DEUBLIN 1109-011-192
DEUBLIN 1109-011-192
噪聲性能
該電路的輸出噪聲是ADC輸出數(shù)據(jù)速率的函數(shù)。表1顯示數(shù)字化數(shù)據(jù)相對于ADC采樣速率的有效位數(shù),假設(shè)滿量程輸出電壓為2.5 V。噪聲性能與LVDT內(nèi)核位置無關(guān)。
表1. 噪聲性能與帶寬的關(guān)系
如果ADA2200輸出噪聲與頻率無關(guān),則預(yù)計有效位數(shù)將在輸出數(shù)據(jù)速率每4×下降時增加一位。ENOB在較低輸出數(shù)據(jù)速率下不會上升太多,這是由于ADA2200輸出驅(qū)動器的1/f噪聲所導(dǎo)致的;該噪聲在較低的輸出數(shù)據(jù)速率下成為噪底的主要成分。
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