8.6. Common-Mode Voltage Gain
The common-mode gain is defined for the same voltage applied simultaneously to both inputs. The output must be the same at either output terminal (again assuming that gm1 = gm2 and RD1 = RD2). For example, for the output Vd2, the gain can be determined by a superposition of gains, inverting (input, Vg2) and noninverting (input, Vg1), with RD2 in both equations.
Using (8.19) (noninverting) and (8.20) (inverting), the gain for finite Rbias is, accordingly,
Equation 8.25
which is
Equation 8.26
The result is that ...
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