8.3. Signal Voltage Gain of the Ideal Differential Amplifier Stage

This initial assessment of the gain of the differential amplifier neglects the effects of the bias resistor, Rbias, and of the output resistance of the transistors as well as the body effect. These effects are considered below. To generalize the discussion to include the possibility of inverting and noninverting modes of operation, we base the discussion on the circuit (Fig. 8.2) with a drain resistor for both transistors. The inverting and noninverting modes take, respectively, the outputs at Vd1 = Vo1 (av1) and Vd2 = Vo2 (av2). Also, this is the configuration that is studied in the project on the differential amplifier. Note that the input could arbitrarily be moved to the ...

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