Title :
Optimum component values for a lossy Class E power amplifier
Abstract :
The Class E power amplifier offers a means to increase the battery efficiency in wireless terminals. The losses can be taken into account by solving the drain waveforms for a switch having a non-zero on resistance. In this paper a new analysis formulation is presented in which the input values (P/sub OUT/, V/sub DD/ and R/sub ON/) are combined into one parameter k. Then, the efficiency and optimum component values for a lossy Class E amplifier can be solved with relatively simple calculations. The analysis reveals that there is a maximum value for switch losses that can be accepted in order to operate in the Class E mode. The results of the analysis are presented in plots providing initial component values for practical Class E power amplifier design. The validation simulation results show excellent match with the calculated values.
Keywords :
CMOS analogue integrated circuits; MMIC power amplifiers; circuit optimisation; losses; CMOS; FET; battery efficiency; drain waveforms; initial component values; input values; lossy Class E power amplifier; nonzero on resistance; optimum component values; switch losses; validation simulation; wireless terminals; Batteries; CMOS technology; Capacitors; Energy consumption; Power amplifiers; Radio frequency; Radio transmitters; Radiofrequency amplifiers; Shunt (electrical); Switches;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1210587
