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OPAMP-NOISECALC: OPA855

Part Number: OPAMP-NOISECALC

您好,在放大器噪声系数计算一文中,4.1小节 Inverting输入运放噪声系数计算,列举了以下公式,

我的理解是该物理量代表输入源在TIA反相输入端时的Gain,如果Rs为Source Resistor,则此时 Vo/Vi = Rf / (Rs + Rm || Rg) (TIA反相输入端节点虚短为GND),请问为什么资料中为Rf / Rg,期待您的回复,感谢~

此外我在进行TIA输入电压噪声计算的时候,是代入Inverting输入运放噪声模型,还是Non-inverting模型呢?