PGA280使用时,输入端是否要对地接一个10-20M的电阻?特别是输入接隔直电容,测试交流时。
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如果是交流耦合,加一个电阻到地可以将直流工作点重建到GND,但是有必要加这么大的电阻?如此大的电阻有可能使直流工作点建立时间比较长。