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双极型运放OPA855输出的直流偏置电平不对

Other Parts Discussed in Thread: OPA855

大家好:

   我使用的OPA855,电路如下图,发现运放输出的直流偏置电压不对,运放电源电压4.82V。

测得Vp=1.452V,输出脚的直流电平为1.26V,按照我的理解,考虑到手册中给出的Ib的值,输出直流电平应该和Vp点的电压非常接近才对,非常不解。

我测量时使用的万用表。