Neural Recording System with 8 Channel Neural Amplifier and Logarithmic ADC

This work proposes a low-power 8 channel neural recording system for use in advanced closed-loop neurostimulation applications for the detection and treatment of neurological disorders such as Parkinson’s disease. The analog front end senses and filters the neural activity with eight low-noise preamplifiers and band-pass filters. The neural sensing signals are multiplexed to a single logarithmic pipelined ADC. Separation of the low frequency local field potentials (LFPs) from the high frequency neural spikes is done using on-chip finite impulse response (FIR) digital filters.The resulting signals can then be used to dynamically control the neurostimulation parameters in a closed-loop system to alleviate the neurological symptoms of the disease. Keywords—Neural recording, neurostimulation, logarithmic pipelined ADC, finite impulse response.