P0997AL

描述

全谐波失真(THD)和SINAD相似，但它只包含谐波分量不包括噪声。在这个比值计算中，基波分量是分母而不是分子。DAC的输入为一个正弦波的数字代码；其输出是阶梯状的正弦波输出，需要通过一个滤波器进行平滑处理。经滤波后的输出波形再在频域进行分析，寻找与基波频率相关的谐波分量。

互调失真(IM)用于测试由两种频率互调而产生的非谐波分量的失真。这种失真是由待测芯片的非线性度而引起的。测试该参数时：先给待测DAC输入两个频率分量的波形数字代码，再计算输出波形中的两个频率之和及之差信号分量。

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