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This paper presents an ultra-low power and small area analog front-end for an implantable multichannel neural signal recording and stimulation interface, to be used in wirelessly powered implantable Brain-Machine Interfaces. For a given functionality and performance, area, power, and noise-response are the three critical parameters that define the suitability of a design for implantation. The three main components of a typical neural implant are the analog front-end, the digital processor, and the wireless data and power transceiver. Among them, neural front-end is the most power and area hungry module. This paper presents an 8-channel analog front-end prototype for simultaneous recording and stimulation, employing a novel architecture which significantly improves power and area consumption of the chip over current state of the art. In contrast to published architectures, the multichannel recording path is centered on a …