Polar SiGe Class E and F Amplifiers Using Switch-Mode Supply Modulation

Author

Kitchen, Jennifer N. ; Deligoz, Ilker ; Kiaei, Sayfe ; Bakkaloglu, Bertan

Author_Institution

Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ

Volume

55

Issue

5

fYear

2007

fDate

5/1/2007 12:00:00 AM

Firstpage

845

Lastpage

856

Abstract

Two integrated polar supply-modulated class E and F power amplifiers (PAs) in 0.18-mum SiGe BiCMOS process are presented. The amplifiers are used to transmit GSM-EDGE signals with an envelope dynamic range of 11 dB and a frequency range of 880-915 MHz. The amplifiers use switch-mode dc-dc buck converters for supply modulation, where sigma-delta (SigmaDeltaM), delta (DeltaM), and pulsewidth modulation are used to modulate the PA amplitude signal. A framework has been developed for comparing the three switching techniques for EDGE implementation. The measurement results show that DeltaM gives the highest efficiency and lowest adjacent channel power, providing class E and F PA efficiencies of 33% and 31%, respectively, at maximum EDGE output power. The corresponding class E and F linearized amplifiers´ output spectra at 400-kHz offset are -54 and -57dBc, respectively

Keywords

BiCMOS integrated circuits; DC-DC power convertors; Ge-Si alloys; cellular radio; power amplifiers; pulse width modulation; sigma-delta modulation; switched mode power supplies; 0.18 micron; 880 to 915 MHz; BiCMOS process; GSM-EDGE signals; SiGe; class E amplifier; class F amplifier; delta modulation; linearized amplifier; polar modulation; power amplifiers; pulsewidth modulation; sigma-delta modulation; switch-mode DC-DC buck converters; switch-mode supply modulation; switching amplifiers; Amplitude modulation; BiCMOS integrated circuits; Delta modulation; Dynamic range; Frequency; Germanium silicon alloys; Power amplifiers; Pulse amplifiers; Pulse modulation; Silicon germanium; EDGE; polar modulation; power amplifiers (PAs); switching amplifiers;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2007.895407

Filename

4195667