The one step linear modulation was realized by the use of calculation amplifier of precedent phase on three steps with two differential circuit, which can bate the disturbance effectively and advance the signal to noise ratio.
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释义
对强干扰下的声波信号采用两级差动放大 ,采用相位超前型三运放二阶电路 ,实现一级增益线性调节。
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