Title :
ZVS operating frequency versus duty ratio of class E amplifier with nonlinear shunt capacitance
Author :
Suetsugu, Tadashi ; Kazimierczuk, Marian K.
Author_Institution :
Dept. of Electron. Eng. & Comput. Sci., Fukuoka Univ., Fukuoka
Abstract :
The maximum operating frequency of the class E amplifier with nonlinear shunt capacitance depends on the transistor duty ratio. It varies with the duty ratio under zero- voltage switching (ZVS) and zero-derivative switching (ZDS) conditions at fixed values of the output power, dc supply voltage. Therefore, the design of the class E amplifier with given values of the shunt capacitance, the output power, dc supply voltage is possible by adjusting the operating frequency. The operating frequency has the maximum value when the duty ratio DON is approximately 0.36 at VDD/Vbi = 1 . It is also shown that the maximum operating frequency is higher when the dc supply voltage VDD is lower.
Keywords :
amplifiers; switching circuits; transistors; zero voltage switching; ZVS operating frequency; class E amplifier duty ratio; dc supply voltage; maximum operating frequency; nonlinear shunt capacitance; transistor duty ratio; zero-derivative switching; Capacitance; Frequency; MOSFET circuits; Power amplifiers; Power generation; Power supplies; Radiofrequency amplifiers; Switches; Transistors; Zero voltage switching; Class E power amplifiers; RF power amplifiers; frequency limitation; nonlinear capacitance; zero-voltage-switching (ZVS) operation;
Conference_Titel :
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-1683-7
Electronic_ISBN :
978-1-4244-1684-4
DOI :
10.1109/ISCAS.2008.4542153
