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Design optimization of integer lifting DWT circuitry for implantable neuroprosthetics

Neuroprosthetics can benefit greatly from area and power efficient signal processing circuitry suitable for implanting alongside miniature neural probes that interface to the nervous system. This work identifies an optimal VLSI architecture for computing a 1-dimensional multilevel discrete wavelet transform for multiple electrode channels simultaneously. The architecture is based on the lifting-scheme for wavelet computation and integer fixed-point precision for real-time processing under constraints imposed by implantability requirements. Two different computational node designs have been explored and compared to identify an optimal approach that minimizes power and chip area for a given number of levels and channels. Results demonstrate that on-chip computation is feasible prior to data transmission.