Multi-bit sigma-delta modulators with enhanced dynamic-range using non-linear DAC for hearing aids. - José Rui Custódio; Nuno Paulino 002; João Goes; Erik Bruun (ICECS, 2008)

A CMOS Inverter-Based Self-biased Fully Differential Amplifier. - José Rui Custódio; Michael Figueiredo; Edinei Santin; João Goes (DoCEIS, 2010)

MOSFET-only Mixer/IIR filter with gain using parametric amplification. - José Rui Custódio; João Pedro Oliveira 003; Luís B. Oliveira; João Goes; Erik Bruun (ISCAS, 2010)

A 1.2-V 165-µ W 0.29-mm2 Multibit Sigma-Delta ADC for Hearing Aids Using Nonlinear DACs and With Over 91 dB Dynamic-Range. - José Rui Custódio; João Goes; Nuno Paulino 002; João Pedro Oliveira 003; Erik Bruun (IEEE Trans. Biomed. Circuits Syst., 2013)