《ADA输出峰峰值不到2V》

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Q:我用 125M 采样率输出 1.25MHz 频率的信号,DA输出峰峰值不到2V，什么原因？

A:您设置的频率太低了，建议将频率设置到六七十兆左右看看。

请查看ADA子卡电路图，信号输出的时候有通过一个变压器，隔直把低频都滤掉了，靠近直流区间的信号会有所衰减。