Meta-stability of Behavioural Models of Integrated Circuits with DC and RF Sub-Models

A black-box model architecture with separate DC and RF sub-models is presented that enables building accurate behavioural models of nonlinear integrated circuit blocks for time-domain (transient) simulations with or without an initial condition file. The methodology for separating the DC and RF behaviour of the modelled circuit is presented in Verilog A. The nonlinear RF sub-models are built using echo state networks (ESN). The meta-stability of the model operating point in the large-signal simulation is observed as a function of the ESN characteristics, and a test for model meta-stability is defined. The behavioural model accuracy in the top-level simulation is quantified and the presented methodology is evaluated on a voltage reference test case.