Then the low noise amplifier amplifies the signal.Band pass filter and correlated demodulator and other circuits were also used to improve the signal noise ratio and reach wanted amplitude.

• 之后，前置级的输出信号经过低噪声放大器进行放大，再通过带通滤波以及相关解调等电路实现检测系统需要的输出幅值和信噪比。