Tunable integrated output impedance transformer on a power amplifier for 4G applications

Author

Jato, Yolanda ; Herrera, Alfredo ; De Astis, Gianfilippo ; Huin, Francis C.

Author_Institution

Dept. Of Commun. Eng., Univ. of Cantabria, Santander, Spain

fYear

2013

fDate

2-7 June 2013

Firstpage

1

Lastpage

4

Abstract

This paper presents the design of a modified Ruthroff-type transmission line transformer with tuning capability. The variation of a capacitor included in the structure allows the output impedance of a power amplifier to be changed in order to prevent degradation of the efficiency due to changes in the needs of the amplifier load produced by variations in the fabrication process. The impedance transformer integrated with a WCDMA power amplifier implemented in CMOS technology has been measured obtaining high efficiency, with values of 44.7 % and 43.3 % despite the load variation and an output power of 28.9 dBm and 28.7 dBm for two different chips.

Keywords

4G mobile communication; CMOS analogue integrated circuits; capacitors; circuit tuning; code division multiple access; impedance convertors; power amplifiers; transmission lines; wavelength division multiplexing; 4G applications; CMOS technology; Ruthroff-type transmission line transformer; WCDMA power amplifier; amplifier load; capacitor; fabrication process; load variation; tunable integrated output impedance transformer; tuning capability; Impedance; Power amplifiers; Power measurement; Power transformer insulation; Power transmission lines; Semiconductor device measurement; Transmission line measurements; Efficiency; power amplifier; transmission line transformer; tunable impedance transformer;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest (IMS), 2013 IEEE MTT-S International

Conference_Location

Seattle, WA

ISSN

0149-645X

Print_ISBN

978-1-4673-6177-4

Type

conf

DOI

10.1109/MWSYM.2013.6697421

Filename

6697421