Abstract
We present a batteryless, crystal-free, time division multiple access (TDMA) synchronized multinode wireless body sensor node (WBSN) system-on-chip (SoC), referred to as a Bionode, for continuous and real-time telemetry of electromyograms (EMGs), enabling intuitive upper limb prosthesis control by an amputee. The SoC utilizes state of the art in supercapacitive RF energy harvesting, biosensing analog-front-end, switching-optimized SAR ADC, ultra-low-power RF transceiver, and clock circuits. The sensor node SoCs are time synchronized with a base station, mounted on the prosthetic arm, by using the ultra-low-power TDMA controller and receiver, and the digital core circuits. A 915 MHz broadcast RF signal is utilized to synthesize the carrier frequency of the transmitter. This along with the process and voltage compensated on-chip clock obviates the need for a bulky crystal oscillator, thus providing a low-cost and highly integrated solution to the WBSNs. The SoC is verified by capturing the EMG data from a healthy human body and consumes only 24 μW, while operating exclusively from the harvested RF energy. Implemented in a 0.18 μm CMOS process, the SoC occupies 2.025 mm2 silicon area. The sensor node has an extremely low weight and physical dimensions, thanks to the flexible carbon nanotube (CNT) supercapacitor, electrically small antenna (ESA), and crystal-free operation of the SoC.
| Original language | English (US) |
|---|---|
| Article number | 7299274 |
| Pages (from-to) | 2714-2727 |
| Number of pages | 14 |
| Journal | IEEE Journal of Solid-State Circuits |
| Volume | 50 |
| Issue number | 11 |
| DOIs | |
| State | Published - Oct 15 2015 |
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All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
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A 24 μW, Batteryless, Crystal-free, Multinode Synchronized SoC "Bionode" for Wireless Prosthesis Control. / Bhamra, Hansraj; Kim, Young Joon; Joseph, Jithin; Lynch, John; Gall, Oren Zaak; Mei, Henry; Meng, Chuizhou; Tsai, Jui Wei; Irazoqui, Pedro.
In: IEEE Journal of Solid-State Circuits, Vol. 50, No. 11, 7299274, 15.10.2015, p. 2714-2727.Research output: Contribution to journal › Article
TY - JOUR
T1 - A 24 μW, Batteryless, Crystal-free, Multinode Synchronized SoC "Bionode" for Wireless Prosthesis Control
AU - Bhamra, Hansraj
AU - Kim, Young Joon
AU - Joseph, Jithin
AU - Lynch, John
AU - Gall, Oren Zaak
AU - Mei, Henry
AU - Meng, Chuizhou
AU - Tsai, Jui Wei
AU - Irazoqui, Pedro
PY - 2015/10/15
Y1 - 2015/10/15
N2 - We present a batteryless, crystal-free, time division multiple access (TDMA) synchronized multinode wireless body sensor node (WBSN) system-on-chip (SoC), referred to as a Bionode, for continuous and real-time telemetry of electromyograms (EMGs), enabling intuitive upper limb prosthesis control by an amputee. The SoC utilizes state of the art in supercapacitive RF energy harvesting, biosensing analog-front-end, switching-optimized SAR ADC, ultra-low-power RF transceiver, and clock circuits. The sensor node SoCs are time synchronized with a base station, mounted on the prosthetic arm, by using the ultra-low-power TDMA controller and receiver, and the digital core circuits. A 915 MHz broadcast RF signal is utilized to synthesize the carrier frequency of the transmitter. This along with the process and voltage compensated on-chip clock obviates the need for a bulky crystal oscillator, thus providing a low-cost and highly integrated solution to the WBSNs. The SoC is verified by capturing the EMG data from a healthy human body and consumes only 24 μW, while operating exclusively from the harvested RF energy. Implemented in a 0.18 μm CMOS process, the SoC occupies 2.025 mm2 silicon area. The sensor node has an extremely low weight and physical dimensions, thanks to the flexible carbon nanotube (CNT) supercapacitor, electrically small antenna (ESA), and crystal-free operation of the SoC.
AB - We present a batteryless, crystal-free, time division multiple access (TDMA) synchronized multinode wireless body sensor node (WBSN) system-on-chip (SoC), referred to as a Bionode, for continuous and real-time telemetry of electromyograms (EMGs), enabling intuitive upper limb prosthesis control by an amputee. The SoC utilizes state of the art in supercapacitive RF energy harvesting, biosensing analog-front-end, switching-optimized SAR ADC, ultra-low-power RF transceiver, and clock circuits. The sensor node SoCs are time synchronized with a base station, mounted on the prosthetic arm, by using the ultra-low-power TDMA controller and receiver, and the digital core circuits. A 915 MHz broadcast RF signal is utilized to synthesize the carrier frequency of the transmitter. This along with the process and voltage compensated on-chip clock obviates the need for a bulky crystal oscillator, thus providing a low-cost and highly integrated solution to the WBSNs. The SoC is verified by capturing the EMG data from a healthy human body and consumes only 24 μW, while operating exclusively from the harvested RF energy. Implemented in a 0.18 μm CMOS process, the SoC occupies 2.025 mm2 silicon area. The sensor node has an extremely low weight and physical dimensions, thanks to the flexible carbon nanotube (CNT) supercapacitor, electrically small antenna (ESA), and crystal-free operation of the SoC.
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U2 - 10.1109/JSSC.2015.2480854
DO - 10.1109/JSSC.2015.2480854
M3 - Article
AN - SCOPUS:84947044276
VL - 50
SP - 2714
EP - 2727
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
SN - 0018-9200
IS - 11
M1 - 7299274
ER -