A quad-band low power single chip direct conversion CMOS transceiver with ΣΔ-modulation loop for GSM. - Edmund Götz; Hans Krobel; Gunter Marzinger; Bernd Memmler; Christian Muenker; Burkhard Neurauter; Dirk Romer; Jorn Rubach; Werner Schelmbauer; Markus Scholz; Martin Simon; Ulrich Steinacker; et al. (ESSCIRC, 2003)

13.2 A digital multimode polar transmitter supporting 40MHz LTE Carrier Aggregation in 28nm CMOS. - Michael Fulde; Alexander Belitzer; Zdravko Boos; Michael Bruennert; Jonas Fritzin; Hans Geltinger; Marcus Groinig; Daniel Gruber; Simon Gruenberger; Thomas Hartig; Vahur Kampus; Boris Kapfelsperger; et al. (ISSCC, 2017)