This paper presents a power- and area-efficient spike sorting processor (SSP) for real-time neural recordings. The proposed SSP includes novel detection, feature extraction, and improved K-means algorithms for better clustering accuracy, online clustering performance, and lower power and smaller area per channel. Time-multiplexed registers are utilized in the detector for dynamic power reduction. Finally, an ultralowvoltage 8T static random access memory (SRAM) is developed to reduce area and leakage consumption when compared to D flip-flop-based memory. The proposed SSP, fabricated in 65-nm CMOS process technology, consumes only 0.175 µW/channel when processing 128 input channels at 3.2 MHz and 0.54 V, which is the lowest among the compared state-of-the-art SSPs. The proposed SSP also occupies 0.003 mm2/channel, which allows 333 channels/mm2.
Less Number of array counters with multistage implementation.