access icon openaccess Ultra-low-power wireless transmitter for neural prostheses with modified pulse position modulation

An ultra-low-power wireless transmitter for embedded bionic systems is proposed, which achieves 40 pJ/b energy efficiency and delivers 500 kb/s data using the medical implant communication service frequency band (402–405 MHz). It consumes a measured peak power of 200 µW from a 1.2 V supply while occupying an active area of 0.0016 mm2 in a 130 nm technology. A modified pulse position modulation technique called saturated amplified signal is proposed and implemented, which can reduce the overall and per bit transferred power consumption of the transmitter while reducing the complexity of the transmitter architectures, and hence potentially shrinking the size of the implemented circuitry. The design is capable of being fully integrated on single-chip solutions for surgically implanted bionic systems, wearable devices and neural embedded systems.

Inspec keywords: pulse modulation; embedded systems; biomedical telemetry; prosthetics; surgery; neurophysiology; transmitters; wireless sensor networks

Other keywords: embedded bionic systems; single-chip solutions; saturated amplified signal; bit rate 500 kbit/s; Medical Implant Communication Service frequency band; transmitter architecture complexity; energy efficiency; circuitry size; size 130 nm; wearable devices; voltage 1.2 V; neural embedded systems; frequency 402 MHz to 405 MHz; surgically implanted bionic systems; ultralow-power wireless transmitter; power 200 muW; modified pulse position modulation technique; overall transferred power consumption; per bit transferred power consumption; neural prostheses

Subjects: Patient care and treatment; Prosthetics and other practical applications; Biomedical communication; Wireless sensor networks; Prosthetics and orthotics; Telemetering systems; Biomedical measurement and imaging

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      • 6. Goodarzy, F., Koushaeian, L., Ghafari, B., Skafidas, E.: ‘An ultra low power digital receiver architecture for biomedical applications’. Proc. 2011 IEEE Biomedical Circuits and Systems Conf. (BioCAS), San Diego, CA, USA, November 2011, pp. 173176.
http://iet.metastore.ingenta.com/content/journals/10.1049/htl.2013.0012
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