A nonlinear macromodel for current backward transconductance amplifier

A SPICE-compatible macromodel for emulating the nonlinear behavior of the current backward transconductance amplifier (CBTA) at low-frequency is developed. The novelty of the proposed macromodel is that real physical active device performance parameters together with parasitic elements of the input-output terminals of the CBTA are taken into account. In a first step, the CBTA is designed with +/- 2.5 V by using standard CMOS technology of 0.35 mu m AMS and the main performance parameters, such as: DC gain, bandwidth, slew-rate, dynamic range, along with parasitic elements are obtained. In a second step, the behavioral model of the CBTA is deduced and the SPICE-compatible macromodel is built. In a third step and to validate the deduced behavioral model, two topologies of saturated nonlinear function series (SNFS) based on CBTA are designed. At this point, a generated experimentally chaotic signal was applied as excitation signal to each SNFS built with the CBTA at the transistor level and to the proposed SPICE-compatible macromodel. As a consequence, the derived macromodel can effectively be used for forecasting the behavior of nonlinear circuits in the time-domain with good accuracy, decreasing the CPU-time compared with the model at the transistor level of abstraction. (C) 2020 Elsevier GmbH. All rights reserved.