Title :
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.
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;
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
DOI :
10.1109/ISCAS.2006.1692851
