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科普知識
數據分類：
運算放大器

集成運算放大器的組成結構

發布日期：2022-04-17 點擊率：91

集成運算放大器由輸入級、中間級、輸出級和偏置電路組成。
輸入級：具有很高的輸入電阻，能夠減小零點漂移和抑制干擾。輸入級都采用帶恒流源的差分放大電路。
中間級：具有很高的電壓放大倍數，通常采用帶恒流源的共射放大電路。
輸出級：驅動負載，要求輸出阻抗低，帶負載能力強，通常采用互補對稱電路或設計輸出器構成。
偏置電路：為各級放大器提供靜態工作點，由鏡像恒流源等電路構成。


圖  運算放大器框圖



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