A 0.6 μm CMOS bandgap voltage reference circuit

On the basis of mutual compensation of mobility and threshold voltage temperature effects, a stable CMOS band-gap voltage reference circuit was designed and fabricated in CSMC-HJ 0.6 μm CMOS technology. Operating from 0 to 85 ℃ under a supply voltage ranging from 4.5 to 5.5 V, the voltage reference circuit offers an output reference voltage ranging from 1.122 to 1.176 V and a voltage variation less than ±3.70%. The chip size including bonding pads is only 0.4 mm×0.4 mm and the power dissipation falls inside the scope of 28.3 to 48.8 mW operating at a supply voltage of 4.5 to 5.5 V.

Audiovisual bimodal mutual compensation of Chinese

The perception of human languages is inherently a multi-modalprocess, in which audio information can be compensated by visual information to improve the recognition performance. Such a phenomenon in English, German, Spanish and so on has been researched, but in Chinese it has not been reported yet. In our experiment, 14 syllables (/ba, bi, bian, biao, bin, de, di, dian, duo, dong, gai, gan, gen, gu/), extracted from Chinese audiovisual bimodal speech database CAVSR-1.0, were pronounced by 10 subjects. The audio-only stimuli, audiovisual stimuli, and visual-only stimuli were recognized by 20 observers. The audio-only stimuli and audiovisual stimuli both were presented under 5 conditions: no noise, SNR 0 dB, -8 dB, -12 dB, and -16 dB. The experimental result is studied and the following conclusions for Chinese speech are reached. Human beings can recognize visual-only stimuli rather well. The place of articulation determines the visual distinction. In noisy environment, audio information can remarkably be compensated by visual information and as a result the recognition performance is greatly improved.

New mutual coupling compensation method and its application in DOA estimation

A new mutual coupling compensation method based on a new mutual impedance matrix,as well as its application to dipole arrays,are proposed.This new mutual impedance matrix is deduced by electromotive force(EMF)method,based on the current distribution obtained by the characteristic basis function method.It appears in a concise and explicit formulation that facilitates the numerical calculation.The compensation performance is demonstrated and evaluated through its application in direction of arrival(DOA)estimation.Numerical results show that the proposed method exhibits excellent compensation performance compared with conventional mutual impedance matrix approaches.

A temperature-insensitive silver nanostructures@graphene foam for high accuracy and full range human health monitoring

Recently,application-oriented strain sensor has been intensively investigated in the fields of human motion detection,personalized health management and portable medical diagnosis.Despite significant efforts in improving its sensitivity and linear sensing range,developing the wearable strain sensor with stable signal remains a challenge.Herein,we proposed an ideal hybrid material with nearly zero temperature coefficient resistance(TCR)for temperature-insensitive strain sensing:the silver nanostructures(AgNTs)were introduced to coat the graphene foam(GrF)conformably by hydrothermal growth.The nanoscaled metal additives(TCR>0)not only endow GrF(TCR<0)with high electrical stability(TCR≈-0.3×10^(-3)℃^(-1)),but also offer the hybrid system additional structural elasticity,potential for next-generation of portable,stretchable and reliable devices.The resultant AgNTs@GrF hybrid material has been processed into a piezoresistive sensor with excellent sensing accuracy(strain error<2.7%),satisfactory gauge factor(GF)of227,wide sensing range up to 90%and good cyclic stability(>3000 cycles).Moreover,our strain sensor can be easily mounted on human skin as an epidermal device for reliable detection of electrophysiological stimuli,thus showing a great promising in practical wearable applications.