In our research project, we develop an ultra high-speed and broadband Digital-to-Analog Converter (DAC) in ST 28 nm CMOS FD-SOI technology for sampling rates up to 128 GS/s and 8 bit nominal resolution. The converter is developed for optical communication systems as well as for application in experimental setups as arbitrary waveform generator (AWG). The circuit is a DAC for sampling rates up to 128 GS/s and 8 bit nominal resolution. In combination with 256 kByte on-chip memory, a single-chip AWG is realized. New static CMOS based circuit topologies are implemented on this chip to achieve highest sampling rates and bandwidths for CMOS DACs while keeping power consumption low. Finally, the whole circuit including the on-chip memory is a full-custom design with the drawn dimensions 1.88 mm x 1.88 mm (seal ring excluded) and comprises more than 40 million transistors. This project is funded by Deutsche Forschungsgemeinschaft (DFG).