1. 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 Berkeley, CA 94720 1 Department of Electrical and Computer Engineering Clemson University Clemson, SC 29634

2. CLEMSON U N I V E R S I T Y Motivation/Objectives Development and Design Fabrication of Transmitter Experimental Results Conclusion Outline

3. CLEMSON U N I V E R S I T Y 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. CLEMSON U N I V E R S I T Y Development and Design Block Diagram CircuitCAM

5. CLEMSON U N I V E R S I T Y Block Diagram

6. CLEMSON U N I V E R S I T Y Design in CircuitCAM Example layout of 5.8 GHz patch antenna Example layout of switch

7. CLEMSON U N I V E R S I T Y Fabrication of Transmitter

8. CLEMSON U N I V E R S I T Y Mixer Close-up

9. CLEMSON U N I V E R S I T Y Switch Close-up

10. CLEMSON U N I V E R S I T Y Power Amplifier Close-up

11. CLEMSON U N I V E R S I T Y Antenna Close-up

12. CLEMSON U N I V E R S I T Y Experimental Results Spectral plot of the SKY-7G mixer with IF = 100 KHz, LO = 1.9 GHz

13. CLEMSON U N I V E R S I T Y Smith Diagram for 5.8 GHz Patch Antenna

14. CLEMSON U N I V E R S I T Y Standing Wave Ratio (SWR) Plot

15. CLEMSON U N I V E R S I T Y Just Curious Transmitter with mixer and antenna alone at 5 feet

16. CLEMSON U N I V E R S I T Y 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

17. CLEMSON U N I V E R S I T Y 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

18. CLEMSON U N I V E R S I T Y Additional Slides Power Budget Transistor diagram of the switching network ADS Baseband Harmonic Problem

19. CLEMSON U N I V E R S I T Y Power Budget

20. CLEMSON U N I V E R S I T Y Transistor diagram of the switching network

21. CLEMSON U N I V E R S I T Y Design in Advanced Design System ADS Linecalc Tool Transmitter Block Diagram

22. CLEMSON U N I V E R S I T Y Baseband Harmonic Images Problem Small baseband frequencies = Spurious signals close to transmit signal!

23. CLEMSON U N I V E R S I T Y Thank You Very Much!