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电流型运放的使用

Other Parts Discussed in Thread: OPA695

你好,如图所示,R3400左端输入的是1.25v的直流电平,我们使用的是OPA695ID,这样的话6脚的输出理论上为1.25V的电平,但当我将OPA6965ID更换成AD8009时,其他参数不变,则输出6脚为负3.9V,OPA695的3脚不为1.25V,而为负的1.8v,有么有大神能帮我解释一下这个现象吗,谢谢!