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Table 3 Signal conditioning stage passband gain values

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

Cascaded stage number

Electronic circuit

Passband gain value (dB) at 10 Hz

1

Preamplifier

35.5

2

Low-pass and notch filter

3.5

3

Double notch

3.3

4

Double low-pass filter

10

5

High-pass filter

5

6

Voltage gain amplifier

1 to 20

Total passband gain, 20501 to 410,020 (86 to 112) dB at 10 Hz