Title :
A high-impedance microelectrode driver dedicated for visual intracortical microstimulation
Author :
Hasanuzzaman, Md ; Raut, Rabin ; Sawan, Mohamad
Author_Institution :
Polystim Neurotechnologies Lab., Polytech. Montreal, Montreal, QC, Canada
Abstract :
We present in this paper a high-impedance microelectrode driver dedicated for visual intracortical microstimulation. This highly-configurable output stage is able to deliver eight bipolar or sixteen monopolar stimulation simultaneously with a constant current amplitude. The maximum stimulation current is set to 100μA which reaches 98??A through a 100kΩ impedance in the post-layout simulation results. The system is designed in DALSA 0.8μm 5V/20V CMOS/DMOS technology to meet the high-voltage compliance across electrode-tissue interface impedance. The driver circuit features a new on-chip 32-bit serial-in parallel-out shift register along with the new forbidden state logic circuits for generating the control signals for the switch matrix. The quiescent power consumption of the system is 316μW. Voltage compliance of 10V across the resistor of 100kΩ has been achieved for ±10V supplies.
Keywords :
CMOS integrated circuits; biological tissues; biomedical electronics; circuit layout; circuit simulation; driver circuits; logic circuits; microelectrodes; shift registers; DALSA CMOS-DMOS technology; bipolar stimulation; current 100 muA; current 98 muA; driver circuit; electrode-tissue interface impedance; forbidden state logic circuit; high-impedance microelectrode driver; high-voltage compliance; monopolar stimulation; on-chip serial-in parallel-out shift register; post-layout simulation result; power 316 muW; quiescent power consumption; resistance 100 kohm; size 0.8 mum; switch matrix; visual intracortical microstimulation; voltage 10 V; voltage 20 V; voltage 5 V; word length 32 bit; Impedance; Microelectrodes; Registers; Switches; Transistors;
Conference_Titel :
Circuits and Systems (MWSCAS), 2012 IEEE 55th International Midwest Symposium on
Conference_Location :
Boise, ID
Print_ISBN :
978-1-4673-2526-4
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2012.6291997
