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 transcript:

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

EE42/100 Fall 2005 Prof. Fearing 2 Traditional Linear Amplifier

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

EE42/100 Fall 2005 Prof. Fearing 4

EE42/100 Fall 2005 Prof. Fearing 5 How Pulse Width Modulation Works

EE42/100 Fall 2005 Prof. Fearing 6 vovo How a Triangle Output Oscillator Works (relaxation oscillator) V1V1 -V 1 vTvT vovo

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

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

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

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

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

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

EE42/100 Fall 2005 Prof. Fearing Example Micromechatronic System: Atomic Force Microscope

EE42/100 Fall 2005 Prof. Fearing 14

EE42/100 Fall 2005 Prof. Fearing 15

EE42/100 Fall 2005 Prof. Fearing 16 Target density: 1 terabit/sq. in. Example Application: Atomic Force Microscopy/Data Storage

EE42/100 Fall 2005 Prof. Fearing 17 Example Application: Atomic Force Microscopy/Data Storage Target density: 1 terabit/sq. in. thermal actuation/readout