Week 14b/ Lecture 25 Dec. 1, 2005 - PowerPoint PPT Presentation

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Week 14b/ Lecture 25 Dec. 1, 2005

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Week 14b/ Lecture 25 Dec. 1, 2005
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Week 14b/ Lecture 25 Dec. 1, 2005

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  1. Week 14b/ Lecture 25 Dec. 1, 2005 Example Applications • Class D Audio Amplifier • (phasors, opamp, MOSFET) 2. Atomic Force Microscope Prof. Fearing

  2. Traditional Linear Amplifier www.irf.com/product-info/audio/classdtutorial.pdf Prof. Fearing

  3. current Example: Vcc = 25V, load = 1 ohms, IXYS 24N50 Prof. Fearing

  4. Prof. Fearing

  5. How Pulse Width Modulation Works http://www.extron.com/technology/archive.asp?id=ts122001 Prof. Fearing

  6. How a Triangle Output Oscillator Works (relaxation oscillator) http://users.ece.gatech.edu/~mleach/ece4435/f01/ClassD2.pdf V1 vo -V1 vo vT Prof. Fearing

  7. Output Stage +50V Vin VL -50V |H(w)| w Prof. Fearing

  8. Whole Class D amplifier Prof. Fearing

  9. Integrator and Input Circuitry feedback Prof. Fearing

  10. Quantize and Gate Drive Prof. Fearing

  11. Output Section Gate Driver Prof. Fearing

  12. Class D Amplifier Summary- Review Concepts push-pull output (load line) (compare to CMOS output) diode limiter op amp integrator 1 bit quantizer (comparator) protection logic push-pull output (load line) (compare to CMOS output) low pass filter Prof. Fearing

  13. 2. Example Micromechatronic System: Atomic Force Microscope http://stm2.nrl.navy.mil/how-afm/how-afm.html Prof. Fearing

  14. Prof. Fearing

  15. http://stm2.nrl.navy.mil/how-afm/how-afm.html Prof. Fearing

  16. Example Application: Atomic Force Microscopy/Data Storage Target density: 1 terabit/sq. in. http://www.zurich.ibm.com/st/storage/millipede.html Prof. Fearing

  17. Example Application: Atomic Force Microscopy/Data Storage Target density: 1 terabit/sq. in. thermal actuation/readout http://www.zurich.ibm.com/st/storage/millipede.html Prof. Fearing