Patent ID: 7019594

Claim:
An apparatus for analyzing performance of a multi-stage radio frequency amplifier, comprising: an input power source circuit; a front-stage matching network receiving power provided by the input power source circuit; a mid-stage network connected in back of the front-stage matching network and receiving power transferred by the front-stage matching network, wherein a plurality of single-stage amplifiers and a plurality of mid-stage matching networks are in the mid-stage network; a back-stage matching network connected in back of the mid-stage network; and an output circuit connected in back of the back-stage matching network; wherein the mid-stage network further comprises a plurality of single-stage amplifiers and a plurality of mid-stage matching networks, and every mid-stage matching network is clipped between two single-stage amplifiers, wherein a power source terminal reflection coefficient Γ S of front stage matching network and a load reflection coefficient Γ L of the back stage matching network are obtained respectively, the power source terminal reflection coefficient Γ S is adjusted to be maximum power source terminal reflection coefficient Γ S,max for conjugate matching with an input reflection coefficient Γ IN of the mid-stage network, and the load reflection coefficient Γ L is also adjusted to be maximum load reflection coefficient Γ L,max for conjugate matching with an output reflection coefficient Γ OUT of mid-stage network.