Step (2): Using a signal power frequency detection device to detect the frequency and power value of the local oscillator signal input to the multi-channel frequency converter; in the signal power frequency detection device, a power threshold range is preset;
步骤(3)：可调信号发生装置产生频率可动态调节的信号并输出至多通道变频器，当信号功率频率检测装置检测到的多通道变频器的输出信号的功率在预设功率阈值范围内，测试得到多通道变频器的通频带。Step (3): The adjustable signal generating device generates a signal whose frequency can be dynamically adjusted and outputs it to the multi-channel inverter. When the power of the output signal of the multi-channel inverter detected by the signal power frequency detection device is within the preset power threshold range, Test to get the passband of the multi-channel inverter.
所述步骤(2)中，预设功率阈值范围为本振信号功率值-3dBm±预设误差功率值。In the step (2), the preset power threshold range is -3dBm±the preset error power value of the local oscillator signal power value.
所述步骤(3)中，以预设频率等值间隔逐步增加可调信号发生装置输入至多通道变频器的信号频率，当信号功率频率检测装置检测多通道变频器输出信号的功率在预设功率阈值范围内，得到多通道变频器的上限截止频率。In the step (3), the signal frequency input to the multi-channel frequency converter by the adjustable signal generating device is gradually increased at preset frequency equivalent intervals. When the signal power frequency detection device detects that the power of the output signal of the multi-channel frequency converter is within the preset power Within the threshold range, the upper limit cut-off frequency of the multi-channel inverter is obtained.
所述步骤(3)中，以预设频率等值间隔逐步减小可调信号发生装置输入至多通道变频器的信号频率，当信号功率频率检测装置检测多通道变频器输出信号的功率在预设功率阈值范围内，得到多通道变频器的下限截止频率。In the step (3), the frequency of the signal input from the adjustable signal generating device to the multi-channel frequency converter is gradually reduced at preset frequency equivalent intervals. When the signal power frequency detection device detects that the power of the output signal of the multi-channel frequency converter is within the preset In the power threshold range, the lower limit cut-off frequency of the multi-channel inverter is obtained.
在测试多通道变频器的上限截止频率的过程中，保持可调信号发生装置的输出信号的功率值，对可调信号发生装置的输出信号的频率值进行调节，直到信号功率频率检测装置测试的多通道变频器输出信号的功率在本振信号功率值-3dBm±预设误差功率值范围内，得到多通道变频器通频带的上限截止频率。In the process of testing the upper limit cut-off frequency of the multi-channel inverter, the power value of the output signal of the adjustable signal generating device is maintained, and the frequency value of the output signal of the adjustable signal generating device is adjusted until the signal power frequency detection device is tested. The power of the output signal of the multi-channel frequency converter is within the range of -3dBm ± preset error power value of the local oscillator signal power value, and the upper limit cut-off frequency of the pass frequency band of the multi-channel frequency converter is obtained.
在测试多通道变频器的下限截止频率的过程中，保持可调信号发生装置的输出信号的功率值，对可调信号发生装置的输出信号的频率值进行调节，直到信号功率频率检测装置测试的多通道变频器输出信号的功率在本振信号功率值-3dBm±预设误差功率值范围内，得到多通道变频器通频带的下限截止频率。In the process of testing the lower limit cut-off frequency of the multi-channel inverter, the power value of the output signal of the adjustable signal generating device is maintained, and the frequency value of the output signal of the adjustable signal generating device is adjusted until the signal power frequency detection device is tested. The power of the output signal of the multi-channel frequency converter is within the range of -3dBm ± preset error power value of the local oscillator signal power value, and the lower limit cut-off frequency of the pass frequency band of the multi-channel frequency converter is obtained.
本发明的有益效果为：The beneficial effects of the present invention are:
(1)本发明的该测试系统采用了基准时钟相同的本振信号发生装置、可调信号发生装置和信号功率频率检测装置进行测试多通道变频器的通频带，保证了频率步进一致，提高了测试速度，还能保证测试精度；使得本发明采用常用测试仪器，降低了测试成本低；(1) This test system of the present invention has adopted the same local oscillator signal generating device, adjustable signal generating device and signal power frequency detecting device of the reference clock to test the passband of the multi-channel frequency converter, which has ensured that the frequency step is consistent and improves The test speed is improved, and the test accuracy can also be guaranteed; the present invention adopts common test instruments, which reduces the test cost;
(2)本发明的该测试方法在截止频率查找过程中，对相邻频率点的测试信号功率大小进行自动比较，从而能自动调整频率步进方向；该方法根据通频带截止频率处的功率设定值，先按照大频率步进查找到截止频率范围，在此截止频率范围内再进行小频率步进查找；同时根据测试精度设定要求，能自动调节频率步进，这可以有效提高测试速度；测试过程中操作简单，无需人工校准，可以实现自动测试；(2) This test method of the present invention compares the test signal power size of adjacent frequency points automatically in the cut-off frequency search process, thereby can automatically adjust the frequency stepping direction; Fixed value, first find the cut-off frequency range according to the large frequency step, and then search for the small frequency step within this cut-off frequency range; at the same time, according to the test accuracy setting requirements, the frequency step can be automatically adjusted, which can effectively improve the test speed ;The operation is simple during the test process, no manual calibration is required, and automatic test can be realized;
附图说明Description of drawings
图1是传统的多通道变频器通频带测试结构示意图；Figure 1 is a schematic diagram of the traditional multi-channel inverter passband test structure;
图2是本发明的多通道变频器通频带测试结构示意图。Fig. 2 is a schematic diagram of the passband test structure of the multi-channel frequency converter of the present invention.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
无论是采用何种测试仪器进行测试，多通道变频器通频带的测试实现思路基本上是相同的。在保持输入信号功率不变的情况下，以中心频率为基准点，先测试中心频点对应的输出信号功率，再通过逐步减小输入信号的频率，当输出信号功率下降到中心频点输出信号功率的0.707倍，即输出信号减小3dB时，就得到了下限截止频率fL；再逐步增大输入信号的频率，当输出信号功率下降到中心频点输出信号功率的0.707倍，即输出信号减小3dB时，得到上限截止频率fH，从而得到多通道变频器通频带BW，即BW＝fH-fL。No matter what kind of test equipment is used for testing, the realization of the test of the passband of the multi-channel frequency converter is basically the same. In the case of keeping the input signal power unchanged, take the center frequency as the reference point, first test the output signal power corresponding to the center frequency point, and then gradually reduce the frequency of the input signal, when the output signal power drops to the center frequency point output signal 0.707 times the power, that is, when the output signal is reduced by 3dB, the lower limit cut-off frequency f L is obtained; then gradually increase the frequency of the input signal, when the output signal power drops to 0.707 times the output signal power at the center frequency point, that is, the output signal When it is reduced by 3dB, the upper limit cut-off frequency f H is obtained, thereby obtaining the passband BW of the multi-channel frequency converter, that is, BW=f H -f L .
本发明提供了一种新的多通道变频器通频带测试方法，用于在没有矢量网络分析仪前提下，采用通用测试仪器实现多通道变频器通频带的自动测试，如图2所示，基本思路就是采用动态频率步进方法来实现快速、准确测试。The present invention provides a new method for testing the passband of a multi-channel frequency converter, which is used for automatic testing of the passband of a multi-channel frequency converter by using a general testing instrument without a vector network analyzer, as shown in Figure 2, basically The idea is to use the dynamic frequency stepping method to achieve fast and accurate testing.
本发明的多通道变频器的通频带测试系统，包括基准时钟相同的本振信号发生装置、可调信号发生装置和信号功率频率检测装置；The pass-band test system of the multi-channel frequency converter of the present invention includes a local oscillator signal generator, an adjustable signal generator and a signal power frequency detection device with the same reference clock;
所述本振信号发生装置输出本振信号至多通道变频器，用于为多通道变频器提供本振信号，经信号功率频率检测装置检测后获取本振信号的频率和功率值；The local oscillator signal generating device outputs the local oscillator signal to the multi-channel frequency converter, which is used to provide the local oscillator signal for the multi-channel frequency converter, and obtains the frequency and power value of the local oscillator signal after being detected by the signal power frequency detection device;
可调信号发生装置产生频率可动态调节的信号并输出至多通道变频器，当信号功率频率检测装置检测到的多通道变频器的输出信号的功率在预设功率阈值范围内，测试得到多通道变频器的通频带；所述可调信号发生装置产生的信号以本振信号的频率为中心频率。The adjustable signal generating device generates a signal whose frequency can be dynamically adjusted and outputs it to the multi-channel frequency converter. When the power of the output signal of the multi-channel frequency converter detected by the signal power frequency detection device is within the preset power threshold range, the multi-channel frequency conversion is tested. The passband of the device; the signal generated by the adjustable signal generating device takes the frequency of the local oscillator signal as the center frequency.
其中，预设功率阈值范围为本振信号功率值-3dBm±预设误差功率值。这样能够确定测试精度设定要求，使得在截止频率查找过程中，对相邻频率点的测试信号功率大小进行自动比较，从而能自动调整频率步进方向。Wherein, the preset power threshold range is -3dBm±the preset error power value of the local oscillator signal power value. In this way, the test accuracy setting requirements can be determined, so that during the cut-off frequency search process, the test signal power at adjacent frequency points can be automatically compared, so that the frequency step direction can be automatically adjusted.
可调信号发生装置产生的信号以预设频率等值间隔进行动态调节。这样本发明的该测试系统能够根据测试精度设定要求，自动调节频率步进，这可以有效提高测试速度。The signal generated by the adjustable signal generating device is dynamically adjusted at intervals of preset frequency equivalence. In this way, the test system of the present invention can automatically adjust the frequency step according to the test accuracy setting requirements, which can effectively improve the test speed.
信号功率频率检测装置为频谱分析仪。本发明可采用频谱分析仪这样的常用测试仪器，测试成本低。The signal power frequency detection device is a spectrum analyzer. The present invention can adopt common testing instruments such as spectrum analyzers, and the testing cost is low.
基于本发明的多通道变频器的通频带测试系统的测试方法，包括以下三个步骤：The test method based on the passband test system of the multi-channel frequency converter of the present invention comprises the following three steps:
步骤(1)：调整本振信号发生装置、可调信号发生装置和信号功率频率检测装置的基准时钟均相同；Step (1): Adjust the reference clocks of the local oscillator signal generator, the adjustable signal generator and the signal power frequency detection device to be the same;
步骤(2)：采用信号功率频率检测装置进行检测输入至多通道变频器的本振信号的频率和功率值；在信号功率频率检测装置中，预设功率阈值范围；Step (2): Using a signal power frequency detection device to detect the frequency and power value of the local oscillator signal input to the multi-channel frequency converter; in the signal power frequency detection device, a power threshold range is preset;
步骤(3)：可调信号发生装置产生频率可动态调节的信号并输出至多通道变频器，当信号功率频率检测装置检测到的多通道变频器的输出信号的功率在预设功率阈值范围内，测试得到多通道变频器的通频带。Step (3): The adjustable signal generating device generates a signal whose frequency can be dynamically adjusted and outputs it to the multi-channel inverter. When the power of the output signal of the multi-channel inverter detected by the signal power frequency detection device is within the preset power threshold range, Test to get the passband of the multi-channel inverter.
其中，步骤(2)中，预设功率阈值范围为本振信号功率值-3dBm±预设误差功率值。Wherein, in step (2), the preset power threshold range is -3dBm±the preset error power value of the local oscillator signal power value.
步骤(3)中，以预设频率等值间隔逐步增加可调信号发生装置输入至多通道变频器的信号频率，当信号功率频率检测装置检测多通道变频器输出信号的功率在预设功率阈值范围内，得到多通道变频器的上限截止频率。In step (3), the signal frequency input to the multi-channel inverter by the adjustable signal generating device is gradually increased at preset frequency equivalent intervals, when the signal power frequency detection device detects that the power of the output signal of the multi-channel inverter is within the preset power threshold range , get the upper limit cut-off frequency of the multi-channel inverter.
步骤(3)中，以预设频率等值间隔逐步减小可调信号发生装置输入至多通道变频器的信号频率，当信号功率频率检测装置检测多通道变频器输出信号的功率在预设功率阈值范围内，得到多通道变频器的下限截止频率。In step (3), the frequency of the signal input from the adjustable signal generating device to the multi-channel frequency converter is gradually reduced at preset frequency equivalent intervals, when the signal power frequency detection device detects that the power of the output signal of the multi-channel frequency converter is within the preset power threshold Within the range, the lower limit cut-off frequency of the multi-channel inverter is obtained.
在测试多通道变频器的上限截止频率的过程中，保持可调信号发生装置的输出信号的功率值，对可调信号发生装置的输出信号的频率值进行调节，直到信号功率频率检测装置测试的多通道变频器输出信号的功率在本振信号功率值-3dBm±预设误差功率值范围内，得到多通道变频器通频带的上限截止频率。In the process of testing the upper limit cut-off frequency of the multi-channel inverter, the power value of the output signal of the adjustable signal generating device is maintained, and the frequency value of the output signal of the adjustable signal generating device is adjusted until the signal power frequency detection device is tested. The power of the output signal of the multi-channel frequency converter is within the range of -3dBm ± preset error power value of the local oscillator signal power value, and the upper limit cut-off frequency of the pass frequency band of the multi-channel frequency converter is obtained.
在测试多通道变频器的下限截止频率的过程中，保持可调信号发生装置的输出信号的功率值，对可调信号发生装置的输出信号的频率值进行调节，直到信号功率频率检测装置测试的多通道变频器输出信号的功率在本振信号功率值-3dBm±预设误差功率值范围内，得到多通道变频器通频带的下限截止频率。In the process of testing the lower limit cut-off frequency of the multi-channel inverter, the power value of the output signal of the adjustable signal generating device is maintained, and the frequency value of the output signal of the adjustable signal generating device is adjusted until the signal power frequency detection device is tested. The power of the output signal of the multi-channel frequency converter is within the range of -3dBm ± preset error power value of the local oscillator signal power value, and the lower limit cut-off frequency of the pass frequency band of the multi-channel frequency converter is obtained.
在本发明的一个实施例中，本振信号发生装置和可调信号发生装置采用信号发生器来实现，信号功率频率检测装置以频谱分析仪来实现。In one embodiment of the present invention, the local oscillator signal generating device and the adjustable signal generating device are realized by a signal generator, and the signal power frequency detection device is realized by a spectrum analyzer.
具体地，在测试之前，先将两台信号发生器和频谱分析仪进行共时基，共用一个10MHz的基准时钟，这样可以使三台测试仪器的频率步进一致，设置截止频率处的功率为(P0-3±0.01dBm)。Specifically, before the test, the two signal generators and the spectrum analyzer are time-base together and share a 10MHz reference clock, so that the frequency steps of the three test instruments can be consistent, and the power at the cut-off frequency is set to (P 0 -3±0.01dBm).
采用信号功率频率检测装置进行检测输入至多通道变频器的本振信号的频率和功率值；其中，本振信号的频率作为可调信号发生装置输出信号的中心频率，使用频谱分析仪测试中心频率点输出信号的大小，记为P0。Use the signal power frequency detection device to detect the frequency and power value of the local oscillator signal input to the multi-channel inverter; where the frequency of the local oscillator signal is used as the center frequency of the output signal of the adjustable signal generator, and use the spectrum analyzer to test the center frequency point The magnitude of the output signal is denoted as P 0 .
可调信号发生装置以大频率步进减小频率值，可调信号发生装置的输出功率大小不变，当频谱分析仪测试输出信号PL小于(P0-3dBm)时，可调信号发生装置频率不再减小；然后可调信号发生装置以小频率步进增加频率值，当频谱分析仪测试的输出信号PL大于(P0-3dBm)时，可调信号发生装置频率不再增加，可调信号发生装置以更小的频率步进减小频率值，直到频谱分析仪测试的输出信号PL在(P0-3±0.01dBm)范围内时，记下此时频谱分析仪的测试频率值fL，得到多通道变频器通频带的下限截止频率。The adjustable signal generating device reduces the frequency value in large frequency steps, and the output power of the adjustable signal generating device remains unchanged. When the spectrum analyzer test output signal P L is less than (P 0 -3dBm), the adjustable signal generating device The frequency no longer decreases; then the adjustable signal generating device increases the frequency value in small frequency steps, and when the output signal PL tested by the spectrum analyzer is greater than (P0-3dBm), the frequency of the adjustable signal generating device no longer increases, and can The tuning signal generating device reduces the frequency value in smaller frequency steps until the output signal P L tested by the spectrum analyzer is within the range of (P 0 -3±0.01dBm), record the test frequency of the spectrum analyzer at this time value f L , get the lower limit cut-off frequency of the passband of the multi-channel inverter.
多通道变频器通频带的上限截止频率测试时，可调信号发生装置以大频率步进增加频率值，可调信号发生装置的输出功率大小不变，当频谱分析仪测试输出信号PL小于(P0-3dBm)时，可调信号发生装置频率不再增加；然后可调信号发生装置以小频率步进减小频率值，当频谱分析仪测试的输出信号PL大于(P0-3dBm)时，可调信号发生装置频率不再减小，可调信号发生装置以更小的频率步进增加频率值，直到频谱分析仪测试的输出信号PL在(P0-3±0.01dBm)范围内时，记下此时频谱分析仪的测试频率值fH，得到多通道变频器通频带的上限截止频率。通过计算，得到多通道变频器通频带BW，即BW＝fH-fL。When testing the upper limit cut-off frequency of the passband of the multi-channel inverter, the adjustable signal generating device increases the frequency value in large frequency steps, and the output power of the adjustable signal generating device remains unchanged. When the spectrum analyzer test output signal PL is less than ( P 0 -3dBm), the frequency of the adjustable signal generating device will no longer increase; then the adjustable signal generating device will reduce the frequency value in small frequency steps, when the output signal P L tested by the spectrum analyzer is greater than (P 0 -3dBm) , the frequency of the adjustable signal generating device will no longer decrease, and the adjustable signal generating device will increase the frequency value in smaller frequency steps until the output signal P L tested by the spectrum analyzer is in the range of (P 0 -3±0.01dBm) When the time is within, write down the test frequency value f H of the spectrum analyzer at this time, and obtain the upper limit cut-off frequency of the passband of the multi-channel inverter. Through calculation, the passband BW of the multi-channel frequency converter is obtained, that is, BW=f H -f L .
在本发明中，只使用信号发生器和频谱分析仪就能完成多通道变频器的通频带测试，连接方便，不需要在测试之前进行复杂的校准过程，而是采用频率步进动态调节和频率步进方向自动调整技术，提高了测试速度，还能保证测试精度。In the present invention, only the signal generator and spectrum analyzer can be used to complete the passband test of the multi-channel frequency converter. The automatic adjustment technology of the stepping direction improves the test speed and ensures the test accuracy.
上述虽然结合附图对本发明的具体实施方式进行了描述，但并非对本发明保护范围的限制，所属领域技术人员应该明白，在本发明的技术方案的基础上，本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围以内。Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.
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