Uncertainty and sensitivity analysis applied to a voltage series operational amplifier

Abstract

This paper investigates the applied uncertainty and sensitivity analysis to resistors used in a voltage series operational amplifier circuit. Two types of resistor bands are considered, namely the gold band (5% tolerance) and the silver band (10% tolerance). To generate resistors uncertainty sample points, the SIMLAB uncertainty and sensitivity tool is used. A total of 6,144 sample points based on Sobol’ technique has been created for each resistor band. The voltage series amplifier is modelled in MATLAB/Simulink. A MATLAB script has been written to execute Monte-Carlo simulations to read the resistor sample points, updating and executing the voltage series model and finally calculating the voltage gain. The result of uncertainty analysis shows that the produced voltage gain is uncertain within the range of ±1 for the gold band and ±2 for the silver band with respect to a target voltage gain. The result of the sensitivity analysis shows that each resistor, although their values are different, contributes equally to the uncertainty of the voltage gain.