DocumentCode
762983
Title
Linearized mixer using predistortion technique
Author
Kim, Youngwook ; Kim, Youngsik ; Lee, Soonghak
Author_Institution
Seoul Nat. Univ., South Korea
Volume
12
Issue
6
fYear
2002
fDate
6/1/2002 12:00:00 AM
Firstpage
204
Lastpage
205
Abstract
A predistortion technique has been proposed to reduce intermodulation distortion (IMD) generated from the conversion process of a mixer. In this technique, the IMD generated from a mixer in the IF band was cancelled by the controlled RF error signal, which is generated by a predistorter. The magnitude and phase of the RF error signal were properly adjusted through a vector modulator. This linearization technique has been verified by experiment of a down conversion mixer in the cellular band. A two tone test has been performed at the frequency of 836 MHz with 442 kHz separation. The results show that this method improves about 16 dB of IMD3 at -18 dBm IF output power in 10 MHz frequency band and increases about 3.5 dB of P1 dB of the mixer. Simple topology and good performance in linearization of IF signals renders this technique suitable for highly linear frequency conversion in communication systems.
Keywords
UHF mixers; intermodulation distortion; linearisation techniques; 836 MHz; IM3; IMD reduction; communication systems; controlled RF error signal; highly linear frequency conversion; intermodulation distortion; linearization technique; linearized mixer; predistortion technique; two tone test; vector modulator; Error correction; Intermodulation distortion; Linearization techniques; Mixers; Phase modulation; Predistortion; RF signals; Radio frequency; Signal generators; Testing;
fLanguage
English
Journal_Title
Microwave and Wireless Components Letters, IEEE
Publisher
ieee
ISSN
1531-1309
Type
jour
DOI
10.1109/LMWC.2002.1009995
Filename
1009995
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