Resumo

SCHMIDT, C et al. Post-compensation of a CT first-order ΣΔ ADC using PWL dynamic system. Lat. Am. appl. res. [online]. 2013, vol.43, n.3, pp.287-293. ISSN 0327-0793.

An approach for compensating non-linearities 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 spurious free dynamic range for multi-tone inputs

Palavras-chave : Analog to Digital Converters; Nonlinearities; PWL Models; Compensation.

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