A 2.4GHz-bandwidth OEIC with voltage-up-converter [optical receiver]. - Robert Swoboda; Johannes Knorr; Horst Zimmermann (ESSCIRC, 2004)

Sensitivity-enhanced OEIC with capacitance multiplier for reduced lower-cutoff frequency. - Jürgen Leeb; Johannes Knorr; Horst Zimmermann (ISCAS (1), 2004)

A 5-Gb/s OEIC with voltage-up-converter. - Robert Swoboda; Johannes Knorr; Horst Zimmermann (IEEE J. Solid State Circuits, 2005)

A 2.5-Gb/s Receiver PDIC With Low-Noise Integrated Charge Pump. - Robert Swoboda; Johannes Knorr; Horst Zimmermann (IEEE Trans. Circuits Syst. II Express Briefs, 2006)