Analog Electronics with LabVIEW®

8.8. Body Effect and Voltage Gain

In Project 9 we are able to connect the sources of the transistors to the chip body. Certainly, in general this cannot be done such that there is a body effect associated with the differential-amplifier-stage transistors. The necessary alterations to the gain equations are determined in the following. At the end of this unit, we will have the complete, precision-gain calculation equations of Level 1 SPICE. It will be informative to consider numerical results that are based on various degrees of approximations, and this is done below.

8.8.1. Common-Source Stage and Body Effect

With the body effect present, a component of current, g_mb1V_s (Fig. 8.6), is subtracted from g_m1V_gs1 such that (8.28) for this case is ...