For the dc circuit in Fig. 1.1, the drain voltage is determined from
Equation 1.3
As illustrated in Fig. 1.2, for the purpose of a solution to (1.3), the transistor can be replaced by a current source as shown in Fig. 1.2. Drain current ID is a function of VG; that is, ID = f(VG). Thus, in a design, the value of VG determines the value of VD. ID is related to VG according to
Equation 1.4
This relation and parameters Vtno and kn are discussed in Unit 2.
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