Improving the matching of RF signal generators

　　The measurement uncertainty of a signal generator refers to the fact that due to the output impedance of the signal generator not being the ideal 50 Ω, a portion of the output signal will be reflected back after entering the ideal load, and the signal generator cannot fully absorb this portion of the reflected signal. Some of the reflected signals will be output to the load again, and this back and forth reflection will change the effective input level of the tested device, leading to measurement uncertainty. Each signal generator has a key indicator, VSWR, specifically designed to measure its measurement uncertainty.

　　A simple and effective method to improve the measurement uncertainty of RF signal generators is to connect a well matched fixed attenuator to the output end of the signal generator.

　　When we have high requirements for a certain indicator but our signal generator cannot meet them, the above methods can be used as temporary solutions. However, these methods all require additional costs and will make the entire testing system more complex. Therefore, when applying them, comprehensive consideration is needed to ensure that we can achieve our testing objectives without introducing new errors.

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