Programmable gain and de level shift analog signal conditioning circuit: Microcontroller based implementation

Abstract

Programmable analog conditioning circuits are very important for instrumentation systems since the same circuit can be used for different type of sensors. The main functions that must be provided for the analog conditioning circuit are gain and dc level shift. The conditioning circuit must be optimized, especially for systems on chip, in order to use reduced number of components, area and costs. In this work, we propose an architecture for a programmable gain and dc level shift circuit based on a procedure that yields the smallest set of passive components while guaranteeing the design specified performance in terms of maximum loss of resolution and no measurement range loss