Transient Analysis of Microwave Oscillators by Krylov-Subspace Harmonic Balance

Transient analysis in microwave oscillators includes problems of primary importance such as oscillation buildup at bias turnon and frequency settling in VCOs. Until now this class of problems has been tackled by two families of algorithms, i.e., either rigorous but computationally inefficient time-domain methods, or fast but approximate envelope-oriented techniques. The paper shows that an excellent trade-off retaining the advantages of both the above without significant shortcomings, may be achieved by Krylov-subspace based inexact-Newton harmonic-balance (INHB) analysis.