Weighted Polynomial Digital Predistortion for Low Memory Effect Doherty Power Amplifier

2007 ◽  
Vol 55 (5) ◽  
pp. 925-931 ◽  
Author(s):  
Sungchul Hong ◽  
Young Yun Woo ◽  
Jangheon Kim ◽  
Jeonghyeon Cha ◽  
Ildu Kim ◽  
...  
Keyword(s):  
Memory Effect ◽  
Power Amplifier ◽  
Digital Predistortion ◽  
Doherty Power Amplifier

A 2.5GHZ-2.7GHz Unsymmetrical Doherty Power Amplifier with Digital Predistortion for LTE-Advanced Applications

2013 ◽  
Vol 760-762 ◽  
pp. 546-550 ◽  
Author(s):  
Wen Sheng Pan ◽  
Chuan Hui Ma ◽  
Shi Hai Shao ◽  
You Xi Tang
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Power Efficiency ◽  
Continuous Wave ◽  
Digital Predistortion ◽  
Average Output ◽  
Lte Advanced ◽  
Saturation Power ◽  
Doherty Power Amplifier ◽  
Better Than

An unsymmetrical GaN based Doherty power amplifier (DPA) operating from 2.5GHz to 2.7GHz is presented in this paper. To achieve a good tradeoff among the output power, efficiency and bandwidth, the ladder-type multisection output matching networks are optimized for the carrier amplifier and the peaking amplifier, respectively. Measured with continuous wave (CW) signal, the broadband DPA provides more than 49dBm saturation power in the operating band. The drain efficiency is greater than 44% over 7dB back-off power. For a LTE-Advanced signal with 100MHz bandwidth, the drain efficiency is higher than 42% at an average output power of 41dBm, along with an adjacent channel leakage ratio (ACLR) of better than-49.9dBc after digital predistortion (DPD).

A wideband digital predistortion for highly linear and efficient GaN HEMT Doherty power amplifier

2009 ◽  
Vol 52 (2) ◽  
pp. 484-487 ◽  
Author(s):  
Mun-Woo Lee ◽  
Yong-Sub Lee ◽  
Sang-Ho Kam ◽  
Yoon-Ha Jeong
Keyword(s):  
Power Amplifier ◽  
Digital Predistortion ◽  
Gan Hemt ◽  
Doherty Power Amplifier

Undersampling Digital Predistortion Compensation Technology Based on Broadband Signals

2014 ◽  
Vol 543-547 ◽  
pp. 2381-2384
Author(s):  
Rui Zhang ◽  
Zhi Bin Zeng
Keyword(s):  
Memory Effect ◽  
Power Amplifier ◽  
Input Signal ◽  
Output Signal ◽  
Sampling Frequency ◽  
Digital Predistortion ◽  
Original Signal ◽  
Compensation Methods ◽  
Broadband Signal

Nonlinearity of power amplifier always results in spectrum spreading on input signal. When using digital predistortion technology to compensate power amplifier's nonlinearity, the required sampling frenquence for the output signal of amplifier is times of the original signal. The undersampling predistortion method can reduce the sampling frequency requirements. However, for the broadband signal, due to the significant memory effect of the power amplifier, the performance of undersampling digital predistortion is not satisfactory. In order to improve the undesirable predistortion performamce, this paper presents two kinds of undersampling digital predistortion compensation methods. For different sampling frequencies, the predistortion performances of these two kinds of compensation methods are different.

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