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。
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 preamplifier.
出处
《安全与电磁兼容》
2013年第4期65-67,72,共4页
Safety & EMC
关键词
电磁兼容
电磁干扰
射频前置放大器
增益
噪声
electromagnetic compatibility
electromagnetic interference
RF pre-amplifier
gain
noise
