A Ferroelectric-Capacitor-Based Tunable Matching Network for Quad-Band Cellular Power Amplifiers

Author

Tombak, Ali

Author_Institution

Corporate Res. & Dev., RF Micro Devices Inc, Greensboro, NC

Volume

55

Issue

2

fYear

2007

Firstpage

370

Lastpage

375

Abstract

A tunable matching network (TMN) based on ferroelectric capacitors for cellular power-amplifier applications was designed, fabricated, and tested. When the matching network is operated for GSM850/900 frequency bands, the input impedance varied from 3.44-j1.87 to 3.55-j0.02 Omega with a power gain variation of -1.35 to -1.62 dB. When the circuit is operated for digital communication system/personal communication system/wideband code division multiple access frequency bands, the input impedance varied from 4.28-j0.06 to 4.31+j0.97 Omega with a power gain variation of -2.05 to -1.79 dB. The nonlinearity of the TMN was also characterized on an on-wafer load-pull system using a 1.95-GHz test signal with CDMA2000 and high-speed downlink packet access modulation strings

Keywords

ferroelectric capacitors; integrated circuit design; integrated circuit testing; matched filters; power amplifiers; 1.95 GHz; CDMA2000; digital communication system; ferroelectric-capacitor-based tunable matching network; high-speed downlink packet access modulation strings; on-wafer load-pull system; output matching network; personal communication system; power amplifier; quad-band cellular power amplifiers; wideband code division multiple access frequency band; Capacitors; Cellular networks; Circuit testing; Digital communication; Ferroelectric materials; Frequency; Impedance; Power amplifiers; Tunable circuits and devices; Wideband; Barium–strontium–titanate (BST); ferroelectric; output matching network; paraelectric; power amplifier (PA); tunable matching network (TMN); varactor;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2006.889349

Filename

4084852