* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download precision microfluidic oscillators for on
Oscilloscope history wikipedia , lookup
Transistor–transistor logic wikipedia , lookup
Power electronics wikipedia , lookup
Beam-index tube wikipedia , lookup
Nanofluidic circuitry wikipedia , lookup
Crystal radio wikipedia , lookup
Mathematics of radio engineering wikipedia , lookup
Digital electronics wikipedia , lookup
Rectiverter wikipedia , lookup
Negative resistance wikipedia , lookup
Time-to-digital converter wikipedia , lookup
MOS Technology SID wikipedia , lookup
Atomic clock wikipedia , lookup
Electronic engineering wikipedia , lookup
Radio receiver wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Flexible electronics wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Opto-isolator wikipedia , lookup
Superheterodyne receiver wikipedia , lookup
Phase-locked loop wikipedia , lookup
Radio transmitter design wikipedia , lookup
Integrated circuit wikipedia , lookup
RLC circuit wikipedia , lookup
Index of electronics articles wikipedia , lookup
Philip N. Duncan, Transon V. Nguyen and Elliot E. Hui Department of Biomedical Engineering, University of California, Irvine, CA, USA Professor: Cheng-Hsien, Liu Student: Hao-Ran, Shih (9933533) Date: 2010/12/28 Outline ABSTRACT INTRODUCTION THEORY EXPERIMENTAL CONCLUSION ABSTRACT 1.A precision pneumatic oscillator which provides timing signals for integrated microfluidic digital logic circuits 2.The design is based on the classical ring oscillator circuit and requires only a vacuum supply for power 3.Integrate pneumatic and fluidic circuits to create an autonomously driven peristaltic pump INTRODUCTION 1.Microfluidic Large-Scale-Integration has been a highly successful technology for the automation of multiplexed chemical reactions 2.A control system built solely out of microfluidic components would be attractive because it could be manufactured in parallel with fluid-handling elements on a single chip 3.Lab-on-a-chip devices require timing to control fluidhandling elements such as peristaltic pumps must be driven by carefully coordinated waveforms THEORY Device fabrication Mathies technology IN OUT Vacuum Source Ground Ring Oscillator Circuit 1.The system is inherently unstable and will thus oscillate indefinitely. (odd number ) 2.The frequency of oscillation should vary linearly with 1/(pneumatic resistance ), allowing tuning of the oscillator. EXPERIMENTAL mask layout for a 3inverter ring oscillator photodiode detector Movement of the elastomeric membrane in the valve causes a deflection of the laser beam resulting in a change in measured intensity Frequency Design other resistances in the circuit begin to dominate, such as the resistance of the lines connecting the 3 inverter stages saturate changing the mask layout to minimize interconnect distances The worst long-term drift was measured to be approximately 4% per hour. The timing of a 1-hour chemicalreaction should be accurate to within 3 minutes. The use of an oscillating pneumatic circuit to drive the operation of a peristaltic pump Next page CONCLUSION 1.The tuning of oscillator frequency through the variation of resistor sizes in the circuit, achieving a range of 1 Hz to 100 Hz. 2.No characterized oscillator stability,but establishing in devices that the short-term fluctuation and longterm drift is suitable for lab-on-a-chip applications. 3.The only external input required is a vacuum source, it may be possible to use such devices in limited-resource settings. Thanks for your listening~