New behavioral-level simulation technique for RF/microwave applications. Part I: Basic concepts

The quadrature modeling technique is nowadays widely used for the nonlinear simulation of RF/microwave communication circuits and systems at the behav ioral (system) level. It allows one to simulate the circuit/system performa nce under real-world conditions and signals (using several thousand sample frequencies) and to predict such parameters as adjacent channel power ratio , spectral regrowth, and error vector magnitude in a computationally effici ent way. But it is a narrowband technique and, consequently, cannot predict harmonics of the carrier frequency and even-order nonlinear products, to a ccount for the circuit/system frequency response and the bias decoupling ne twork effect. Here, we propose a new behavioral-level simulation technique (instantaneous quadrature technique) that overcomes these drawbacks, and de monstrate its validity through measurements and harmonic balance simulation . The transformation of envelope transfer characteristics into instantaneou s ones is also discussed in detail. (C) 2000 John Wiley & Sons, Inc.