10.2. Signal Voltage Gain
The expression for the gain of the basic common-source amplifier, (5.4), which includes the output resistance of the driver transistor, is
In the signal circuit, as shown in Fig. 10.3, RD is replaced by 1/gds2. The new equation for this circuit is
Equation 10.2
Figure 10.3. Linear circuit of the common-source amplifier. The load is now the output resistance of the current source load, 1/gds2.
or with gm = 2ID/V ...
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