8.7. Voltage Gains Including Transistor Output Resistance

In Project 9 we measure the gain of a “balanced” stage with drain resistors for both transistors. The amplifier is the PMOS version of the NMOS amplifier of Fig. 8.2. We obtain an exact Level 1 SPICE solution for the gains for both outputs. The example is used to explore the use of a simulator for obtaining precision results to compare with simple hand calculations.

For larger λn values (NMOS), the output resistance can influence the gain and complicate the gain expressions considerably. Here we consider the effect due to gds1 and gds2 while retaining the effect of Rbias. In the following, the gain of the inverting input, av1, is obtained again as a common-source stage with source resistance. ...

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