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We present a 64-channel implantable neural stimulator with sub-nC charge-balanced current stimulation for seizure suppression applications. The regulated cascode current driver achieves almost full VDD compliance voltage range with 98% supply voltage utilization (4.9V from 5V) in standard 0.18 µm CMOS technology, eliminating the need for expensive high-voltage processes. A passive charge balancing scheme using a bootstrapped switch with reduced on-resistance (19.56 Ω) maintains residual charge levels below 1 nC, well within the 15 nC safe limits, enabling reliable long-term operation. The stimulation parameters, including current pulse width (1 µs-1023 µs), channel activation, stimulation frequency, and current amplitude (1 µA to 1.8 mA), are highly reconfigurable through a 10 MHz SPI interface, enabling real-time adaptive stimulation protocols. The hierarchical 8 + 3-bit DAC architecture provides superior current resolution compared to existing single DAC systems while maintaining compact area efficiency of 0.0125 mm2 per channel. In-vivo animal experiments demonstrate effective seizure suppression, achieving seizure reduction within 14 seconds after 40 seconds of 5 Hz stimulation at 50 µA amplitude, validating the therapeutic efficacy of the proposed system. The fabricated IC in 0.18 µm standard CMOS process successfully combines high channel count, optimal compliance voltage utilization, enhanced safety margins, and in-vivo validation, making it suitable for practical implantable epilepsy treatment applications.

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Precision matching optimization of optical metrology and inspection equipment for yield enhancement in semiconductor manufacturing Hyoseop Shin, Hojun Lee, Dongkun Shin p. 623-632
(An) error-aware 4-2 compressor design for balanced accuracy and efficiency in approximate multipliers Dongju Kim, Yongtae Kim p. 633-644
Real-time TSV 3D shape defect inspection system using deep learning based fast object detection Kyeong Beom Park, Jae Yeol Lee, Harim Lee p. 645-653
Coplanar waveguide sensor for dimethyl methyl phosphonate (DMMP) vapor detection at microwave frequencies Zabdiel Brito-Brito, Jorge A.I. Araujo, Sung-min Sim, Marcos T. de Melo, Ignacio Llamas-Garro, Jung-Mu Kim p. 654-661
Hardware-software co-design for vector similarity search on HBM-PIM Nahyeon Kim, Sujin Kim, Min Jung, Haechannuri Noh, Ji-Hoon Kim p. 662-669
(A) 64-channel high-compliance neural stimulator IC in standard CMOS with sub-1nC charge balancing for seizure suppression Seokbeom Cheon, Seungah Lee, Byeongseol Kim, Joonsung Bae p. 670-678
(An) area-efficient two-step vernier time-to-digital converter with a metastability-free phase detector for NAND flash memory interfaces Dong-Ho Shin, Jun-Ha Lee, Kang Yoon Lee p. 679-687
Energy efficient CMOS stochastic bit-based Bayesian inference accelerator Honggu Kim, Yong Shim p. 688-695
Enhanced methane gas sensors utilizing lithium-ion decorated SWCNTs networks Da-Gyo Yoo, Kyung Eun Kim, Ryang Ha Kim, Beom Joon Jung, Jae Hyeon Kim, Young Lae Kim, Myung-Hyun Baek p. 696-702
Room temperature hydrogen gas sensor based on Pd-SnO2 nanomaterials with electro-spinning Dongjun Jang, Sangwan Kim, Min-Woo Kwon p. 703-710
(A) 1.12-ps resolution flash ADC-assisted coarse-to-fine time-to-digital converter with adaptive reference-voltage calibration and digital linearity correction Solmon Shin, Hyunwoo Son, Youngsik Kim, Shinwoong Kim p. 711-720
Deep learning driven modeling of advanced node FinFET Sehtab Hossain p. 721-729
(An) FVF-based capacitorless LDO with segmented power cells achieving fast transient response, wideband high PSR, and wide load current range Doojin Jang p. 730-735

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