Custódio, J. R., J. Goes, and et al. "A 1.2-V 165-uW 0.29-mm2 Multi-Bit Sigma-Delta ADC for Hearing Aids using Nonlinear DACs and with over 91 dB Dynamic-Range." IEEE Transactions on Biomedical Circuits and Systems (TBCAS). vol. 7.no. 3 (2013): pp. 376-385.