A 10-GHz SiGe BiCMOS phase-locked-loop frequency synthesizer. - Bernd-Ulrich H. Klepser; Markus Scholz; Edmund Götz (IEEE J. Solid State Circuits, 2002)

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)