我使用THS7001进行程控放大，pre-amp连接成了一个射随，后级程控增益选择10倍档，当输入信号的频率超过1M的时候就会衰减，到15M的时候衰减成了5倍的增益，请问这是为什么？THS7001的带宽不是有70M吗
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