The effect of D/A accuracy on the performance of digital predistortion for RF power amplifiers

Author

Wu, Shanying ; Hau, S. F Simon ; Wong, Y.M.

Author_Institution

Dept or Electron. & Inf. Eng., Hong Kong Polytech. Univ.

fYear

2006

fDate

21-24 May 2006

Abstract

Nonlinearity has long been recognized as a problem endemic in power amplifiers (PA) with a high power. Digital predistortion (DPD) is one of most effective method to solve this problem. The D/A conversion accuracy on the performance of DPD for RF PA is tested in a hardware platform. The device under test is an actual working 30W PA operating at 881.5 MHz. An in-house DPD algorithm is implemented on an Altera Stratix II EP2S60 DSP development board. As the number of bits is decreased from 14 to 10, it is found that the adjacent channel leakage ratio (ACLR) at the PA output has no noticeable degradation. Below 10 bits, the ACLR started to deteriorate significantly

Keywords

UHF power amplifiers; circuit testing; nonlinear distortion; 881.5 MHz; ACLR; Altera Stratix II DSP development board; D-A accuracy; DPD algorithm; RF power amplifiers; adjacent channel leakage ratio; digital predistortion; nonlinear distortion; Baseband; High power amplifiers; Power amplifiers; Power engineering and energy; Predistortion; RF signals; Radio frequency; Radiofrequency amplifiers; Testing; Transfer functions; D/A conversion; adjacent channel leakage ratio; digital predistortion; power amplifier;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on

Conference_Location

Island of Kos

Print_ISBN

0-7803-9389-9

Type

conf

DOI

10.1109/ISCAS.2006.1692851

Filename

1692851