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ELG4135 Electronics III Course Project Low Cost, Low Power Function Generator

Introduction. What are Function Generators?Function Generators can produce Square, Triangular and Sinusoidal waveforms over a wide range of frequencies and amplitudes as well as modulated waveforms (AM, FM, FSK) and signal noise. Why a Function Generator?Essential tool in Electrical Engineering

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ELG4135 Electronics III Course Project Low Cost, Low Power Function Generator

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    1. ELG4135 Electronics III Course Project Low Cost, Low Power Function Generator By Md Amirul Bhuiya Norman Escobar December 1, 2006

    2. Introduction What are Function Generators? Function Generators can produce Square, Triangular and Sinusoidal waveforms over a wide range of frequencies and amplitudes as well as modulated waveforms (AM, FM, FSK) and signal noise. Why a Function Generator? Essential tool in Electrical Engineering Can be implemented with basic inexpensive components Most circuits needed have a direct relevance to the course Project Objectives To build a low-cost Function Generator capable of: Producing Square, Triangular and Sine waveforms with amplitude control adjusting the waveform frequencies up to 1 MHz or higher Producing a Sine wave with minimal THD (ideally under 1%). The function generator should be low cost

    3. Agenda In this Presentation we will talk about: The Design Performance & Results Advantages & Disadvantages (Conclusion)

    4. Design Block Diagram Voltage Controlled Oscillator (VCO) Level Detector Sine Shaping Circuit Output stage (Variable Power Amplifier)

    5. Functional Block I Voltage Controlled Oscillator Wien Bridge Sine Oscillator Compensated Triangle Oscillator Using LM6365 Triangle Oscillator with double Detector Circuit Crystal Oscillator

    6. Functional Block I Voltage Controlled Oscillator Final VCO design

    7. Functional Block II Level Detector Wien Bridge Sine Oscillator Compensated Triangle Oscillator Using LM6365 Triangle Oscillator with double Detector Circuit Crystal Oscillator

    8. Functional Block III Sine Shaping Overdriven CA3080 Breakpoint Sine Shaper BJT non-linear amplifier

    9. Functional Block IV Amplifier Variable Inverting Amplifier with Offset Adjustment

    10. Overall Circuit

    11. Performance & Results Waveforms Produced Triangular, Square and Sinusoidal Overall Frequency Range: 4 Hz – 1.3 MHz Practical Frequency Range: Triangle: 4 Hz to 500 kHz Square: 4 Hz to 1.3 MHz & up Sine: 30 kHz to 1.3 MHz & up (independent) Sine: 30 kHz to 500 kHz (dependent)

    12. Performance & Results Duty Cycle Adjustment: 1% - 80% Amplitude Control: 0 V – 26 V p-p DC Offset Control: 0V - +/- 5 V THD of Sinewave: 0.768 % at 500 kHz, 50% D.C. 0.878 % at 10 kHz, 50% D.C. 1.155 % at 1.0 MHz, 50% D.C.

    13. Sine Shaper Frequency Response (Standalone)

    14. Sine Shaper Frequency Response (Integrated)

    15. Output Waveforms

    16. Output Waveforms (Frequency Modulated)

    17. Advantages Produces all the basic requirements of a function generator Good frequency range Good amplitude range Simple to design and build Expandable for modulation Minimal Circuit footprint Conclusion

    18. References Adel S. Sedra and Kenneth C. Smith, Microelectronics Circuits. New York: Oxford University Press, 2004. Bernie Hutchins, Electronotes. “Contrasting sinewave generation in the analog and digital cases”, http://www.synthtech.com/tutor/sine1.pdf. National Semiconductor, Appl. Note 271, pp. 9. John W. Fattaruso and Robert G. Meyer, “Triangle-to-Sine Wave Conversion with MOS Technology,” IEEE Journal of Solid-State Circuits, vol. Sc-20, No. 2, April 1985. Kim B. Östman, Sami T. Sipilä, Ivan S. Uzunov, and Nikolay T. Tchamov, “Novel VCO Architecture Using Series Above-IC FBAR and Parallel LC Resonance,” IEEE Journal of Solid-State Circuits, vol. 41, no. 10, October 2006. eCircuit Centre, “Opamp Triangle-Wave Generator,” 2005, http://www.ecircuitcenter.com/Circuits/op_tri_gen/op_tri_gen.htm National Semiconductor, Appl. Note 263, (Sine Wave GenerationTechniques).

    19. References “Triangle to Sine Conversion (Nonlinear Function Fitting),” class notes by M. H. Miller for ECE 414, College of Engineering and Computer Science, University of Michigan-Dearborn, May 2004. National Semiconductor, LM6165/LM6265/LM6365 High Speed Operational Amplifier, pp. 9, May 1999. Analog Applications Journal, Design of op amp sine wave oscillators, Texas Instruments Incorporated, August 2000. National Semiconductor, “Precise Tri-Wave Generation,” Linear Brief 23, March 1986. MX.COM Inc, Appl. Note 20830065.001.

    20. Thank You

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