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Okabe K.,Toyohashi University of Technology | Akita I.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | Ishida M.,Electronics Inspired Interdisciplinary Research Institute EIIRIS
Japanese Journal of Applied Physics | Year: 2014

This paper presents a high-gain on-chip antenna using a sapphire substrate for implantable wireless medical systems. The antenna model is based on a dipole and the antenna elements are appropriately rolled for impedance matching. The center frequency of the fabricated on-chip antenna was measured as 360 MHz. The return loss was %3.58 dB and the input impedance was 190.5 % j74.7 at 360 MHz. The maximum antenna gain of the fabricated on-chip antenna was %29.2 dBi. The on-chip antenna using a sapphire substrate achieved a 12.9 dB higher gain than that using a silicon substrate and successfully induced signal transmission at a distance of 10cm with a transmitter chip. The implemented onchip antenna can improve the power efficiency of implantable wireless medical systems by 95%. © 2014 The Japan Society of Applied Physics. Source


Haibi H.,Toyohashi University of Technology | Akita I.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | Ishida M.,Electronics Inspired Interdisciplinary Research Institute EIIRIS
Proceedings of the 2013 IEEE Asian Solid-State Circuits Conference, A-SSCC 2013 | Year: 2013

This paper presents a low-noise small-area three-stage operational amplifier using split active-feedback compensation (SAFC) which is suitable for biomedical arrayed sensors. The proposed SAFC amplifier only requires a small capacitance for phase compensation, while it can achieve a low input-referred noise by increasing the first-stage transconductance without sacrificing the phase margin. The proposed SAFC amplifier has been implemented using a standard 0.18-μm CMOS process. The measurement results show that the proposed SAFC amplifier achieves >120-dB DC gain, 6.2-MHz gain bandwidth product, and phase margin of 60°. The measured input-referred noise is 27 nV/√Hz. The current dissipation is measured as 177 μA at a power supply of 1.5 V and it achieves a noise efficiency factor of 14. © 2013 IEEE. Source


Akita I.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | Ishida M.,Electronics Inspired Interdisciplinary Research Institute EIIRIS
Digest of Technical Papers - IEEE International Solid-State Circuits Conference | Year: 2013

A small-area low-power low-noise instrumentation amplifier (IA) is desired in arrayed sensor devices that are used for high-spatial-resolution biomedical and environment monitoring systems. This paper presents a 0.06mm2 chopper-stabilized current-feedback IA with 13.5nV/√Hz input-referred noise and less than 3.5μV offset voltage. For significantly reducing the ripple due to chopping, the proposed IA uses a novel digital calibration scheme, namely, automatic differential-pair matching (ADPM), which enables a small die area and low-power operation. The proposed IA is implemented in a standard 0.18μm CMOS and achieves a noise efficiency factor (NEF) of 7.2 while drawing 194μA. The active area of the IA is 7.8× smaller than that of the state-of-the-art [1-5] while it maintains low output ripple, low noise, and low power. © 2013 IEEE. Source


Ishida M.,Toyohashi University of Technology | Ishida M.,Electronics Inspired Interdisciplinary Research Institute EIIRIS | Sawada K.,Toyohashi University of Technology | Sawada K.,Electronics Inspired Interdisciplinary Research Institute EIIRIS | Sawada K.,Japan Science and Technology Agency
IEEJ Transactions on Sensors and Micromachines | Year: 2011

We have been investigated "intelligent sensing" device chip that incorporates advanced intelligence by fusing LSIs, Sensors, and MEMS devices. These intelligent sensing devices are developed in a unique facility, where all the processes from the design to the evaluation of LSIs are consistently conducted in one organization, which is rare in the world according to the midterm assessment of the 21st Century COE. In this paper, we introduce our recent activity of smart bio chip. © 2011 The Institute of Electrical Engineers of Japan. Source


Masuya Y.,Toyohashi University of Technology | Ozawa R.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | Ishida M.,Japan Science and Technology Agency | And 5 more authors.
2015 Transducers - 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2015 | Year: 2015

We developed an optical interferometeric surface-stress sensor which utilizes the nonlinear optical transmittance change in the Fabry-Perot interference to enhance the sensitivity of the surface-stress, integrated with a microfluidic channel for fast biosensing. A 30-μm-thick photosensitive dry film resist was laminated on the sensor, followed by a standard photolithography to form microfluidic channel. During the liquid supplying to the sensor, no liquid leakage into nano cavity was observed because output photocurrent shows constant. Photocurrent change of 8 nA was obtained when an anti-bovine serum albumin (BSA) with concentration of 100 ng/ml was injected with flow rate of 1 μl/min. Response time was successfully improved to be several tens of seconds. © 2015 IEEE. Source

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