德州仪器指南上面提到逐次比较型ADC在前级运放之间要加一个RC回路,目的是提供电荷和隔离。但是如果需要测量的是方波或者是频率比较高的正弦波,会不会因为RC回路的低通特性影响波形呢?能不能在逐次比较型ADC前面自己做采样保持电路呢?望解答。
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