A CMOS Current Steering Neurostimulation Array With Integrated DAC Calibration and Charge Balancing. - Elliot Greenwald; Christoph Maier; Qihong Wang; Robert Beaulieu; Ralph Etienne-Cummings; Gert Cauwenberghs; Nitish V. Thakor (IEEE Trans. Biomed. Circuits Syst., 2017)