volume | PIER Journals

Abstract

A phase-alignment system is used fully integrate a power amplifier, Cartesian feedback linearization circuitry, and a phasealignment system. The phase-alignment system employs a new technique for offset-free analog multiplication that enables it to function without manual trimming. This paper demonstrates how the phase-alignment system improves the stability margins of the fully integrated Cartesian feedback system. The power amplifier itself, integrated on the same die, operates at 1 GHz and delivers a maximum of 30 dBm of output power into a 50-load. The class AB design for open loop and close loop power amplifier with Cartesian feedback, demonstrated a good linearity of 50 dBc and 80 dBc, respectively. The operating power is 2 W at 1000 MHz frequency.

1. Albert, B. R., Introduction to Satellite Communications, 3rd Ed., Artech House Inc., 2002.

2. Coskun, A. H. and S. Demir, "A mathematical characterization and analysis of a feedforward circuit for CDMA applications," IEEE Transactions on Microwave Theory and Techniques, Vol. 51, 767-777, 2003.
doi:10.1109/TMTT.2003.808582

3. Park, J. K., D. H. Shin, J. N. Lee, and H. J. Eom, "A full-wave analysis of a coaxial waveguide slot bridge using the fourier transform technique," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 2, 143-158, 2006.
doi:10.1163/156939306775777198

4. Wu, C. and G.-X. Jiang, "Stabilization procedure for the time-domain integral equation," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 11, 1507-1512, 2007.

5. Dawson, J. and T. Lee, "Automatic phase alignment for high bandwidth Cartesian feedback power amplifiers," IEEE Proceeding Radio and Wireless Conf., 71-74, 2000.

6. Makki, S. V., T. Z. Ershadi, and M. S. Abrishamian, "Determining the specific ground conductivity aided by the horizontal electric dipole antenna near the ground surface," Progress In Electromagnetics Research B, Vol. 1, 43-65, 2008.
doi:10.2528/PIERB07093003

7. Mallahzadeh, A. R., A. A. Dastranj, and H. R. Hassani, "A novel dual-polarized double-ridged horn antenna for wideband applications," Progress In Electromagnetics Research B, Vol. 1, 67-80, 2008.
doi:10.2528/PIERB07101602

8. Mohammadi, F. A. and M. C. E. Yagoub, "Electromagnetic model for microwave components of integrated circuits," Progress In Electromagnetics Research B, Vol. 1, 81-94, 2008.
doi:10.2528/PIERB07101802

9. Dawson, J. L. and T. H. Lee, "Automatic phase alignment for a fully integrated Cartesian feedback power amplifier system," IEEE Journal of Solid-State Circuits, Vol. 38, 2269-2279, 2003.
doi:10.1109/JSSC.2003.819090

10. Faulkner, M., D. Contos, and M. Briffa, "Performance of automatic phase adjustment using supply current minimization in a RF feedback lineariser," Proc. 8th IEEE Int. Symp. Personal, Indoor, and Mobile Radio Communications, 858-862, 1997.

11. Khan, S. N., J. Hu, J. Xiong, and S. He, "Circular fractal monopole antenna for low VSWR UWB applications," Progress In Electromagnetics Research Letters, Vol. 1, 19-25, 2008.
doi:10.2528/PIERL07110903

12. Han, G. and E. Sanchez-Sinencio, "CMOS transconductance multipliers: A tutorial," IEEE Trans. Circuits Syst. II, Vol. 45, 1550-1563, 1998.

13. Roy, N. and V. K. Devabhaktuni, "A new computer aided LNA design approach targeting constant noise-figure and maximum gain," PIERS Online, Vol. 3, No. 8, 1321-1325, 2007.
doi:10.2529/PIERS070416143017

14. Ma, H. and Q. Feng, "An improved design of feed-forward power amplifier," PIERS Online, Vol. 3, No. 4, 363-367, 2007.
doi:10.2529/PIERS060817033556

15. Huang, Q. and C. Menolfi, "A 200 nV offset 6:5 nV=pHz noise PSD 5.6 kHz chopper instrumentation amplifier in 1 μm digital CMOS," IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, 362-363, 2001.

16. Sebak, S., L. Zhu, V. K. Devabhaktuni, and C. Wang, "A CRLH microstrip delay line for high-speed electronic circuits," PIERS Online, Vol. 3, No. 3, 259-263, 2007.
doi:10.2529/PIERS061007235152

17. Zhao, J., J. Zhou, N. Xie, J. Zhai, and L. Zhang, "Error analysis and compensation algorithm for digital predistortion systems," PIERS Online, Vol. 2, No. 6, 702-705, 2006.
doi:10.2529/PIERS060901232412

18. Huh, J. W., I. S. Chang, and C. D. Kim, "Spectrum monitored adaptive feedforward linearization," Microwave Journal, Vol. 44, 160-166, 2001.

19. Roy, N. and V. K. Devabhaktuni, "A new computer aided LNA design approach targeting constant noise-figure and maximum gain," PIERS Proceedings in Prague, Prague, Czech Republic, August 27-30 2007.

20. Presa, J., J. Legarda, H. Solar, J. Melendev, A. Munoz, and A. G. Alonso, "An adaptive feedforward amplifier for UMTS downlink transmitters," 15th IEEE Int. Personal, Indoor and Mobile Radio Communications System, 2005.

21. Liao, S.-S., S.-Y. Yuan, H.-N. Lin, P.-T. Sun, and K.-C. Chuang, "Parallel-coupled microstrip filter using stepped-impedance and over-coupled end stages for suppression of spurious responses," PIERS 2007 in Beijing Proceedings, Beijing, China, March 26-30 2007.

22. Youngoo, Y., C. Jeonghyeon, S. Bumjee, and K. Bumman, "A microwave doherty amplifier employing envelope tracking technique for high efficiency and linearity," IEEE Microwave and Wireless Components Letters, Vol. 13, 2003.

Dr. Mandeep Singh

Dr. Anand Lokesh

Dr. Syed Idris Syed Hassan

Dr. mohd Mahmud

Dr. Mohd Fadzil Ain