2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

IEEE Transactions on Microwave Theory and Techniques
Volume 48 Number 12, December 2000

Table of Contents for this issue

Complete paper in PDF format

Tuning Analysis for the High-Q Class-E Power Amplifier

William H. Cantrell

Page 2397.

Abstract:

The effects of component variations on a high-Q class-E amplifier are simulated and measured. Design equations are provided for the case of a 50% duty cycle with B at its optimum value for a given R. Six distinct operating points are analyzed for the output network. The problem of tuning a high-Q class-E amplifier is addressed. Normally, it cannot be tuned for maximum output power without degrading efficiency. An auxiliary circuit is added to the design so that it can be tuned for maximum output power in order to achieve optimum efficiency. Measured data are obtained at low frequencies for an amplifier with a loaded Q of 340.

References

  1. N. O. Sokal and A. D. Sokal, "Class E-A new class of high-efficiency tuned single-ended power amplifiers", IEEE J. Solid State Circuits, vol. SC-10, pp.  168-176, June  1975.
  2. F. H. Raab, "Idealized operation of the class E tuned power amplifier", IEEE Trans. Circuits Syst., vol. CAS-24, pp.  725 -735, Dec.  1977.
  3. F. H. Raab, "Effects of circuit variations on the class E tuned power amplifier", IEEE J. Solid State Circuits, vol. SC-13, pp.  239-247,  Apr.  1978.
  4. H. L. Krauss, C. W. Bostian and F. H. Raab, Solid State Radio Engineering, New York: Wiley, 1980, pp.  448-454. 
  5. F. H. Raab, "Suboptimum operation of class-E RF power amplifiers", in Proc. RF Technology Expo '89, Santa Clara, CA, Feb. 14-16 1989, pp.  85-98. 
  6. T. B. Mader and Z. B. Popovic, "The transmission-line high-efficiency class E amplifier", IEEE Microwave Guided Wave Lett., vol. 5, pp.  290-292, Sept.  1995.
  7. S. Li, "UHF and X-band class-E amplifiers", Ph.D. thesis, California Institute of Technology, 1998.
  8. W. H. Cantrell, "Circuit to aid tuning of class-E amplifier", in Proc. 2000 IEEE Int. Microwave Symp., vol. 2, Boston, MA, June 2000,WE2C-5,. pp.  787-790.