Title :
A new nonlinear time-domain op-amp macromodel using threshold functions and digitally controlled network elements
Author :
Pérez-Verdu, Belén ; Huertas, José L. ; Rodríguez-VÁzquez, Angel
Author_Institution :
Dept. de Electr. y Electron., Sevilla Univ., Spain
Abstract :
A general-purpose nonlinear macromodel for the time-domain simulation of integrated circuit operational amplifiers (op amps), either bipolar or MOS, is presented. Three main differences exist between the macromodel and those previously reported in the literature for the time domain. First, all the op-amp nonlinearities are simulated using threshold elements and digital components, thus making them well suited for a mixed electrical/logical simulator. Secondly, the macromodel exhibits a superior performance in those cases where the op amp is driven by a large signal. Finally, the macromodel is advantageous in terms of CPU time. Several examples are included illustrating all of these advantages. The main application of this macromodel is for the accurate simulation of the analog part of a combined analog/digital integrated circuit.<>
Keywords :
circuit analysis computing; equivalent circuits; linear integrated circuits; linear network analysis; modelling; monolithic integrated circuits; operational amplifiers; time-domain analysis; CPU time; MOS type; analogue part simulation; bipolar type; combined analog/digital integrated circuit; digitally controlled network elements; integrated circuit operational amplifiers; large signal driving; mixed electrical/logical simulator; monolithic IC; nonlinear time-domain model; op-amp macromodel; threshold functions; time-domain simulation; Bipolar integrated circuits; Circuit simulation; Computational modeling; Digital control; Digital integrated circuits; Integrated circuit modeling; Operational amplifiers; Time domain analysis; Timing; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
