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Table 4 Noise analysis of signal chain blocks

From: A new portable ELF Schumann resonance receiver: design and detailed analysis of the antenna and the analog front-end

Block description Equivalent rms input noise (nV)
Induction coil thermal noise 44.7
Preamplifier 21.02
Low-pass and notch filter 1588.3
Double notch filter 1415
Double low-pass filter 3977.5
High pass filter 1287
Voltage gain amplifier 555.75 to 1482.1 × 103