Human body communication is proposed as a promising body proximal communication technology for body sensor networks.To achieve low power and small volume in the sensor nodes,a Radio Frequency (RF) application-specific...Human body communication is proposed as a promising body proximal communication technology for body sensor networks.To achieve low power and small volume in the sensor nodes,a Radio Frequency (RF) application-specific integrated circuit transceiver for Human Body Communication (HBC) is presented and the characteristics of HBC are investigated.A high data rate On-Off Keying (OOK)/Frequency-Shift Keying (FSK) modulation protocol and an OOK/FSK demodulator circuit are introduced in this paper,with a data-rate-to-carrier-frequency ratio up to 70%.A low noise amplifier is proposed to handle the dynamic range problem and improve the sensitivity of the receiver path.In addition,a low power automatic-gain-control system is realized using a novel architecture,thereby rendering the peak detector circuit and loop filter unnecessary.Finally,the complete chip is fabricated.Simulation results suggest receiver sensitivity to be-75 dBm.The transceiver shows an overall power consumption of 3.2 mW when data rate is 5 Mbps,delivering a P1 dB output power of-30 dBm.展开更多
Dielectric elastomer actuators(DEAs)are one of the most promising soft actuation technologies owing to their relatively high power density and electromechanical efficiency enabled by a resonant actuation technique.How...Dielectric elastomer actuators(DEAs)are one of the most promising soft actuation technologies owing to their relatively high power density and electromechanical efficiency enabled by a resonant actuation technique.However,existing DEA designs suffer from a very narrow optimal output bandwidth close to resonance and poor output control capability due to their fixed geometrical configurations.This condition greatly limits their applications in programmable actuation and broad-bandwidth applications.Accordingly,this work developed a novel resonance tunable DEA(RTDEA)design for broad-optimal-output actuation bandwidths that is enabled by an integration of a stiffness and voltage control strategy.This design features a broad resonant frequency adjustment from 84 to 126 Hz and independent tunings of its resonant amplitude and frequency.Parametric studies were conducted to illustrate the fundamental principles behind the resonance tuning strategy,and optimization was performed to maximize the tuning capability.Here,a resonance tuning control strategy is proposed to achieve accurate adjustments of the RTDEA’s resonance based on the stiffness and voltage control strategy.These resonance tunable soft actuators are envisioned to greatly expand DEAs’applications in,for instance,soft robotic locomotion,human–robot communication,and active vibrational control with demands of broad actuation bandwidths and high output performance.展开更多
基金This study was supported partially by the Projects of National Natural Science Foundation of China under Crants No. 60932001, No.61072031 the National 863 Program of China un-der Crant No. 2012AA02A604+3 种基金 the National 973 Program of China under Cwant No. 2010CB732606 the Next Generation Communication Technology Major Project of National S&T un-der Crant No. 2013ZX03005013 the "One-hundred Talent" and the "Low-cost Healthcare" Programs of Chinese Academy of Sciences and the Guangdong Innovation Research Team Funds for Low-cost Healthcare and Irrage-Guided Therapy.
文摘Human body communication is proposed as a promising body proximal communication technology for body sensor networks.To achieve low power and small volume in the sensor nodes,a Radio Frequency (RF) application-specific integrated circuit transceiver for Human Body Communication (HBC) is presented and the characteristics of HBC are investigated.A high data rate On-Off Keying (OOK)/Frequency-Shift Keying (FSK) modulation protocol and an OOK/FSK demodulator circuit are introduced in this paper,with a data-rate-to-carrier-frequency ratio up to 70%.A low noise amplifier is proposed to handle the dynamic range problem and improve the sensitivity of the receiver path.In addition,a low power automatic-gain-control system is realized using a novel architecture,thereby rendering the peak detector circuit and loop filter unnecessary.Finally,the complete chip is fabricated.Simulation results suggest receiver sensitivity to be-75 dBm.The transceiver shows an overall power consumption of 3.2 mW when data rate is 5 Mbps,delivering a P1 dB output power of-30 dBm.
基金supported by the National Key Research and Development Program of China(Grant No.2019YFB1311600)the National Natural Science Foundation of China(Grant No.62003333)+2 种基金the Shenzhen Fundamental Research Project(Grant No.JCYJ20200109115639654)the Guangdong Basic and Applied Basic Research Foundation(Grant No.2020A1515110175)the China Postdoctoral Science Foundation(Grant No.2020M682978)。
文摘Dielectric elastomer actuators(DEAs)are one of the most promising soft actuation technologies owing to their relatively high power density and electromechanical efficiency enabled by a resonant actuation technique.However,existing DEA designs suffer from a very narrow optimal output bandwidth close to resonance and poor output control capability due to their fixed geometrical configurations.This condition greatly limits their applications in programmable actuation and broad-bandwidth applications.Accordingly,this work developed a novel resonance tunable DEA(RTDEA)design for broad-optimal-output actuation bandwidths that is enabled by an integration of a stiffness and voltage control strategy.This design features a broad resonant frequency adjustment from 84 to 126 Hz and independent tunings of its resonant amplitude and frequency.Parametric studies were conducted to illustrate the fundamental principles behind the resonance tuning strategy,and optimization was performed to maximize the tuning capability.Here,a resonance tuning control strategy is proposed to achieve accurate adjustments of the RTDEA’s resonance based on the stiffness and voltage control strategy.These resonance tunable soft actuators are envisioned to greatly expand DEAs’applications in,for instance,soft robotic locomotion,human–robot communication,and active vibrational control with demands of broad actuation bandwidths and high output performance.