Abstract
This paper reports a 128-channel neural recording integrated circuit (IC) with on-the-fly spike feature extraction and wireless telemetry. The chip consists of eight 16-channel front-end recording blocks, spike detection and feature extraction digital signal processor (DSP), ultra wideband (UWB) transmitter, and on-chip bias generators. Each recording channel has amplifiers with programmable gain and bandwidth to accommodate different types of biological signals. An analog-to-digital converter (ADC) shared by 16 amplifiers through time-multiplexing results in a balanced trade-off between the power consumption and chip area. A nonlinear energy operator (NEO) based spike detector is implemented for identifying spikes, which are further processed by a digital frequency-shaping filter. The computationally efficient spike detection and feature extraction algorithms attribute to an auspicious DSP implementation on-chip. UWB telemetry is designed to wirelessly transfer raw data from 128 recording channels at a data rate of 90 Mbit/s. The chip is realized in 0.35 μmu complementary metal-oxide-semiconductor (CMOS) process with an area of 8.8 × 7.2 mm2 and consumes 6 mW by employing a sequential turn-on architecture that selectively powers off idle analog circuit blocks. The chip has been tested for electrical specifications and verified in an ex vivo biological environment.
Original language | English |
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Pages (from-to) | 312-321 |
Number of pages | 10 |
Journal | IEEE Transactions on Neural Systems and Rehabilitation Engineering |
Volume | 17 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2009 Aug |
All Science Journal Classification (ASJC) codes
- Internal Medicine
- General Neuroscience
- Biomedical Engineering
- Rehabilitation