VHDL-AMS Model Development for Digitally Programmable Monolithic Instrumentation Amplifiers

A simple behavioral model has been developed for monolithic instrumentation amplifiers (in-amps) with digitally programmable gains. The model is based on the physical structure of the three - operational amplifiers in-amp (3-op amps in-amp) topology. In comparison with SPICE-based simulation standard macro-model the proposed model uses a reduced number of nodes and has shorter simulation time, without limiting the number of modeled electrical parameters. The in-amp model is implemented by using very-high hardware description language (VHDL) analog and mixed-signal language (VHDL-AMS), and accurately simulates the static and dynamic electrical parameters. The VHDL-AMS code is created on the basis of set of analytical equations and is adapted to the simulators of the Systemvision® (version 5.5) and the Systemvision® Cloud environment.