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8 results on '"YONGYAO CAI"'

3. Road to ultra low cost multi-sensor integration

Author

Yongyao Cai and Yang Zhao

Subjects
Microelectromechanical systems, Engineering, Microcontroller, business.industry, Compass, Electrical engineering, Process (computing), Volume (computing), System on a chip, business, Accelerometer, Commercialization
Abstract

The IC industry has gone through fast SOC integration process over the past 50 years. We see MEMS IC sensors will follow the exact path in the years to come. After decades of dreaming, technology advancement, and commercialization efforts, accelerometer is the first one deployed in our daily life with shipment volume reaches 1B units/year. Next sensor to reach 1B units/year will be the magnetic compass. Mainly driven by the mobile market, accelerometer price has dropped from $10/axis in mid 90's to today's $0.10/axis, a 100× drop in 20 years, while compass price has dropped from $1/axis 3 years ago to today's $0.10/axis. As the price is continuously trending towards $0.05/axis, sensing system integration through MEMS-SOC will become the next mainstream technology by combining the advanced MEMS process technology, matured MCU, and sophisticated system algorithm. Based on MEMSIC's MEMS IC commercialization experiences, this paper discusses how the combination of market needs and technology advancement drives the integration roadmap for the integrated MEMS sensing solutions.

Published
2013

4. A micromachined monolithic 3 axis accelerometer based on convection heat transfer

Author

Yongyao Cai, Leyue Jiang, Yang Zhao, and Haidong Liu

Subjects
Convection, Surface micromachining, Materials science, Convective heat transfer, CMOS, Manufacturing process, ComputerSystemsOrganization_MISCELLANEOUS, Thermal, Hardware_INTEGRATEDCIRCUITS, Mechanical engineering, Hardware_PERFORMANCEANDRELIABILITY, Cmos process, Accelerometer
Abstract

In this paper, a monolithic 3 axis thermal accelerometer has been developed based on standard CMOS process. This 3 axis thermal accelerometer use exactly the same sensor area and manufacturing process as 2 axis thermal accelerometer reported in the past. It is easy to mass produce and has low cost, small size.

Published
2013

6. A Theoretical Study of Sea Surface Up/Down Wind Brigthness Temperature Differences.

Author

Johnson, Joel T. and Yongyao Cai

Subjects
*POLARIMETRY, *OCEAN temperature, *SURFACE roughness measurement
Abstract

Studies the up/down wind difference of sea surface brightness temperature using the small slope approximation (SSA) for polarimetric thermal emission from a rough surface. Information on third-order SSA expressions; Discussion on approximation for large-scale wave contributions; Properties of the bispectrum.

Published
2002
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7. Measuring gas flow with MEMS sensors.

Author

YONGYAO CAI

Subjects
*GAS flow, *DETECTORS, *ACCELEROMETERS, *MICROELECTROMECHANICAL systems
Abstract

The article features the MEMSIC MFA1100R gas-flow sensor which uses the thermal principle of operation similar to that of the thermal accelerometer of MEMSIC Inc. The sensors based on thermal microelectromechanical systems (MEMS) have the capacity to provide motion sensing in accelerometers. Gas-flow measurement is needed in the medical market such as that in anesthesia delivery, chromatography, sleep apnea, spirometers, and ventilators.

Published
2013

8. Magnetometer basics for mobile phone applications.

Author

YONGYAO CAI, YANG ZHAO, XIANFENG DING, and FENNELLY, JAMES

Subjects
*MAGNETOMETERS, *MAGNETIC fields, *QUANTUM tunneling, *ELECTRIC conductivity, *MAGNETORESISTANCE, *HALL effect, *LORENTZ force, *ELECTROMAGNETIC fields
Abstract

The article discusses the reevaluation of basic magnetometer technology for mobile phone applications called e-compasses gaussmeters for measuring magnetic fields. It mentions four methods in magnetic sensing approach for consumer mobile phones including magnetic tunneling junction (MJT), anisotropic magnetoresistance (AMR) and giant magnetoresistance (GMR) as well as the Hall effect and Lorentz force. It also notes the importance of sensitivity in magnetometer design.

Published
2012

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