Adaptive Matching Transmitter With Dual-Band Antenna for Intraoral Tongue Drive System

The intraoral Tongue Drive System (iTDS) is a wireless assistive technology that detects users’ voluntary tongue gestures, and converts them to user-defined commands, enabling them to access computers and navigate powered wheelchairs. In this paper, we presented a transmitter (Tx) with adaptive matching and three bands (27, 433, and 915 MHz) to create a robust wireless link between iTDS and an external receiver (Rx) by addressing the effects of external RF interference and impedance variations of the Tx antenna in the dynamic mouth environment. The upper two Tx bands share a dual-band antenna, while the lower band drives a coil. The Tx antenna is simulated in a simplified human mouth model in HFSS as well as a real human head model. The adaptive triple-band Tx chip was fabricated in a 0.35-μm 4P2M standard CMOS process. The Tx chip and antenna have been characterized in a human subject as part of an iTDS prototype under open-and closed-mouth scenarios, which present the peak gain of −24.4 and −15.63 dBi at 433 and 915 MHz, respectively. Two adaptive matching networks for these bands compensate variations of the Tx antenna impedance via a feedback mechanism. The measured S11 tuning range of the proposed network can cover up to 60 and 75 jΩ at 433 and 915 MHz, respectively.

[1]  Maysam Ghovanloo,et al.  A Wireless Magnetoresistive Sensing System for an Intraoral Tongue-Computer Interface , 2012, IEEE Transactions on Biomedical Circuits and Systems.

[2]  Maysam Ghovanloo,et al.  Simultaneous Multimodal PC Access for People With Disabilities by Integrating Head Tracking, Speech Recognition, and Tongue Motion , 2017, IEEE Transactions on Biomedical Circuits and Systems.

[3]  G. Pfurtscheller,et al.  Brain-Computer Interfaces for Communication and Control. , 2011, Communications of the ACM.

[4]  Hans Gregory Schantz,et al.  Near-Field Technology - An Emerging RF Discipline , 2006 .

[5]  Maysam Ghovanloo,et al.  Towards a robust data link for intraoral tongue drive system using triple bands and adaptive matching , 2017, 2017 IEEE 60th International Midwest Symposium on Circuits and Systems (MWSCAS).

[6]  F. Hameau,et al.  A 2.4GHz CMOS automatic matching network design for pacemaker applications , 2009, 2009 Joint IEEE North-East Workshop on Circuits and Systems and TAISA Conference.

[7]  Maysam Ghovanloo,et al.  An Inductively Powered Scalable 32-Channel Wireless Neural Recording System-on-a-Chip for Neuroscience Applications , 2010, IEEE Transactions on Biomedical Circuits and Systems.

[8]  Maysam Ghovanloo,et al.  Tongue drive: a wireless tongue- operated means for people with severe disabilities to communicate their intentions , 2012, IEEE Communications Magazine.

[9]  Peter Sjöblom,et al.  An adaptive impedance tuning CMOS circuit for ISM 2.4-GHz band , 2005, IEEE Trans. Circuits Syst. I Regul. Pap..

[10]  Matthew Loy,et al.  ISM-Band and Short Range Device Regulatory Compliance Overview , 2005 .

[11]  Maysam Ghovanloo,et al.  Wireless Communication of Intraoral Devices and Its Optimal Frequency Selection , 2014, IEEE Transactions on Microwave Theory and Techniques.

[12]  Donghyeon Ji,et al.  A novel load insensitive RF power amplifier using a load mismatch detection and curing technique , 2013, 2013 IEEE Radio Frequency Integrated Circuits Symposium (RFIC).

[13]  Chang-Ho Lee,et al.  A 2.4-GHz CMOS Power Amplifier With an Integrated Antenna Impedance Mismatch Correction System , 2014, IEEE Journal of Solid-State Circuits.

[14]  Maysam Ghovanloo,et al.  Antennas for Intraoral Tongue Drive System at 2.4 GHz: Design, Characterization, and Comparison , 2018, IEEE Transactions on Microwave Theory and Techniques.

[15]  A. S. Morris,et al.  A New Method for Matching Network Adaptive Control , 2013, IEEE Transactions on Microwave Theory and Techniques.

[16]  Hyoungsuk Yoo,et al.  Scalp-Implantable Antenna Systems for Intracranial Pressure Monitoring , 2018, IEEE Transactions on Antennas and Propagation.

[17]  Maysam Ghovanloo,et al.  A Q-Modulation Technique for Efficient Inductive Power Transmission , 2015, IEEE Journal of Solid-State Circuits.

[18]  Maysam Ghovanloo,et al.  An Arch-Shaped Intraoral Tongue Drive System with Built-in Tongue-Computer Interfacing SoC , 2014, Sensors.

[19]  John P. Donoghue,et al.  Bridging the Brain to the World: A Perspective on Neural Interface Systems , 2008, Neuron.

[20]  Maysam Ghovanloo,et al.  Tapping into tongue motion to substitute or augment upper limbs , 2017, Defense + Security.

[21]  Daniel B. Horn,et al.  Patterns of entry and correction in large vocabulary continuous speech recognition systems , 1999, CHI '99.

[22]  Hyoungsuk Yoo,et al.  Multi-Band Antenna System for Skin Implant , 2016, IEEE Microwave and Wireless Components Letters.

[23]  A. Ahlbom.  Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields (up to 300 GHz) , 1998 .

[24]  Kathleen Philips,et al.  An Energy-Efficient Antenna Impedance Detection Using Electrical Balance for Single-Step On-Chip Tunable Matching in Wearable/Implantable Applications , 2017, IEEE Transactions on Biomedical Circuits and Systems.

[25]  Maysam Ghovanloo,et al.  Triple-Band Transmitter with a Shared Dual-Band Antenna and Adaptive Matching for an Intraoral Tongue Drive System , 2018, 2018 IEEE International Symposium on Circuits and Systems (ISCAS).

[26]  Maysam Ghovanloo,et al.  An Implantable Peripheral Nerve Recording and Stimulation System for Experiments on Freely Moving Animal Subjects , 2018, Scientific Reports.

[27]  Reza Mahmoudi,et al.  Adaptive Impedance-Matching Techniques for Controlling L Networks , 2010, IEEE Transactions on Circuits and Systems I: Regular Papers.

[28]  Reza Mahmoudi,et al.  A GSM/EDGE/WCDMA Adaptive Series-LC Matching Network Using RF-MEMS Switches , 2008, IEEE Journal of Solid-State Circuits.

[29]  M. Mazo,et al.  System for assisted mobility using eye movements based on electrooculography , 2002, IEEE Transactions on Neural Systems and Rehabilitation Engineering.

[30]  Jon A. Mukand,et al.  Neuronal ensemble control of prosthetic devices by a human with tetraplegia , 2006, Nature.

[31]  R.F. Kirsch,et al.  Evaluation of Head Orientation and Neck Muscle EMG Signals as Command Inputs to a Human–Computer Interface for Individuals With High Tetraplegia , 2008, IEEE Transactions on Neural Systems and Rehabilitation Engineering.

[32]  Yoosam Na,et al.  Integrated Bias Circuits of RF CMOS Cascode Power Amplifier for Linearity Enhancement , 2012, IEEE Transactions on Microwave Theory and Techniques.