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您好，
1、和2、下面文档 Examples 部分讲了双巴伦信号质量更好的原因，且对2种用法的输出信号在相位失衡和幅值偏差方面做了比较
https://www.analog.com/media/cn/analog-dialogue/volume-39/number-2/articles/transformer-coupled-front-end-a-d-converters_cn.pdf
3、ADC3421不能应用 24GHz 的频率信号，因为它的输入带宽为540MHZ
