Programação de ganho e deslocamento de nível cc para condicionamento de sinais de medição: Implementação com componentes discretos usando microcontrolador

Abstract

Analog, digital and mixed circuits allow their utilization in several different applications. In instrumentation, in order to measure several quantities using different sensors, the conditioning circuit must be programmable to yield different gain and dc level shift values in order to use the maximum A/D converter input span without causing saturation. A procedure for defining and applying the gain an dc level shift values that guarantees the full measurement range with loss of resolution within acceptable limits, taking into consideration implementation practical aspects, like passive components values, is presented in this work. Architecture for implementing this circuit that support both differential and single-end modes of operation is proposed.