Research

Home Research Team Openings

Current Projects

Project: High-Speed ADC Design and Calibration for Wireline Communicaiton

More details to be added.

Project: Energy Efficient PLL for High-Speed Digital Communication

More details to be added.

Project: Wideband Data Converters for 5G/6G Wireless Communication

More details to be added.

Project: Electronic Neural Interfaces for Closed-loop Neuromodulation

More details to be added.

Recent Journals

G. Boudreault-Morales, C. Marquez-Chin, X. Liu, and Jose Zariffa, "The Effect of Depth Data and Upper Limb Impairment on Lightweight Monocular RGB Human Pose Estimation Models", BioMedical Engineer-ing OnLine, Jan 2025.
R. Yang, Y. Hou, S. Blade, Y. Li, V. Tyagi, G. Boudreault-Morales, J. Zariffa, and X. Liu, "A Multi-Modal System Featuring Wireless Flexible Sensor Patches and a Depth-Sensing Imager for Home-Based Moni-toring of Rehabilitation Exercises", IEEE Integrated Circuits and Systems (ICAS), vol. 1, no. 4, pp. 227-238, Dec. 2024.
S. Iwasa, X. Liu, H. Naguib, S. Kalia, M. Popovic, and C. Morshead, "Electrical Stimulation for Stem Cell-Based Neural Repair: Zapping the Field to Action", eNeuro, pp. 0183-24, Sept. 2024.
Y. Hou, Y. Zhu, J. Ji, A. G. Richardson, X. Liu, "A Wireless Sensor-Brain Interface System for Tracking and Guiding Animal Behaviors Through Closed-loop Neuromodulation in Water Mazes", IEEE Journal of Solid-State Circuits (JSSC), vol. 59, no. 4, Apr. 2024.
J. Xu, J. Filho, S. Nag, L. Long, E. Hwang, C. Tejeiro, G. O'Leary, Y. Huang, M. Kanchwala, M. Abdolrazzaghi, C. Tang, P. Liu, Y. Sui, H. You, X. Liu, J. Zariffa, R. Genov, "Fascicle-Selective Ultrasound-Powered Bidirectional Wireless Peripheral Nerve Interface IC," IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), vol. 17, no. 6, pp. 1237-1256, Dec. 2023.
Y. Hou, J. Ji, Y. Zhu, T. Dell, and X. Liu, "Flexible Gel-Free Multi-Modal Wireless Sensors with Edge Deep Learning for Detecting and Alerting Freezing of Gait Symptom," IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), vol. 17, no. 5, Oct. 2023.
H. Jafari, X. Liu, and R. Genov, "Synergistic Distributed Thermal Regulation for On-CMOS High-Throughput Multi-Modal Amperometric DNA-Array Analysis," IEEE Open Journal of Solid-State Circuits Society (OJ-SSCS), vol.3 pp. 89-102, Jan 2023.
N. Soltani, ..., X. Liu, and R. Genov, "A 21.3%-Efficiency Clipped-Sinusoid UWB Impulse Radio Transmitter with Simultaneous Inductive Powering and Data Receiving", IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), vol. 16, no. 6, pp. 1228-1238, Nov. 2022.
Y. Ma, ... , X. Liu, and J. Van der Spiegel, "A Review of Electrochemical Electrodes and Readout Interface Designs for Biosensors", IEEE Open Journal of Solid-State Circuits Society (OJ-SSCS), vol. 3, pp. 76-88, Nov. 2022.
X. Liu, A. G. Richardson, "Edge deep learning for neural implants: a case study of seizure detection and prediction," Journal of Neural Engineering, vol. 18, no. 4, pp. 046034, Apr. 2021.
X. Liu, A. G. Richardson, and J. Van der Spiegel, "An Energy-efficient Compressed Sensing Based Encryption Scheme for Wireless Neural Recording", IEEE Journal on Emerging and Selected Topics in Circuits and Systems (JETCAS), vol. 11, no. 2, pp. 405-411, Apr. 2021.
M. Zhang, Z. Tang, X. Liu, J. Van der Spiegel, "Electronic Neural Interfaces," Nature Electronics, vol. 3, pp. 191–200, Mar. 2020.
X. Liu, H. Zhu, T. Qiu, S. Y. Sritharan, D. Ge, S. Yang, M. Zhang, A. G. Richardson, T. H. Lucas, N. Engheta, and J. Van der Spiegel, "A Fully Integrated Sensor-Brain-Machine Interface System for Restoring Somatosensation," IEEE Sensors Journal, vol. 21, no. 4, Oct. 2020.

Recent Conferences

Y. Huang, B. Liu, Y. Hou, J. Xu, H. You, A. Hung, S. Ghosh, E. Liu, N. Yang, J. Ma, H. Cai, L. Kon-drataviciute, Q. Deng, S. K. Kalia, A. G. Richardson, P. Hsieh, R. Genov, and X. Liu, "A Neuroprosthetic SoC with Sensory Feedback Featuring Frequency-Splitting-Based Wireless Power Transfer with 200Mb/s 0.67pJ/b Backscatter Data Uplink and Unsupervised Multi-Class Spike Sorting," Interna-tional Solid-State Circuits Conference (ISSCC), Feb. 2025.
R. Yang, Y. Hou, S. Blade, Y. Li, V. Tyagi, G. Boudreault-Morales, S. Zhou, J. Zariffa, and X. Liu, "A Multi-Modal System with Wireless Flexible Sensor Patches and a Depth-Sensing Imager for At-Home Monitoring of Rehabilitation Exercises", IEEE Biomedical Circuits and Systems Conference (BioCAS), Oct. 2024.
R. Tang, H. Wang, B. Almeida, and X. Liu, "A Wearable High-Voltage Functional Electrical Stimulator with Sub-20~ns Switching Time for Stimulation with Reduced Pain", IEEE Biomedical Circuits and Sys-tems Conference (BioCAS), Oct. 2024.
J. S. Filho, H. Kassiri, X. Liu, and R. Genov, "Artificially Intelligent Closed-Loop Neurostimulators: Trade-offs Between Local and Remote Computing," IEEE Custom Integrated Circuits Conference (CICC), Apr. 2024.
Y. Hou, Y. Zhu, X. Wu, Y. Li, T. H. Lucas, A. G. Richardson, and X. Liu, "A Multi-Loop Neuromodulation Chipset Network with Frequency-Interleaving Front-End and Explainable AI for Memory Studies in Freely Behaving Monkeys," International Solid-State Circuits Conference (ISSCC), Feb. 2024.
S. Blade, Z. Yao, Y. Hou, Y. Li, S. Zhou, Y. Wang, and X. Liu, "An sEMG-Controlled Prosthetic Hand Featuring a Tiny CNN-Transformer Model and Force Feedback", IEEE Biomedical Circuits and Systems Conference (BioCAS), Oct. 2023.
Y. Zhu, Y. Hou, J. Ji, A. Zhou, A. G. Richardson, and X. Liu, "A Wireless Sensor-Brain Interface System for Tracking and Guiding Animal Behaviors Through Goal-Directed Closed-loop Neuromodulation", IEEE Symposium on VLSI Technology and Circuits (VLSI), Kyoto, Japan, Jun. 2023.
V. Kang, A. Malak, K. Lau, Y. Zhu, C. Morshead, and X. Liu, "A 0.9 g Battery-Free Wireless Stimulator with Infrared Communication for Applications in Neural Repair and Regeneration", IEEE International Symposium on Circuits and Systems (ISCAS), Monterey, CA, USA, May 2023.
M. Sun, A. Zhou, N. Yang, Y. Xu, Y. Hou, A.G. Richardson, and X. Liu, "Design of a Sleep Modulation System with FPGA-Accelerated Deep Learning for Closed-Loop Stage-Specific In-Phase Auditory Stimulation", IEEE International Symposium on Circuits and Systems (ISCAS), Monterey, CA, USA, May 2023.
M. Wagih Ismail, X. Liu, and T. Chan Carusone, "Inductorless Bandpass Noise-Shaping Continuous-Time Pipelined ADC Architectures", IEEE International Symposium on Circuits and Systems (ISCAS), Monterey, CA, USA, May 2023.
T. Yu, B. Cui, Y. Xu, and X. Liu, "Refine EEG Spectrogram Synthesized by Generative Adversarial Network For Improving the Prediction of Epileptic Seizures", IEEE International EMBS Conference on Neural Engineering (NER), 2023.
Z. Yao, and X. Liu, "A CNN-Transformer Deep Learning Model for Real-time Sleep Stage Classification in an Energy-Constrained Wireless Device", IEEE International EMBS Conference on Neural Engineering (NER), 2023.
O. Lin, T. Yu, Y. Hou, Y. Zhu, and X. Liu, "Wireless Sensors with Edge Deep Learning for Detecting and Alerting Freezing of Gait Symptoms in Parkinson's Pastients", IEEE International EMBS Conference on Neural Engineering (NER), 2023.
J. Xu, et al., "Fascicle-Selective Bidirectional Peripheral Nerve Interface IC with 173dB FOM Noise-Shaping SAR ADCs and 1.38 pJ/bit Frequency-Multiplying Current-Ripple Radio Transmitter", International Solid-State Circuits Conference (ISSCC), 2023.
Z. Chen, H. Wang, C. Yeh, and X. Liu, "Classify Respiratory Abnormality in Lung Sounds Using STFT and a Fine-Tuned ResNet18 Network," IEEE Biomedical Circuits and Systems Conference (BioCAS), Oct. 2022.
X. Liu, and A. G. Richardson, "A System-on-Chip for Closed-loop Optogenetic Sleep Modulation," International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Nov. 2021.
P. Unegbu, X. Liu, and F. Vitale, "Design and Testing of a Closed-Loop Neurochemical Modulator," Abstract, International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Nov. 2021.