第二册第55页中用到一个公式
i_load = ( u_x+ - u_x- ) / R_SENSE
这里是否用到了R_SENSE电流和R_L电流相等？但由于差动放大器匹配电阻的分流作用，这两个电阻上的电流应该是不是应该有差异的吗？
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