CS-EE 481 Spring 2005 1Founders Day, 2005 University of Portland School of Engineering Project Bighorn : A CMOS Low Pass Switched-Capacitor Filter Authors.

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Presentation transcript:

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Project Bighorn : A CMOS Low Pass Switched-Capacitor Filter Authors Brien Bliatout DeMarcus Levy Samuel Russum Advisor Dr. Peter Osterberg Industry Representative Mr. Michael Desmith Intel

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Special Thanks Dr. Osterberg – Ideas & Guidance Mr. Desmith – Ideas & Guidance Andrew Hui – Debugging & Ideas Sandy Ressel – Parts Dr. Lu – 555 Chip & Delay Line MEP (MOSIS Educational Program)

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Agenda Introduction DeMarcus Background Brien Methods Sam Results DeMarcus/Sam Conclusions DeMarcus Demonstration

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering What is Project Bighorn? Low Pass Switched-Capacitor Filter (LPSCF) Purpose: –Analog amplifiers are large Resistors –IC Implementation Plausible –Filter Bandwidth Variation –Accuracy

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Importance Dr. Osterberg EE 451 Class Demonstration 1 st Switched-Capacitor Filter (SCF) at UP

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering What You Will Learn Switched-Capacitor (SC) Component vs. Resistor SCF

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Background General 1 st Order Filter -R 2 (1 + C 1 R 1 s) R 1 (1 + C 2 R 2 s) T(s) = R1R1 R2R2

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering SC Equivalent of a Resistor 1 fsC1fsC1 =

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering General 1 st Order SCF

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Bighorn 1 st Order LPSCF

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Ideal Clock Signals f s = 17 kHz

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Frequency Response

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Ideal System Response Gain = -10 V/V = +20dB -3dB point = 186 Hz Band Pass = 180 o -3dB = 137 o

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering S and Z Domain Relation T(s) = -R 2 R 1 (1+ R 2 C A s) R 1 =1/(f s C 2 ) R 2 = 1/(f s C 3 ) T(s) = -C 2 C 3 [1+ C A /(f s C 2 ) s] ω H = 1/(R 2 C A ) f H = 1/(2πR 2 C A ) ω H = f s C 2 /(C A ) f H = f s C 2 /(2πC A ) f s >> f i T(z) can be represented as continuous

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Methods Waterfall Method

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Results Block Diagram

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Bighorn LPSCF

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering 555 Schematic

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Φ 2 Clock Signal

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Delay Line

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Ideal Clock Signals

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Macro Model SCF

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering MOSIS Layout

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering MOSIS Layout Close-up

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Final Product

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering MOSIS Chip Faults

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Conclusion SCF Definition Why SCF? L-Edit Considerations Bottom Line: 1 st SCF at UP & Demo Vehicle

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Demonstration Input Signal Output Signal—Shows Gain -3db point—Shows Filtering

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Demonstration

CS-EE 481 Spring Founders Day, 2005 University of Portland School of Engineering Any Questions? Thank You!

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