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把工业的+-10V的电压信号，负半轴截止掉，正半轴>3.3V的都钳位在3.3V，或者把输入信号的正半轴成比列缩小。用二极管钳位可以实现，想问一下有没有比较典型的推荐电路？一般AD前面的保护电路都是怎么去做的？
