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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(4):927-934; doi:10.1093/ietfec/e91-a.4.927
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Selected Papers from the 20th Workshop on Circuits and Systems in Karuizawa -- Papers

Design of Class DE Amplifier with Nonlinear Shunt Capacitances for Any Output Q

Toru EZAWA1, Hiroo SEKIYA1 and Takashi YAHAGI1

1 The authors are with the Graduate School of Advanced Integration Science, Chiba University, Chiba-shi, 263-8522 Japan. E-mail: ezawa{at}graduate.chiba-u.jp


  Abstract

This paper investigates the design curves of the class DE amplifier with the nonlinear shunt capacitances for any output Q and any grading coefficient m of the diode junction in the MOSFET. The design curves are derived by the numerical calculation using Spice. The results of this paper have two important meanings. Firstly, it is clarified that the nonlinearities of the shunt capacitances affect the design curves of the class DE amplifier, especially, for low output Q. Moreover, the supply voltage is a quite important parameter to design the class DE amplifier with the nonlinear shunt capacitances. Secondly, it is also clarified that the numerical design tool using Spice, which is proposed by authors, can be applied to the derivation of the design curves. This shows the possibility of the algorithm to be a powerful tool for the analysis of the class E switching circuits. The waveforms from Spice simulations denote the validity of the design curves.

Key Words: class DE amplifier, class E switching, nonlinear capacitance on MOSFET, quality factor, SPICE simulations, grading coefficient

Manuscript received June 26, 2007. Manuscript revised October 6, 2007.


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