電子増倍型 (Electron Multiplying) CCD (以降EM-CCD) は、フレームトランスファCCDと同様の構造をしていますが、水平レジスタと出力アンプの間に特殊な増倍レジスタを備えています。EM-CCDは、入射する光子にさらされる画素 (検出領域) と、光子が検出されないように全体がマスクされた領域 (記憶領域) の2つに分離されています。検出領域の信号は記憶領域に転送され、インパクトイオン化と呼ばれる処理によって増倍レジスタで増倍されます。
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