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analog-to-digital-converterに関するnabinnoのブックマーク (3)
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nabinno 2018/11/18
- microchip
- microchip-mcp3002
- analog-to-digital-converter
- electronic-component
- electrical-engineering
- raspberry-pi
リンク -
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アナログ-デジタル変換回路 - Wikipedia
変調方式の一種として見た場合は、A/D変換はパルス符号変調である。A/D変換のような操作をデジタイズということがある。 基本的なA/D変換の操作は、まずサンプリング周波数で入力を標本化し、それを量子化することでおこなう。標本化にともなう折り返し雑音は、重要な問題である。また、量子化にともなう量子化誤差による量子化雑音もある。 原理[編集] 「比較器」とは、入力電圧を基準電圧と比較して、基準より高いか低いかを出力する回路であり、1bitのAD変換器と言える。 フラッシュ型（並列比較型）[編集] フラッシュ型（並列比較型） bit出力のAD変換であれば、個の比較器を用意して変換を行う。たとえば0Vから15Vまで1V間隔でAD変換して4bit出力を得る場合であれば、1Vから15Vまで15個の比較器を用意して入力と比較を行い、必要があればそれらの出力を2進数にエンコードする。 原理が単純であり、比
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