1. CS-EE 481 Spring 2005 1Founders 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

2. CS-EE 481 Spring 2005 2Founders 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)

3. CS-EE 481 Spring 2005 3Founders Day, 2005 University of Portland School of Engineering Agenda Introduction DeMarcus Background Brien Methods Sam Results DeMarcus/Sam Conclusions DeMarcus Demonstration

4. CS-EE 481 Spring 2005 4Founders 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

5. CS-EE 481 Spring 2005 5Founders Day, 2005 University of Portland School of Engineering Importance Dr. Osterberg EE 451 Class Demonstration 1 st Switched-Capacitor Filter (SCF) at UP

6. CS-EE 481 Spring 2005 6Founders Day, 2005 University of Portland School of Engineering What You Will Learn Switched-Capacitor (SC) Component vs. Resistor SCF

7. CS-EE 481 Spring 2005 7Founders 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

8. CS-EE 481 Spring 2005 8Founders Day, 2005 University of Portland School of Engineering SC Equivalent of a Resistor 1 fsC1fsC1 =

9. CS-EE 481 Spring 2005 9Founders Day, 2005 University of Portland School of Engineering General 1 st Order SCF

10. CS-EE 481 Spring 2005 10Founders Day, 2005 University of Portland School of Engineering Bighorn 1 st Order LPSCF

11. CS-EE 481 Spring 2005 11Founders Day, 2005 University of Portland School of Engineering Ideal Clock Signals f s = 17 kHz

12. CS-EE 481 Spring 2005 12Founders Day, 2005 University of Portland School of Engineering Frequency Response

13. CS-EE 481 Spring 2005 13Founders Day, 2005 University of Portland School of Engineering Ideal System Response Gain = -10 V/V = +20dB -3dB point = 186 Hz Phase @ Band Pass = 180 o Phase @ -3dB = 137 o

14. CS-EE 481 Spring 2005 14Founders 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

15. CS-EE 481 Spring 2005 15Founders Day, 2005 University of Portland School of Engineering Methods Waterfall Method

16. CS-EE 481 Spring 2005 16Founders Day, 2005 University of Portland School of Engineering Results Block Diagram

17. CS-EE 481 Spring 2005 17Founders Day, 2005 University of Portland School of Engineering Bighorn LPSCF

18. CS-EE 481 Spring 2005 18Founders Day, 2005 University of Portland School of Engineering 555 Schematic

19. CS-EE 481 Spring 2005 19Founders Day, 2005 University of Portland School of Engineering Φ 2 Clock Signal

20. CS-EE 481 Spring 2005 20Founders Day, 2005 University of Portland School of Engineering Delay Line

21. CS-EE 481 Spring 2005 21Founders Day, 2005 University of Portland School of Engineering Ideal Clock Signals

22. CS-EE 481 Spring 2005 22Founders Day, 2005 University of Portland School of Engineering Macro Model SCF

23. CS-EE 481 Spring 2005 23Founders Day, 2005 University of Portland School of Engineering MOSIS Layout

24. CS-EE 481 Spring 2005 24Founders Day, 2005 University of Portland School of Engineering MOSIS Layout Close-up

25. CS-EE 481 Spring 2005 25Founders Day, 2005 University of Portland School of Engineering Final Product

26. CS-EE 481 Spring 2005 26Founders Day, 2005 University of Portland School of Engineering MOSIS Chip Faults

27. CS-EE 481 Spring 2005 27Founders 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

28. CS-EE 481 Spring 2005 28Founders Day, 2005 University of Portland School of Engineering Demonstration Input Signal Output Signal—Shows Gain -3db point—Shows Filtering

29. CS-EE 481 Spring 2005 29Founders Day, 2005 University of Portland School of Engineering Demonstration

30. CS-EE 481 Spring 2005 30Founders Day, 2005 University of Portland School of Engineering Any Questions? Thank You!