Detector internal preamplifier after weak electric signal amplification, comparing to send alarm processing.
检测器内部的前置放大器将微弱的电场信号放大后，送报警器进行比较处理。
2
The 12-bit ADC in C8051F020 samples the EEG signal amplified by the preamplifier.
脑电信号通过前置放大器放大后，由C8051F 020内部的12位ADC进行采样。
3
The function blocks of the low field NMR circuit system are analyzed at first. Then the signal amplitude is calculated. The antenna interface and the preamplifier are studied in detail at last.