Title :
Capacitive-data links, energy-efficient and high-voltage compliant visual intracortical microstimulation system
Author :
Hasanuzzaman, Md ; Simard, G. ; Krouchev, Nedialko I. ; Raut, Rahul ; Sawan, Mohamad
Author_Institution :
Polystim Neurotechnologies Lab., Polytech. Montreal, Montreal, QC, Canada
Abstract :
We present in this paper a new architecture of a visual intracortical microstimulator, which is composed of an external controller providing electromagnetic energy and capacitive-link based high data rate link, and a multi-unit energy-efficient implant. The latter is composed of 2 full custom chips. The first one is a multiwaveform stimuli generator dedicated to supply microstimulation-based constant current to the second chip grouping a multichannel high-impedance microelectrode driver (MED). The stimuli generator is featured with several new power-efficient building blocks such as high-performance current mirrors, low-area source/sink current-mode digital-to-analog converters (DACs), and low-power dedicated controller. The highly-configurable MED, which provides the multi-level current (2 to 196 μA), drives an array of microelectrodes through high-voltage switches. The stimuli generator is implemented in 1.2/3.3 V IBM CMOS 0.13 μm technology. However the output MED is fabricated in DALSA 0.8 μm 5V/20V CMOS/DMOS technology. The latter supplies needed compliance voltage of 10V across high impedance (average value of 100kΩ) microelectrode-tissue interface. The silicon areas of the low-voltage and high-voltage chips are 1.75×1.75 mm2 and 4.0×4.0 mm2 respectively. Post-layout simulation results are provided to show the expected operation of the device.
Keywords :
CMOS integrated circuits; biomedical electrodes; biomedical electronics; eye; microelectrodes; prosthetics; visual evoked potentials; CMOS-DMOS technology; DAC; DALSA; IBM CMOS; capacitive-data link; compliance voltage; current 2 muA to 196 muA; digital-to-analog converter; electromagnetic energy; energy efficient compliant visual intracortical microstimulation system; expected device operation; external controller; full custom chip; high data rate link; high impedance microelectrode-tissue interface; high performance current mirror; high voltage chip silicon area; high voltage compliant visual intracortical microstimulation system; high voltage switch; low power dedicated controller; low voltage chip silicon area; microelectrode array; microstimulation-based constant current; multichannel high impedance microelectrode driver; multilevel current; multiunit energy efficient implant; multiwaveform stimuli generator; output MED; post layout simulation; power efficient building block; size 0.13 mum; size 0.8 mum; size 1.75 mm; size 4.0 mm; visual intracortical microstimulator architecture; voltage 1.2 V; voltage 10 V; voltage 20 V; voltage 3.3 V; voltage 5 V; CMOS integrated circuits; Capacitors; Generators; Impedance; Microelectrodes; Mirrors; Visualization;
Conference_Titel :
Circuits and Systems (ISCAS), 2013 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-5760-9
DOI :
10.1109/ISCAS.2013.6571925
