Week 14b/ Lecture 25 Dec. 1, 2005

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Week 14b/ Lecture 25 Dec. 1, 2005

• Example Applications
• Class D Audio Amplifier
• (phasors, opamp, MOSFET)
• 2. Atomic Force Microscope

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Traditional Linear Amplifier
www.irf.com/product-info/audio/classdtutorial.pdf
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Example Vcc 25V, load 1 ohms, IXYS 24N50
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How Pulse Width Modulation Works
http//www.extron.com/technology/archive.asp?idts
122001
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How a Triangle Output Oscillator Works
(relaxation oscillator)
http//users.ece.gatech.edu/mleach/ece4435/f01/Cl
assD2.pdf
V1
vo
-V1
vo
vT
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Output Stage
50V
Vin
VL
-50V
H(w)
w
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Whole Class D amplifier
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Integrator and Input Circuitry
feedback
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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 limiter op amp integrator 1 bit
quantizer (comparator) protection logic push-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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Example Application Atomic Force Microscopy/Data
Storage
Target density 1 terabit/sq. in.
http//www.zurich.ibm.com/st/storage/millipede.htm
l
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Example Application Atomic Force Microscopy/Data
Storage
Target density 1 terabit/sq. in.
thermal actuation/readout
http//www.zurich.ibm.com/st/storage/millipede.htm
l