High Level Model for a Simple Transconductance Operational Amplifier

In the CAD of complex electronic circuits there is a lack of high-level of abstraction in the modeling of analog modules for efficient simulation. Fuzzy systems, considered as universal approximators, are appropriate to build functional model of the analog modules. The paper presents a method to develop a fuzzy functional model for a very common analog module, a CMOS operational transconductance amplifier. We developed a functional model of the input-output relation of the amplifier in the Matlab environment. The model takes into consideration the frequency behavior and the non-linearity of the voltage transfer characteristic of the amplifier. The numerical results obtained with our fuzzy model for different frequencies, different amplitudes and different signal shapes prove a high modeling accuracy