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Table 5 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 Noise figure (dB) at 10 Hz
Preamplifier 11.76
Low-pass and notch filter 49.02
Double notch filter 45.89
Double low-pass filter 57.18
High-pass filter 36.71
Voltage gain amplifier 27.77 to 104.62