Analog Electronics with LabVIEW®

5.3. Linearity of the Gain of the Common-Source Amplifier

The connection between I_d and V_gs is linear provided that V_gs is small enough, as considered in the following units. Use of the linear relations also assumes that the output signal remains in the active region (i.e., neither in the linear region nor near cutoff). This is discussed below. NMOS subscripts are used. The results are the same for the PMOS, with a “p” subscript substituted for “n” and the subscript order reversed for all bias-voltage variables.

5.3.1. Nonlinearity Referred to the Input

The general equation again is (3.8)

Then using I_d = i_D – I_D and v_GS = V_GS + V_gs, the equation ...