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OPA380/OPA727的+in输入端偏置电压大小问题

Other Parts Discussed in Thread: OPA727, OPA380

从DATASHEET看到OPA380/OPA727的-in接光电二极管,+in接个偏置电压可以降低二极管的结电容,从而降低其产生的噪声对整个放大电路的影响。

请问这个偏置电压的大小怎么选取比较合适?如果不加这个偏置电压对电路的影响有多大?