An implantable neuro-stimulator device for a retinal prosthesis

“…Growing concerns for human health have stimulated the development of biomedical devices [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ], such as biosensors for recording neural spikes, field potentials, electroencephalography (EEG), electrocardiography (ECG), electromyography (EMG), and so on. Figure 1 shows the block diagram in a wireless neural recording microsystem [ 1 ], where an analog-to-digital converter (ADC) is used for digitizing neural data recorded at each electrode.…”

Section: Introductionmentioning

confidence: 99%

A High Performance Delta-Sigma Modulator for Neurosensing

Zhao

et al. 2015

Sensors

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Recorded neural data are frequently corrupted by large amplitude artifacts that are triggered by a variety of sources, such as subject movements, organ motions, electromagnetic interferences and discharges at the electrode surface. To prevent the system from saturating and the electronics from malfunctioning due to these large artifacts, a wide dynamic range for data acquisition is demanded, which is quite challenging to achieve and would require excessive circuit area and power for implementation. In this paper, we present a high performance Delta-Sigma modulator along with several design techniques and enabling blocks to reduce circuit area and power. The modulator was fabricated in a 0.18-μm CMOS process. Powered by a 1.0-V supply, the chip can achieve an 85-dB peak signal-to-noise-and-distortion ratio (SNDR) and an 87-dB dynamic range when integrated over a 10-kHz bandwidth. The total power consumption of the modulator is 13 μW, which corresponds to a figure-of-merit (FOM) of 45 fJ/conversion step. These competitive circuit specifications make this design a good candidate for building high precision neurosensors.

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“…Electrical activation can restore the deprived motor/sensory functions as long as the peripheral motor and/sensory nerves and muscle below the level of CNS lesion remain intact (Stein et al, 1992). Various types of electrical stimulation techniques have made it possible to restore some motor and sensory functions (Bhadra et al, 2001;Clements et al, 1999;Davis et al, 2001;Loeb et al, 2001).…”

Section: Introductionmentioning

confidence: 99%