EMERSON DXA-480
EMERSON DXA-480
欠采樣
欠采樣技術中,ADC采樣率低于模擬輸入頻率,該條件下將引起混疊。根據奈奎斯特定理,自然知道欠采樣將丟失信號信息。然而,如果對輸入信號進行正確濾波,以及正確選擇模擬輸入和采樣頻率,則可將包含信號信息的混疊成分從較高頻率搬移至較低頻率,然后進行轉換。該方法有效地將ADC用作下變頻器,將較高帶寬信號搬移到ADC的有效帶寬。要想該技術取得成功,ADC跟蹤-保持電路的帶寬必須能夠處理預期的zui高頻率信號。
單極性
對于單端模擬輸入ADC,單極性信號輸入范圍為零幅(通常為地)至滿幅(通常為基準電壓);對于差分輸入ADC,信號輸入范圍為零幅至滿幅,以正輸入相當于負輸入測量輸入范圍。
零幅誤差
參見失調誤差(單極性)。
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