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EE42/100 Fall 2005 Prof. Fearing 1 Week 14b/ Lecture 25 Dec. 1, 2005 Example Applications 1.Class D Audio Amplifier (phasors, opamp, MOSFET) 2. Atomic.

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Presentation on theme: "EE42/100 Fall 2005 Prof. Fearing 1 Week 14b/ Lecture 25 Dec. 1, 2005 Example Applications 1.Class D Audio Amplifier (phasors, opamp, MOSFET) 2. Atomic."— Presentation transcript:

1 EE42/100 Fall 2005 Prof. Fearing 1 Week 14b/ Lecture 25 Dec. 1, 2005 Example Applications 1.Class D Audio Amplifier (phasors, opamp, MOSFET) 2. Atomic Force Microscope

2 EE42/100 Fall 2005 Prof. Fearing 2 www.irf.com/product-info/audio/classdtutorial.pdf Traditional Linear Amplifier

3 EE42/100 Fall 2005 Prof. Fearing 3 Example: Vcc = 25V, load = 1 ohms, IXYS 24N50 current

4 EE42/100 Fall 2005 Prof. Fearing 4

5 EE42/100 Fall 2005 Prof. Fearing 5 http://www.extron.com/technology/archive.asp?id=ts122001 How Pulse Width Modulation Works

6 EE42/100 Fall 2005 Prof. Fearing 6 vovo http://users.ece.gatech.edu/~mleach/ece4435/f01/ClassD2.pdf How a Triangle Output Oscillator Works (relaxation oscillator) V1V1 -V 1 vTvT vovo

7 EE42/100 Fall 2005 Prof. Fearing 7 Output Stage |H(  )|  -50V +50V VLVL Vin

8 EE42/100 Fall 2005 Prof. Fearing 8 Whole Class D amplifier

9 EE42/100 Fall 2005 Prof. Fearing 9 feedback Integrator and Input Circuitry

10 EE42/100 Fall 2005 Prof. Fearing 10 Quantize and Gate Drive

11 EE42/100 Fall 2005 Prof. Fearing 11 Output Section Gate Driver

12 EE42/100 Fall 2005 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

13 EE42/100 Fall 2005 Prof. Fearing 13 2. Example Micromechatronic System: Atomic Force Microscope http://stm2.nrl.navy.mil/how-afm/how-afm.html

14 EE42/100 Fall 2005 Prof. Fearing 14

15 EE42/100 Fall 2005 Prof. Fearing 15 http://stm2.nrl.navy.mil/how-afm/how-afm.html

16 EE42/100 Fall 2005 Prof. Fearing 16 Target density: 1 terabit/sq. in. Example Application: Atomic Force Microscopy/Data Storage http://www.zurich.ibm.com/st/storage/millipede.html

17 EE42/100 Fall 2005 Prof. Fearing 17 Example Application: Atomic Force Microscopy/Data Storage Target density: 1 terabit/sq. in. http://www.zurich.ibm.com/st/storage/millipede.html thermal actuation/readout

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