DocumentCode :
1088951
Title :
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
Link To Document :
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