An efficient micro-stimulator array using unitary-size DAC with adiabatic baseband scheme

This paper presents novel approaches for higher-resolution, higher output gain, better-linearity, and less-power-consumption micro-stimulator array. To achieve higher output gain for more ideal stimulus current without extra cascode stage, a gain-boosting design is adopted. To achieve higher-resolution and better linearity, a continuous pulse-width modulation-based conversion architecture has been proposed. To overcome extra power consumption of the baseband control logic, the energy recovery scheme is also applied. A monolithic circuitry of this efficient stimulator array has been realized by using TSMC 0.18-μm 1P6M standard CMOS technology and the experimental results show improvement over the prior approaches.