Post-compensation of a CT First-order Sigma-Delta ADC Using PWL Dynamic Systems

CHRISTIAN SCHMIDT; JUAN EDMUNDO COUSSEAU; JOSE LUIS FIGUEROA; RISTRO WICHMAN; STEFAN WERNER

Paraná

Workshop; XIV Reunión de trabajo en Procesamiento de la Información y Control; 2011

Universidad Nacional de Entre Rios

An approach for compensating nonlinearities in a continuous-time first-order sigma-delta converter with one bit quantization is presented. The proposed compensators are parallel nonlinear dynamic systems using piecewise linear static functions. A reduction of an order of magnitude is obtained in the measured squared error when compared to the uncompensated sigma-delta converter. Our results confirm a significant improvement in signal to noise and distortion ratio for single tone input signals and in spurius free dynamic range for multi-tone inputs.