A very area/power efficient mixed signal circuit for voice signal processing in 0.18 digital technology. - João Risques; Jorge Duarte; Vasco Amaro; Seng-Pan U; Kuok Vai Chiang; Ka Fai Chang; Keng Chong Lai (ESSCIRC, 2003)

Fully Integrated Headphone Detector. - David Guilherme; Nuno V. Caldeira; João Risques (ICECS, 2006)