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【简答题】
图11.12.1电用D/A转换器CB7520和运算放大器组成的增益可编程放大器,它的电压放大倍数 由输入的数字量D(d 9 ~d 0 )来设定。试写出A V 的计算公式,并说明A V 取值的范围是多少。
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