需要采集压电式加速度传感器产生的低频信号,1kHz以下,采用电荷放大器将电荷信号转成电压信号(几十mV),然后经过低通抗混叠,积分,和高通,再经过放大给AD采集,AD拟采用ADS8519的±10V范围,AD采集频率10kHz。
问题1:低通抗混叠的频率选多少为好?
问题2:有什么合适的四运放可以用?
问题3:低通抗混叠放在积分前好还是放在AD前比较好?
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