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DAC3162两路DAC输出相位偏移

Other Parts Discussed in Thread: DAC3162

Dear TI专家:

                      我在使用DAC3162输出正交信号时,频率低时(200KHz)两路DA的正交效果很好,基本上是严格的90度,但是当频率逐渐升高时,IQ信号相位开始发生不正交的现象,输出频率为20MHz时两路信号相位差只有70度左右。

                     这种现象一般会由什么原因引起呢?

感谢!