A retina stimulator ASIC with 232 electrodes, custom ESD protection and active charge balancing. - Maurits Ortmanns; N. Unger; André Rocke; Marcus Gehrke; Hans-Jürgen Tiedtke (ISCAS, 2006)

A 0.1mm2, Digitally Programmable Nerve Stimulation Pad Cell with High-Voltage Capability for a Retinal Implant. - Maurits Ortmanns; N. Unger; André Rocke; Marcus Gehrke; H. J. Tietdke (ISSCC, 2006)

A 232-Channel Visual Prosthesis ASIC with Production-Compliant Safety and Testability. - Maurits Ortmanns; N. Linger; André Rocke; S. Rackow; Marcus Gehrke; Hans-Jürgen Tiedtke (ISSCC, 2007)

A 232-Channel Epiretinal Stimulator ASIC. - Maurits Ortmanns; André Rocke; Marcus Gehrke; Hans-Jürgen Tiedtke (IEEE J. Solid State Circuits, 2007)