Adaptive Linearization of Frequency Doubler Using DGS

Author

Kang, Sung Min ; Nam, Sang Wook ; Koo, Kyung Heon

Author_Institution

Incheon Univ., Incheon

fYear

2007

fDate

3-8 June 2007

Firstpage

1225

Lastpage

1228

Abstract

This paper presents adaptive digital predistortion linearization for the frequency doubler of dual band transmitter designed with DGS. The proposed dual band module operates either as an power amplifier for 2.4 GHz band, or as a frequency doubler for 5.8 GHz band according to signal frequency and bias control. The linearized frequency doubler shows significant enhancement in terms of output power, ACPR and EVM. Measured result shows that the frequency doubler has more than 26 dB ACPR improvement at 11 MHz offset from center frequency by the proposed adaptive predistotion. The EVM of the frequency doubler is 4.4% with adaptive predistortion, whereas it is 15.4% with non-adaptive predistortion. The required power back-off has decreased 7 dB to meet the IEEE 802.11 a EVM requirements with 54 Mbps data rate.

Keywords

linearisation techniques; microwave frequency convertors; microwave power amplifiers; radio transmitters; wireless LAN; ACPR; EVM; IEEE 802.11a; adaptive digital predistortion linearization; bias control; bit rate 54 Mbit/s; defected ground structure; dual band transmitter; frequency 2.4 GHz; frequency 5.8 GHz; frequency doubler; power amplifier; signal frequency; Circuits; Costs; Dual band; Linearization techniques; Power amplifiers; Power generation; Predistortion; Radio frequency; Transmitters; Wireless LAN; ACPR; DGS; Frequency doubler; adaptive predistortion; error vector magnitude; wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium, 2007. IEEE/MTT-S International

Conference_Location

Honolulu, HI

ISSN

0149-645X

Print_ISBN

1-4244-0688-9

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2007.380388

Filename

4264051