BEHAVIORAL MACROMODELING OF VOLTAGE FEEDBACK AMPLIFIERS

This paper presents a new voltage feedback amplifier macromodel at behavioral level. It accurately models basic differential-mode and common-mode electrical characteristics, the input offset voltage and current, the differential-mode and common-mode amplification, the input voltage noise, the output voltage swing, short-circuit current and the input and output impedances. For creating the model, simplification and build-up techniques known from modeling operational amplifiers have been adapted. Model parameters are extracted for the OP177F from Analog Devices as an example. To confirm the validity of the proposed macromodel, simulation results are compared with the manufacturer’s data and with the behavior of the SPICE-based macromodel OP177F/AD from the standard library. The proposed behavioral macromodel leads to a low analysis time, with higher accuracy and a better convergence in comparison with other op amps methods of modeling.