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Development of a Direct Conversion Multiband/Multimode Transmitter for Wireless Applications

Development of a Direct Conversion Multiband/Multimode Transmitter for Wireless Applications Morgan Chen chenmor@uclink.berkeley.edu Summer Undergraduate Research Experience (SURE) 2002 1 Department of Electrical Engineering and Computer Science University of California, Berkeley

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Development of a Direct Conversion Multiband/Multimode Transmitter for Wireless Applications

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  1. Development of a Direct Conversion Multiband/Multimode Transmitter for Wireless Applications Morgan Chen chenmor@uclink.berkeley.edu Summer Undergraduate Research Experience (SURE) 20021 Department of Electrical Engineering and Computer Science University of California, Berkeley Berkeley, CA 94720 1Department of Electrical and Computer Engineering Clemson University Clemson, SC 29634

  2. Outline • Motivation/Objectives • Development and Design • Fabrication of Transmitter • Experimental Results • Conclusion

  3. Motivation/Objectives • Direct Conversion, or homodyne, has fewer components • Fewer Components = Cheaper • Multiband transmitters allow accessing multiple frequencies • Ultimate goal of single chip design

  4. Development and Design • Block Diagram • CircuitCAM

  5. Block Diagram

  6. Design in CircuitCAM Example layout of switch Example layout of 5.8 GHz patch antenna

  7. Fabrication of Transmitter

  8. Experimental Results Spectral plot of the SKY-7G mixer with IF = 100 KHz, LO = 1.9 GHz

  9. Smith Diagram for 5.8 GHz Patch Antenna

  10. Standing Wave Ratio (SWR) Plot

  11. Just Curious Transmitter with mixer and antenna alone at 5 feet

  12. Conclusions • Direct conversion multiband/multimode transmitter technology is promising • Design may require state of the art power amplifiers • Switch is inefficient • Switch also suffers from parasitics • Future research means developing the PA and switch • Future research also requires spectral masking

  13. Acknowledgements • National Science Foundation • Minicircuits’s Gerry Edson • Agilent Technologies’ Creg Ballou • NEC's California Eastern Laboratories' David Melton and Pam Cowan • SURE advisor Dr. A. Pham • Graduate students S. Thumaty, D. Newlin, C. Tompkins, X. Wang, S. Manohar, J. Rudbeck, M. Lockhard, R. Hanks, S. Chopra, and A. Keerti • And last, but not least, Dr. D. Noneaker, Director of the SURE program at Clemson University

  14. Additional Slides • Power Budget • Transistor diagram of the switching network • ADS • Baseband Harmonic Problem

  15. Power Budget

  16. Transistor diagram of the switching network

  17. Design in Advanced Design System Transmitter Block Diagram ADS Linecalc Tool

  18. Baseband Harmonic Images Problem Small baseband frequencies = Spurious signals close to transmit signal!

  19. Thank You Very Much!

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