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Broadband noise in amplifier but narrow bandwidth measurement

Question asked by beatouyoo on Nov 3, 2011
Latest reply on Nov 4, 2011 by prb



I have a signal at 50nA 1GHz, but the amplifier has an input current noise of 20pA/rt.Hz. So the broadband noise is 640nA at 1GHz BW, 20nA at 1MHz BW and 20pA at 1Hz BW. If I am going to use a spectrum analyzer which is set a span bandwidth of 10Hz around 1GHz. Am I going to see this 1GHz signal in the spectrum analyzer? Thank you.