Modified determinations of stability criteria for accurate design of the linear two-port amplifiers

Liu et al. (1994) showed that the unconditionally stable area is shown in the Smith chart by plotting all the reflection coefficients of Γ_s,Γ_in,Γ_out,Γ _l. The available matching area is specified by using the modified determinations of the stability criteria. It is applicable to the design of linear two-port amplifiers. The present brief correspondence shows that Fig. 2 in Liu et al. can be redrawn. Meanwhile, more detailed performances of this figure are discussed. The reflection coefficients of the operating points in a Smith chart are used to demonstrate the four-gamma method