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双电源运放在接成单电源电路时,作为偏置的直流电压是用电阻分压好还是接参考电压源好?

有人建议用参考电压源,理由是精度高,此外还能提供较低的交流旁路。

有人建议用电阻,理由是成本低而且方便。

若综合考虑可有?