TY - GEN
T1 - An Energy-Efficient, Scalable Neural Stimulation IC with Adaptive Dynamic Voltage Switching for Cochlear Implant System
AU - Ahn, Woojin
AU - Nguyen, Kim Hoang
AU - Lim, Jungwoo
AU - Min, Kyou Sik
AU - Lee, Hoseung
AU - Ha, Sohmyung
AU - Je, Minkyu
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - We present an energy-efficient, scalable neural stim-ulation IC with adaptive dynamic voltage switching, which can be applied to cochlear implant (CI) systems. The stimulation IC generates three different voltage outputs by operating a single-inductor multiple-output (SIMO) boost converter, while an adaptive dynamic voltage switching (ADVS) block selects an appropriate supply voltage for each stimulation channel among those SIMO outputs. The SIMO boost converter is designed to operate over a wide range of its input, which is the rectifier output of the wirelessly powered CI system. The ADVS control as well as the stimulation amplitude control are performed remotely by an external sound processor (SP) of the CI system in real time. For the ADVS operation, the compliance voltage of each stimulation channel is monitored to be used as an input signal for switching to the appropriate supply voltage for the corresponding stimulation channel. The dynamic voltage switching operation is carried out in sub-us, The stimulation IC with ADVS is implemented using a 180-nm BCD process, and its operation and performance are verified through post-layout simulations. When applying a real audio input using decoded data from a prototype SP, the proposed stimulation IC with ADVS demonstrates 36.6% energy saving compared to the conventional stimulation IC.
AB - We present an energy-efficient, scalable neural stim-ulation IC with adaptive dynamic voltage switching, which can be applied to cochlear implant (CI) systems. The stimulation IC generates three different voltage outputs by operating a single-inductor multiple-output (SIMO) boost converter, while an adaptive dynamic voltage switching (ADVS) block selects an appropriate supply voltage for each stimulation channel among those SIMO outputs. The SIMO boost converter is designed to operate over a wide range of its input, which is the rectifier output of the wirelessly powered CI system. The ADVS control as well as the stimulation amplitude control are performed remotely by an external sound processor (SP) of the CI system in real time. For the ADVS operation, the compliance voltage of each stimulation channel is monitored to be used as an input signal for switching to the appropriate supply voltage for the corresponding stimulation channel. The dynamic voltage switching operation is carried out in sub-us, The stimulation IC with ADVS is implemented using a 180-nm BCD process, and its operation and performance are verified through post-layout simulations. When applying a real audio input using decoded data from a prototype SP, the proposed stimulation IC with ADVS demonstrates 36.6% energy saving compared to the conventional stimulation IC.
KW - Cochlear implant
KW - adaptive dynamic voltage switching
KW - neural stimulation
KW - single-inductor multiple-output converter
UR - http://www.scopus.com/inward/record.url?scp=85167667176&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85167667176&partnerID=8YFLogxK
U2 - 10.1109/ISCAS46773.2023.10181719
DO - 10.1109/ISCAS46773.2023.10181719
M3 - Conference contribution
AN - SCOPUS:85167667176
T3 - Proceedings - IEEE International Symposium on Circuits and Systems
BT - ISCAS 2023 - 56th IEEE International Symposium on Circuits and Systems, Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 56th IEEE International Symposium on Circuits and Systems, ISCAS 2023
Y2 - 21 May 2023 through 25 May 2023
ER -