RF-front end for wireless powered neural applications

This paper presents a 2.4 GHz RF front end for use in a wireless powered micro neural interface systems. The front end consists of a matching network and a two stage rectifier. A programmable current source is included for circuit validation. There is a great and growing need for wirelessly powering biological implants. Specifically, we are addressing a need for neural sensors and stimulators were total power dissipation must be less than 1 mW for safety reasons. Subthreshold CMOS analog circuits operate successfully over a large range of supply voltages. A wide range of output voltages from -250 mV up to 2.4V are observed when varying the load current at a fixed input power and vice versa. The total chip area including bond pads is 0.730 mm2.The designs were fabricated using peregrine 0.5 micron silicon on sapphire process.

[1]  François Krummenacher,et al.  A model for /spl mu/-power rectifier analysis and design , 2005, IEEE Transactions on Circuits and Systems I: Regular Papers.

[2]  S. Ramo,et al.  Fields and Waves in Communication Electronics , 1966 .

[3]  Miko Elwenspoek,et al.  Characterization of a planar microcoil for implantable microsystems , 1997 .

[4]  Lawrence C. Chirwa,et al.  Electromagnetic radiation from ingested sources in the human intestine between 150 MHz and 1.2 GHz , 2003, IEEE Transactions on Biomedical Engineering.

[5]  Shuenn-Yuh Lee,et al.  An implantable wireless bidirectional communication microstimulator for neuromuscular stimulation , 2005, IEEE Transactions on Circuits and Systems I: Regular Papers.

[6]  Constantine A. Balanis,et al.  Antenna Theory: Analysis and Design , 1982 .

[7]  F. C. Flack,et al.  Mutual inductance of air-cored coils: Effect on design of radio-frequency coupled implants , 1971, Medical and biological engineering.

[8]  S. Lazar,et al.  Design of multistage rectifiers with low-cost impedance matching for passive RFID tags , 2006, IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2006.

[9]  P. Schmalbrock,et al.  Electromagnetic perspective on the operation of RF coils at 1.5–11.7 Tesla , 2005, Magnetic resonance in medicine.

[10]  Designing the Virtual Battery Application Note 1088 , 2022 .

[11]  M. Dorman,et al.  Simulating the effect of cochlear-implant electrode insertion depth on speech understanding. , 1997, The Journal of the Acoustical Society of America.

[12]  A. Y. Chow,et al.  The artificial silicon retina microchip for the treatment of vision loss from retinitis pigmentosa. , 2004, Archives of ophthalmology.

[13]  C. Gabriel.  Compilation of the Dielectric Properties of Body Tissues at RF and Microwave Frequencies. , 1996 .

[14]  W.J. Heetderks,et al.  RF powering of millimeter- and submillimeter-sized neural prosthetic implants , 1988, IEEE Transactions on Biomedical Engineering.

[15]  R. White,et al.  A Wide-Band Efficient Inductive Transdennal Power and Data Link with Coupling Insensitive Gain , 1987, IEEE Transactions on Biomedical Engineering.

[16]  G. Lazzi,et al.  Investigation of a microwave data telemetry link for a retinal prosthesis , 2004, IEEE Transactions on Microwave Theory and Techniques.

[17]  Miguel A. L. Nicolelis,et al.  Brain–machine interfaces: past, present and future , 2006, Trends in Neurosciences.

[18]  Tamer S. Ibrahim,et al.  Evaluation of MRI RF probes utilizing infrared sensors , 2006, IEEE Transactions on Biomedical Engineering.

[19]  William G. Scanlon,et al.  Radiowave propagation from a tissue-implanted source at 418 MHz and 916.5 MHz , 2000, IEEE Transactions on Biomedical Engineering.