Week 14b/ Lecture 25 Dec. 1, 2005
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Transcript of Week 14b/ Lecture 25 Dec. 1, 2005
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EE42/100 Fall 2005 Prof. Fearing 1
Week 14b/ Lecture 25 Dec. 1, 2005
Example Applications1. Class D Audio Amplifier• (phasors, opamp, MOSFET)
2. Atomic Force Microscope
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EE42/100 Fall 2005 Prof. Fearing 2
www.irf.com/product-info/audio/classdtutorial.pdf
Traditional Linear Amplifier
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Example: Vcc = 25V, load = 1 ohms, IXYS 24N50
current
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EE42/100 Fall 2005 Prof. Fearing 4
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http://www.extron.com/technology/archive.asp?id=ts122001
How Pulse Width Modulation Works
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vo
http://users.ece.gatech.edu/~mleach/ece4435/f01/ClassD2.pdf
How a Triangle Output Oscillator Works (relaxation oscillator)
V1
-V1
vT
vo
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Output Stage
|H()|
-50V
+50V
VLVin
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Whole Class D amplifier
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feedback
Integrator and Input Circuitry
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Quantize and Gate Drive
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Output Section
Gate Driver
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Class D Amplifier Summary- Review Concepts
push-pull output (load line) (compare to CMOS output)diode limiterop amp integrator1 bit quantizer (comparator)protection logicpush-pull output (load line) (compare to CMOS output)low pass filter
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2. Example Micromechatronic System: Atomic Force Microscope
http://stm2.nrl.navy.mil/how-afm/how-afm.html
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http://stm2.nrl.navy.mil/how-afm/how-afm.html
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Target density: 1 terabit/sq. in.
Example Application: Atomic Force Microscopy/Data Storage
http://www.zurich.ibm.com/st/storage/millipede.html
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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