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用LMV551和mos管做恒流源，同相端输入0的时候，运放输出为什么是3v？
mos管拆掉也一样。
这是通过反馈系统, 由电路决定的.
这个电压正好让 MOS 管工作在放大状态并得到所要的电流.
请教一下，怎样让同相端输入0的时候，mos管不导通呢？
