Power Control of a Switching Amplifier for GSM Handsets

Rainer Koller; Andreas Stelzer; Klemens Freudenthaler; Karl-Heinz Abt; Linus Maurer; Robert Weigel

Power Control of a Switching Amplifier for GSM Handsets

Rainer Koller (Editor), Andreas Stelzer, Klemens Freudenthaler, Karl-Heinz Abt, Linus Maurer, Robert Weigel

Institute for Communications Engineering and RF-Systems

Research output: Chapter in Book/Report/Conference proceeding › Conference proceedings › peer-review

Abstract

Maximizing the efficiency of GSM handset power amplifiers (PA) for a significant increase of talk-time is the main aim in new design approaches. One of them is the utilization of switching amplifiers, since they offer extremely high efficiency and their disadvantages are not applicable to constant-envelope modulation schemes like GMSK used in the GSM system. Among them, the Class-E amplifier concept is best suited, because it allows about 80% efficiency, while maintaining an excellent output spectrum and reasonable gain. Since the power transistor operates as a switch, the input signal envelope is not reproduced accordingly at the output. In this paper, four ways of output power control are presented and compared: Variable supply voltage by utilizing a DC/DC converter, a serial transistor and PA mixed mode operation by reducing the gate voltage swing as well as variation of the duty cycle.

Original language	English
Title of host publication	Proc. 2002 APMC
Pages	1571 - 1574
Number of pages	4
Publication status	Published - Nov 2002

Fields of science

202030 Communication engineering

Leistungsverstärker für GSM-Handys mit gesteigertem Wirkungsgrad
Koller, R. (Researcher) & Springer, A. (PI)
03.01.2000 → 31.12.2002
Project: Contract research › Industry project

Cite this

@inproceedings{f1bda9e4d39d463c911311fc829852d7,

title = "Power Control of a Switching Amplifier for GSM Handsets",

abstract = "Maximizing the efficiency of GSM handset power amplifiers (PA) for a significant increase of talk-time is the main aim in new design approaches. One of them is the utilization of switching amplifiers, since they offer extremely high efficiency and their disadvantages are not applicable to constant-envelope modulation schemes like GMSK used in the GSM system. Among them, the Class-E amplifier concept is best suited, because it allows about 80% efficiency, while maintaining an excellent output spectrum and reasonable gain. Since the power transistor operates as a switch, the input signal envelope is not reproduced accordingly at the output. In this paper, four ways of output power control are presented and compared: Variable supply voltage by utilizing a DC/DC converter, a serial transistor and PA mixed mode operation by reducing the gate voltage swing as well as variation of the duty cycle.",

author = "Rainer Koller and Andreas Stelzer and Klemens Freudenthaler and Karl-Heinz Abt and Linus Maurer and Robert Weigel",

year = "2002",

month = nov,

language = "English",

pages = "1571 -- 1574",

booktitle = "Proc. 2002 APMC",

}

TY - GEN

T1 - Power Control of a Switching Amplifier for GSM Handsets

AU - Stelzer, Andreas

AU - Freudenthaler, Klemens

AU - Abt, Karl-Heinz

AU - Maurer, Linus

AU - Weigel, Robert

A2 - Koller, Rainer

PY - 2002/11

Y1 - 2002/11

N2 - Maximizing the efficiency of GSM handset power amplifiers (PA) for a significant increase of talk-time is the main aim in new design approaches. One of them is the utilization of switching amplifiers, since they offer extremely high efficiency and their disadvantages are not applicable to constant-envelope modulation schemes like GMSK used in the GSM system. Among them, the Class-E amplifier concept is best suited, because it allows about 80% efficiency, while maintaining an excellent output spectrum and reasonable gain. Since the power transistor operates as a switch, the input signal envelope is not reproduced accordingly at the output. In this paper, four ways of output power control are presented and compared: Variable supply voltage by utilizing a DC/DC converter, a serial transistor and PA mixed mode operation by reducing the gate voltage swing as well as variation of the duty cycle.

AB - Maximizing the efficiency of GSM handset power amplifiers (PA) for a significant increase of talk-time is the main aim in new design approaches. One of them is the utilization of switching amplifiers, since they offer extremely high efficiency and their disadvantages are not applicable to constant-envelope modulation schemes like GMSK used in the GSM system. Among them, the Class-E amplifier concept is best suited, because it allows about 80% efficiency, while maintaining an excellent output spectrum and reasonable gain. Since the power transistor operates as a switch, the input signal envelope is not reproduced accordingly at the output. In this paper, four ways of output power control are presented and compared: Variable supply voltage by utilizing a DC/DC converter, a serial transistor and PA mixed mode operation by reducing the gate voltage swing as well as variation of the duty cycle.

M3 - Conference proceedings

SP - 1571

EP - 1574

BT - Proc. 2002 APMC

ER -

Power Control of a Switching Amplifier for GSM Handsets

Abstract

Fields of science

Projects

Leistungsverstärker für GSM-Handys mit gesteigertem Wirkungsgrad

Cite this