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 RFrmicrowave communication circuits and systems at the behavioral sys) tem level. It allows one to simulate the circuitrsystem performance 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 efficient way. But it is a narrowband technique and, consequently, cannot predict harmonics of the carrier frequency and even-order nonlinear products, to account for the circuitrsystem frequency response and the bias decoupling network effect. ( Here, we propose a new behavioral-level simulation technique instantaneous quadrature ) technique that overcomes these drawbacks, and demonstrate its validity through measurements and harmonic balance simulation. The transformation of envelope transfer characteristics into instantaneous ones is also discussed in detail. Q 2000 John Wiley & Sons, Inc. Int J RF and Microwave CAE 10: 221]237, 2000.