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Safety Ensuring Retinal Prosthesis With Precise Charge Balance and Low Power Consumption

Abstract—Ensuring safe operation of stimulators is the most important issue in neural stimulation. Safety, in terms of stimulators’ electrical performances, can be related mainly to two factors; the
zero-net charge transfer to tissue and the heat generated by power dissipation at tissue. This paper presents a safety ensuring neurostimulator for retinal vision prostheses, featuring precise charge
balancing capability and low power consumption, using a 0.35 m HV (high voltage) CMOS process. Also, the required matching accuracy of the biphasic current pulse for safe stimulation is mathematically
derived. Accurate charge balance is achieved by employing a dynamic current mirror at the output of a stimulator. In experiments, using a simple electrode model (a resistor (R) and a capacitor (C) in parallel), the proposed stimulator ensures less than 30 nA DC current flowing into tissue over all stimulation current ranges (32 A–1 mA), without shorting. With shorting enabled, further reduction is achieved down to 1.5 nA. Low power consumption was achieved by utilising small bias current, sharing of key biasing blocks, and utilising a short duty cycle for stimulation. Less than 30 W was consumed during stand-by mode, mostly by bias circuitry.
Index Terms—Charge balanced biphasic current pulse, low power consumption, neuro-stimulator, retinal stimulator, stimulator, vision prosthesis.

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Informasi Detail
Judul Seri
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEM
No. Panggil
-
Penerbit
New York : IEEE.,
Deskripsi Fisik
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS, VOL. 8, NO. 1, FEBRUARY 2014
Bahasa
English
ISBN/ISSN
-
Klasifikasi
-
Tipe Isi
-
Tipe Media
-
Tipe Pembawa
-
Edisi
VOL. 8, NO. 1
Subjek
TEKNIK
Info Detail Spesifik
-
Pernyataan Tanggungjawab
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