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REF102的恒流源怎么不恒流?

Other Parts Discussed in Thread: REF102, OPA277

如上图,唯一不同地方是运放换成了OPA124UA,R1为1.1K左右,负载中电阻变化量仅仅为47欧姆时,电流竟然从8MA降到7.7MA!。测量REF102的4||6之间电压,只有8.2V,并不是额定的10V。同时测量运放正输入端与REF102第六脚之间电压,竟然是11.4V。这是为什么呢?检查电路并没发现错误——如果把OPA124部分摔掉,则REF102的输出是9.98V,正常。——特此求教