Open AccessNoise‐shaping SAR ADC using three capacitors
Author(s) -
Chen C.H.,
Zhang Y.,
Ceballos J.L.,
Temes G.C.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2012.4204
Subject(s) - capacitor , comparator , successive approximation adc , electronic engineering , parasitic extraction , noise (video) , capacitance , computer science , noise shaping , operational amplifier , electrical engineering , engineering , physics , voltage , amplifier , cmos , artificial intelligence , image (mathematics) , electrode , quantum mechanics
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.