The Augmented Harmonic Balance Method(AHBM)is developed for analysis of the general nonlinear microwave circuits.The concepts of differential linearized network and nonlinear adjoint network are introduced so that the formulation
computation and implementation of AHBM are rather simple and efficient and the program can be developed straightforward based on the existing frequency-domain linear microwave circuits CAD software.For the circuits of multistage structure
the relaxation technique based on AHBM is proposed to reduce the storage requirement.