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关于运放的输入电阻和反馈电阻的选择?

选择不同的运放时,我们都知道要选择合适的输入电阻及反馈电阻,有的运放增益G=10,选择Rs=100R,Rf=1k,而有的运放选择Rs=10k,Rf=100k,请问各位输入及反馈电阻的选择是根据什么参数来计算的?体现在datasheet里面的哪些参数上?