Analog Electronics with LabVIEW®

4.2. Transistor Variable Incremental Relationships

As illustrated previously diagrammatically, for example, in Fig. 3.2, the MOSFET is a four-terminal device. The four-terminal version of the schematic symbol is repeated here in Fig. 4.2. The terminals again are the source, drain, gate, and body. The drain current and the three terminal-pair voltages are all interdependent such that i_D = f(v_DS, v_GS, v_SB). Use of the three-terminal schematic symbol for the transistor, as in Fig. 4.1, conveys the assumption that the body and source are connected. For an applied incremental V_gs, for example, there will be, in response, incremental drain current I_d and incremental voltages V_ds and V_sb. The linear model is based on relating the current to the three ...