Switch-Less Frequency-Domain Multiplexing of GFET Sensors and Low-Power CMOS Frontend for 1024-Channel μECoG

This paper presents a novel frequency-domain multiplexing scheme of liquid-gate GFET sensors for large-scale μECoG recording. The proposed technique allows the hybrid integration of GFET arrays and read-out ICs. In order to avoid artifacts, the proposal does not employ any switch in the GFET array and it is insensitive to the flicker noise of the CMOS frontend. A modular read-out IC architecture targeting the continuous acquisition of up to 1024 μECoG channels is introduced together with a collection of low-power CMOS circuits for the practical implementation of each building block. A test chip of the proposed system is currently being integrated in 0.18-μm 6-metal CMOS technology.