[問題]OP 減法器電路一問
各位板上的前輩好~
小弟最近在做一個減法器電路
輸入端為一個弦波但offset是不固定的
所以想用減法器去減掉
簡略一下示意圖如下
-------------
DAC--------
減法器 ----------輸出------ADC
input------
-------------
由ADC得到的值輸出去控制DAC 使OFFSET可以保持再想要的位置
但目前遇到一個問題....
當我減的越多其訊號的振幅會越小
例如 位準在1.5V時振幅是1V 但位準在1V時振幅可能只剩下0.8V
想請問一下是為什麼?是否有哪裡沒有想到呢?
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10/17 00:08, , 1F
10/17 00:08, 1F
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10/17 22:38, , 17F
10/17 22:38, 17F
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10/18 01:28, , 18F
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10/18 17:24, , 24F
10/18 17:24, 24F