EMI测试中射频前置放大器的噪声及影响
Noise and Effect of RF Pre-amplifier in the EMI Testing
摘要 在电磁干扰(EMI)测试中,射频前置放大器被用来放大微弱信号使其能被准确测量,而其噪声经常被忽略。比较了电场强度背景噪声的理论计算和实际测试结果,得出电场强度的背景噪声值取决于射频前置放大器的输入噪声。因此,噪声这一参数和前置放大器的增益同样影响着该放大器的实际效用。
关键词 电磁兼容;电磁干扰;射频前置放大器;增益;噪声
Abstract RF pre-amplifier was used to amplify weak signal so as to measure it correctly
while the noise of RF pre-amplifier was frequently neglected during electromagnetic
interference (EMI) tests. The result that the ambient noise of electric field strength is
also depend on the input noise of RF pre-amplifier was obtained by comparing the
value of theoretic calculation and practical testing. Therefore, the parameter, noise
affected the practical function of the RF pre-amplifier as well as the gain of RF
pre-amplifier.
Keywords electromagnetic compatibility; electromagnetic interference; RF
pre-amplifier; gain; noise
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