描述

全諧波失真(THD)和SINAD相似，但它只包含諧波分量不包括噪聲。在這個(gè)比值計(jì)算中，基波分量是分母而不是分子。DAC的輸入為一個(gè)正弦波的數(shù)字代碼；其輸出是階梯狀的正弦波輸出，需要通過一個(gè)濾波器進(jìn)行平滑處理。經(jīng)濾波后的輸出波形再在頻域進(jìn)行分析，尋找與基波頻率相關(guān)的諧波分量。

互調(diào)失真(IM)用于測(cè)試由兩種頻率互調(diào)而產(chǎn)生的非諧波分量的失真。這種失真是由待測(cè)芯片的非線性度而引起的。測(cè)試該參數(shù)時(shí)：先給待測(cè)DAC輸入兩個(gè)頻率分量的波形數(shù)字代碼，再計(jì)算輸出波形中的兩個(gè)頻率之和及之差信號(hào)分量。

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