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同相正交调制（IQ 调制）是通信应用中使用的主要调制方案。 它之所以受欢迎，是因为它能高效利用带宽，满足这个数据量急剧增长的世界对带宽越来越迫切的需求。 使用仿真的 IQ 信号进行测试非常重要，因为设计人员在充斥干扰的频谱中总是会面临带宽不足的困境。
例如，设计人员需要测试其设计的极限性能，从而确保它们在真实环境中能够正常运行。 为此，他们必须首先生成一个理想信号来测试设计的理想性能。 因此，他们必须生成一个高品质的已知纯净信号。
他们可以通过调整两个通道之间的增益平衡以及每个通道的幅度偏移来仿真非理想的 IQ 信号。 他们甚至可以调整偏移，以皮秒级分辨率及时移动 I 或 Q 基带信号。 某些函数发生器支持您执行更先进的调制，将噪声、随机抖动或确定性抖动添加到信号中。
Spectrum analyzers measure the amplitude of an input signal versus frequency over the entire frequency range to determine the power of the signal. Spectrum analyzers are capable of performing tests such as noise figure and signal-to-noise ratio (SNR) to characterize the performance of a device and its contribution to overall system performance. For more information, see the application guide Spectrum Analysis Basics. ,
View Full VersionWhy do you need to measure current? In this article, we will cover the reasons for measuring current, how to measure current and what to look for when measuring current. We cannot see the current that is flowing with our own eyes. Therefore, specialized measuring instruments are needed to measure current and other parameters. But why do we need to measure current? And how should we measure it? This article will detail the reasons for the need to measure current...
View Full VersionA benchtop DC power supply is a power supply that is mounted to an engineer's workbench for use. It usually has a large, legible display and user interface to allow the engineer to easily achieve full control of the power supply from the front panel. Users can also control modern benchtop power supplies through software. In addition, engineers can easily access the output terminals from the front. Variable bench power supplies are a convenient electric...
View Full VersionDigital multimeters are used, and this article will detail their advantages and disadvantages. ■ SUMMARY Electronic devices are powered by electricity. However, because electricity is invisible, it is necessary to use measuring instruments such as digital multimeters to check their safety and quality and to find out why malfunctions occur. Digital multimeters have so many buttons and ports that many people find them difficult to manipulate at first...
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