Behavioral model of Track-and-Hold Amplifier based on GaAs HBT by using MATLAB- SIMULINK

A comprehensive behavioral model of Track-and-Hold Amplifier (THA) based on GaAs HBT, implemented in MATLAB-SIMULINK platform, is presented in this paper. The main error sources of the holding capacitor and non-linear on-resistance are investigated, and the relative non-idealities are modeled. With the behavioral model, SIMULINK simulations were performed to analyze the non-ideal error sources and their influences on the performance of THA. Based on the simulated results, a prototype chip was designed and fabricated using GaAs HBT technology. The validity of the proposed THA model has been verified by comparing the simulated behavior with the results from the fabricated sample.