13.2. Amplifier Gain of Differential Amplifier and Common-Source Stage in Cascade
In the example of Fig. 13.1, a differential stage and a common-source stage are connected in a cascade configuration; the input of the common-source stage is the output of the differential stage. The overall voltage gain is defined as av = vo/vi = vd3/vg1. But this is also
Equation 13.1
Therefore, the gain can be calculated by using the separate expressions considered previously for the differential amplifier stage [(8.15)] and the common-source stage [(5.5)]. This leads to
Equation 13.2
or using, from (4.5), gm = 2ID/Veff,
Equation 13.3
Throughout ...
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