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Noise-shaping SAR ADC using three capacitors

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4 Author(s)
Chen, C.-H. ; Sch. of Electr. Eng. & Comput. Sci., Oregon State Univ., Corvallis, OR, USA ; Zhang, Y. ; Ceballos, J.L. ; Temes, G.C.

A simple and highly efficient successive-approximation registers (SAR) ADC realisation is proposed. It requires an opamp, a comparator and only three equal-valued capacitors. The proposed scheme is insensitive to the capacitor parasitics, and has a small capacitance spread. With an oversampled scheme, it also allows noise-shaping the remaining quantisation error. It is well-suited for low-frequency instrumentation and measurement applications, and for use in extended-counting ADCs.

Published in:

Electronics Letters  (Volume:49 ,  Issue: 3 )